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  1.  
  2.  
  3.  
  4.        5i'
  5.  
  6.        MONTAGE:  DEBUT DE REC. 140 EN T | TE DE CETTE PAGE
  7.  
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  18.  
  19.  
  20.  
  21.  
  22.         8       Designations of  international  digital  blocks  (bidirec-
  23.        tional and unidirectional)
  24.  
  25.  
  26.  
  27.        8.1         General
  28.  
  29.  
  30.             This section refers to blocks which are part  of  the  digital
  31.        multiplex   hierarchy   and   which   are  formatted  according  to
  32.        Recommendations G.734, G.736, G.742, G.743,  G.745,  G.751,  G.752,
  33.        G.753  and G.754 [10]. All other blocks are designated according to
  34.        S 11.
  35.  
  36.             The format of the designation of digital blocks  is  shown  in
  37.        Table 6/M.140.
  38.                                  H.T. [T6.140]
  39.                                   TABLE 6/M.140
  40.  
  41.        ________________________________________________________________________________________________________________________________________________________________________________________________
  42.                           Format of designation                       Town A           /                 {
  43.         Suffix for transmission station or international exchange
  44.                                (optional)
  45.                                     }                                   -           Town B              /              {
  46.         Suffix for transmission station or international exchange
  47.                                (optional)
  48.                                     }                                            Function code    Serial number
  49.        ________________________________________________________________________________________________________________________________________________________________________________________________
  50.                                   Signs                             Characters       Slash       Letters/  digits   Hyphen   Characters   Slash   Letters/  digits   Space   Letters/  digits   Digits
  51.        ________________________________________________________________________________________________________________________________________________________________________________________________
  52.                           Number of characters                          12             1                 3            1          12         1             3            1           3-6             4
  53.        ________________________________________________________________________________________________________________________________________________________________________________________________
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  318.  
  319.  
  320.  
  321.                                                 Table 6/M.140 [T6.140], p.
  322.  
  323.  
  324.             The elements of the format are as follows:
  325.  
  326.                a)         Traffic relation
  327.  
  328.                Town A and town B, possibly with a suffix for the transmis-
  329.        sion  station  or  international  exchange,  indicate  the terminal
  330.        points of the block. For the spelling, see S 1.1. If  a  town  name
  331.        exceeds  the  maximum  length  of 12 characters, the Administration
  332.        should apply a suitable abbreviation  which  must  be  unique  (see
  333.        S 0.1). The town names are arranged in alphabetical order.
  334.  
  335.                The suffix for the transmission  station  or  international
  336.        exchange  (maximum  3 characters) is an optional field which may be
  337.        used to further identify the terminal point when there is more than
  338.        one  carrier  operating in the town. The necessity for a suffix and
  339.        its form should be decided  by  the  Administration  operating  the
  340.  
  341.  
  342.  
  343.  
  344.  
  345.  
  346.  
  347.  
  348.  
  349.        circuit in the town concerned.
  350.  
  351.                 In the case of a multiple destination undirectional block,
  352.        town B is replaced by (MU) (see S 8.4).
  353.  
  354.  
  355.                b)         Function code:
  356.  
  357.                 This code consists of  a  number  indicating  the  nominal
  358.        number of channels in the block followed by the letter N.
  359.  
  360.                For blocks in a  mixed  analogue/digital  environment,  see
  361.        S 10.1.2. (In this case 6 characters or less are required.)
  362.  
  363.                c)         Serial number
  364.  
  365.                This is a 1 to 4 digit number which counts  the  number  of
  366.        blocks with the same traffic relation and the same function code.
  367.  
  368.  
  369.        8.2         Bidirectional digital blocks
  370.  
  371.  
  372.             These blocks are designated according to the principles stated
  373.        in   S 8.1.
  374.  
  375.             Example 1:
  376.  
  377.                The fourth secondary order block between London  and  Paris
  378.        is designated:
  379.  
  380.                London-Paris 120N4.
  381.  
  382.                Example 2:
  383.  
  384.                The tenth primary order block between New York and Tokyo is
  385.        designated:
  386.  
  387.                New York-Tokyo 24N10.
  388.  
  389.  
  390.        8.3         Restoration digital blocks
  391.  
  392.  
  393.             Digital blocks set up on restoration digital  paths  or  spare
  394.        digital paths for restoration purposes will receive a serial number
  395.        from the 800 series, in descending order and starting from 899.
  396.  
  397.             Example:
  398.  
  399.                 The first fourth  order  restoration  block  between  Koe-
  400.        benhavn and Stockholm is designated:
  401.  
  402.                Koebenhavn-Stockholm 1920N899.
  403.  
  404.  
  405.        8.4         Multiple destination unidirectional digital blocks
  406.  
  407.  
  408.  
  409.  
  410.  
  411.  
  412.  
  413.  
  414.  
  415.             For these blocks the traffic relation is composed of the  name
  416.        of  the  sending  terminal  station  followed  by  a hyphen and the
  417.        letters MU (Multiple destination Unidirectional) in parentheses.
  418.  
  419.             Examples:
  420.  
  421.                 The  first  multiple  destination  unidirectional  primary
  422.        digital block from Bercenay (to, for example, London and Bruxelles)
  423.        is designated:
  424.  
  425.                Bercenay-(MU) 30N1.
  426.  
  427.                The next multiple destination unidirectional primary  digi-
  428.        tal  block  from  Bercenay (to, for example, Frankfurt and Roma) is
  429.        designated:
  430.  
  431.                Bercenay-(MU) 30N2.
  432.  
  433.                Note  - Digital blocks routed via a multi-access system may
  434.        be  provided  for exclusive use between two terminal stations only,
  435.        in which case the normal designations given above in this Recommen-
  436.        dation will apply.
  437.  
  438.  
  439.        8.5         Single destination unidirectional digital blocks
  440.  
  441.  
  442.             These blocks are designated as normal digital blocks and  num-
  443.        bered  in the same sequence. The unidirectional property as well as
  444.        the direction of transmission  has  to  be  registered  in  Related
  445.        Information under item 16 (Direction of transmission, see S 12.16).
  446.  
  447.             Example:
  448.  
  449.                A unidirectional primary digital block transmitting in  the
  450.        direction  Roma  to London, which is the 21st primary digital block
  451.        on that relation is designated:
  452.  
  453.                London-Roma 30N21.
  454.  
  455.  
  456.        8.6         Related information
  457.  
  458.  
  459.             The additional information on digital blocks is covered by the
  460.        following items:
  461.  
  462.                1.          Urgency for restoration;
  463.  
  464.                2.          Terminal countries;
  465.  
  466.                3.           Administrations',  carriers'  or  broadcasting
  467.        companies' names;
  468.  
  469.  
  470.                4.          Control and sub-control station(s);
  471.  
  472.  
  473.  
  474.  
  475.  
  476.  
  477.  
  478.  
  479.  
  480.  
  481.                5.          Fault report points;
  482.  
  483.                6.          Routing:
  484.  
  485.                7.          Association;
  486.  
  487.                8.          Equipment information;
  488.  
  489.                9.          Use;
  490.  
  491.                10.          Transmission medium information;
  492.  
  493.                11.          (Empty item, use: "-;");
  494.  
  495.                12.          Bit rate;
  496.  
  497.                13.          Occupancy;
  498.  
  499.                14.          Actual number of channels (for primary  blocks
  500.        only);
  501.  
  502.                15.          Clocking information;
  503.  
  504.                16.          Direction of transmission (for  unidirectional
  505.        blocks only);
  506.  
  507.             The various items will be dealt with in S 12.
  508.  
  509.  
  510.        9       Designation of international digital paths
  511.  
  512.  
  513.             In practice it may be that terminal equipment is not connected
  514.        to a digital path. Nevertheless, for designation purposes the digi-
  515.        tal path will be designated as though digital blocks had  been  set
  516.        up (see S 8.1).
  517.  
  518.  
  519.        9.1         Conventional digital paths not connected to their  ter-
  520.        minal equipment
  521.  
  522.  
  523.             Such digital paths are included in the normal serial numbering
  524.        sequence  of  digital blocks and are not given a separate numbering
  525.        sequence.
  526.  
  527.  
  528.        9.2         Restoration digital paths
  529.  
  530.  
  531.             Digital paths nominated for restoration  purposes  are  desig-
  532.        nated  by  serial  numbers  taken  from the 800 series in ascending
  533.        order and starting from 801.
  534.  
  535.                Restoration paths for first order digital  blocks:  30N801,
  536.        30N802, etc.
  537.  
  538.  
  539.  
  540.  
  541.  
  542.  
  543.  
  544.  
  545.  
  546.  
  547.                Restoration paths for second order digital blocks: 120N801,
  548.        120N802, etc.
  549.  
  550.                Example 1:
  551.  
  552.                The 4th second order restoration digital path between  Lon-
  553.        don and Paris is designated:
  554.  
  555.                London-Paris 120N804.
  556.  
  557.                Example 2:
  558.  
  559.                The first third  order  restoration  digital  path  between
  560.        Amsterdam and Paris is designated:
  561.  
  562.                Amsterdam-Paris 480N801.
  563.  
  564.  
  565.        9.3         Digital line sections and digital radio sections
  566.  
  567.  
  568.             Designations of digital line sections and digital  radio  sec-
  569.        tions are under consideration.
  570.  
  571.  
  572.        9.4         Related Information
  573.  
  574.  
  575.             The additional information on digital paths is covered by  the
  576.        following items:
  577.  
  578.                1.          Urgency for restoration;
  579.  
  580.                2.          Terminal countries;
  581.  
  582.                3.           Administrations',  carriers'  or  broadcasting
  583.        companies' names;
  584.  
  585.                4.          Control and sub-control station(s);
  586.  
  587.                5.          Fault report points;
  588.  
  589.                6.          Routing;
  590.  
  591.                7.          Association;
  592.  
  593.                8.          Equipment information;
  594.  
  595.  
  596.                9.          Use;
  597.  
  598.                10.          Transmission medium information;
  599.  
  600.                11.          (Empty item, use: "-;");
  601.  
  602.                12.          Bit rate;
  603.  
  604.  
  605.  
  606.  
  607.  
  608.  
  609.  
  610.  
  611.  
  612.  
  613.             The various items will be dealt with in S 12.
  614.  
  615.  
  616.        10       Designations  of  routes  in  the  mixed  analogue/digital
  617.        transmission network
  618.  
  619.  
  620.             Conforming to the philosophy for lining-up and  maintaining  a
  621.        mixed  analogue/digital transmission network (Recommendation M.20),
  622.        the analogue and  digital  parts  of  the  network  are  designated
  623.        separately.  To indicate that the end-to-end transmission relies on
  624.        a  mixture  of  analogue  and  digital  transmission  systems,  the
  625.        letter C is included in both the analogue and digital designations.
  626.        The funcion code may, therefore, consist of a maximum of  6 charac-
  627.        ters.
  628.  
  629.             Transmultiplexer equipment is included in the  designation  of
  630.        the analogue part of the route.
  631.  
  632.  
  633.        10.1          Transmission  routes  with  one   analogue-to-digital
  634.        conversion
  635.  
  636.  
  637.  
  638.        10.1.1         Groups and supergroups,  etc.,  forming  part  of  a
  639.        mixed analogue/digital transmission route
  640.  
  641.  
  642.             Groups, supergroups, etc., which are  converted  into  digital
  643.        paths  at some point are designated in the same way as conventional
  644.        groups or supergroups (see S 5.1), but have a letter C included  in
  645.        the function code and placed after the nominal number of channels.
  646.  
  647.             Examples:
  648.  
  649.                Group:         London-Riyadh 12C02
  650.  
  651.        Amsterdam-Koebenhavn 12C899
  652.  
  653.        (restoration group)
  654.  
  655.                Supergroup:         Paris-Sydney 60C01
  656.  
  657.                Mastergroup:         Bruxelles-London 300C03
  658.  
  659.                Supermastergroup:         Amsterdam-Paris 900C04
  660.  
  661.             Figure 2/M.140 shows a  typical  analogue/digital  arrangement
  662.        and how it will be designated.
  663.        _________________________
  664.        This term is used  provisionally  in  this  context  to
  665.        designate  various combinations of analogue and digital
  666.        sections with appropriate  intermediate  equipment  and
  667.        usually  also  including  terminal equipment, as illus-
  668.        trated in Figure 2/M.140 and Figure 3/M.140.
  669.  
  670.  
  671.  
  672.  
  673.  
  674.  
  675.  
  676.  
  677.  
  678.  
  679.        10.1.2         Digital blocks and paths forming  part  of  a  mixed
  680.        analogue/digital transmission route
  681.  
  682.  
  683.             Digital blocks and paths which  are  converted  into  analogue
  684.        groups,  supergroups,   etc.,  at  some point are designated in the
  685.        same way as conventional digital blocks  and  paths,  but  have  an
  686.        additional letter C placed after the letter N.
  687.  
  688.             Example:
  689.  
  690.                Madrid-Rome 480NC1.
  691.  
  692.             Figure 2/M.140 shows a  typical  analogue/digital  arrangement
  693.        and how it will be designated.
  694.  
  695.  
  696.        10.1.3         End-to-end designations
  697.  
  698.  
  699.             This subject is covered by item 11 in Related Information  for
  700.        digital blocks (see S 12.11).
  701.  
  702.  
  703.        10.2          Transmission  routes  with  two   analogue-to-digital
  704.        conversions
  705.  
  706.  
  707.  
  708.        10.2.1         End-to-end designations
  709.  
  710.  
  711.             Where both ends of a route involving  two  analogue-to-digital
  712.        conversions  are  analogue,  an  end-to-end  designation  using the
  713.        analogue notation described in S 10.1.1 should  be  agreed  between
  714.        the terminal Administrations.
  715.  
  716.  
  717.             Where both ends are digital, an end-to-end  designation  using
  718.        the digital notation described in S 10.1.2 should be agreed between
  719.        the terminal Administrations.
  720.  
  721.             By the above means, both terminal stations  have  available  a
  722.        common  designation  for the end-to-end transmission route, and are
  723.        informed of its mixed analogue/digital nature.
  724.  
  725.  
  726.        10.2.2         Intermediate section designation
  727.  
  728.  
  729.             The intermediate part of the route is given a separate  desig-
  730.        nation  using the appropriate notation. The choice of this designa-
  731.        tion is the responsibility of  the  Administrations  providing  the
  732.        intermediate  part  of the route, and it is their responsibility to
  733.        associate, in their records, this intermediate designation with the
  734.        overall designation.
  735.  
  736.  
  737.  
  738.  
  739.  
  740.  
  741.  
  742.  
  743.  
  744.  
  745.             Figure 3/M.140 shows two  examples  of  routes  involving  two
  746.        analogue-to-digital conversions and how they will be designated.
  747.  
  748.  
  749.                                                       Figure 2/M.140, p. 2
  750.  
  751.  
  752.  
  753.  
  754.  
  755.                                                       Figure 3/M.140, p. 3
  756.  
  757.  
  758.  
  759.        10.3           Transmission   routes    with    more    than    two
  760.        analogue-to-digital conversions
  761.  
  762.  
  763.             The transmission planning rules given in Recommendation G.113,
  764.        S 3 [11]  effectively  restrict  the number of unintegrated digital
  765.        processes (e.g. analogue-to-digital conversions) permitted  in  the
  766.        international  part of a telephone connection. Similarly, the rout-
  767.        ing plan given in Recommendation E.171 [12] restricts the number of
  768.        international circuits in a connection to four.
  769.  
  770.             In view of these rules it is desirable to limit the number  of
  771.        analogue-to-digital  conversions in each direction between interna-
  772.        tional centres to a maximum of two. Therefore the detailed designa-
  773.        tion  requirements of routes with more than two analogue-to-digital
  774.        conversions are not considered.
  775.  
  776.  
  777.        10.4         Related Information
  778.  
  779.  
  780.             The additional information on groups and blocks in  the  mixed
  781.        analogue/digital  network  is covered by the same items as analogue
  782.        groups  and  digital  blocks  respectively.  However  the  item 11,
  783.        "End-to-end   information"   is   used  in  addition  (see  SS 7.11
  784.        and 12.11).
  785.  
  786.  
  787.  
  788.        11      Designation of data transmission systems
  789.  
  790.  
  791.  
  792.        11.1         General
  793.  
  794.  
  795.             This section deals with  data  transmission  systems  provided
  796.        between  the  premises  of Administrations. (Those between renters'
  797.        premises are designated according to  S 3.2.15  concerning  digital
  798.        leased circuits connecting two locations.)
  799.  
  800.             The designation scheme of these data transmission systems  can
  801.        only  be  used  if  they  are  non-hierarchical  or  not  formatted
  802.  
  803.  
  804.  
  805.  
  806.  
  807.  
  808.  
  809.  
  810.  
  811.        according to the Recommendations G.734, G.736, G.742, G.743, G.745,
  812.        G.751,  G.752, G.753 and G.754 [10]. This means that digital blocks
  813.        from a digital  multiplex  hierarchy,  with  a  format  defined  in
  814.        Rec. G.702 [13]  cannot have a designation taken from this section.
  815.        They should be designated according to S 8.
  816.  
  817.             Note  - This section deals  with  digital  transmission  only.
  818.        Analogue  data  transmission  systems  and links are covered by the
  819.        sections treating circuits, groups and group links.
  820.  
  821.             The format of designations of data  transmission  systems  are
  822.        shown in Table  7/M.140.
  823.                                  H.T. [T7.140]
  824.                                   TABLE 7/M.140
  825.  
  826.        ________________________________________________________________________________________________________________________________________________________________________________________________
  827.                           Format of designation                       Town A           /                 {
  828.         Suffix for transmission station or international exchange
  829.                                (optional)
  830.                                     }                                   -           Town B              /              {
  831.         Suffix for transmission station or international exchange
  832.                                (optional)
  833.                                     }                                            Function code    Serial number
  834.        ________________________________________________________________________________________________________________________________________________________________________________________________
  835.                                   Signs                             Characters       Slash       Letters/  digits   Hyphen   Characters   Slash   Letters/  digits   Space   Letters/  digits   Digits
  836.        ________________________________________________________________________________________________________________________________________________________________________________________________
  837.                           Number of characters                          12             1                 3            1          12         1             3            1             5           1-3
  838.        ________________________________________________________________________________________________________________________________________________________________________________________________
  839.  
  840.       |
  841.       |
  842.       |
  843.       |
  844.       |
  845.       |
  846.       |
  847.       |
  848.       |
  849.       |
  850.       |
  851.       |
  852.  
  853.  
  854.  
  855.  
  856.  
  857.  
  858.  
  859.  
  860.  
  861.  
  862.                                                                  |
  863.                                                                  |
  864.                                                                  |
  865.                                                                  |
  866.                                                                  |
  867.                                                                  |
  868.                                                                  |
  869.                                                                  |
  870.                                                                  |
  871.                                                                  |
  872.                                                                  |
  873.                                                                  |
  874.  
  875.  
  876.  
  877.  
  878.  
  879.  
  880.  
  881.  
  882.  
  883.  
  884.                                                                               |
  885.                                                                               |
  886.                                                                               |
  887.                                                                               |
  888.                                                                               |
  889.                                                                               |
  890.                                                                               |
  891.                                                                               |
  892.                                                                               |
  893.                                                                               |
  894.                                                                               |
  895.                                                                               |
  896.  
  897.  
  898.  
  899.  
  900.  
  901.  
  902.  
  903.  
  904.  
  905.  
  906.                                                                                               |
  907.                                                                                               |
  908.                                                                                               |
  909.                                                                                               |
  910.                                                                                               |
  911.                                                                                               |
  912.                                                                                               |
  913.                                                                                               |
  914.                                                                                               |
  915.                                                                                               |
  916.                                                                                               |
  917.                                                                                               |
  918.  
  919.  
  920.  
  921.  
  922.  
  923.  
  924.  
  925.  
  926.  
  927.  
  928.                                                                                                                  |
  929.                                                                                                                  |
  930.                                                                                                                  |
  931.                                                                                                                  |
  932.                                                                                                                  |
  933.                                                                                                                  |
  934.                                                                                                                  |
  935.                                                                                                                  |
  936.                                                                                                                  |
  937.                                                                                                                  |
  938.                                                                                                                  |
  939.                                                                                                                  |
  940.  
  941.  
  942.  
  943.  
  944.  
  945.  
  946.  
  947.  
  948.  
  949.  
  950.                                                                                                                           |
  951.                                                                                                                           |
  952.                                                                                                                           |
  953.                                                                                                                           |
  954.                                                                                                                           |
  955.                                                                                                                           |
  956.                                                                                                                           |
  957.                                                                                                                           |
  958.                                                                                                                           |
  959.                                                                                                                           |
  960.                                                                                                                           |
  961.                                                                                                                           |
  962.  
  963.  
  964.  
  965.  
  966.  
  967.  
  968.  
  969.  
  970.  
  971.  
  972.                                                                                                                                        |
  973.                                                                                                                                        |
  974.                                                                                                                                        |
  975.                                                                                                                                        |
  976.                                                                                                                                        |
  977.                                                                                                                                        |
  978.                                                                                                                                        |
  979.                                                                                                                                        |
  980.                                                                                                                                        |
  981.                                                                                                                                        |
  982.                                                                                                                                        |
  983.                                                                                                                                        |
  984.  
  985.  
  986.  
  987.  
  988.  
  989.  
  990.  
  991.  
  992.  
  993.  
  994.                                                                                                                                                |
  995.                                                                                                                                                |
  996.                                                                                                                                                |
  997.                                                                                                                                                |
  998.                                                                                                                                                |
  999.                                                                                                                                                |
  1000.                                                                                                                                                |
  1001.                                                                                                                                                |
  1002.                                                                                                                                                |
  1003.                                                                                                                                                |
  1004.                                                                                                                                                |
  1005.                                                                                                                                                |
  1006.  
  1007.  
  1008.  
  1009.  
  1010.  
  1011.  
  1012.  
  1013.  
  1014.  
  1015.  
  1016.                                                                                                                                                                   |
  1017.                                                                                                                                                                   |
  1018.                                                                                                                                                                   |
  1019.                                                                                                                                                                   |
  1020.                                                                                                                                                                   |
  1021.                                                                                                                                                                   |
  1022.                                                                                                                                                                   |
  1023.                                                                                                                                                                   |
  1024.                                                                                                                                                                   |
  1025.                                                                                                                                                                   |
  1026.                                                                                                                                                                   |
  1027.                                                                                                                                                                   |
  1028.  
  1029.  
  1030.  
  1031.  
  1032.  
  1033.  
  1034.  
  1035.  
  1036.  
  1037.  
  1038.                                                                                                                                                                           |
  1039.                                                                                                                                                                           |
  1040.                                                                                                                                                                           |
  1041.                                                                                                                                                                           |
  1042.                                                                                                                                                                           |
  1043.                                                                                                                                                                           |
  1044.                                                                                                                                                                           |
  1045.                                                                                                                                                                           |
  1046.                                                                                                                                                                           |
  1047.                                                                                                                                                                           |
  1048.                                                                                                                                                                           |
  1049.                                                                                                                                                                           |
  1050.  
  1051.  
  1052.  
  1053.  
  1054.  
  1055.  
  1056.  
  1057.  
  1058.  
  1059.  
  1060.                                                                                                                                                                                              |
  1061.                                                                                                                                                                                              |
  1062.                                                                                                                                                                                              |
  1063.                                                                                                                                                                                              |
  1064.                                                                                                                                                                                              |
  1065.                                                                                                                                                                                              |
  1066.                                                                                                                                                                                              |
  1067.                                                                                                                                                                                              |
  1068.                                                                                                                                                                                              |
  1069.                                                                                                                                                                                              |
  1070.                                                                                                                                                                                              |
  1071.                                                                                                                                                                                              |
  1072.  
  1073.  
  1074.  
  1075.  
  1076.  
  1077.  
  1078.  
  1079.  
  1080.  
  1081.  
  1082.                                                                                                                                                                                                       |
  1083.                                                                                                                                                                                                       |
  1084.                                                                                                                                                                                                       |
  1085.                                                                                                                                                                                                       |
  1086.                                                                                                                                                                                                       |
  1087.                                                                                                                                                                                                       |
  1088.                                                                                                                                                                                                       |
  1089.                                                                                                                                                                                                       |
  1090.                                                                                                                                                                                                       |
  1091.                                                                                                                                                                                                       |
  1092.                                                                                                                                                                                                       |
  1093.                                                                                                                                                                                                       |
  1094.  
  1095.  
  1096.  
  1097.  
  1098.  
  1099.  
  1100.  
  1101.  
  1102.  
  1103.  
  1104.  
  1105.  
  1106.                                                 Table 7/M.140 [T7.140], p.
  1107.  
  1108.  
  1109.             The elements of the format are as follows:
  1110.  
  1111.                a)         Traffic relation
  1112.  
  1113.                Town A and town B, possibly with a transmission station  or
  1114.        international  exchange suffix, represent the two terminal stations
  1115.        of the data transmission system. The names are arranged  in  alpha-
  1116.        betical order. For the spelling see S 1.1. If the town name exceeds
  1117.        the maximum length of 12 characters, the responsible Administration
  1118.        should  supply  a  suitable  abbreviation which must be unique (see
  1119.        S 0.1).
  1120.  
  1121.                The transmission station or international  exchange  suffix
  1122.        (maximum  3 characters)  is  an optional field which may be used to
  1123.        further identify the terminal point when there  is  more  than  one
  1124.        carrier  operating  in the town. The necessity for a suffix and its
  1125.        form should be decided by the Administration operating the  circuit
  1126.        in the town concerned.
  1127.  
  1128.                b)         Function code
  1129.  
  1130.                 This code consists  of  a  2  to  4  digits  number  which
  1131.        together with a letter showing the multiplication factor, indicates
  1132.        the bit rate.
  1133.  
  1134.  
  1135.  
  1136.  
  1137.  
  1138.  
  1139.  
  1140.  
  1141.  
  1142.  
  1143.                The letters to be used to indicate the multiplication  fac-
  1144.        tor are:
  1145.  
  1146.                Bit rate of system         Letter
  1147.  
  1148.                Up to 999 bit/s         B
  1149.  
  1150.                     1 000 to 9 999 bit/s         H
  1151.  
  1152.                    10 000 to 9 999 999 bit/s         K
  1153.  
  1154.                10 000 000 to 9 999 999 999 bit/s         M
  1155.  
  1156.  
  1157.                c)         Serial number:
  1158.  
  1159.                This is a 1 to 3 digit number counting the number  of  data
  1160.        transmission  systems  with  the same traffic relation and the same
  1161.        function code.
  1162.  
  1163.                Note  - The use of the data transmission system (e.g.  mul-
  1164.        tiplex  of  digital  leased  circuits, broadcasting, video) will be
  1165.        recorded in Related Information under item 9 (Use, see S 12.9.).
  1166.  
  1167.                Example 1:
  1168.  
  1169.                The first 9600 bit/s data transmission system between  Lis-
  1170.        boa  and New York (for example in use for a multiplex of 2400 bit/s
  1171.        and 7200 bit/s circuits):
  1172.  
  1173.                Lisboa-New York 96H1.
  1174.  
  1175.                Example 2:
  1176.  
  1177.                The eleventh 2048 kbit/s data transmission  system  between
  1178.        London and Paris (used, for example, for public video conference):
  1179.  
  1180.                London-Paris 2048K11.
  1181.  
  1182.  
  1183.        11.2         Data transmission links
  1184.  
  1185.  
  1186.             Data transmission links are designated  as  data  transmission
  1187.        systems.
  1188.  
  1189.  
  1190.        11.3         Related Information
  1191.  
  1192.  
  1193.             The additional information on  data  transmission  systems  is
  1194.        covered by the following items:
  1195.  
  1196.                1.          Urgency for restoration;
  1197.  
  1198.                2.          Terminal countries;
  1199.  
  1200.  
  1201.  
  1202.  
  1203.  
  1204.  
  1205.  
  1206.  
  1207.  
  1208.  
  1209.                3.           Administrations',  carriers'  or  broadcasting
  1210.        companies' names;
  1211.  
  1212.                4.          Control and sub-control station(s);
  1213.  
  1214.                5.          Fault report points;
  1215.  
  1216.                6.          Routing;
  1217.  
  1218.                7.          Association;
  1219.  
  1220.                8.          Equipment information;
  1221.  
  1222.                9.          Use;
  1223.  
  1224.                10.          Transmission medium information;
  1225.  
  1226.                11.          Composition of transmission;
  1227.  
  1228.                12.          (Empty item, use: "-;");
  1229.  
  1230.                13.          Occupancy;
  1231.  
  1232.             The various items will be dealt with in S 12.
  1233.  
  1234.  
  1235.        12      Related information for international digital blocks, paths
  1236.        and data transmission systems
  1237.  
  1238.  
  1239.             The following sections explain the items of  Related  Informa-
  1240.        tion  concerned  with  international digital blocks, paths and data
  1241.        transmission systems. Full examples for the designation information
  1242.        of  an  international  digital block, an international digital path
  1243.        and an international data transmission system are given in Annex A,
  1244.        S A.4.
  1245.  
  1246.  
  1247.        12.1         Urgency for restoration (item 1)
  1248.  
  1249.  
  1250.             This item supplies information on the urgency  of  restoration
  1251.        of the block, path, etc. based upon bilateral agreement between the
  1252.        terminal Administrations.
  1253.  
  1254.             Format:
  1255.  
  1256.                1.          xx . |  |  |  xx; (maximum 10 characters)
  1257.  
  1258.                Illustration:
  1259.  
  1260.                a)         If the priority is top: 1;
  1261.  
  1262.        If the priority is second: 2;
  1263.  
  1264.        If the priority is third: 3; or
  1265.  
  1266.  
  1267.  
  1268.  
  1269.  
  1270.  
  1271.  
  1272.  
  1273.  
  1274.  
  1275.                b)         If repair is  required  within  e.g.  24  hours:
  1276.         24 h; or
  1277.  
  1278.                c)         If no urgency has to be indicated: -;
  1279.  
  1280.                Example:
  1281.  
  1282.                If a block needs top priority in the case of restoration:
  1283.  
  1284.                1. 1;
  1285.  
  1286.  
  1287.        12.2         Terminal countries (item 2)
  1288.  
  1289.  
  1290.             This item presents the countries in which the block,  path  or
  1291.        data transmission system is terminating.
  1292.  
  1293.             Format:
  1294.  
  1295.                2.          XXX, YYY; (3 characters for each) or 2. XXX;
  1296.  
  1297.                Specification:
  1298.  
  1299.                XXX:         code for country of town A
  1300.  
  1301.                YYY:         code for country of town B
  1302.  
  1303.                In the case of multiple destination  unidirectional  block,
  1304.        only XXX applies.
  1305.  
  1306.                Note  - The codes are according to ISO Standard 3166 [2].
  1307.  
  1308.                Example:
  1309.  
  1310.                For a digital block Bruxelles-Frankfurt 120N1:
  1311.  
  1312.                2.          BEL, DEU;
  1313.  
  1314.  
  1315.        12.3         Names of Administration, carriers or broadcasting com-
  1316.        panies (item 3)
  1317.  
  1318.  
  1319.             This item  records  the  names  of  the  carriers, etc.  which
  1320.        operate the block, path, etc.
  1321.  
  1322.             Format:
  1323.  
  1324.                3.          XXXXXX, YYYYYY; (maximum 6 characters for each)
  1325.        ou 3. XXXXXX;
  1326.  
  1327.                Specification:
  1328.  
  1329.                XXXXXX:         name of company in town A
  1330.  
  1331.                YYYYYY:         name of company in town B
  1332.  
  1333.  
  1334.  
  1335.  
  1336.  
  1337.  
  1338.  
  1339.  
  1340.  
  1341.                In the case of a multiple destination unidirectional block,
  1342.        only XXXXXX applies.
  1343.  
  1344.                Example:
  1345.  
  1346.                 For a digital  block  Frankfurt-London  30N1  operated  by
  1347.        British Telecom International and Deutsche Bundespost:
  1348.  
  1349.                3.          DBP, BTI;
  1350.  
  1351.  
  1352.        12.4         Control station (sub-control station(s)) (item 4)
  1353.  
  1354.  
  1355.             This item lists the appointed control station and  sub-control
  1356.        stations  (according to Recs. M.80 and M.90). Further details about
  1357.        the  stations  can  be  found  in  the  list  of   contact   points
  1358.        (Rec. M.93).
  1359.  
  1360.             Format:
  1361.  
  1362.                4.          CS:         designation of control station,
  1363.  
  1364.                SCS1:         designation of sub-control station,
  1365.  
  1366.                SCS2:         designation of sub-control station,
  1367.  
  1368.                 .      .    .    .    .
  1369.  
  1370.         .      .    .    .    .
  1371.  
  1372.         .      .    .    .    .
  1373.  
  1374.                SCSn:         designation of sub-control station,
  1375.  
  1376.                or, in the case of a  multiple  destination  unidirectional
  1377.        block:
  1378.  
  1379.                4.          CS:         designation of control station.
  1380.  
  1381.                Specification:
  1382.  
  1383.                CS:         designation of the control station,
  1384.  
  1385.                SCS1:         designation of the terminal sub-control  sta-
  1386.        tion,
  1387.  
  1388.                SCS2 to SCSn:         if applicable: other sub-control sta-
  1389.        tions,  are to be placed in the geographical order according to the
  1390.        traffic relation.
  1391.  
  1392.                In the case of a multiple destination unidirectional block,
  1393.        only CS applies.
  1394.  
  1395.  
  1396.                Example 1:
  1397.  
  1398.  
  1399.  
  1400.  
  1401.  
  1402.  
  1403.  
  1404.  
  1405.  
  1406.  
  1407.                For the digital block Stockholm-Venezia 30N1  with  control
  1408.        station Stockholm and sub-control stations Venezia and Paris:
  1409.  
  1410.                4.          CS:         Stockholm/HAM;
  1411.  
  1412.                SCS1:         Venezia/CEN;
  1413.  
  1414.                SCS2:         Paris/ARC;
  1415.  
  1416.                Example 2:
  1417.  
  1418.                For the digital block Rio de Janeiro-(MU) 30N1:
  1419.  
  1420.                4.          CS:         Rio de Janei/1;
  1421.  
  1422.  
  1423.        12.5         Fault report points (item 5)
  1424.  
  1425.  
  1426.             This item presents the names of both fault  report  points  on
  1427.        the  block,  path, etc.  (according to Rec. M.130). Further details
  1428.        about the fault report points can be found in the list  of  contact
  1429.        points (Rec. M.93).
  1430.  
  1431.             Format:
  1432.  
  1433.                5.          Designation of fault report point,  Designation
  1434.        of fault report point;
  1435.  
  1436.                or
  1437.  
  1438.                5.          Designation of fault report point;
  1439.  
  1440.                Specification:
  1441.  
  1442.                The first fault report point  is  the  one  of  country  of
  1443.        town A.
  1444.  
  1445.                The second fault report point is  the  one  of  country  of
  1446.        town B.
  1447.  
  1448.                 In the  case  of  a  multiple  destination  unidirectional
  1449.        block, the second station and the comma are omitted.
  1450.  
  1451.                Example 1:
  1452.  
  1453.                For the digital block Lisboa-Zuerich 30N1:
  1454.  
  1455.                5.          Lisboa/MAR, Zuerich/SEL;
  1456.  
  1457.                Example 2:
  1458.  
  1459.                For the digital block Jakarta-(MU) 30N1:
  1460.  
  1461.                5.          Jakarta/1;
  1462.  
  1463.  
  1464.  
  1465.  
  1466.  
  1467.  
  1468.  
  1469.  
  1470.  
  1471.  
  1472.  
  1473.        12.6         Routing (item 6)
  1474.  
  1475.  
  1476.             This item records the next higher block within  the  multiplex
  1477.        hierarchy  on  which  the block path, data transmission system, has
  1478.        been routed and the position number, or in the case of the  highest
  1479.        multiplex level, the transmission media on which the block has been
  1480.        routed.
  1481.  
  1482.             Format:
  1483.  
  1484.                6.          Designation of an international  block/position
  1485.        number  or  designation  of  transmission medium, Designation of an
  1486.        international block/position number or designation of  transmission
  1487.        medium, .  |   |  ,  Designation of an international block/position
  1488.        number or designation of transmission medium;
  1489.  
  1490.                Note  - Two consecutive unidirectional blocks are separated
  1491.        by a + sign instead of a comma.
  1492.  
  1493.                Specification:
  1494.  
  1495.                The designation of an international  block  refers  to  the
  1496.        next  higher level in the digital multiplex hierarchy. If there are
  1497.        more than one, the blocks are  noted  in  geographical  order  from
  1498.        town A to town B.
  1499.  
  1500.                The designation of the transmission medium  refers  to  the
  1501.        transmission  medium  leaving  the  country  of  town A  and to the
  1502.        transmission medium entering the country of town B respectively.
  1503.  
  1504.                As no CCITT designations of transmission media, nor digital
  1505.        line  or radio sections are provided for the time being, the termi-
  1506.        nal countries should provide designations or agree on designations.
  1507.  
  1508.                If there is only one transmission medium,  the  designation
  1509.        of this medium applies.
  1510.  
  1511.                Example 1:
  1512.  
  1513.                For the primary digital block Frankfurt-Zuerich 30N7:
  1514.  
  1515.                6.          Frankfurt-Zuerich 120N1/3;
  1516.  
  1517.  
  1518.                Example 2:
  1519.  
  1520.                For the block Bruxelles-London  1920N1,  with  transmission
  1521.        medium corresponding to submarine cable:
  1522.  
  1523.                6.          UK-B 5;
  1524.  
  1525.  
  1526.        12.7         Association (item 7)
  1527.  
  1528.  
  1529.             This item identifies  whether  there  are  associated  blocks,
  1530.  
  1531.  
  1532.  
  1533.  
  1534.  
  1535.  
  1536.  
  1537.  
  1538.  
  1539.        paths, data transmission systems and if so, of which nature.
  1540.  
  1541.             Format:
  1542.  
  1543.                7.          Association code: designation(s) of the associ-
  1544.        ated block(s), path(s);
  1545.  
  1546.                Specification:
  1547.  
  1548.                If the block has  | a reserve block  the  association  code
  1549.        is:  S followed  by  the function code and the serial number of the
  1550.        principal block.
  1551.  
  1552.                If the block is  | a reserve block:  the  association  code
  1553.        is:  function  code  followed  by S  and  the  serial number of the
  1554.        reserve block.
  1555.  
  1556.                The same applies for digital paths  and  data  transmission
  1557.        systems.
  1558.  
  1559.                Example:
  1560.  
  1561.                 If the path Hongkong-Singapore 30N801 is  the  restoration
  1562.        path  for  the  normal  block  Hongkong-Singapore 30N3, the Related
  1563.        Information for the normal block under Association must show:
  1564.  
  1565.                7.          S30N3: Hongkong-Singapore 30N801;
  1566.  
  1567.  
  1568.        12.8         Equipment informations (item 8)
  1569.  
  1570.  
  1571.        12.8.1  This item records information on equipment  in  the  block,
  1572.        path, etc.  which requires special maintenance attention.
  1573.  
  1574.                Format:
  1575.  
  1576.                8.          XX, XX, XX, XX;
  1577.  
  1578.                Specification:
  1579.  
  1580.                If the block has been routed via TDMA: TD.
  1581.  
  1582.                Note  - If there is a need to record any additional  equip-
  1583.        ment  information,  the next free codeplaces are available for that
  1584.        purpose. The codes to be used must consist of  two  characters,  be
  1585.        unique and can be chosen by bilateral agreement between Administra-
  1586.        tions.
  1587.  
  1588.  
  1589.        12.8.2  For data transmission systems this item  supplies  informa-
  1590.        tion about the multiplex configuration.
  1591.  
  1592.  
  1593.                Format for data transmission systems only :
  1594.  
  1595.                8.          XXXXXXYYYYZZZZZ
  1596.  
  1597.  
  1598.  
  1599.  
  1600.  
  1601.  
  1602.  
  1603.  
  1604.  
  1605.                Specification:
  1606.  
  1607.                XXXXXX         refers to the Recommendation series,
  1608.  
  1609.                YYYY         refers to the Recommendation number,
  1610.  
  1611.                ZZZZZ         refers to the section, paragraph, table etc.,
  1612.        number.
  1613.  
  1614.                Example:
  1615.  
  1616.                For a 9600 bit/s data transmission system with a  multiplex
  1617.        configuration as defined in Table A-1/M.1320, item 8 will present:
  1618.  
  1619.                8.          Rec. M.1320TA-1;
  1620.  
  1621.  
  1622.        12.9         Use (item 9)
  1623.  
  1624.  
  1625.             This item identifies for what purpose the  block,  path,  data
  1626.        transmission  system  is  used (if this known by the Administration
  1627.        and of use for maintenance).
  1628.  
  1629.             Format:
  1630.  
  1631.                9.          XXXXXX; (maximum 6 characters)
  1632.  
  1633.  
  1634.                Specification:
  1635.  
  1636.                 XXXXXX refers to (among others) the designatory letters Z,
  1637.        B, D, V,  etc., to indicate the use of the block. If no information
  1638.        is available, the sign - is used.
  1639.  
  1640.                Example:
  1641.  
  1642.                If the digital block Frankfurt-Luxembourg 30N1 is used  for
  1643.        sound-programme transmission:
  1644.  
  1645.                9.          R;
  1646.  
  1647.  
  1648.        12.10         Transmision medium information (item 10)
  1649.  
  1650.  
  1651.             This item identifies whether a satellite is  involved  in  the
  1652.        routing.
  1653.  
  1654.             Format:
  1655.  
  1656.                10.          ST; or -;
  1657.  
  1658.                Specification:
  1659.  
  1660.                If the block has been routed via satellite: ST
  1661.  
  1662.  
  1663.  
  1664.  
  1665.  
  1666.  
  1667.  
  1668.  
  1669.  
  1670.  
  1671.                If the block has not been routed via satellite: -
  1672.  
  1673.                Example:
  1674.  
  1675.                For the block Paris-(MU) 30N1:
  1676.  
  1677.                10.          ST;
  1678.  
  1679.  
  1680.        12.11          End-to-end information or composition  of  transmis-
  1681.        sion (item  11)
  1682.  
  1683.  
  1684.  
  1685.        12.11.1         End-to-end information (for  blocks  and  paths  on
  1686.        mixed analogue/digital routes only)
  1687.  
  1688.  
  1689.             This item provides information  on  the  destinations  of  the
  1690.        traffic carried by the block or path.
  1691.  
  1692.             Format:
  1693.  
  1694.                11.          X . |  |  X, Y . |  |  Y; (maximum 12  charac-
  1695.        ters each) or -;
  1696.  
  1697.                Specification:
  1698.  
  1699.                X . |  |  X and Y . |  |  Y are the names  of  a  town  and
  1700.        refer  to  the  destinations  of the traffic on the block/path. The
  1701.        destinations are placed according to the  order  of  towns  in  the
  1702.        traffic relation.
  1703.  
  1704.                 If the block has multiple destination  the  town  name  is
  1705.        replaced by the code: M.
  1706.  
  1707.                 If the block is within a digital environment X . |  |   X,
  1708.        Y . |  |  Y is replaced by the sign -.
  1709.  
  1710.                Example 1:
  1711.  
  1712.                 For primary digital block Frankfurt-Paris  30NC6  carrying
  1713.        from Frankfurt-London:
  1714.  
  1715.                11.          Frankfurt, London;
  1716.  
  1717.                Example 2:
  1718.  
  1719.                For  primary  block  Amsterdam-Bruxelles  30NC146  carrying
  1720.        traffic from London to Luxembourg:
  1721.  
  1722.                11.          London, Luxembourg;
  1723.  
  1724.  
  1725.        12.11.2         Composition of transmission (for data  transmission
  1726.        systems)
  1727.  
  1728.  
  1729.  
  1730.  
  1731.  
  1732.  
  1733.  
  1734.  
  1735.  
  1736.  
  1737.             This item shows the type of transmission on the data transmis-
  1738.        sion   system.
  1739.  
  1740.             Format:
  1741.  
  1742.                11.          A; N; or C;
  1743.  
  1744.                Specification:
  1745.  
  1746.                If the transmission is analogue: A
  1747.  
  1748.                If the transmission is digital: N
  1749.  
  1750.                If the transmission is mixed analogue/digital: C
  1751.  
  1752.  
  1753.  
  1754.        12.12         Bit rate (for blocks and paths) (item 12)
  1755.  
  1756.  
  1757.             This item shows the bit rate of the block or path.
  1758.  
  1759.             Format:
  1760.  
  1761.                12.          xxxx.x kbit/s or Mbit/s;
  1762.  
  1763.                Rules for the notation of the bit rate figures:
  1764.  
  1765.                 Leading zeros may be omitted and if the decimal is a zero,
  1766.        this decimal and the decimal sign may also be omitted.
  1767.  
  1768.                If the figure is up to 9 999 999, use kbit/s.
  1769.  
  1770.                If the figure is 10 000 000 or more, use Mbit/s.
  1771.  
  1772.                Note  - For data transmission systems, use the sign -.
  1773.  
  1774.                Example 1:
  1775.  
  1776.                For the digital block New York-Tokyo 24N2:
  1777.  
  1778.                12.          1544 kbit/s;
  1779.  
  1780.                Example 2:
  1781.  
  1782.                For the digital block Bruxelles-Luxembourg 480N1:
  1783.  
  1784.                12.          34 Mbit/s;
  1785.  
  1786.  
  1787.        12.13         Occupancy (for blocks and for data transmission  sys-
  1788.        tems) (item 13)
  1789.  
  1790.  
  1791.             This item lists the occupancy of the block  expressed  by  the
  1792.        next  lower blocks and/or circuits and/or data transmission systems
  1793.        which have been routed in the block.
  1794.  
  1795.  
  1796.  
  1797.  
  1798.  
  1799.  
  1800.  
  1801.  
  1802.  
  1803.             Format in the case of a primary block:
  1804.  
  1805.                (The same format  applies  to  data  transmission  systems,
  1806.        replacing  "time  slot  number"   by  "channel number" according to
  1807.        Recommendation M.1320 [14]).
  1808.  
  1809.                  .    .    .    .    .    .
  1810.  
  1811.          .    .    .    .    .    .
  1812.  
  1813.          .    .    .    .    .    .
  1814.  
  1815.                Time slot  number:  designation  of  the  circuit,  or  the
  1816.        sign -;
  1817.  
  1818.                Format in the case of a secondary or higher level block:
  1819.  
  1820.                13.          Position number: designation of a block, of  a
  1821.        leased circuit, of a data transmission system or the sign -,
  1822.  
  1823.                  .    .    .
  1824.  
  1825.          .    .    .
  1826.  
  1827.          .    .    .
  1828.  
  1829.                Position number: designation of a block, of a  leased  cir-
  1830.        cuit, of a data transmission system or the sign -,
  1831.  
  1832.                Specification:
  1833.  
  1834.                If the position number is occupied by a next lower  digital
  1835.        block: designation of this block.
  1836.  
  1837.                 If the position number is occupied  by  a  digital  leased
  1838.        circuit  (with a bit rate corresponding to the bit rate of the next
  1839.        lower multiplex level): designation of this leased circuit.
  1840.  
  1841.                If the position number is occupied by a  data  transmission
  1842.        system  (with  a bit rate corresponding to the bit rate of the next
  1843.        lower multiplex level): designation of this data transmission  sys-
  1844.        tem.
  1845.  
  1846.                If the position number is not in use: the sign -.
  1847.  
  1848.                Example 1:
  1849.  
  1850.                For the digital block Geneve-Paris 120N2:
  1851.  
  1852.                13.          01:         Geneve-Lisboa 30N1,
  1853.  
  1854.                02:         -,
  1855.  
  1856.                03:         Geneve-Paris 2048K1,
  1857.  
  1858.                04:         Bruxelles-Wien 30N1;
  1859.  
  1860.  
  1861.  
  1862.  
  1863.  
  1864.  
  1865.  
  1866.  
  1867.  
  1868.  
  1869.                Example 2:
  1870.  
  1871.                For the digital block New York-Paris 24N5:
  1872.  
  1873.                13.          01:         New York/24-Paris/PT2 Z1,
  1874.  
  1875.                02:         New York/24-Paris/PT2 Z3,
  1876.  
  1877.                03:         New York/24-Paris/PT2 Z5,
  1878.  
  1879.                04:         Paris/PT2-New York/24 Z2,
  1880.  
  1881.                05:         Paris/PT2-New York/24 Z4,
  1882.  
  1883.                06:         Paris/PT2-New York/24 Z6,
  1884.  
  1885.                07:         -,
  1886.  
  1887.                08:         -,
  1888.  
  1889.                09:         -,
  1890.  
  1891.                10:         Orlando/TS1-Toulouse/FER 64K1,
  1892.  
  1893.                11:         -,
  1894.  
  1895.                12:         -,
  1896.  
  1897.                13:         -,
  1898.  
  1899.                14:         -,
  1900.  
  1901.                15:         New York/TS1-Paris/ARC R1,
  1902.  
  1903.                16:         New York/TS1-Paris/ARC R3,
  1904.  
  1905.                17:         -,
  1906.  
  1907.                18:         -,
  1908.  
  1909.                19:         -,
  1910.  
  1911.                20:         Paris/BEA-Washington/TS1 NP1,
  1912.  
  1913.                21:         -,
  1914.  
  1915.                22:         -,
  1916.  
  1917.                23:         -,
  1918.  
  1919.                24:         -,
  1920.  
  1921.  
  1922.        12.14         Actual  number  of  channels  (primary  blocks  only)
  1923.        (item 14)
  1924.  
  1925.  
  1926.  
  1927.  
  1928.  
  1929.  
  1930.  
  1931.  
  1932.  
  1933.  
  1934.  
  1935.             This item contains the actual number of channels on a  primary
  1936.        digital block.
  1937.  
  1938.             Format:
  1939.  
  1940.                14.          xxx;
  1941.  
  1942.                Specification:
  1943.  
  1944.                xxx indicates the actual number of channels.
  1945.  
  1946.                For higher blocks xxx is replaced by the sign -.
  1947.  
  1948.                Example 1:
  1949.  
  1950.                For the digital block  New  York-Paris  30N5  dedicated  to
  1951.        leased   circuits:
  1952.  
  1953.                14.          31;
  1954.  
  1955.                Example 2:
  1956.  
  1957.                For  the  digital  block  London-New  York  30N3  used  for
  1958.        switched  public telephone circuits with ADPCM, the information may
  1959.        be:
  1960.  
  1961.                14.          60;
  1962.  
  1963.                Example 3:
  1964.  
  1965.                For the digital block Honolulu-Osaka 24N2 used for switched
  1966.        public telephone circuits:
  1967.  
  1968.                14.          24;
  1969.  
  1970.  
  1971.        12.15         Clocking information (for blocks only) (item 15)
  1972.  
  1973.  
  1974.             This item specifies whether Administrations apply  a  clocking
  1975.        system according to Rec. G.811 [15] or use a master/slave system.
  1976.  
  1977.             Format:
  1978.  
  1979.                15         XX . |  |  XX; (maximum 30 characters)
  1980.  
  1981.  
  1982.                Specification:
  1983.  
  1984.                If clocking according to Rec. G.811 is applied: Rec. G.811;
  1985.  
  1986.                If a master/slave clocking is applied:
  1987.  
  1988.                M = XX . |  |  XX,         S = XX . |  |  XX;
  1989.  
  1990.                (Town name for  the  master)          (Town  name  for  the
  1991.        slave)
  1992.  
  1993.  
  1994.  
  1995.  
  1996.  
  1997.  
  1998.  
  1999.  
  2000.  
  2001.                Example 1:
  2002.  
  2003.                Clocking according to Rec. G.811:
  2004.  
  2005.                15.          Rec. G.811;
  2006.  
  2007.                Example 2:
  2008.  
  2009.                Clocking according to Master/Slave system:
  2010.  
  2011.                15.          M = London, S = Frankfurt;
  2012.  
  2013.  
  2014.        12.16            Direction  of  transmission  (for   unidirectional
  2015.        blocks) (item 16)
  2016.  
  2017.  
  2018.             This item gives information on the direction  of  transmission
  2019.        of a unidirectional digital block.
  2020.  
  2021.             Format:
  2022.  
  2023.                16.          I; or A;
  2024.  
  2025.                Specification:
  2026.  
  2027.                If the block is unidirectional and if it has a single  des-
  2028.        tination:
  2029.  
  2030.                -         if the direction of transmission is in alphabeti-
  2031.        cal order A;
  2032.  
  2033.                -         if the direction of transmission  is  in  inverse
  2034.        alphabetical order I;
  2035.  
  2036.                Example:
  2037.  
  2038.                For  the  unidirectional  digital  block  London-Roma  30N1
  2039.        transmitting in the direction Roma to London:
  2040.  
  2041.                16.          I;
  2042.                                      ANNEX A
  2043.                             (to Recommendation M.140)
  2044.  
  2045.                    Full examples for designation information
  2046.  
  2047.  
  2048.        A.1          Full example for the designation information of a pub-
  2049.        lic switched telephone circuit
  2050.  
  2051.  
  2052.             The circuit is the 604th both-way  telephone  circuit  between
  2053.        Sherman  Oaks 4ES and Tokyo Shinjuku, operated by AT&T and KDD. The
  2054.        signalling type is CCITT No. 6 with  band/circuit  number  assigned
  2055.        as 000/03.  The control station and sub-control station of the cir-
  2056.        cuit are Sherman Oaks-transmission station 1 and Tokyo-transmission
  2057.        station 1  respectively.  Both  stations  are also the fault report
  2058.  
  2059.  
  2060.  
  2061.  
  2062.  
  2063.  
  2064.  
  2065.  
  2066.  
  2067.        points of the circuit. The circuit has been routed on the 4th chan-
  2068.        nel  of  the  first group between Sherman Oaks and Ibaraki which is
  2069.        routed via satellite and has been connected to  digital  blocks  in
  2070.        domestic networks.
  2071.  
  2072.             Designation:
  2073.  
  2074.                Sherman Oaks/4ES-Tokyo/SJK B604
  2075.  
  2076.                Related Information:
  2077.  
  2078.                1.          2;
  2079.  
  2080.                2.          USA, JPN;
  2081.  
  2082.                3.          ATT, KDD;
  2083.  
  2084.                4.          CS: Sherman Oaks/TS1,
  2085.  
  2086.                SCS1: Tokyo/TS1;
  2087.  
  2088.                5.          Sherman Oaks/TS1, Tokyo/TS1;
  2089.  
  2090.                6.          Ibaraki-Sherman Oaks 12CO1/4;
  2091.  
  2092.                7.          -;
  2093.  
  2094.  
  2095.                8.          -;
  2096.  
  2097.                9.          -;
  2098.  
  2099.                10.          ST;
  2100.  
  2101.                11.          C;
  2102.  
  2103.                12.          3.4 kHz;
  2104.  
  2105.                13.          C6, 000/03.
  2106.  
  2107.  
  2108.        A.2          Full example for  the  designation  information  of  a
  2109.        leased analogue circuit
  2110.  
  2111.  
  2112.             The circuit is the first analogue leased circuit used for data
  2113.        transmission  between  London  and  Frankfurt,  operated by British
  2114.        Telecom International and the Deutsche Bundespost.  The  signalling
  2115.        type  is  500 Hz/20 Hz. The control station and sub-control station
  2116.        of the circuit are London Mollison  and  Frankfurt 0  respectively.
  2117.        Both  stations are also the fault report points of the circuit. The
  2118.        circuit is routed on the 3rd channel of  the  first  group  between
  2119.        Frankfurt  and  London.  As  regards the parameters of the circuit,
  2120.        Recommendation M.1020 [9]  is  applied.  The  maintenance  contract
  2121.        between Administrations and customer is repair within 24 hours.
  2122.  
  2123.             Designation:
  2124.  
  2125.  
  2126.  
  2127.  
  2128.  
  2129.  
  2130.  
  2131.  
  2132.  
  2133.                Frankfurt-London DP1.
  2134.  
  2135.                Related Information:
  2136.  
  2137.                1.           24 h;
  2138.  
  2139.                2.          DEU, GBR;
  2140.  
  2141.                3.          DBP, BTI;
  2142.  
  2143.                4.          CS: London/SM,
  2144.  
  2145.                SCS1: Frankfurt/0;
  2146.  
  2147.                5.          Frankfurt/0, London/SM;
  2148.  
  2149.                6.          Frankfurt-London 1201/3;
  2150.  
  2151.                7.          -;
  2152.  
  2153.                8.          -;
  2154.  
  2155.                9.          D;
  2156.  
  2157.                10.          -;
  2158.  
  2159.                11.          A;
  2160.  
  2161.                12.          3.4 kHz;
  2162.  
  2163.                13.          500/20;
  2164.  
  2165.                14.          Rec. M.1020.
  2166.  
  2167.  
  2168.        A.3          Full examples for the designation  information  of  an
  2169.        international group and an international group links
  2170.  
  2171.  
  2172.  
  2173.        A.3.1          Full example for the designation information  of  an
  2174.        international group
  2175.  
  2176.  
  2177.             Note  - The numbers between parentheses refer to  the  numbers
  2178.        of the items in the Related Information.
  2179.  
  2180.             The international group is the fifth group  between  Amsterdam
  2181.        and  Paris.  The  urgency  for restoration (1) is 3rd priority, the
  2182.        terminal countries (2) are Netherlands and France, the  Administra-
  2183.        tions involved (3) are Netherlands PTT and France Telecom, the con-
  2184.        trol station and sub-control station (4)  are  Paris  Archives  and
  2185.        Amsterdam 1  respectively,  the fault report points (5) are Amster-
  2186.        dam 2 and Paris Archives, the routing (6) of the group  is  in  the
  2187.        supergroup Amsterdam-Bruxelles 6011 on position 1 and in the super-
  2188.        group Bruxelles-Paris 6002 on position 3, there  is  an  associated
  2189.        group  (7)  carrying  traffic  but indicated for restoration namely
  2190.  
  2191.  
  2192.  
  2193.  
  2194.  
  2195.  
  2196.  
  2197.  
  2198.  
  2199.        Amsterdam-Paris 1209,  there  is  special  equipment  involved  (8)
  2200.        because  the  group is carrying companded circuits, the use (9) is:
  2201.        Z-circuits and a DP circuit, no  satellite  (10)  is  involved,  no
  2202.        end-to-end information (11) is to be recorded, the bandwith (12) is
  2203.        48 kHz and the occupancy (13) is to be seen from the example.
  2204.  
  2205.             Designation:
  2206.  
  2207.                Amsterdam-Paris 1205
  2208.  
  2209.  
  2210.                Related Information:
  2211.  
  2212.                1.          3;
  2213.  
  2214.                2.          NLD, FRA;
  2215.  
  2216.                3.          NLDPTT, FRATEL;
  2217.  
  2218.                4.          CS: Paris/ARC,
  2219.  
  2220.                SCS1: Amsterdam/1;
  2221.  
  2222.                5.          Amsterdam/2, Paris/ARC;
  2223.  
  2224.                6.          Amsterdam-Bruxelles 6011/1,
  2225.  
  2226.                Bruxelles-Paris 6002/3;
  2227.  
  2228.                7.          S1205: Amsterdam-Paris 1209;
  2229.  
  2230.                8.          CO;
  2231.  
  2232.                9.          Z, DP;
  2233.  
  2234.                10.          -;
  2235.  
  2236.                11.          -;
  2237.  
  2238.                12.          48 kHz;
  2239.  
  2240.                13.          01:         Amsterdam-Paris Z111,
  2241.  
  2242.                02:         Amsterdam-Paris Z113,
  2243.  
  2244.                03:         Amsterdam-Paris Z115,
  2245.  
  2246.                04:         Amsterdam-Paris Z117,
  2247.  
  2248.                05:         Amsterdam-Paris Z119,
  2249.  
  2250.                06:         Amsterdam-Paris Z121,
  2251.  
  2252.                07:         Paris-Amsterdam Z120,
  2253.  
  2254.                08:         Paris-Amsterdam Z122,
  2255.  
  2256.  
  2257.  
  2258.  
  2259.  
  2260.  
  2261.  
  2262.  
  2263.  
  2264.  
  2265.                09:         Paris-Amsterdam Z124,
  2266.  
  2267.                10:         Paris-Amsterdam Z126,
  2268.  
  2269.                11:         Paris-Amsterdam Z128,
  2270.  
  2271.                12:         Amsterdam-Paris DP5,
  2272.  
  2273.  
  2274.        A.3.2          Full example for the designation information  of  an
  2275.        international group link
  2276.  
  2277.  
  2278.             Note  - The numbers between parentheses refer to  the  numbers
  2279.        of the items in the Related Information.
  2280.  
  2281.             The link is the first restoration group link between Paris and
  2282.        Geneve. The urgency for restoration (1) is 3rd priority, the termi-
  2283.        nal countries (2) are Switzerland and France,  the  Administrations
  2284.        (3)  are  Swiss PTT and France Telecom, the control and sub-control
  2285.        stations (4) are Geneve Monthoux and Paris  Archives  respectively,
  2286.        the  fault report points (5) are the same stations, the routing (6)
  2287.        is in the second supergroup between Geneve and Annemasse  on  posi-
  2288.        tion 1,  there  is  no information to be recorded about association
  2289.        (7), special equipment (8), use (9), there is no satellite involved
  2290.        (10), no end-to-end information (11) is required, the bandwith (12)
  2291.        is 48 kHz.
  2292.  
  2293.             Designation:
  2294.  
  2295.                Geneve-Paris 12801
  2296.  
  2297.                Related Information:
  2298.  
  2299.                1.          3;
  2300.  
  2301.                2.          CHE, FRA;
  2302.  
  2303.                3.          CHEPTT, FRATEL;
  2304.  
  2305.                4.          CS: Geneve/MON,
  2306.  
  2307.                SCS1: Paris/ARC;
  2308.  
  2309.                5.          Geneve/MON, Paris/ARC;
  2310.  
  2311.                6.          Annemasse-Geneve 6002/1;
  2312.  
  2313.                7.          -;
  2314.  
  2315.                8.          -;
  2316.  
  2317.                9.          -;
  2318.  
  2319.                10.          -;
  2320.  
  2321.                11.          -;
  2322.  
  2323.  
  2324.  
  2325.  
  2326.  
  2327.  
  2328.  
  2329.  
  2330.  
  2331.                12.          48 kHz;
  2332.  
  2333.  
  2334.  
  2335.        A.4          Full examples for the designation  information  of  an
  2336.        international  digital  block,  digital  path and data transmission
  2337.        system
  2338.  
  2339.  
  2340.  
  2341.        A.4.1          Full examle for the designation  information  of  an
  2342.        international digital block
  2343.  
  2344.  
  2345.             Note  - The numbers between parentheses refer to  the  numbers
  2346.        of the items in the Related Information.
  2347.  
  2348.             The international digital block is the  12th  primary  digital
  2349.        block between Roma and Paris. The urgency for restoration (1) is 2,
  2350.        the terminal countries (2) are France and  Italy,  the  Administra-
  2351.        tions involved (3) are France Telecom and ASST, control station (4)
  2352.        is Roma 1 and sub-control station  is  Paris  Archives,  the  fault
  2353.        report  points (5) are the same stations, the block has been routed
  2354.        (6) in the secondary digital block Paris-Roma  120N2 on position
  2355.  
  2356.             number 3, it has an associated block (7)  indicated  for  res-
  2357.        toration:  Paris-Roma  30N5,  no special equipment (8) is involved,
  2358.        the use of the block (9) is DP- and NP-circuits,  no  satellite  is
  2359.        involved  (10), no end-to-end information (11) is required, the bit
  2360.        rate (12) is 2.048 Mbit/s, the occupancy (13) is seen in the  exam-
  2361.        ple,  the actual number of channels (14) is 31, the clocking system
  2362.        (15) is a master/slave system with the  master  in  Paris  and  the
  2363.        slave in Roma.
  2364.  
  2365.             Designation:
  2366.  
  2367.                Paris-Roma 30N12
  2368.  
  2369.                Related Information:
  2370.  
  2371.                1.          2;
  2372.  
  2373.                2.          FRA, ITA;
  2374.  
  2375.                3.          FRATEL, ASST;
  2376.  
  2377.                4.          CS: Roma/1,
  2378.  
  2379.        SCS1: Paris/ARC;
  2380.  
  2381.                5.          Paris/ARC, Roma/1;
  2382.  
  2383.                6.          Paris-Roma 120N2/3;
  2384.  
  2385.                7.          S30N12: Paris-Roma 30N5;
  2386.  
  2387.                8.          -;
  2388.  
  2389.  
  2390.  
  2391.  
  2392.  
  2393.  
  2394.  
  2395.  
  2396.  
  2397.                9.          DP, NP;
  2398.  
  2399.                10.          -;
  2400.  
  2401.                11.          -;
  2402.  
  2403.                12.          2048 kbit/s;
  2404.  
  2405.                13.          01:         London-Roma DP12,
  2406.  
  2407.                02:         Paris-Roma DP2,
  2408.  
  2409.                03:         Napoli-Rouen NP1,
  2410.  
  2411.                04:         Paris-Roma NP3,
  2412.  
  2413.                05:         Paris-Roma NP4,
  2414.  
  2415.                06:         Paris-Roma NP5,
  2416.  
  2417.                07:         -,
  2418.  
  2419.                08:         -,
  2420.  
  2421.                09:         -,
  2422.  
  2423.                10:         Lille-Roma DP1,
  2424.  
  2425.                11:         Paris-Roma DP5,
  2426.  
  2427.                12:         -,
  2428.  
  2429.                13:         -,
  2430.  
  2431.                14:         -,
  2432.  
  2433.                15:         -,
  2434.  
  2435.                16:         Bruxelles-Roma DPM4,
  2436.  
  2437.                17:         Paris-Roma NPM1,
  2438.  
  2439.                18:         -,
  2440.  
  2441.                19:         -,
  2442.  
  2443.                20:         -,
  2444.  
  2445.                21:         -,
  2446.  
  2447.                22:         -,
  2448.  
  2449.                23:         -,
  2450.  
  2451.  
  2452.                24:         -,
  2453.  
  2454.  
  2455.  
  2456.  
  2457.  
  2458.  
  2459.  
  2460.  
  2461.  
  2462.  
  2463.                25:         -,
  2464.  
  2465.                26:         -,
  2466.  
  2467.                27:         -,
  2468.  
  2469.                28:         -,
  2470.  
  2471.                29:         -,
  2472.  
  2473.                30:         -,
  2474.  
  2475.                31:         -;
  2476.  
  2477.                14.          31;
  2478.  
  2479.                15.          M = Paris, S = Roma;
  2480.  
  2481.  
  2482.        A.4.2          Full example for the designation information  of  an
  2483.        international digital path
  2484.  
  2485.  
  2486.             Note  - The numbers between parentheses refer to  the  numbers
  2487.        of the items in the Related Information.
  2488.  
  2489.             The international digital path is the first restoration  digi-
  2490.        tal  second order path between Paris and Bruxelles. The urgency for
  2491.        restoration (1) is 3, the terminal countries (2)  are  Belgium  and
  2492.        France,  the  Administrations  involved (3) are the Belgium RTT and
  2493.        France  Telecom,  control  station  (4)  is   Bruxelles   BLA   and
  2494.        sub-control  station is Paris Archives, the fault report points (5)
  2495.        are the same stations, the path has been routed (6)  in  the  first
  2496.        third  order  block Bruxelles-Paris on position number 1, there are
  2497.        no associated blocks (7), no special equipment (8), use (9) has not
  2498.        been indicated, no satellite is involved (10), no end-to-end infor-
  2499.        mation (11) is required, the bit rate (12) is 8.448 Mbit/s.
  2500.  
  2501.             Designations:
  2502.  
  2503.                Bruxelles-Paris 120N801
  2504.  
  2505.                Related Information:
  2506.  
  2507.                1.          3;
  2508.  
  2509.                2.          BEL, FRA;
  2510.  
  2511.                3.          BELRTT, FRATEL;
  2512.  
  2513.                4.          CS: Bruxelles/BLA,
  2514.  
  2515.                SCS1: Paris/ARC;
  2516.  
  2517.                5.          Bruxelles/BLA, Paris/ARC;
  2518.  
  2519.                6.          Bruxelles-Paris 480N1/1;
  2520.  
  2521.  
  2522.  
  2523.  
  2524.  
  2525.  
  2526.  
  2527.  
  2528.  
  2529.                7.          -;
  2530.  
  2531.                8.          -;
  2532.  
  2533.                9.          -;
  2534.  
  2535.                10.          -;
  2536.  
  2537.                11.          -;
  2538.  
  2539.                12.          8448 kbit/s;
  2540.  
  2541.  
  2542.        A.4.3          Full example for the designation information  of  an
  2543.        international data transmission system
  2544.  
  2545.  
  2546.             Note  - The numbers between parentheses refer to  the  numbers
  2547.        of the items in the Related Information.
  2548.  
  2549.             The international data transmission system  is  the  first  64
  2550.        kbit/s  data  transmission  system  between  London  and Paris. The
  2551.        urgency for restoration (1) is 1, the terminal  countries  (2)  are
  2552.        United  Kingdom  and  France,  the Administrations involved (3) are
  2553.        British Telecom International and France
  2554.  
  2555.             Telecom, the control and sub-control stations (4)  are  London
  2556.        Mollison  and  Paris Archives respectively, the fault report points
  2557.        (5) are the same stations, the system has been routed  (6)  in  the
  2558.        12th  primary  block between Paris and London on timeslot number 3,
  2559.        there is no information  to  be  recorded  about  association  (7),
  2560.        equipment  information  (8)  and  use  (9),  there  is no satellite
  2561.        involved (10), composition of transmission (11), is  digital,  item
  2562.        (12) does not apply, the occupancy (13) is seen in the example.
  2563.  
  2564.             Designation:
  2565.  
  2566.                London-Paris 64K1
  2567.  
  2568.                Related Information:
  2569.  
  2570.                1.          1;
  2571.  
  2572.                2.          GBR, FRA;
  2573.  
  2574.                3.          BTI, FRATEL;
  2575.  
  2576.  
  2577.                4.          CS: London/SM,
  2578.  
  2579.                SCS1: Paris/ARC;
  2580.  
  2581.                5.          London/SM, Paris/ARC;
  2582.  
  2583.                6.          London-Paris 30N12/3;
  2584.  
  2585.                7.          -;
  2586.  
  2587.  
  2588.  
  2589.  
  2590.  
  2591.  
  2592.  
  2593.  
  2594.  
  2595.                8.          -;
  2596.  
  2597.                9.          -;
  2598.  
  2599.                10.          -;
  2600.  
  2601.                11.          N;
  2602.  
  2603.                12.          -;
  2604.  
  2605.                13.          A4:         London-Paris NP12,
  2606.  
  2607.                B4:         London-Toulouse NP3,
  2608.  
  2609.                C4:         -;
  2610.  
  2611.                D4:         Dublin-Paris NP6,
  2612.  
  2613.                E4:         London-Paris NP11,
  2614.  
  2615.                F4:         London-Paris NP14;
  2616.                                      ANNEX B
  2617.                             (to Recommendation M.140)
  2618.  
  2619.            Reference section numbers for the various types of routes
  2620.  
  2621.  
  2622.        Section         Type of international route
  2623.  
  2624.  
  2625.  
  2626.        1.2.2         Telephone circuits used in manual operation
  2627.  
  2628.  
  2629.        1.2.3         One-way telephone circuits used for semi-automatic or
  2630.        automatic operation
  2631.  
  2632.        1.2.4         Both-way telephone circuits used  for  semi-automatic
  2633.        or automatic operation
  2634.  
  2635.        1.3         Circuits used for switched telex and telegraph service
  2636.  
  2637.        1.4         Circuits in the international public switched data net-
  2638.        work
  2639.  
  2640.        3.2.2         Analogue leased circuit used for telephony
  2641.  
  2642.        3.2.3.1         Analogue circuits used for voice-frequency telegra-
  2643.        phy
  2644.  
  2645.        3.2.3.2         Analogue leased circuits used for TDM-telegraphy
  2646.  
  2647.        3.2.4         Leased telegraph circuits
  2648.  
  2649.        3.2.5         Analogue leased circuits used for data transmission
  2650.  
  2651.        3.2.6         Analogue leased circuits used for phototelegraphy  or
  2652.  
  2653.  
  2654.  
  2655.  
  2656.  
  2657.  
  2658.  
  2659.  
  2660.  
  2661.        facsimile
  2662.  
  2663.        3.2.7.1          Analogue  leased  unidirectional   sound-programme
  2664.        transmission circuits
  2665.  
  2666.        3.2.7.2           Analogue   leased   reversible    sound-programme
  2667.        transmission circuits
  2668.  
  2669.        3.2.8.1         Analogue leased unidirectional television-programme
  2670.        circuits
  2671.  
  2672.        3.2.8.2          Analogue  leased  reversible  television-programme
  2673.        circuits
  2674.  
  2675.        3.2.9         Leased circuits used for digital video transmission
  2676.  
  2677.        3.2.10          Analogue leased circuits connecting circuit  multi-
  2678.        plication terminal equipment at renters' premises
  2679.  
  2680.        3.2.11         Analogue leased circuits used  for  combinations  of
  2681.        transmissions, etc.
  2682.  
  2683.        3.2.12         Analogue leased circuits connecting  three  or  more
  2684.        locations
  2685.  
  2686.        3.2.13         Leased analogue groups, supergroups, etc.
  2687.  
  2688.        3.2.14         Leased analogue group, supergroup links
  2689.  
  2690.        3.2.15         Digital leased circuits connecting two locations
  2691.  
  2692.        3.2.16         Digital leased circuits  connecting  three  or  more
  2693.        locations
  2694.  
  2695.  
  2696.        3.3.2.1           Public   circuits   used    for    unidirectional
  2697.        sound-programme transmission
  2698.  
  2699.        3.3.2.2         Public circuits used for reversible sound-programme
  2700.        transmission
  2701.  
  2702.        3.3.2.3            Public    circuits    used    for    narrow-band
  2703.        sound-programme transmission
  2704.  
  2705.        3.3.3.1         Public circuits used for unidirectional  television
  2706.        transmission
  2707.  
  2708.        3.3.3.2         Public  circuits  used  for  reversible  television
  2709.        transmission
  2710.  
  2711.        3.3.4         Public circuits for digital audio and video transmis-
  2712.        sion
  2713.  
  2714.        3.3.5         Public telephone-type circuits used for phototelegra-
  2715.        phy or facsimile
  2716.  
  2717.        3.3.6           Telephone-type    circuits    used    to    provide
  2718.  
  2719.  
  2720.  
  2721.  
  2722.  
  2723.  
  2724.  
  2725.  
  2726.  
  2727.        voice-frequency telegraph links
  2728.  
  2729.        3.3.7         Telephone-type circuits used to provide time division
  2730.        multiplex telegraph systems
  2731.  
  2732.        3.3.8         Telephone-type circuits used for data transmission
  2733.  
  2734.        3.3.9         Telephone-type circuits used as  transfer  links  for
  2735.        common channel Signalling Systems Nos. 6 and 7
  2736.  
  2737.        5.2.1         Groups (bidirectional)
  2738.  
  2739.        5.2.2         Supergroups (bidirectional)
  2740.  
  2741.        5.2.3         Mastergroups (bidirectional)
  2742.  
  2743.        5.2.4         Supermastergroup (bidirectional)
  2744.  
  2745.        5.2.6         Restoration groups and supergroups (bidirectional)
  2746.  
  2747.        5.3.1         Multiple destination unidirectional groups and super-
  2748.        groups
  2749.  
  2750.        5.3.2         Single destination unidirectional groups  and  super-
  2751.        groups
  2752.  
  2753.        6.1.1         Conventional group and supergroup links
  2754.  
  2755.        6.1.2         Restoration links
  2756.  
  2757.        6.2         Line links
  2758.  
  2759.        8.2         Bidirectional digital blocks
  2760.  
  2761.        8.3         Restoration digital blocks
  2762.  
  2763.        8.4         Multiple destination unidirectional digital blocks
  2764.  
  2765.        8.5         Single destination unidirectional digital blocks
  2766.  
  2767.        9.1         Conventional digital paths
  2768.  
  2769.        9.2         Restoration digital paths
  2770.  
  2771.        10.1.1          Groups   and   supergroups,   etc.   on   a   mixed
  2772.        analogue/digital route
  2773.  
  2774.        10.1.2         Digital blocks and paths on a mixed analogue/digital
  2775.        route
  2776.  
  2777.        10.2         Routes with two analogue-to-digital conversions
  2778.  
  2779.        11.1         Data transmisssion systems
  2780.  
  2781.        11.2         Data transmission links
  2782.  
  2783.  
  2784.  
  2785.  
  2786.  
  2787.  
  2788.  
  2789.  
  2790.  
  2791.  
  2792.  
  2793.                References
  2794.  
  2795.  
  2796.        [1]         CCITT Recommendation Terms and definitions  of  traffic
  2797.        engineering , Vol. II, Rec. E.600.
  2798.  
  2799.        [2]            ISO  International  standard  3166  Codes  for   the
  2800.        representation of names of countries , Second edition, 1981.
  2801.  
  2802.        [3]           CCITT  Recommendation  Designation  of  international
  2803.        telegraph circuits , Vol. VI, Rec. R.70.
  2804.  
  2805.        [4]          CCITT Recommendation Lining up an  international  mil-
  2806.        titerminal leased circuit , Vol. IV, Rec. M.1055.
  2807.  
  2808.        [5]           CCITT  Recommendation  Circuit  control  station  for
  2809.        leased and special circuits , Vol. IV, Rec. M.1012.
  2810.  
  2811.        [6]         CCITT Recommendation Sub-control station for leased and
  2812.        special circuits , Vol. IV, Rec. M.1013.
  2813.  
  2814.        [7]         CCITT Recommendation Preliminary exchange  of  informa-
  2815.        tion  for the provision of international leased circuits , Vol. IV,
  2816.        Rec. M.1045.
  2817.  
  2818.  
  2819.        [8]          CCITT Recommendation Signalling systems to be used for
  2820.        international  normal  and  automatic working on analog leased cir-
  2821.        cuits , Vol. VI, Rec. Q.8.
  2822.  
  2823.        [9]          CCITT Recommendation Characteristics of special  qual-
  2824.        ity international leased circuits with special bandwidth condition-
  2825.        ing , Vol. IV, Rec.  M.1020.
  2826.  
  2827.        [10]         CCITT Recommendations concerning the Specification  of
  2828.        primary,  secondary  and higher order digital multiplex equipment ,
  2829.        Vol. III, Rec. G.731 to G.755.
  2830.  
  2831.        [11]          CCITT  Recommendation  Transmission   impairments   ,
  2832.        Vol. III, Rec. G.113.
  2833.  
  2834.        [12]          CCITT Recommendation International telephone  routing
  2835.        plan , Vol.  II, Rec. E.171.
  2836.  
  2837.        [13]         CCITT Recommendation Digital  hierarchy  bit  rates  ,
  2838.        Vol. III, Rec. G.702.
  2839.  
  2840.        [14]         CCITT Recommendation Numbering  of  channels  in  data
  2841.        transmission systems , Vol. IV, Rec. M.1320.
  2842.  
  2843.        [15]          CCITT Recommendation Timing requirements at the  out-
  2844.        puts of reference clocks and network nodes suitable for plesiochro-
  2845.        nous  operation  of  international  digital   links   ,   Vol. III,
  2846.        Rec. G.811.
  2847.  
  2848.  
  2849.        Recommendation M.160
  2850.  
  2851.  
  2852.  
  2853.  
  2854.  
  2855.  
  2856.  
  2857.  
  2858.  
  2859.                            STABILITY OF TRANSMISSION
  2860.  
  2861.  
  2862.  
  2863.  
  2864.        1       Variation of circuit overall loss with time
  2865.  
  2866.  
  2867.             1.1 The objective is that the following values should  not  be
  2868.        exceeded:
  2869.  
  2870.  
  2871.             1.1.1 difference between the mean value and the nominal  value
  2872.        of the overall transmission loss:
  2873.  
  2874.             0.5 dB for all circuits,
  2875.  
  2876.             1.1.2 standard deviation about the mean value of the variation
  2877.        of the overall transmission loss:
  2878.  
  2879.             1.0 dB for all circuits.
  2880.  
  2881.             However, in the case of circuits which are set up,  wholly  or
  2882.        in  part, on older type equipment, and which are composed of two or
  2883.        more circuit sections, a standard deviation  not  exceeding  1.5 dB
  2884.        may be admitted.
  2885.  
  2886.             1.2 The method for achieving the  above  objective  values  is
  2887.        left to the discretion of Administrations (better maintenance, fit-
  2888.        ting of automatic regulators, etc.).
  2889.  
  2890.  
  2891.  
  2892.        2 Variation of pilot levels with time on  group,  supergroup,  etc.
  2893.        links
  2894.  
  2895.  
  2896.             2.1 The objective is that the following  values  of  M  and  S
  2897.        should  be  met, where M represents the mean deviation of the pilot
  2898.        level from its nominal value and S represents the  standard  devia-
  2899.        tion of the variations of the pilot level:
  2900.  
  2901.  
  2902.             2.2 conditions concerning through-connection points of  group,
  2903.        supergroup, etc. links:
  2904.  
  2905.  
  2906.                             | |   0.5 dB,  S  1.3 dB
  2907.  
  2908.  
  2909.             2.3 conditions concerning the receiving end:
  2910.  
  2911.        _________________________
  2912.        Recommendation G.214 [4] also concerns the  subject  of
  2913.        the stability of transmission.
  2914.        See [1] concerning questions of statistical theory.
  2915.  
  2916.  
  2917.  
  2918.  
  2919.  
  2920.  
  2921.  
  2922.  
  2923.  
  2924.  
  2925.             2.3.1 group links:
  2926.  
  2927.                             | |   0.3 dB,  S  0.6 dB
  2928.  
  2929.  
  2930.             2.3.2 supergroup links:
  2931.  
  2932.        | |   0.3 dB,  S  0.5 dB
  2933.  
  2934.  
  2935.  
  2936.  
  2937.             2.3.3 mastergroup links:
  2938.  
  2939.                             | |   0.3 dB,  S  0.4 dB
  2940.  
  2941.  
  2942.             2.3.4 supermastergroup links:
  2943.  
  2944.                             | |   0.3 dB,  S  0.3 dB.
  2945.  
  2946.  
  2947.  
  2948.        3       Practical application of limits
  2949.  
  2950.  
  2951.             The assumption is made that the limits set out in  SS 1  and 2
  2952.        above for the variation with time of:
  2953.  
  2954.                -         the loss of each individual circuit, or
  2955.  
  2956.                -         the level of each individual  group,  supergroup,
  2957.        etc.  pilot,
  2958.  
  2959.        may be used as limits for the results of measurements made on a set
  2960.        of  circuits, groups, supergroups, etc. at a given time. Experience
  2961.        indicates that such a  use  has  a  practical  validity  and  hence
  2962.        Administrations are encouraged to use this Recommendation as giving
  2963.        currently practical limits for sets  of  circuits,  groups,  super-
  2964.        groups, etc. This does not preclude the application of these limits
  2965.        to single circuits, groups, supergroups, etc.
  2966.  
  2967.  
  2968.        4       Reline-up of circuits, groups, supergroups, etc.
  2969.  
  2970.  
  2971.             When a circuit, group, supergroup, etc., has  its  routing  or
  2972.        composition  permanently changed over part or all of its length, it
  2973.        is essential to ensure that a  complete  line-up  of  the  circuit,
  2974.        group, etc., is made in accordance with the relevant line-up Recom-
  2975.        mendations since the rerouting constitutes  a  re-establishment  of
  2976.        the circuit, group, etc.
  2977.  
  2978.             This procedure is necessary in order to maintain the transmis-
  2979.        sion  performance  and stability of the network. The pressing needs
  2980.        of the operating services should not be allowed  to  prevent  these
  2981.        measurements from being properly carried out, since this could only
  2982.  
  2983.  
  2984.  
  2985.  
  2986.  
  2987.  
  2988.  
  2989.  
  2990.  
  2991.        result in a degradation of the stability  and  performance  of  the
  2992.        circuits  in  the network. Under all circumstances the circuit con-
  2993.        trol station should be kept advised.
  2994.  
  2995.  
  2996.        5       Basic factors for transmission stability
  2997.  
  2998.  
  2999.             The CCITT recommends that the following basic  factors  should
  3000.        be taken into account for achieving a stable network:
  3001.  
  3002.  
  3003.        5.1         Staff training
  3004.  
  3005.  
  3006.             The importance of this factor cannot be overemphasized.
  3007.  
  3008.             The staff should understand why level  variations  are  to  be
  3009.        kept  to  a low value and should be made fully aware of the results
  3010.        of incorrect adjustments. It is important that  adjustments  should
  3011.        be  made  only  when  absolutely necessary and an adjustment should
  3012.        never be made to cover up a fault.
  3013.  
  3014.             The staff must realize the possible effects of a brief interr-
  3015.        uption on any type of circuit.
  3016.  
  3017.  
  3018.        5.2         Design of installations
  3019.  
  3020.  
  3021.             Installations should be such  that  sudden  interruptions  are
  3022.        avoided. For example, this may be achieved by:
  3023.  
  3024.                a)         the arrangement  of  transmission  equipment  to
  3025.        facilitate  maintenance, patching out, the replacement of subassem-
  3026.        blies;
  3027.  
  3028.                b)         the design of carrier generators with a view  to
  3029.        great reliability;
  3030.  
  3031.                c)         the design of power supplies; attention is  par-
  3032.        ticularly drawn to the importance of the judicious choice and grad-
  3033.        ing of protective devices (fuses, circuit-breakers)  in  the  power
  3034.        feeds to repeater station racks.
  3035.  
  3036.             Note  - See in this connection Recommendation G.231 [2].
  3037.  
  3038.  
  3039.        5.3         Care in  the  organization  of  work  in  international
  3040.        exchanges, repeater stations, and on the transmission lines, cables
  3041.        and systems used in the international network
  3042.  
  3043.  
  3044.             Experience has shown that operations carried out  on  exchange
  3045.        and  repeater  station equipment and on the external plants (under-
  3046.        ground cables, etc.) are a major cause  of  attenuation  and  phase
  3047.        variations  and  of  interruptions  to service in the international
  3048.  
  3049.  
  3050.  
  3051.  
  3052.  
  3053.  
  3054.  
  3055.  
  3056.  
  3057.        network.
  3058.  
  3059.  
  3060.             All work liable to cause interference should therefore be car-
  3061.        ried  out,  when  possible,  at  times of light traffic. It must be
  3062.        recognized that for very long routes it  will  become  increasingly
  3063.        difficult  to  find  suitable  periods of light traffic, bearing in
  3064.        mind the time differences which will  exist  between  the  terminal
  3065.        countries  on  such routes. This will require good coordination and
  3066.        cooperation between Administrations.  In  particular,  the  control
  3067.        stations    should    be    consulted    well   in   advance   (see
  3068.        Recommendation M.490).
  3069.  
  3070.  
  3071.        5.4         Care in the organization of maintenance
  3072.  
  3073.  
  3074.             The same reasons for transferring working operations to  times
  3075.        of light traffic apply to maintenance operations.
  3076.  
  3077.             It is desirable to avoid all equipment changeovers  which  are
  3078.        not absolutely necessary.
  3079.  
  3080.             It is also desirable to guard against  maintenance  operations
  3081.        which  appear  harmless  but  which  may,  however, result in short
  3082.        interruptions and which are all the more dangerous if  they  affect
  3083.        common units (e.g. changeover of master oscillators).
  3084.  
  3085.  
  3086.        5.5         Power supplies
  3087.  
  3088.  
  3089.             5.5.1 Too frequent changeover of power  supplies  for  routine
  3090.        maintenance  must be avoided. It should be possible to make partial
  3091.        tests to check that the  standby  motor-generator  starts,  without
  3092.        changing over the power supplies.
  3093.  
  3094.             5.5.2 The instruction or training of staff during the  day  on
  3095.        working power supplies should be forbidden.
  3096.  
  3097.             5.5.3 Changeover of power supplies should be  carried  out  at
  3098.        times of light traffic and as far as possible at night.
  3099.  
  3100.             5.5.4 To ensure that circuits in the international network are
  3101.        not  interrupted  owing  to  the  failure of public power supplies,
  3102.        repeater  stations  in  the  international  network   should   have
  3103.        power-continuity  arrangements  which  ensure that the transmission
  3104.        equipment continues to operate, without any interruption ,  in  the
  3105.        event of a failure of the public power supply.
  3106.  
  3107.  
  3108.        5.6         Care in the testing of new equipment
  3109.  
  3110.  
  3111.             Equipment should not be put into service until after the  most
  3112.        thorough  inspection.  It  is necessary to ensure that the pressing
  3113.        needs of the operating services do not result in these tests  being
  3114.  
  3115.  
  3116.  
  3117.  
  3118.  
  3119.  
  3120.  
  3121.  
  3122.  
  3123.        omitted or hastily done.
  3124.  
  3125.             Where  the  urgent  requirements  of  the  operating  services
  3126.        resulted  in  equipment  being  put into service before it had been
  3127.        sufficiently tested, the equipment should be temporarily taken  out
  3128.        of service and a thorough inspection made as soon as possible.
  3129.  
  3130.  
  3131.        5.7         Vibration testing
  3132.  
  3133.  
  3134.             Vibration tests, using the principles described in  [3],  help
  3135.        in  improving  transmission  stability and in ensuring satisfactory
  3136.        operation of transmission equipment. They should be made,  wherever
  3137.        applicable,  when  new equipment is put into service, under special
  3138.        circumstances for fault locating purposes  or  even  as  a  routine
  3139.        measure for preventive maintenance, if the Administration concerned
  3140.        deems it necessary.
  3141.  
  3142.  
  3143.        5.8          Automatic regulation by pilots (group  pilots,  super-
  3144.        group pilots, etc.)
  3145.  
  3146.  
  3147.             In carrier systems, the presence of pilots (line pilots, group
  3148.        pilots,  supergroup  pilots, etc.)  makes  it possible to supervise
  3149.        transmission, to  keep  track  of  short-duration  phenomena  where
  3150.        necessary  and  to  give the alarm if there are large variations in
  3151.        level.
  3152.  
  3153.             Regulation by pilots and the way such  regulation  (manual  or
  3154.        automatic)  is  carried  out  has a decisive effect on transmission
  3155.        stability. In addition to regulation by  line  pilots,  with  which
  3156.        wideband  transmission  systems  are  normally  equipped, it may be
  3157.        necessary to regulate the  group  links  themselves  (group  links,
  3158.        supergroup links, etc.), both to achieve adequate stability for the
  3159.        circuits formed from the groups and to  reduce  system  overloading
  3160.        risks due to the existence of unduly high line levels.
  3161.  
  3162.  
  3163.             Automatic regulation of links is a convenient  means  to  meet
  3164.        the  requirements  for the values of M and S of the pilot levels as
  3165.        stated under S 2 above. Therefore, automatic regulators  should  be
  3166.        fitted  into  a  link when these limits cannot be achieved by other
  3167.        means.
  3168.  
  3169.             However, when setting up a link the need for fitting automatic
  3170.        regulators cannot be determined solely by these requirements. It is
  3171.        also necessary to take practical considerations into  account  such
  3172.        as those given in the Annex to this Recommendation.
  3173.  
  3174.             In the case of through-connection points of group, supergroup,
  3175.        etc.   links,  the insertion of automatic regulators prevents over-
  3176.        loading  of  sections  further  down  the  line.  If  a   link   is
  3177.        through-connected  several  times and several regulators have to be
  3178.        inserted for the same direction of transmission to meet the  condi-
  3179.        tions  of  S 2.2  above,  the first insertion should be made at the
  3180.  
  3181.  
  3182.  
  3183.  
  3184.  
  3185.  
  3186.  
  3187.  
  3188.  
  3189.        first through-connection point requiring regulation in that  direc-
  3190.        tion  of  transmission.  A  regulator  should  be  inserted  at the
  3191.        through-connection point nearest  the  frontier  (in  the  outgoing
  3192.        direction)  when  there  are  one  or more other through-connection
  3193.        points before this point on the same link. This is to  ensure  that
  3194.        the  level  of the signals entering the next country is kept within
  3195.        the prescribed limits.
  3196.                                      ANNEX A
  3197.                             (to Recommendation M.160)
  3198.  
  3199.                        Practical aspects to be considered
  3200.  
  3201.                     when determining the need for regulators
  3202.  
  3203.             When setting up a link the need for fitting regulators  cannot
  3204.        be  determined  solely  by  the  requirements  of S 2 above of this
  3205.        Recommendation. It is necessary to  take  the  following  practical
  3206.        considerations into account.
  3207.  
  3208.  
  3209.             A.1 In order to establish that  a  link  meets  the  stability
  3210.        requirements  of this Recommendation it is either necessary to con-
  3211.        duct long-term tests at the time of  setting  up  the  link  or  to
  3212.        accept  measurements made on similar links, that is, to predict the
  3213.        performance.
  3214.  
  3215.  
  3216.             If the former method is adopted, then, in the case of  a  link
  3217.        passing  in transit through the territory of a third Administration
  3218.        it is probable that transit charges will apply from  the  date  the
  3219.        link is set up. In any event, the cooperation of the distant termi-
  3220.        nal Administration will be required and this  may  not  be  readily
  3221.        forthcoming.
  3222.  
  3223.             If the latter method is adopted and the stability requirements
  3224.        are  not met, then the problem will arise of taking the link out of
  3225.        service to fit a regulator and  to  reline  the  link.  This  could
  3226.        entail  a  substantial loss of revenue and will require distant end
  3227.        cooperation.
  3228.  
  3229.             A.2 It is unusual for a supergroup to  be  provided  with  all
  3230.        five groups allocated from the outset and it cannot be assumed that
  3231.        these groups will end at the same point as the supergroup.  In  any
  3232.        case,  if  a  group  that  ends  at  the same point is changed to a
  3233.        through-group, then, unless a supergroup regulator has already been
  3234.        fitted, it may be necessary to interrupt service to fit a regulator
  3235.        and reline the supergroup link.
  3236.  
  3237.  
  3238.             A.3 Consideration also has to  be  given  to  the  restoration
  3239.        requirements  when  deciding to fit regulators to supergroup links.
  3240.        Lack of such regulators may seriously hamper  restoration  arrange-
  3241.        ments.
  3242.  
  3243.  
  3244.             A.4 Frequent rearrangements occur on international routes  and
  3245.        are outside the control of the distant Administration.
  3246.  
  3247.  
  3248.  
  3249.  
  3250.  
  3251.  
  3252.  
  3253.  
  3254.  
  3255.                References
  3256.  
  3257.  
  3258.        [1]         CCITT  Supplement  Statistical  theory  requirements  ,
  3259.        Green Book, Vol. IV.2, Supplement No. 1.6, ITU, Geneva, 1973.
  3260.  
  3261.        [2]         CCITT Recommendation Arrangement of carrier equipment ,
  3262.        Vol. III, Rec. G.231.
  3263.  
  3264.        [3]          CCITT  Supplement  Vibration  testing  ,  Green  Book,
  3265.        Vol. IV.2, Supplement No. 2.9, ITU, Geneva, 1973.
  3266.  
  3267.        [4]         CCITT Recommendation Line stability of cable systems  ,
  3268.        Vol. III, Rec. G.214.
  3269.  
  3270.  
  3271.  
  3272.        Recommendation M.250
  3273.  
  3274.  
  3275.             USE OF CCITT MAN-MACHINE LANGUAGE (MML) FOR MAINTENANCE
  3276.  
  3277.  
  3278.  
  3279.  
  3280.        1       MML as an instrument of maintenance
  3281.  
  3282.  
  3283.  
  3284.        1.1         Introduction
  3285.  
  3286.  
  3287.             This Recommendation provides an introduction to the subject of
  3288.        MML as an instrument of maintenance.
  3289.  
  3290.             MML is a stored program controlled (SPC)  facility  which  can
  3291.        operate only within a computer controlled environment. When consid-
  3292.        ering international telephone system  maintenance  this  will  gen-
  3293.        erally mean an SPC controlled exchange or network.
  3294.  
  3295.             MML is the medium used by the operations and maintenance staff
  3296.        to communicate with the exchange control processor and vice versa
  3297.  
  3298.             The purposes of this Recommendation are to:
  3299.  
  3300.                -          bring to the attention of the user the range  of
  3301.        functions   and   facilities   offered  by  MML  in  the  field  of
  3302.        _________________________
  3303.        The structure, syntax and semantics of  MML  are  fully
  3304.        described  in the Series Z Recommendations published in
  3305.        Volume VI. Recommendation Z.311 describes the basis  of
  3306.        the CCITT man-machine language and its fields of appli-
  3307.        cation. It also identifies the  content  of  the  other
  3308.        Series Z  Recommendations all of which are addressed to
  3309.        the implementors of such languages rather than  to  the
  3310.        users.
  3311.  
  3312.  
  3313.  
  3314.  
  3315.  
  3316.  
  3317.  
  3318.  
  3319.  
  3320.  
  3321.        maintenance;
  3322.  
  3323.                -         identify the full  range  of  MML  functions  and
  3324.        facilities provided to deal with maintenance;
  3325.  
  3326.                -          define a standard terminology  to  describe  the
  3327.        conditions that can exist within an SPC network.
  3328.  
  3329.             The objectives, tests and measurements for the maintenance  of
  3330.        circuits  between  exchanges,  remain  as described in all relevant
  3331.        Series M Recommendations. This Recommendation does not seek to sup-
  3332.        plant existing
  3333.  
  3334.        Recommendations nor to provide alternative methods  or  values  for
  3335.        maintenance  but  to  give  guidance on how the use of MML might be
  3336.        applied to existing standards and procedures.
  3337.  
  3338.  
  3339.        1.2         Definition of MML functions
  3340.  
  3341.  
  3342.             MML functions are those system functions which provide the MML
  3343.        user with the means of control of system functions by MML. The word
  3344.        "control" is assumed to include all types of inputs and outputs.
  3345.  
  3346.             Any MML function can be subdivided into a general  part  which
  3347.        relates to items such as the syntax check, information transmission
  3348.        control, etc., and an application part which relates to the job  in
  3349.        hand.
  3350.  
  3351.             The relationship between actual  jobs  to  be  performed,  MML
  3352.        functions and system functions is shown in Figure 1/M.250.
  3353.  
  3354.  
  3355.                                                         Figure 1/M.250, p.
  3356.  
  3357.  
  3358.  
  3359.  
  3360.             1.3 Although the purpose of this Recommendation  is  to  cover
  3361.        the  whole  maintenance  field,  the following paragraphs deal only
  3362.        with maintenance of circuits between exchanges.  The  rest  is  for
  3363.        further study.
  3364.  
  3365.  
  3366.  
  3367.        2       List of system functions associated with the maintenance of
  3368.        circuits between exchanges
  3369.  
  3370.  
  3371.             Table 1/M.250 presents a list of functions associated with the
  3372.        maintenance  of  circuits between exchanges which are considered to
  3373.        be controllable by means of MML.
  3374.                                  H.T. [T1.250]
  3375.                                   TABLE 1/M.250
  3376.                             List of system functions
  3377.  
  3378.  
  3379.  
  3380.  
  3381.  
  3382.  
  3383.  
  3384.  
  3385.  
  3386.  
  3387.        _________________________________________________________________________________________________________
  3388.                                            1                                        {
  3389.               Tests/measurements of one circuit or a group of circuits and
  3390.                                  associated equipments
  3391.                                             }
  3392.                                            2                                        {
  3393.            Observation and supervision of circuits and associated equipments
  3394.                                    between exchanges
  3395.                                             }
  3396.                                            3                                        {
  3397.         Control of the status of a circuit or a group of circuits and associated
  3398.                                        equipments
  3399.                                             }
  3400.                                            4                                       Analysis of maintenance data
  3401.                                            5                                        {
  3402.                    Administration and control of maintenance reports
  3403.                                             }
  3404.        _________________________________________________________________________________________________________
  3405.  
  3406.       |
  3407.       |
  3408.       |
  3409.       |
  3410.       |
  3411.       |
  3412.       |
  3413.       |
  3414.       |
  3415.       |
  3416.       |
  3417.       |
  3418.       |
  3419.       |
  3420.       |
  3421.       |
  3422.       |
  3423.  
  3424.  
  3425.  
  3426.  
  3427.  
  3428.  
  3429.  
  3430.  
  3431.  
  3432.  
  3433.  
  3434.  
  3435.  
  3436.  
  3437.  
  3438.                                                                                 |
  3439.                                                                                 |
  3440.                                                                                 |
  3441.                                                                                 |
  3442.                                                                                 |
  3443.                                                                                 |
  3444.                                                                                 |
  3445.                                                                                 |
  3446.                                                                                 |
  3447.                                                                                 |
  3448.                                                                                 |
  3449.                                                                                 |
  3450.                                                                                 |
  3451.                                                                                 |
  3452.                                                                                 |
  3453.                                                                                 |
  3454.                                                                                 |
  3455.  
  3456.  
  3457.  
  3458.  
  3459.  
  3460.  
  3461.  
  3462.  
  3463.  
  3464.  
  3465.  
  3466.  
  3467.  
  3468.  
  3469.  
  3470.                                                                                                                |
  3471.                                                                                                                |
  3472.                                                                                                                |
  3473.                                                                                                                |
  3474.                                                                                                                |
  3475.                                                                                                                |
  3476.                                                                                                                |
  3477.                                                                                                                |
  3478.                                                                                                                |
  3479.                                                                                                                |
  3480.                                                                                                                |
  3481.                                                                                                                |
  3482.                                                                                                                |
  3483.                                                                                                                |
  3484.                                                                                                                |
  3485.                                                                                                                |
  3486.                                                                                                                |
  3487.  
  3488.  
  3489.  
  3490.  
  3491.  
  3492.  
  3493.  
  3494.  
  3495.  
  3496.  
  3497.  
  3498.  
  3499.  
  3500.  
  3501.  
  3502.  
  3503.  
  3504.                                                         Table [T1.250], p.
  3505.  
  3506.  
  3507.             The broad categories of system function shown in Table 1/M.250
  3508.        relate  to  the activities engaged in by all Administrations with a
  3509.        responsibility for  the  maintenance  of  circuits  interconnecting
  3510.        exchanges.  The  application  of these activities will vary between
  3511.        Administrations as will the proportion of such activities that  are
  3512.        performed  by  some  degree  of  mechanization  (partial  or  fully
  3513.        automatic).
  3514.  
  3515.             System functions 4 and 5 may have such broad application  that
  3516.        the  extent  of  on-line  and off-line treatment must be considered
  3517.        carefully by each Administration in relation to its requirements.
  3518.  
  3519.  
  3520.        3       List of MML functions
  3521.  
  3522.  
  3523.             Table 2/M.250 represents the list of MML  functions  necessary
  3524.        to  control  the system functions given in Table 1/M.250. The table
  3525.        presents the functions at their  most  basic  level  and  does  not
  3526.        necessarily  represent  the  actual  command  structure of any real
  3527.        implementation of the man-machine language.
  3528.  
  3529.             Each of the MML functions in the  list  could  be  implemented
  3530.        either  by providing a separate and distinctive command, or several
  3531.        MML functions of the list could be implemented by means of a single
  3532.        command.
  3533.  
  3534.             For example, in one implementation of MML,  a  single  command
  3535.        CREATE,  in  which  the  object  to be created will be defined as a
  3536.        parameter of the command (e.g. A MEASUREMENT), will perform  inter-
  3537.        nally precisely the same activities and functions as another imple-
  3538.        mentation which provides a separate and distinctive command for the
  3539.        creation  of  each  object (e.g. CREATE A MEASUREMENT). In this way
  3540.        the list of MML functions can be said to be system independent,  as
  3541.        each  function exists either implicitly or explicitly regardless of
  3542.  
  3543.  
  3544.  
  3545.  
  3546.  
  3547.  
  3548.  
  3549.  
  3550.  
  3551.        the methods of implementation chosen for particular systems.
  3552.  
  3553.             The list of MML functions shown in Table 2/M.250 have a  wider
  3554.        application  than  the  maintenance  of circuits between exchanges.
  3555.        Many of the functions identified are common  to  a  wide  range  of
  3556.        maintenance  and  operational requirements, and the contents of the
  3557.        table should be considered  whenever  changes  to  the  maintenance
  3558.        strategy  and  procedures  are  necessitated by the introduction or
  3559.        extension of MML in the maintenance field.
  3560.  
  3561.  
  3562.        4       Terminology
  3563.  
  3564.  
  3565.             The MML terminology to be used for maintenance  is  a  subject
  3566.        for further study.
  3567.  
  3568.             Note  - Recommendation  Z.341,  Glossary  of  terms  (for  the
  3569.        man-machine  language),  suggests that a function may be considered
  3570.        as an "action upon an object", e.g. create a routine test.  Actions
  3571.        e.g.     "CREATE"    are    defined    in    the    Appendix I   to
  3572.        Recommendation Z.333  which  describes  the  methodology  for   the
  3573.        specification  of a man-machine interface. Objects and their modif-
  3574.        iers, e.g. routine test, are the subject of further study.
  3575.  
  3576.                                  H.T. [T2.250]
  3577.                                   TABLE 2/M.250
  3578.                              List of MML functions
  3579.  
  3580.  
  3581.  
  3582.  
  3583.  
  3584.  
  3585.  
  3586.  
  3587.  
  3588.  
  3589.  
  3590.  
  3591.  
  3592.  
  3593.  
  3594.  
  3595.  
  3596.  
  3597.  
  3598.  
  3599.  
  3600.  
  3601.  
  3602.  
  3603.  
  3604.  
  3605.  
  3606.  
  3607.  
  3608.  
  3609.  
  3610.  
  3611.  
  3612.  
  3613.  
  3614.  
  3615.  
  3616.  
  3617.        _______________________________________________________________________________________________________
  3618.                                         1.1                                     Create a routine test
  3619.                                         1.2                                     Create a routine measurement
  3620.                                         1.3                                     Create a test set
  3621.                                         1.4                                     Create a measurement set
  3622.                                         1.5                                     Create a list of circuits
  3623.                                         1.6                                     Create a time data list
  3624.                                         1.7                                     Create an output media list
  3625.                                         1.8                                     Delete a test set
  3626.                                         1.9                                     Delete a measurement set
  3627.                                         1.10                                    Delete a list of circuits
  3628.                                         1.11                                    Delete a time data list
  3629.                                         1.12                                    Delete an output media list
  3630.                                         1.13                                    Interrogate a test
  3631.                                         1.14                                    Interrogate a test set
  3632.                                         1.15                                    Interrogate a measurement
  3633.                                         1.16                                    Interrogate a measurement set
  3634.                                         1.17                                     {
  3635.                            Interrogate a list of circuits
  3636.                                           }
  3637.                                         1.18                                    Interrogate a time data list
  3638.                                         1.19                                     {
  3639.                           Interrogate an output media list
  3640.                                           }
  3641.                                         1.20                                    Activate a routine test
  3642.                                         1.21                                     {
  3643.                            Activate a routine measurement
  3644.                                           }
  3645.                                         1.22                                    Activate an on-demand test
  3646.                                         1.23                                     {
  3647.                           Activate an on-demand measurement
  3648.                                           }
  3649.                                         1.24                                    Deactivate a routine test
  3650.                                         1.25                                     {
  3651.                           Deactivate a routine measurement
  3652.                                           }
  3653.                                         1.26                                     {
  3654.                         Output the results of a routine test
  3655.                                           }
  3656.                                         1.27                                     {
  3657.                      Output the results of a routine measurement
  3658.                                           }
  3659.                                         2.1                                      {
  3660.         Interrogate the status of a circuit(s) and/or associated equipment(s)
  3661.                                           }
  3662.                                         2.2                                      {
  3663.                           Input trouble or restoral report
  3664.                                           }
  3665.                                         3.1                                      {
  3666.                        Remove a circuit (or group of circuits)
  3667.                                           }
  3668.                                         3.2                                      {
  3669.                       Restore a circuit (or group of circuits)
  3670.                                           }
  3671.                                         4.1                                      {
  3672.                        Activate maintenance analysis functions
  3673.                                           }
  3674.  
  3675.  
  3676.  
  3677.  
  3678.  
  3679.  
  3680.  
  3681.  
  3682.  
  3683.                                         4.2                                      {
  3684.                       Deactivate maintenance analysis functions
  3685.                                           }
  3686.                                         4.3                                     Change analysis thresholds
  3687.                                         4.4                                     Change analysis groups
  3688.                                         4.5                                      {
  3689.                            Interrogate analysis thresholds
  3690.                                           }
  3691.                                         4.6                                     Interrogate analysis groups
  3692.                                         4.7                                      {
  3693.                        Allow, inhibit, initialize a threshold
  3694.                                           }
  3695.                                         5.1                                      {
  3696.                           Sort trouble or restoral reports
  3697.                                           }
  3698.                                         5.2                                     Move reports to other files
  3699.                                         5.3                                     Browse report files
  3700.                                         5.4                                     Create summary reports
  3701.                                         5.5                                     Activate a report on demand
  3702.                                         5.6                                     Activate a report on routine
  3703.                                         5.7                                      {
  3704.                            Deactivate a report on routine
  3705.                                           }
  3706.                                         5.8                                     Change report classification
  3707.                                         5.9                                     Output summary reports
  3708.                                         5.10                                    Route output of reports
  3709.        _______________________________________________________________________________________________________
  3710.  
  3711.       |
  3712.       |
  3713.       |
  3714.       |
  3715.       |
  3716.       |
  3717.       |
  3718.       |
  3719.       |
  3720.       |
  3721.       |
  3722.       |
  3723.       |
  3724.       |
  3725.       |
  3726.       |
  3727.       |
  3728.       |
  3729.       |
  3730.       |
  3731.       |
  3732.       |
  3733.       |
  3734.       |
  3735.       |
  3736.       |
  3737.       |
  3738.  
  3739.  
  3740.  
  3741.  
  3742.  
  3743.  
  3744.  
  3745.  
  3746.  
  3747.  
  3748.  
  3749.  
  3750.  
  3751.  
  3752.  
  3753.  
  3754.  
  3755.  
  3756.  
  3757.  
  3758.  
  3759.  
  3760.  
  3761.  
  3762.  
  3763.                                                                              |
  3764.                                                                              |
  3765.                                                                              |
  3766.                                                                              |
  3767.                                                                              |
  3768.                                                                              |
  3769.                                                                              |
  3770.                                                                              |
  3771.                                                                              |
  3772.                                                                              |
  3773.                                                                              |
  3774.                                                                              |
  3775.                                                                              |
  3776.                                                                              |
  3777.                                                                              |
  3778.                                                                              |
  3779.                                                                              |
  3780.                                                                              |
  3781.                                                                              |
  3782.                                                                              |
  3783.                                                                              |
  3784.                                                                              |
  3785.                                                                              |
  3786.                                                                              |
  3787.                                                                              |
  3788.                                                                              |
  3789.                                                                              |
  3790.  
  3791.  
  3792.  
  3793.  
  3794.  
  3795.  
  3796.  
  3797.  
  3798.  
  3799.  
  3800.  
  3801.  
  3802.  
  3803.  
  3804.  
  3805.  
  3806.  
  3807.  
  3808.  
  3809.  
  3810.  
  3811.  
  3812.  
  3813.  
  3814.  
  3815.                                                                                                              |
  3816.                                                                                                              |
  3817.                                                                                                              |
  3818.                                                                                                              |
  3819.                                                                                                              |
  3820.                                                                                                              |
  3821.                                                                                                              |
  3822.                                                                                                              |
  3823.                                                                                                              |
  3824.                                                                                                              |
  3825.                                                                                                              |
  3826.                                                                                                              |
  3827.                                                                                                              |
  3828.                                                                                                              |
  3829.                                                                                                              |
  3830.                                                                                                              |
  3831.                                                                                                              |
  3832.                                                                                                              |
  3833.                                                                                                              |
  3834.                                                                                                              |
  3835.                                                                                                              |
  3836.                                                                                                              |
  3837.                                                                                                              |
  3838.                                                                                                              |
  3839.                                                                                                              |
  3840.                                                                                                              |
  3841.                                                                                                              |
  3842.  
  3843.  
  3844.  
  3845.  
  3846.  
  3847.  
  3848.  
  3849.  
  3850.  
  3851.  
  3852.  
  3853.  
  3854.  
  3855.  
  3856.  
  3857.  
  3858.  
  3859.  
  3860.  
  3861.  
  3862.  
  3863.  
  3864.  
  3865.  
  3866.  
  3867.  
  3868.  
  3869.                                                          Table [2.250], p.
  3870.  
  3871.  
  3872.  
  3873.  
  3874.  
  3875.  
  3876.  
  3877.  
  3878.  
  3879.  
  3880.  
  3881.  
  3882.  
  3883.  
  3884.  
  3885.  
  3886.  
  3887.  
  3888.  
  3889.  
  3890.  
  3891.  
  3892.  
  3893.  
  3894.  
  3895.  
  3896.  
  3897.  
  3898.  
  3899.  
  3900.  
  3901.  
  3902.  
  3903.  
  3904.