Internet Standards/CD2.mdf/ccitt/1992/m/m140.asc

Text File | 1991-12-30 | 146KB | 5,681 lines

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Revised Recommendation M.140

DESIGNATION OF INTERNATIONAL CIRCUITS, GROUPS, GROUP AND LINE LINKS,
  DIGITAL PATHS, DATA TRANSMISSION SYSTEMS AND RELATED INFORMATION

Explanation

       Designation of international routes*: circuits, groups, blocks etc.  are
of great importance for identification and information. Technical developments
specially due to digital technology have brought a much  greater  variety  of
techniques and allow for a more efficient use of equipment. Information on the
applied techniques are of great interest to the staff working in the field of
maintenance and  operation.  Operational  conditions  nowadays  can  be  more
complicated than before, e.g. as a consequence of more competition in the field
of telecommunication. On the other hand automated file handling is a necessity
for the administration and standardization of designations is an important factor
to enable this. To cover the need for standardized designations which are easy to
handle but can give precise information, designations have been built up from two
layers:

       -    layer 1 provides the unique identification = the Designation.

       -    layer 2 provides the necessary additional information which must be
            known at both terminations of the routes: the Related Information.

       If administrations need more route data to be stored, they are free to
create independently or bilaterally a 3rd layer for which no standardization is
intended for the time being.

       The general format of layer 1 for the designations  of  all  types  of
international routes is as follows:
┌───────────┬────────────────────────────────────────────────────────────────┐
│format     │ Town A/ suffix - Town B/ suffix    Function code  Serial number│
├───────────┼─────┬─┬───────┬─┬────┬─┬───────┬─┬───────────────┬─────────────┤
│number of  │  <12│1│   <3  │1│<12 │1│ <3    │1│      <6       │   <4        │
│characters │     │ │       │ │    │ │       │ │               │             │
└───────────┴─────┴─┴───────┴─┴────┴─┴───────┴─┴───────────────┴─────────────┘
       The suffix is  especially  meant  for  international  public  switched
circuits. It is optional for international fixed circuits, groups, group links,
digital blocks and paths and data transmission systems. It supplies  detailed
information on the termination of the routes. The  first  part,  the  traffic
relation, presents origin and destination of a route. The function code shows the
type of route whilst the serial number counts the routes with the same traffic
relation and same function code.  If  a  town  name  exceeds  12  characters,
administrations should supply a suitable abbreviation which should be unique.
If identical place names occur in different countries, and if confusion is likely
to arise, the administrations concerned should agree to identify the country in
the circuit designation by adding after the place name a three-letter country
code as defined in ISO 3166. This country code must be included within the 12
characters of town name, if necessary by providing an abbreviation of the town
name. The serial number is to be written without leading zero's.

───────────
*  "Route" covers here all types of telecommunication connections, circuits,
   groups, blocks, etc.



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       The general format for layer 2 (Related Information) is as follows:

       1.   ...., ....;

       2.   ...., ....;

       3.   ...., ....;

                .

                .

                .

                .

       The numbers indicate the various items. Each item provides information on
the route, e.g. operational: operating companies and control station, etc., or
technical: analogue/digital, use of special equipment, etc. The items provide
flexibility in designation information because they can be extended in the future
if there is a need.


       This Recommendation on designations contains the sections:

       1)   Designations of international public switched circuits.

       2)   Related information for international public switched circuits.

       3)   Designations of fixed (non-switched) circuits.

       4)   Related information for fixed circuits.

       5)    Designations  of   international   groups   (bidirectional   and
            unidirectional).

       6)   Designations of international group links.

       7)   Related information for international groups and group  and  line
            links.

       8)   Designations of international digital blocks  (bidirectional  and
            unidirectional).

       9)   Designations of international digital paths.

       10)  Designation of the international mixed analogue/digital transmission
            network.

       11)  Designations of international data transmission systems.

       12)  Related information for international digital blocks, digital paths
            and data transmission systems.

       At the end of the Recommendation, an annex gives the reference paragraph



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numbers for the various types of routes.

Note - For the definitions of unidirectional and bidirectional, as for those of one-
way and both-way, reference is made to Recommendation E.600 (Definitions 14.02  -
14.08).





















































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Implementation

       It is recommended to apply the new designation types for  newly  installed
routes starting on 1 January 1990 (or earlier after agreement of  administrations
involved).

       Each time when a new route (circuit, block, data transmission system, etc.)
is being installed the route gets the new designation.  The  Related  Information
required for maintenance and operation on the route is gathered and put into a record
for that route. For circuits, reference is made to Recommendations M.570 and M.1045
"Preliminary exchange of information".

       The same procedure should be used for setting up other routes: digital blocks
and paths (ref. Recommendation M.465) and data transmission systems
(ref. Recommendations M.1350 and M.1370). Existing designations should be converted
gradually but at the latest on 1 January 1994. For the conversion, the administration
which has control station responsibility will supply a proposal which contains the
new designation (if this is different) and the Related Information (so layer 1  +
layer 2).

       Administrations are urged to keep the Related Information up to date. To that
end, the administration  where  the  change  originates  will  inform  the  other
administrations involved.

1.     Designations of international public switched circuits

1.1    General

       The format of the designation of public switched circuits is:

┌───────────┬──────────────────────────────────────────────────────────────────┐
│format of  │ Town A/International-Town B/International    Function    Serial   │
│designation│          Exchange             Exchange         Code      Number  │ │
      │            Suffix                 Suffix                                │
├───────────┼──────────────────────────────────────────────────────────────────┤
│signs      │       Slash         Hyphen  Slash         Space     No Space      │
├───────────┼──────────────────────────────────────────────────────────────────┤
│number of  │ < 12  1 < 3           1 < 12 1 < 3          1    1       <        │
│characters │                                                                   │
└───────────┴──────────────────────────────────────────────────────────────────┘

















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Traffic relation

       -    Town A and B

       (Maximum 12 characters or space)(Note 1) refers to the names of the two towns in
which the international exchanges of the circuit are located.  The place names in all
types of designation should always be written in Roman characters taking the official
name of a town as used in the country to which it belongs.  In the case of identical
place names in different countries, the administrations should agree to make  the
place names unique.

       -    International Exchange Suffix

       (Maximum three alpha-numeric characters). The  international  exchange  is
indicated by letters, digits or a combination. The suffix will refer to the whole
exchange (building or to a part of it)(Note 2). It will be chosen by the administration
(Notes 3 and 4).

Function code

       (One or two alphabetical characters). The function code indicates the type of
circuit.

Serial number

       (Maximum  four  numeric  characters).  Serial  numbering  starts  anew  if
there is a difference in:

       -    Town A or town B

       -    International Exchange Suffix

       -    Function Code.








Note 1 - If the name of the town exceeds 12 characters the responsible administration
will supply an appropriate abbreviation, which should be unique.

Note 2 - In the example given in the figure there may be only one suffix or three to
be decided by the administration.

Note 3 - The three alpha-numeric characters make it possible to include carrier's
name information in the suffix, e.g. Tokyo/SJK the international exchange in Tokyo-
Shinjuku where the K in the suffix reflects the responsible carrier KDD.

Note 4 - The different companies operating in the same town have to agree on  the
suffices they use, so that they are different.




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1.2    Telephone type circuits

1.2.1  General

       Possible function codes are:

       M: for manual telephone circuits;

       Z:  for  automatic  and  semi-automatic  telephone  circuits  in   one-way
    operation;

       B: for both-way telephone circuits.

Serial number

       (Maximum four numeric characters). Serial numbering starts  anew  if
       there is a difference in:

       -    Town A or town B

       -    International Exchange Suffix(Note 5)

       -    Function code.

Note 5 - On bilateral agreement administrations may wish to apply  a  serial
number on a town-to-town basis rather than on an exchange-to-exchange basis.

1.2.2  Telephone circuits used in manual operation

       These circuits are designated as follows:

       -    The terminal points of the circuit are arranged in  alphabetical
            order;

       -    the function code is: M.

Example:

       The first telephone circuit for manual operation  between  London
       Keybridge and Paris Bagnolet is designated:

       London/KB-Paris/BAG M1.
















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1.2.3  One-way telephone circuits used for semi-automatic  or  automatic
       operation

       These circuits are designated as follows:

       -    the terminal points of the circuits are arranged in  the  order
            according to the direction of operation of the circuit;

       -    the function code is: Z.

Serial numbering:

       Circuits operated in the direction corresponding to  the  alphabetical
       order of the terminations should have odd numbers. Circuits operated in
       the direction corresponding to an inverse alphabetical  order  of  the
       terminations should have even numbers(Note 6).

Note 6 - On bilateral agreement administrations may wish to  apply  continuous
serial numbering on Z + B circuits.

Examples:

       The 11th circuit operated in the London Mollison to  Montreal  1TE
       direction (alphabetical order of towns) is designated:

       London/SM-Montreal/1TE Z21.

       The ninth circuit operated in the Montreal 1TE to  London  Mollison
       direction (inverse alphabetical order of towns) is designated:

       Montreal/1TE-London/SM Z18.

1.2.4  Both-way telephone circuits used for semi-automatic  or  automatic
       operation

       These circuits are designated as follows:

       -    the terminal points of the circuit are arranged  in  alphabetical
            order;

       -    the function code is: B.

Example:

       The first both-way circuit between London Kelvin and New York  24  is
       designated:

       London/J-New York/24 B1.










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1.3    Circuits used for switched telex and telegraph service

       See CCITT Recommendation R.70.

1.4    Circuits in the international public switched data network

       These circuits are designated as follows:

       -    the terminations of the circuit are arranged  in  alphabetical
            order;

       -    the function code is: XD.

Example:

       The first international public switched data circuit between Oslo  A  and
       Stockholm HYX is designated:

       Oslo/A-Stockholm/HYX XD1.

1.5    Related Information

       The additional information on public switched circuits is covered by the
following items:

       1)   urgency for restoration;

       2)   terminal countries;

       3)   carriers' names;

       4)   control and subcontrol station(s);

       5)   fault report points;

       6)   routing;

       7)   association;

       8)   equipment information;

       9)   use;

       10)  transmission medium information;

       11)  composition of transmission;

       12)  bandwidth or bit rate;

       13)  signalling information.

       The various items will be dealt with in section 2, "Related information for
international public switched circuits".




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2      Related information for international public switched circuits

2.1    Urgency for restoration

       This item supplies information on the urgency of restoration of the circuit
based upon bilateral agreement between the terminal administrations.

Format:

       1.   xxx .... xx; (maximum 10 characters).

       Illustration:

       a)   If the priority is top: 1

            If the priority is second: 2

            If the priority is third: 3

       or

       b)   If repair is required within, e.g., 24 hours: < 24h

       or

       c)   If no urgency has to be indicated: -

2.2    Terminal countries

       This item presents the countries in which the circuit is terminating.

Format:

       2.   XXX, YYY; (three characters for each).
Specification:

       XXX: code for country of town A

       YYY: code for country of town B

Remark:

       The codes are according to ISO Standard 3166 "Specification for codes for
the representation of names of countries".

Example:

       for the circuit London/KB-Tokyo/SJK Z101:

       2.   GBR,JPN;

2.3    Names of administrations or carriers

       This item records the names of the carriers which operate the circuit.




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Format:

       3.   YYYYYY, ZZZZZZ; (maximum six characters for each).

Specification:

       YYYYYY: code for company operating in town A

       ZZZZZZ: code for company operating in town B

Example:

       for the circuit London/KB-Tokyo/SJK Z101 operated by BTI and KDD.

       3.   BTI, KDD;

2.4    Control station (sub-control station(s))

       This item lists the appointed control station  and  sub-control  stations
(according to Recommendations  M.80 and M.90).

       Further   details   about   the   stations   can   be   found   in    the
List of Contact Points (Recommendation M.93).

Format:

       4.   CS  : designation of control station,

            SCS1: designation of sub-control station,

            SCS2: designation of sub-control station,

              .       .            .            .

                 .       .            .            .

               .       .            .            .

            SCSn: designation of sub-control station;

Specification:

       CS  : designation of the control station,

       SCS1: designation of the terminal sub-control station,

       SCS2: if applicable: other sub-control stations,

       SCSn: etc. have to be placed in the geographical order according  to  the
         traffic relation;

Example:

       for the circuit New York/10-Stockholm/1 B1 where New York  is  the
       control station and sub-control stations are in London and Stockholm:



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       4.   CS  : New York,
            SCS1: Stockholm,
            SCS2: London.

2.5    Fault report points

       This item presents the names of both fault report points  on  the
circuit.

       Further information about the fault report points can be found in the List
of Contact Points (Recommendation M.93).

Format:

       5.   Designation of fault report point, designation of fault report point;

Specification:

       The first fault report point is the fault report point  belonging  to
       country of town A.

       The second fault report point to that of the country of town B.

Example:

       For the circuit London/M-Reims/IP1 Z999 with fault report  points  in
       London M and Reims XRE:

       5.   London/M, Reims/XRE;

2.6    Routing

       This item shows the international primary groups or primary  block  and
channel number which carry the circuit.

       If there are more  than  one,  the  groups  or  blocks  appear  in  the
geographical order from town A to town B.

Format:

       6.    Designation  of  an  international  primary  group   or   primary
            block/channel number, designation of a primary group/channel number,
            .........., designation of a primary group/channel number;

Note - Primary groups or blocks can be unidirectional as well. Two consecutive
unidirectional groups or blocks are separated by a "+" sign instead of a comma.

Example:

       For a circuit Paris/ARC-Santiago/1 Z27:

       6.   London-Paris 1204/4, Paris-(MU) 1202/2+Santiago-(MU) 1203/3;





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2.7    Association

       This item informs whether there are associated circuits and if  so,  of
which nature.

Format:

       7.    Association code: Designation of associated circuit;

Specification:

       If the circuit has a reserve circuit the association code is:
       S followed by the function code and the serial number of  the  principal
       circuit.

       If the circuit is a reserve circuit: the association code is:
       Function code followed by S and the serial number of  the  reserve
       circuit.

Example 1:

       7.   ZS13: Roma/AS1-Zuerich/SEL T1

Read:

       The actual circuit Z13 is a reserve circuit for the  circuit  Roma/AS1-
Zuerich/SEL T1.

2.8    Equipment information

       This item records any equipment in the circuit which  requires  special
maintenance attention.

Format:

       8.   XX, XX, XX, XX, XX;

Specification:

       If the circuit has been routed via analogue  circuit  multiplication
       equipment: AM

       If the circuit has been routed via digital  circuit  multiplication
       equipment

       -    if reduced bit rate encoding is used: RB

       -    if speech interpolation is used: SI

       If the circuit has a compandor: CO

       If the circuit has an echo suppressor: ES

       If the circuit has an echo canceller: EC




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       If the circuit has an echo suppressor in terminal country of town A and an
       echo canceller in terminal country of town B: ES, EC (any combination of EC
       and ES is possible)
       If the circuit is a bearer circuit: BC

       If the circuit is a derived circuit: DC

Note 1 - If there is a need to record an additional special equipment,  the  free
places for a code are available for this purpose. They can be used after bilateral
agreement between the administrations. The codes must be unique and shall have two
characters.

Note 2 - A bearer circuit refers to the circuit type that is continued to be provided
in the case of a breakdown of the circuit multiplication equipment. For a derived
circuit this is not the case.

2.9    Use

       This item supplies information on the usage of the circuit. It is concerning
the role of the circuit in the traffic (e.g., belonging to a final route) and the
usage by the user.

Format:

       9.   XX, YYYY; (maximum seven characters)

Specification:

       XX refers to the type of traffic carried by the circuit:

       -    if it belongs to a final group of circuits: FN

       -    if it belongs to a overflow group of circuits: OF

       -    if it belongs to a transit group of circuits: TR

       -    if the information is not known: -

       YYYY refers to the use of the circuit:

       in the case where a public telephone circuit is used for phototelegraphy or
       facsimile: F

2.10   Transmission medium information

       This item identifies whether a satellite is involved in the routing of the
circuit.

Format:

       10. ST; or -;

Specification:

       if the circuit has been routed via satellite: ST



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       if the circuit is not being routed via satellite: -

Example:

       For the circuit Amsterdam/2H-New York/24 Z33 routed  partly  via
       satellite:
       10. ST;

2.11   Composition of the transmission

       This item shows the type of transmission on the circuit.

Format:

       11. A; N; or C;

Specification:

       if the transmission is analogue: A

       if the transmission is digital: N

       if the transmission is mixed analogue/digital: C

2.12   Bandwidth or bit rate

       This item shows the bandwidth (in the case of an analogue  or  mixed
circuit) or the bit rate (in the case of a digital circuit).

Format:

       12. xxxx.x Hz; or kHz; or MHz; bit/s; or kbit/s;  or  Mbit/s;
       (leading zeros, and if the decimal is a zero, this decimal and
       the decimal point may be omitted).

       Rule for the notation of figures:

       if the figure is up to 999, use Hz, bit/s;

       if the figure is between 1000 and 9 999 999, use kHz, kbit/s;

       if the figure is 10 000 000 or more, use MHz, Mbit/s.

Specification:

       if the circuit is analogue or mixed: the bandwidth in Hz, kHz, MHz;

       if the circuit is digital: the bit rate in bit/s, kbit/s, Mbit/s.

2.13   Signalling information

       This item presents the signalling information that  applies  to  the
circuit.




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Format:

       13.  xx....xx; (max. 20 characters)

Specification:

       if the CCITT Signalling System R2 is applied: R2

       if the CCITT Signalling System R2 digital is applied: R2D

       if the CCITT Signalling System No. 4 is applied: C4

       if the CCITT Signalling System No. 5 is applied: C5

       if the CCITT Signalling System No. 6 is applied: C6, xxx/yy

       xxx/yy refers to band and circuit number respectively

       if the CCITT Signalling System No. 7 is applied: C7, xxxx, Y-YYY-Y,
         Z-ZZZ-Z
       xxxx refers to the Circuit Identification Code (CIC)

       Y-YYY-Y refers to the International Signalling Point Code  (ISPC)  for
       town A/international exchange

       Z-ZZZ-Z refers to the ISPC for town B/international exchange

Example:

       For a circuit with C6-signalling type:

       being the seventh circuit in band number 32

       13.  C6, 032/06; (circuit counting starts at 0)

Full example for the designation information of a public  switched  telephone
circuit

       The circuit is the 604th both-way telephone circuit between Sherman Oaks
4ES and Tokyo Shinjuku, operated by AT&T and KDD. The signalling type is CCITT
No. 6 with band/circuit number assigned as 000/03. The control station and sub-
control station of the circuit are Sherman Oaks-transmission station 1 and Tokyo-
transmission station 1 respectively. The two stations are also the fault report
points of the circuit. The circuit has been routed on fourth channel of the first
group between Sherman Oaks and Ibaraki which is routed via satellite and has been
connected to digital blocks in domestic networks.
The designation

       Sherman Oaks/4ES-Tokyo/SJK B604

Related information

       1.   2;

       2.   USA, JPN;



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       3.   ATT, KDD;

       4.   CS: Sherman Oaks/TS1,
               SCS1: Tokyo/TS1;

       5.   Sherman Oaks/TS1, Tokyo/TS1;

       6.   Ibaraki-Sherman Oaks 12C01/4;

       7.   -;

       8.   -;

       9.   -;

       10.  ST;

       11.  C;

       12.  3.4 kHz;

       13.  C6, 000/03;

3.     Designations of international fixed (non-switched) circuits

3.1    General

       This chapter comprises the sections on designations of:

3.2    Leased circuits

3.3    Public fixed circuits
                                                                                The
format of the designation of fixed circuits is:
┌───────────┬──────────────────────────────────────────────────────────────────┐
│format of  │ Town A/Transmission  -Town B/Transmission     Function      Serial│
│designation│        station(Note 1)       station(Note 1)  code         Number│ │
│        suffix                suffix                              │ │           │
                                                             │   │              │
(Optional)                       (Optional)                                     │
├───────────┼──────────────────────────────────────────────────────────────────┤
│           │                                                                   │
│signs      │    Slash         Hyphen    Slash       Space       No Space       │
├───────────┼──────────────────────────────────────────────────────────────────┤
│           │                                                                   │
│number of  │ <12  1 < 3          1 < 12 1  < 3         1  1-4        < 4       │
│characters │                                                                   │
└───────────┴──────────────────────────────────────────────────────────────────┘









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Traffic relation

       Towns A and B possibly with a transmission  station  suffix  identify  the
terminal points of the circuit.

       The identification of the terminal  point  is  up  to  the  administration
concerned. In the case that a town name exceeds the maximum length of 12 characters,
the administration should supply a suitable abbreviation which  must  be  unique.
Transmission station suffix (maximum 3 characters) is an optional field which may be
used to further identify the terminal point, e.g. when there is more than one carrier
operating in the town. The necessity for a suffix and its form should be decided by
the administration operating the circuit in the town concerned.

Note 1 - For some circuits the international exchange may be more suitable (see the
examples in  3.3.9 and 3.2.15.

Function code

       (Maximum four characters) identifies the type of the circuit; see 3.2 and 3.3
below.

Serial number

       (Maximum four digits). There should be a separate serial numbering series for
each traffic relation and function code. In case of more than one carrier in the town
the serial numbering will be on a transmission station to transmission station basis.

       The layer 1 designations of the different categories of leased circuits are
given below. In special cases in which CCITT Recommendations do not apply, agreement
should be reached between the terminal administrations.

3.2    International leased circuits

3.2.1  General

       Leased circuits are fixed circuits  for  private  services  or  particular
purposes. They are distinguished by the letter P.

       The layer 1 format for leased circuits is as stated in 3.1.

       Possible function codes are:

       P  : for analogue leased circuits used wholly for telephony

       TP : for analogue leased circuits used for voice-frequency telegraphy

       TDP: for analogue leased circuits used for TDM-telegraphy

       DP : for analogue leased circuits used wholly for data transmission

       FP : for analogue leased circuits used wholly for phototelegraphy or
               facsimile






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       RP : for analogue unidirectional sound-programme leased circuits

       RRP: for analogue reversible sound-programme leased circuits

       VP : for analogue unidirectional television programme leased circuits

       VVP: for analogue reversible television programme leased circuits

       XP : for analogue leased circuits used for a multiple kind of
               transmissions

       NP : for digital leased circuits.

Note - In case of leased circuits connecting three or more locations the letter M
should follow these function codes.

3.2.2  Analogue leased circuits used for telephony

       The terminal points of the circuits are arranged in alphabetical order.

       The function code is: P.

Example:

       The first analogue leased circuit used for telephony between  Paris  and
       Wellington, New Zealand, is designated:

       Paris-WellingtoNZL P1

3.2.3  Analogue leased circuits used for telegraphy

3.2.3.1Voice-frequency telegraphy

       The terminal points of the circuits are arranged in alphabetical order.  The
function code is: TP.

Example:

       The first analogue leased circuit used for voice-frequency telegraphy between
Bern 1RS and New York 1RC is designated:

       Bern/1RS-New York/1RC TP1.

3.2.3.2TDM-telegraphy

       The terminal points of the circuits are arranged in alphabetical order.  The
function code is: TDP.

Example:

       The third analogue leased circuit used for TDM-telegraphy between London and
Montreal is designated:

       London-Montreal TDP3.




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3.2.4  Leased telegraph circuits

       See Recommendation R.70.

3.2.5  Analogue leased circuits used for data transmission

       The terminal points of the circuits are arranged in alphabetical order.

       The function code is: DP.

Example:

       The third analogue leased circuit used for data transmission between London
and Paris is designated:

       London-Paris DP3.

3.2.6  Analogue leased circuits used for phototelegraphy or facsimile

       The terminal points of the circuits are arranged in alphabetical order.  If
these circuits are different from P-circuits the function code is: FP.

Example:

       The second analogue leased circuit used for phototelegraphy between London
and Paris is designated:

       London-Paris FP2.

       If  normal  P-circuits  are  used,  then  these  circuits  are  designated
accordingly.

3.2.7  Analogue leased circuits used for sound-programme transmission

3.2.7.1Analogue leased unidirectional sound-programme circuit

       The terminal points of the circuits are arranged in the order corresponding
to the direction of transmission (instead of alphabetically if this is different).

       The function code for these circuits is: RP.

Serial numbering:

       Circuits which transmit in the direction corresponding to the alphabetical
order of the terminals should have odd serial  numbers,  circuits  in  the  other
direction even numbers.

Examples:

       The first leased sound-programme circuit transmitting in  the  direction
       Montreal to Wellington (New Zealand) will be designated:

       Montreal-WellingtoNZL RP1





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                               - 20 -
                            AP IX-32-E


       The first leased sound-programme circuit transmitting in  the  direction
       Wellington (New Zealand) to Montreal will be designated:

       WellingtoNZL-Montreal RP2

3.2.7.2Analogue leased reversible sound-programme circuits

       The terminal points of the circuits are arranged in alphabetical order.

       The function code is: RRP.

Example:

       The first leased circuit with  reversible  sound-programme  transmission
between Montreal and Wellington (New Zealand) is designated:

       Montreal-WellingtoNZL RRP1

3.2.8  Analogue leased circuits used for television transmission

3.2.8.1Analogue leased unidirectional television programme circuits

       The terminal points of the circuits are arranged in the order corresponding
to the direction of transmission (instead of alphabetically if this is different).

       The function code is: VP.

       Circuits which transmit in the direction corresponding to the alphabetical
order of the terminals should have odd serial numbers, circuits  in  the  other
direction even numbers.

Example:

       The first leased television programme circuit transmitting in the direction
Wellington (New Zealand) to Montreal will be designated:

       WellingtoNZL-Montreal VP2

3.2.8.2Analogue leased reversible television programme circuits

       The terminal points of the circuits are arranged in alphabetical order.
       The function code is: VVP.

Example:

       The first circuit with reversible television transmission between Montreal
and Wellington (New Zealand) is designated:

       Montreal-WellingtoNZL VVP1









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3.2.9  Leased circuits used for digital video transmission

       These circuits are designated as digital leased circuits (irrespective of
the use) ref. 3.2.15 and 3.2.16.

3.2.10 Analogue leased  circuits  connecting  circuit  multiplication  terminal
       equipments at renters' premises

       These circuits are designated as normal leased circuits. The information
that these circuits connect circuit multiplication terminal  equipment  can  be
recorded under item 9. "Use" of Related Information (see  4.9).

       Circuits routed via circuit multiplication equipment are also designated as
normal circuits. The multiplication equipment appears under item 8.  "Equipment
information" of Related Information (see  4.8).

3.2.11 Analogue leased circuit used for transmission other than those designated
       in paragraphs above or used for combinations of transmissions

       In this category are circuits used for different transmissions at different
times or circuits in which the bandwidth is divided into two or more bands, thus
providing two or  more  derived  circuits  which  may  be  used  for  different
transmissions.

       The terminal points of the circuits are arranged in alphabetical order.

       The function code is: XP.

Example:

       Bruxelles-Paris XP8.

3.2.12 Analogue leased circuits connecting three or more locations

       Into this category fall multiterminal  circuits  of  various  types  and
configurations. Each section of the circuit should have a unique designation. A
section is any part of the circuit which connects a branching point to either a
customer terminal or another branching point.

       International sections should use the designation described below.

       The terminal town points of each section are  arranged  in  alphabetical
order.

       The function code is formed by adding the letter M to the function codes
recommended in 3.2.2 to 3.2.11 above. This leads, in principle, to the function
codes PM, TPM, TDPM, DPM, FPM, RPM, RRPM, VPM, VVPM and XPM.

       The  association  between   sections   should   be   recorded   in   the
Related Information of each section under item 7 "Association" (ref.  4.7).








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                               - 22 -
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       Wholly national sections with national designations may be  included  if
bilaterally agreed.

Example:

       Let there be an international multiterminal  leased  circuit  connecting
Bruxelles and Paris (seventh PM circuit between Bruxelles and Paris) with branches
from Bruxelles to Edinburgh (first PM circuit on this relation) and from Bruxelles
to Aachen (fourth PM-circuit) and with an extension from Paris to Marseille.

       The international sections are designated:

       Bruxelles-Edinburgh PM1

       Aachen-Bruxelles PM4

       Bruxelles-Paris PM7.

3.2.13 Leased analogue groups, supergroups, etc.

       These groups, supergroups, etc. will receive a circuit designation.  The
additional information on the constitution of these circuits is to be  recorded
under Related Information under item 12 "Bandwidth or Bit rate" (ref.  4.12) and
under item 6 "Routing" ref.  4.6).

       The function codes are according to the relevant codes for circuits.

Example:

       A supergroup between renters' premises in London and Paris  for  data
       transmission being the 15th leased circuit for data transmission on this
       relation is designated:

       London-Paris DP15.

3.2.14 Leased analogue group, supergroup links

       These group, supergroup and line links will receive  a  circuit
designation. The additional information on the constitution  of  these
circuits is to be  recorded  in  Related  Information  under  item  12
"Bandwidth or Bit rate" (ref 4.12) and under item 6 "Routing" (ref. 4.6).

Example:

        A group link provided between renters' premises in London  and  Montreal
       devoted to data transmission being the  tenth  leased  circuit  for  data
       transmission on this relation is designated:

       London-Montreal DP10.

3.2.15 Digital leased circuits connecting two locations

       Designations given below also apply for leased digital  blocks  and
paths.




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                               - 23 -
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Remark:

       For digital leased circuits the use of the circuit will no  longer  be
taken into account for the designation: the use may change without notification
to the administration or may be unknown.

       The additional information concerning the bit rate is to be  found  in
Related Information under item 12 "Bandwidth or Bit rate" (ref.  4.12).

       The terminations of the circuit are placed in alphabetical order.

       The function code is: NP.

Example:

       The fifth digital leased circuit between Birmingham and  Toulouse  is
       designated:

       Birmingham-Toulouse NP5.

Note - Digital leased circuits consisting of a permanent switched connection.

       It may happen that a digital leased circuit has been routed via one  or
more international exchanges; in this case, they are designated as normal digital
leased circuits. However, in such cases, an international exchange suffix  may
replace transmission station suffix. The information on being permanently switched
is recorded in the Related Information under item  8  "Equipment  information"
(ref.  4.8).

Example:

       The 12th digital leased circuit between users' premises  connected  to
       transmission  station  TS2  in  Athens  and  permanently  switched  in
       international exchange IP2 in Reims is designated:

       Athinai/TS2-Reims/IP2 NP12.

3.2.16 Digital leased circuits connecting three or more locations

       Various types and configurations of multiterminal circuits fall into this
category. Each section of the circuit should have a unique designation.
A section is any part of the circuit which connects a branching point to either  a
customer terminal or another branching point (see also Recommendation M.1055).

       International sections should use the designation described below.

       The terminal points of each section are arranged in alphabetical order.

       The function code is formed by adding the letter M  to  the  function  code
recommended in 3.2.15, so the function code is: NPM.

       The association between sections should be recorded in the Related Information
of each section under item 7 "Association" (ref.  4.7).

       Wholly national sections with national  designations  may  be  included  if



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                               - 24 -
                            AP IX-32-E


bilaterally agreed.

























































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                               - 25 -
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Example:

       In an international digital multiterminal leased  circuit  connecting
       Oslo, London, Paris, Roma and Amsterdam,  the  international  section
       between Oslo and London (being the first NPM circuit on this relation)
       is designated:

       London-Oslo NPM1.

3.3    Fixed (non-switched) public circuits

3.3.1  General

       The designation format is according to section 3.1.

       Possible function codes are:

       R :  for a unidirectional sound-programme circuit

       RR:  for a reversible sound-programme circuit

       RK:  for telephone type circuits for  narrow-band  sound-programme
            transmission

       V :  for a unidirectional television circuit

       VV:  for a reversible television circuit

       F :  for a phototelegraphy or facsimile circuit

       T :  for circuits providing voice frequency telegraph links

       TD:  for circuits providing TDM telegraph systems

       D :  for data transmission circuits

       DL:  for circuits providing  transfer  links  for  common  channel
            signalling systems.

Remark

       Information on whether a sound-programme circuit forms  with  another
sound programme  circuit  a  stereophonic  pair  will  be  recorded  in  the
Related Information under item no. 7 "Association" (ref.  4.7).

3.3.2  Circuits used for sound programme transmission

3.3.2.1Circuits used for unidirectional sound-programme transmission

       These circuits are designated as follows:

       The terminations of the circuit are arranged in the order corresponding to
the direction of transmission (instead of alphabetically if this is different).

       The function code is: R.



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                               - 26 -
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Serial numbering:

       Circuits which transmit in the direction corresponding to the alphabetical
order of the terminals should have odd serial numbers. Circuits which transmit in
the direction corresponding to the inverse alphabetical order of  the  terminals
should have even serial numbers.

Example:

       The first circuit transmitting in the direction Wellington (New Zealand) to
       Montreal is designated:

       WellingtoNZL - Montreal R2.

3.3.2.2Circuits used for reversible sound-programme transmission

       These circuits are designated as follows:

       The terminations of the circuit are arranged in alphabetical order.

       The function code is: RR.

Example:

       The first circuit with reversible sound-programme  transmission  between
       London and Wellington (New Zealand) is designated:

       Montreal-WellingtoNZL RR1.

3.3.2.3Telephone  type  circuits  used  for  narrow  band  sound-programme
       transmission

       These circuits are designated as follows:

       In the traffic relation the terminals of the circuit are arranged in the
order corresponding to the direction of operation (instead of alphabetically if
this is different).

       The function code is: RK.

Serial numbering:

       Circuits  which  transmit  in  the  direction  corresponding  to   the
alphabetical order of the terminals should have odd serial numbers.  Circuits
which transmit in the direction corresponding to the inverse alphabetical order
of the terminals should have even serial numbers.

Example:

       The first telephone-type circuit set up for the  narrow-band  sound-
       programme transmission in the direction  from  Milan  to  Madrid  is
       designated:

       Milano-Madrid RK2.




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                               - 27 -
                            AP IX-32-E


3.3.3  Circuits used for television transmission

























































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                               - 28 -
                            AP IX-32-E


3.3.3.1Circuits used for unidirectional television transmission

       These circuits are designated as follows:

       In the traffic relation the terminations of the circuit are arranged in the
order corresponding to the direction of transmission (instead of alphabetically if
this is different).

       The function code is: V.

Serial numbering:

       Circuits which transmit in the direction corresponding to the alphabetical
order of the terminals should have odd serial numbers. Circuits which transmit in
the direction corresponding to the inverse alphabetical order of  the  terminals
should have even serial numbers.

Example:

       The first unidirectional television circuit transmitting  in  the
       direction Paris to Helsinki is designated:

       Paris-Helsinki V2.

3.3.3.2Circuits used for reversible television transmission

       These circuits are designated as follows:

       The terminations of the circuit are arranged in alphabetical order.

       The function code is: VV.

Example:

       The first reversible television transmission circuit between Tokyo TS1 and
       New Delhi is designated:

       New Delhi-Tokyo/TS1 VV1.

3.3.4  Circuits for digital audio and video transmission

       These circuits are designated according to the  data  transmission
systems, see section 11.

3.3.5  Telephone type circuits used for phototelegraphy or facsimile

       Circuits used for phototelegraphy or facsimile which are  different  from
normal telephone circuits will have the function code: F.

       The terminal points of the circuit are arranged in alphabetical order.

       If normal telephone circuits are used, they are  designated  accordingly.
Information about the usage may be recorded in the Related Information under item 9
"Use" (ref.  4.9).




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                               - 29 -
                            AP IX-32-E


Example:

       The first circuit for phototelegraphy between Koebenhavn and Tokyo:

       Koebenhavn-Tokyo F1.

3.3.6  Telephone type circuits used to provide voice frequency telegraph links

       These circuits are designated as follows:

       The terminal points of the circuit are arranged in alphabetical order.

       The function code is: T.

Example:

       The first circuit to provide a voice frequency telegraph  link  between
       Koebenhavn 1-Montreal 1TE is designated:

       Koebenhavn/1-Montreal/1TE T1.

       A reserve T-circuit is designated according to its present function. The
information  of  being  a  reserve  T-circuit  is  to   be   found   in   the
Related Information under item 7 (ref.  4.8).

3.3.7  Telephone type circuits used to provide TDM (Time Division  Multiplex)
       telegraph systems

       These circuits are designated as follows:

       The terminal points of the circuit are arranged in alphabetical order.

       The function code is: TD.

Example:

       The first circuit used to provide a TDM telegraph system  between  London
       Keybridge and Montreal 1TE:

       London/KB-Montreal/1TE TD1.

       A reserve TD-circuit is designated according to its present function. The
information of being a reserve TD-circuit  is  to  be  found  in  the  Related
Information under item 7 (ref.  4.7).

3.3.8  Telephone type circuits used for data transmission


       These circuits are designated as follows:

       The terminal points of the circuit are arranged in alphabetical order.

       The function code is: D.





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                               - 30 -
                            AP IX-32-E


Example:

       The first circuit used for data transmission between Frankfurt  1  and
       Toronto 1TE is designated:

       Frankfurt/1-Toronto/1TE D1.

3.3.9  Telephone type circuits used as a transfer links for  common  channel
       Signalling Systems No. 6 and No. 7

       These circuits are designated as follows:

       The function code is: DL.

Example:

       The first data link used for common  channel  signalling  between
       Sacramento 4ESS and Tokyo Shinjuku is designated:

       Sacramento/4ES-Tokyo/SJK DL1.

3.4    Related Information

       The additional information on fixed circuits is covered  by  the
following items:

       1)   Urgency for restoration;

       2)   Terminal countries;

       3)   Carriers' names;

       4)   Control and sub-control station(s);

       5)   Fault report points;

       6)   Routing;

       7)   Association;

       8)   Equipment information;

       9)   Use;

       10)  Transmission medium information;

       11)  Composition of transmission;

       12)  Bandwidth or bit rate;

       13)  Signalling information;

       14)  Applicable CCITT Recommendations.





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                               - 31 -
                            AP IX-32-E


       The various items will be dealt with in section 4.
       "Related information for fixed circuits"

4.     Related information for international fixed circuits

4.1    Urgency for restoration

       This item supplies information on the urgency of restoration  of  the
circuit based upon bilateral agreement between the terminal administrations.

Format:

       1.   XXX .... XX; (max. 10 characters)

Illustration:

       a)   If the priority is top   : 1

            If the priority is second: 2

            If the priority is third : 3
       or

       b)   If repair is required within, e.g., 24 hours: < 24 h

       c)   If no urgency has to be indicated: -

Note - In the case of a digital leased circuit the priority or urgency  may  be
decided upon by taking into account the bit rate of the circuit.

4.2    Terminal countries

       This item presents the countries in which the circuit is terminating.

Format:

       2.   XXX, YYY; (three characters for each)

Specification:

       XXX: code for country of town A

       YYY: code for country of town B

Remark:

       The codes are according to the ISO Standard 3166 "Specification for codes
for the representation of names of countries".

       Example for the circuit Paris-Wellington P1:

       2.   FRA, NZL;

4.3    Names of administrations, carriers or broadcasting companies




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                               - 32 -
                            AP IX-32-E


       This item records the names of the carriers which operate the circuit or,
in the case of  sound-programme  and  television  circuits,  the  name  of  the
broadcasting company.























































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                               - 33 -
                            AP IX-32-E


Format:

       3.   YYYYYY, ZZZZZZ; (maximum six characters for each)

Specification:

       YYYYYY: code for company operating in town A

       ZZZZZZ: code for company operating in town B

       Example for the circuit Bern/1RS-New York/1RC TP1 operating  by  Radio
       Suisse and RCA:

       3.   RS, RCA;

4.4    Control station (sub-control station(s))

       This item lists the appointed control station and  sub-control  stations
(according to Recommendations M.80 and M.90 or M.1012  and  M.1013  for  leased
circuits). Further detail about the stations can be found in the List of Contact
Points (Recommendation M.93).

Format:

       4.   CS  :designation of control-station,

            SCS1:designation of sub-control station,

            SCS2: designation of sub-control station,

             .        .             .           .

              .        .             .           .

              .        .             .           .

            SCSn: designation of sub-control station;

Specification:

       CS  :designation of the control station

       SCS1: designation of the terminal sub-control station

       SCS2:if applicable: other sub-control stations

       SCSn:etc., have to be placed in the geographical order according to  the
traffic relation.

Example:

       For the circuit New York/10-Stockholm/1 B1 where New York  is  the
       control station and sub-control stations are in London and Stockholm:

       4.   CS  : Paris-ARC,



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                               - 34 -
                            AP IX-32-E



            SCS1: London/KB;
























































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                               - 35 -
                            AP IX-32-E


4.5    Fault report points

       This item presents the names of both fault report points  on  the
circuit. Further information about the fault report points can be found in
the List of Contact Points (Recommendation M.93).

Format:

       5.   Designation of fault report point, Designation of  fault  report
            point;

Specification:

       The first fault report point is the one belonging to the  country  of
       town A.

       The second fault report point is that of the country of town B.

Example:

       The fault report points for the circuit Athinai-Roma DP3:

       5.   Athinai, Roma/TS1;

4.6    Routing

       This item shows the international primary group(s) or primary block(s) and
the channel number(s) which carry the circuit.  1

       If there are more than one, the groups or blocks appear in the geographical
order from town A to town B.

Format:

       6.    Designation  of  an  international  primary*  group   or   primary
            block/channel number, designation of a primary group or block/channel
            number, ..., designation of a primary group or block/channel number.

Note - Primary groups or blocks can be unidirectional as well. Two  consecutive
unidirectional groups or blocks are separated by a "+" sign instead of a comma.

Example:

       For the circuit from London Mollison to Paris Archives DP7:

       6.   London-Paris 1204/4;
Example:

       For the wideband circuit Frankfurt-London DP5 under item 6  must  be
       registered:

       6.   Amsterdam-Frankfurt 6005/2, Amsterdam-London 6002/3;

─────────
*  In the case where a leased circuit consists of a group or block,  the  primary



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                               - 36 -
                            AP IX-32-E


groups or blocks are to be replaced by the next higher groups or blocks. In
   this case the channel numbers are to be replaced by the group numbers.
























































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                               - 37 -
                            AP IX-32-E


4.7    Association

       This item informs whether there are associated circuits and if so of  what
nature.

Format:

       7.   Association code: Designation(s) of associated circuit(s);

Specification:

       If the circuit has a reserve circuit the association code is:
       S followed by the function code and the serial  number  of  the  principal
circuit.

       If the circuit is a reserve circuit: the association code is:
       Function code followed by S and the serial number of the reserve circuit.

       If the circuit is one of a stereophonic pair, the other  circuit  will
       appear in this item. Association code is: H followed by  a  two  digit
       serial number indicating the number of the stereophonic pair. This  is
       followed by the function code and the serial number of actual circuit.

       If the circut belongs to a multiterminal leased circuit the association code
       is PM, DPM, etc. (ref. 3.2.12 and 3.2.16) followed by the serial number of
       the circuit.

Example 1:

       7.   ST1: Roma/AS1-Zuerich/SEL Z13;

       Read:

       The reserve circuit for the principal circuit T1 is
       Roma/AS1-Zuerich/SEL Z13

Example 2:

       If the circuit London/KB-Paris/ARC R1 is bearing one channel  of  the
       second stereophonic pair from London to Paris and
       London/KB-Paris/ARC R5 the other channel of this pair:

       7.   H02R1: London/KB-Paris/ARC R5;

       Read:

       Circuit R1 being one of the stereophonic pair number two has  as  the
       other circuit of this pair: London/KB-Paris/ARC R5.










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                               - 38 -
                            AP IX-32-E


Example 3:

       If the circuit Bruxelles-Edinburgh PM1 is a part of  an  international
       multiterminal telephone circuit connecting Bruxelles and Paris (being the
       seventh PM-circuit on that relation) with branches from  Bruxelles  to
       Edinburgh and to Aachen (being the second PM-circuit on that relation)
       and with an extension from Paris to Marseille, then  for  the  circuit
       Bruxelles-Edinburgh PM1 under item 7 must be registered:

       7. PM1: Aachen-Bruxelles PM2, Bruxelles-Paris PM7;

Note - The international branches may appear in any order. National branches may be
added after bilateral agreement.

4.8    Equipment information

       This item records any equipment  in  the  circuit  which  requires  special
maintenance attention.

Format:

       8.   xx, xx, xx, xx, xx;

Specification:

       If the circuit has been routed via analogue circuit multiplication equipment:
AM;

       If the circuit has been routed via digital  circuit  multiplication
       equipment

            -    using reduced bit rate encoding: RB

            -    using speech interpolation: SI

       If the circuit has a compandor: CO

       If the circuit consists of a semi-permanent switched connection: SP.

4.9    Use

       This item supplies information on the usage of the circuit if this usage
is known by the administrations and if this is a help for maintenance on the
circuit.

Format:

       9.   XXX..XX; (maximum seven characters)

Specification:

       XX.....XX allows the record of the usage of the circuit;

       If the circuit has been provided with circuit multiplication equipment at
       renters' premises with connecting channels: CC.



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                               - 39 -
                            AP IX-32-E




























































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                               - 40 -
                            AP IX-32-E


4.10   Transmission medium information

       This item identifies whether a particular transmission  medium  is
required in the routing of the circuit.

Format:

       10.  ST. XX......XX; or 10. NS: XX......XX; or 10. -;
             (XX......XX maximum ten characters)

Specification:

       If the circuit has to be routed via satellite: ST followed  by  the
       designation of the satellite;

       If the circuit must not be routed via satellite: NS followed  by  the
       designation of the terrestrial transmission medium;

       If there is no transmission medium requirement: -

       Example for the circuit London-Paris DP3 that has to be  routed  via
       satellite Telecom 1:

       10.  ST.Tel 1;

4.11   Composition of the transmission

       This item shows type of transmission on the circuit.

Format:

       11.  A;, N; or C;

Specification:
                                                      If the  transmission  is
analogue: A

       If the transmission is digital: N

       If the transmission is mixed analogue/digital: C.

4.12   Bandwidth or bit rate

       This item shows the bandwidth (in the case of an analogue circuit or mixed
circuit or the bit rate (in the case of a digital circuit)).

Format:

       12.  xxxx.x Hz; or kHz; or MHz; bit/s; or kbit/s; or Mbit/s; (leading zero's
            and if the decimal is a zero, this decimal and the decimal point may be
            omitted).







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                               - 41 -
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       Rule for the notation of figures:

       If the figure is up to 999, use Hz, bit/s.

       If the figure between 1 000 and 9 999 999, use kHz, kbit/s.

       If the figure 10 000 000 or more, use MHz, Mbit/s.

Specification:

       If the circuit is analogue: the bandwidth in Hz, kHz, MHz

       If the circuit is digital: the bit rate in bit/s, kbit/s, Mbit/s

       Example for the circuit Bordeaux-Darmstadt NP7 with a bit  rate  of
       64 kbit/s:

       12.  64 kbit/s;

4.13   Signalling type

       This item presents the signalling type that applies to  the  circuit
(reference is made to Recommendations M.1045 and Q.8).

Format:

       13.  xxxxxxx; (maximum seven characters).

       If the signalling is of the type xxxx Hz/xx Hz: xxxx/xx.  Otherwise  the
       characters can be used on bilateral agreement between the  two  terminal
       administrations.

Example:

       For a circuit with in-band signalling 1 000 Hz/20 Hz:

       13.  1000/20;

4.14   Applicable CCITT Recommendations

       This item records the CCITT Recommendation(s), e.g. applied as regards the
parameters of the circuit.

Format:

       14.  Rec. X.xxxx, Rec. Y.yyyy; or 14. Rec. X.xxxx; or 14. -;

Specification:

       Whether 2, 1 or no Recommendation numbers are to be  recorded  is
       dependent on the need.







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                               - 42 -
                            AP IX-32-E


Example:

       14.  Rec. M.1020;

Full example for the layered designation structures of a  leased  analogue
circuit

       The circuit is the first analogue  leased  circuit  used  for  data
transmission between London and Frankfurt,  operated  by  British  Telecom
International and Deutsche Bundespost. The signalling type is 500 Hz/20 Hz.

       The control station and sub-control station of the circuit  are  London
Mollison and Frankfurt 0 respectively.

       The two stations are also the fault report points of the  circuit.  The
circuit is routed on third channel of the first group  between  Frankfurt  and
London.

       As regards the parameters of  the  circuit,  Recommendation  M.1020  is
applied. The maintenance contract between administrations and customer is repair
within 24 hours.
The designation:

       Frankfurt-London DP1.

Related Information:

       1)   < 24 h;

       2)   DEU, GBR;

       3)   DBP, BTI;

       4)   CS: London/SM;

            SCS1: Frankfurt/0;

       5)   Frankfurt/0, London/SM;

       6)   Frankfurt-London 1201/3;

       7)   -;

       8)   -;

       9)   D;

       10)  -;

       11)  A;

       12)  3.4 kHz;

       13)  500/20;




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       14)  Recommendation M.1020;


  In the case where a leased circuit consists of a group or block, the primary
groups or blocks are to be replaced by the next higher groups or blocks.  In this
case the channel numbers are to be replaced by the group numbers.

5.     Designations of international groups,  supergroups  etc.  (bidirectional
   and unidirectional)

5.1    General

       The format of the designation of groups etc. is:

┌───────────────┬─────────────────────────────────────────────────────────────┐
│Format of      │ Town A/Transmission   Town B/Transmission   Function  Serial│
│designation    │        station               station          code    number│
│               │        suffix                suffix                         │
│               │                                                             │
│               │      (optional)            (optional)                       │
│               │                                                             │
├───────────────┼─────────────────────────────────────────────────────────────┤
│signs          │      slash           hyphen    slash      space    no space │
│               │                                                             │
├───────────────┼─────────────────────────────────────────────────────────────┤
│number of      │  < 12   1 < 3           1 < 12  1 < 3      1  1-6       2-3 │
│characters     │                                                             │
└───────────────┴─────────────────────────────────────────────────────────────┘

Traffic relation

       Groups etc. are indicated by the names of the towns where the groups etc.
terminate. For the spelling see 1.1. The town names are arranged in alphabetical
order. For multiple destination unidirectional groups the name  of  town  B  is
replaced by (MU) (ref. 5.3.1).

       If the case that a town name exceeds the maximum length of 12 characters,
the responsible administration should supply a suitable abbreviation that must be
unique.

       Transmission station suffix (maximum 3 characters) is an optional  field
which may be used to further identify the terminal point when there is more than
one carrier operating in the town. The necessity for a suffix and its form should
be decided by the administration operating the circuit in the town concerned.

Function code

       This code consists of the nominal number of channels in the group 1). In
the case of an unidirectional single destination group the number is preceded by
(U) (ref. 5.3.2).

Note 1 - Where group, supergroup, etc., links are directly interfaced by analogue
to digital conversion equipment, the number of channels is followed by the letter

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                               - 44 -
                            AP IX-32-E


"C" (ref. 10).

Serial numbering

       This is on a town-to-town basis with an exception for the case when  the
suffix is used. Then the numbering is on a transmission station to transmission
station basis.

       The numbering of a group, supergroup, etc., is applied between the point
where it is assembled to the point where it is broken down, independently of the
position it occupies in the band of line frequencies.

       If the number is < 10, it is preceded by a zero.

5.2    Bidirectional groups etc.

5.2.1  Group2

       Function code is a number that indicates the nominal number of channels in
the group, as follows:
        8 for  8 channel groups.
       12 for 12 channel groups.
       16 for 16 channel groups.

Example:

       The third 12 channel group between Moskva and New York is designated:

       Moskva-New York 1203.

5.2.2  Supergroups2

       Function code is a number that indicates the nominal number of channels in
the supergroup as follows:

       60 for 60 channel supergroups.
       80 for 80 channel supergroups.

Example:

       The first supergroup between London and Amsterdam is designated:

       Amsterdam-London 6001.

5.2.3  "Mastergroups"2

       Function code is: 300.

Example:

       The first mastergroup between Bruxelles and London is designated:

       Bruxelles-London 30001.

5.2.4  "Supermastergroups"2

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       Function code is: 900

Example:

       The tenth supergroup between Amsterdam and Paris is designated:

       Amsterdam-Paris 90010.

Note 2 - For the definitions see Recommendation M.300.

5.2.5  Use of the groups etc.

       This information will be contained in related information under  item  9
"Use" (ref. 7.9). If groups are used for private purpose see 3.2.13.

5.2.6  Restoration groups and supergroups

       Serial numbering for groups and supergroups set upon restoration or spare
groups and supergroups for restoration purposes are numbered by numbers taken from
the 800-Series in descending order and starting from the highest value (899):

       Restoration groups          8899, 8898, 8897, etc.,
                                 12899, 12898, 12897, etc.,
                              or 16899, 16898, 16897, etc.,
                                 as appropriate.

       Restoration supergroups     60899, 60898, 60897, etc.

Example 1:

       The second 12 channels restoration group between London  and  Sydney  is
designated:

       London-Sydney 12898.

Example 2:

       The first restoration supergroup  between  Amsterdam  and  Bruxelles  is
designated:

       Amsterdam-Bruxelles 60899.

5.3    Unidirectional groups and supergroups

5.3.1  Multiple destination unidirectional groups and supergroups

Format:

       The unidirectional route will be designated by the name of  the  sending
terminal station (in the general format: town A) followed by a hyphen whilst the
letters MU (Multiple destination Unidirectional) in parentheses replace town B.
This will be followed by the function code and serial number of  the  group  or
supergroup.


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Examples:

       The first multiple destination unidirectional supergroup from London to for
example Bogota, Lusaka and Montreal, is designated:

       London-(MU) 6001.

       The next such supergroup from the  same  point  of  origin  to  whatever
destinations would take the next number in the series: for example, the  second
supergroup from London is designated:

       London-(MU) 6002.

       but might go, for example, to Tokyo, Hawaii and Melbourne.

       The first supergroup from Montreal to for example London, Lusaka and Paris
is designed:

       Montreal-(MU) 6001.

Note - Groups and supergroups routed via a multiple-access system may be provided
for exclusive use between two terminal stations only, in which case the  normal
designations given above in this Recommendation will apply.

5.3.2  Single destination unidirectional groups and supergroups

Format:

       The unidirectional route will be designated by the name of  the  sending
terminal station (in the general format: town A) followed by a hyphen and the name
of the receiving terminal station (town B). The function code consists  of  the
letter U (Unidirectional) in parentheses and the nominal number of channels of the
group or supergroup.

Example:

       A unidirectional group transmitting in the direction from Paris to Etam,
which, in the reverse direction of  transmission  is  assigned  to  a  multiple
destination unidirectional (MU) group from Etam to Paris and Rio de Janeiro, would
be designated as:

       Paris-Etam (U) 1201.

       The next group between these locations, Paris and Etam, if bidirectional,
would be designated in the normal manner as:

       Etam-Paris 1202.

Note - Groups and supergroups routed via a multiple-access system may be provided
on a bidirectional basis for exclusive use between two terminal stations only, and
in this case the normal designations given above in this Recommendation will apply.

5.4    Related information

       The additional information on groups etc., is covered by  the  following

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items:

        1)  Urgency for restoration;
        2)  Terminal countries;
        3)  Carriers' names;
        4)  Control and subcontrol station(s);
        5)  Fault report points;
        6)  Routing;
        7)  Association;
        8)  Equipment information;
        9)  Use;
       10)  Transmission medium information;
       11)  (Empty item, use: "-;");
       12)  Bandwidth;
       13)  Occupancy;

       The various items will be dealt with in section 7 "Related informations for
international groups and group and line links".

6.     Designations of international group links, supergroup links
       and line links

6.1    Group and supergroup links

       Group links and supergroup links are designated according to the general
format for groups (ref. 5.1). In practice it may be that terminal equipment is not
connected to a group link or supergroup  link.  Nevertheless,  for  designation
purposes, the link will be numbered as though terminal equipment were connected.

6.1.1  Conventional links not connected to their terminal equipment

       Such links are included in the normal numbering sequence of  groups  and
supergroups and are not given a separate numbering sequence.

       When a group link or supergroup link is used only part time with terminal
translating equipment (to provide a conventional group or supergroup) it will be
designated in the normal way. The part time condition of the group link has to be
indicated under related information under item 9 "Use" (ref. 4.9).

Example:

       The group link between Amsterdam and London set up after  five  existing
groups is designated:

       Amsterdam-London 1206.

6.1.2  Restoration links

       Group links and supergroup links nominated for restoration purposes will
receive a serial number from the 800-Series in ascending order and starting from
801.

       Restoration group links:       12801, 12802, 12803, etc.,

       Restoration supergroup links:  60801, 60802, 60803, etc.

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Example:

       The second restoration group  link  between  Hong  Kong  and  Sydney  is
designated:

       Hong Kong-Sydney 12802.

Note - The first two digits 12 in the designation of a restoration group link do not
necessarily indicate the number of channels in the group which is set up via the link.
For example, a restoration group link London-Montreal 12801 might be used to restore
the group London-Montreal 1605.

6.2    Line links (see definition in Recommendation M.300,  1)

       Format of designations of line links:


 ┌─────────────┬──────────────────────────────────────────────────────────────┐
 │ Format of   │ Town A/Transmission   Town B/Transmission   Function   Serial│
 │ designation │        station               station        Code       Number│
 │             │        suffix                suffix                          │
 │             │                                                              │
 │             │        (Optional)            (Optional)                      │
 │             │                                                              │
 ├─────────────┼──────────────────────────────────────────────────────────────┤
 │ signs       │     slash          hyphen   slash          space    no space │
 │             │                                                              │
 ├─────────────┼──────────────────────────────────────────────────────────────┤
 │ number of   │ < 12 1 < 3            1 < 12 1 < 3             1  3-5     2  │
 │ characters  │                                                              │
 └─────────────┴──────────────────────────────────────────────────────────────┘

Traffic relation

       The two terminals are arranged in alphabetical order. For the  use  of  the
suffix ref. 5.1.

Function code

       This code consists of a number indicating  the  nominal  telephone  channel
transmission capacity followed by the letter A.

Serial number

       This is a two-digit number.

Example 1:

       The first 1840 telephone channels capacity line link between Beaver Harbour
and Widemouth is designated:

       Beaver Harbo-Widemouth 1840A01.

Example 2:

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       The first 432 telephone channels capacity line link between Etam and Pleumeur-
Bodou is designated:

       Etam-Pleumeur-Bod 432A01.

Note - Line links are sometimes characterized by having channel capacities not  in
accordance with normal group, supergroup,  etc.,  alignments.  Examples  of  these
nonstandard capacities may often be found in submarine cable or satellite line links.
These links will be numbered in accordance with the nominal channel capacity of the
link.

6.3    Related information

       The additional information on group links, supergroup links and line links is
covered by the following items:

        1)  Urgency for restoration;
        2)  Terminal countries;
        3)  Carriers' names;
        4)  Control and subcontrol station(s);
        5)  Fault report points;
        6)  Routing;
        7)  Association;
        8)  Equipment information;
        9)  Use;
       10)  Transmission medium information;
       11)  (Empty item, use: "-;");
       12)  Bandwidth;
       13)  Occupancy (this item is not in use for  group  links  and  supergroups
links).

       The various items will be dealt with in section 7. "Related information for
international groups, group links and line links".

7.     Related information for international groups, group links
       and line links

7.1    Urgency for restoration

       This item supplies  information  on  the  urgency  of  restoration  of  the
group/group link based upon bilateral agreement between the terminal administrations.

Format:

       1.   xxx .... xx; (maximum 10 characters)

Illustration:

       a)   if the priority is top   : 1
            if the priority is second: 2
            if the priority is third : 3

or


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       b)   if repair is required within e.g., 24 hours: < 24 h

       c)   if no urgency has to be indicated: F-S

Example:

       If the group Bonn-Paris 1201 needs top priority restoration:

1.1;

7.2    Terminal countries

       This item presents the countries in which the group/group link is terminating.

Format:

       2.   xxx, yyy; or xxx; (3 characters for each)

Specification:

       xxx code for country of town A

       yyy code for country of town B

       In the case of multiple destination  unidirectional  group  (MU)  only  xxx
applies.

Example:

       For the group Beograd-Rome 1201:

       2.   YUG, ITA;

       For the multiple destination group Toronto-(MU) 1202

       2.   CAN;

Remark:

       The codes are according to ISO standard 3166 "Specification for codes for the
representation of names of countries."

7.3    Names of administrations, carriers or broadcasting companies

       This item records the names of the carriers which operate  the  group/group
link.

Format:

       3.   xxxxxx, yyyyyy; or xxxxxx; (maximum 6 characters for each)

Specification:

       xxxxxx: name of company in town A


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       yyyyyy: name of company in town B

       In the case of an unidirectional multiple destination only xxxxx applies.

Example:

       For for the supergroup Amsterdam-London 6002:

       3.   NLDPTT, BTI;

       For the multiple destination group Hong Kong-(MU) 1201:

       3.   HGKTEL;

7.4    Control station (subcontrol station(s))

       This item lists the  appointed  control  station  and  subcontrol  stations
(according to Recommendations M.80 and M.90).

       Further details about the stations can be found in the List of Contact Point
(Recommendation M.93).

Format:

       4.   CS: designation of control station,

            SCS1: designation of subcontrol station,

            SCS2: designation of subcontrol station,

              .                .                .

              .                .                .

              .                .                .

            SCSn: designation of subcontrol station;

       or in the case of a multiple destination unidirectional group:

       4.   CS: designation of control station;

Specification:

            CS: designation of the control station;

            SCS1: designation of the terminal station which has subcontrol station
responsibility;

            SCS2: if applicable: other subcontrol station;

            SCS5 etc., are to be placed in the geographical order according      to
the traffic relation.

       In the case of a multiple destination unidirectional group only CS applies.

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       Example for a group Helsinki-Paris 1201 where the control station is Helsinki
TM1 and the subcontrol station is Paris Archives:

       4.   CS:  Helsinki/TM1,

            SCS1:Paris/ARC;

       Example for the multiple destination unidirectional group
Wien-(MU) 1201:

       4.   CS: Wien/ARS;

7.5    Fault report points

       This item presents the names of both fault report points on the group/group
link (according to Recommendation M.130). Further details about the  fault  report
points can be found in the List of Contact Points (Recommendation M.93).

Format:

       5.   Designation of  fault  report  point,   Designation  of  fault  report
                                         point;

or
       5.   Designation of fault report point;

Specification:

       The first fault report point is the one of the country of town A. The second
is that of the country of town B. In the case of a multiple destination unidirectional
group there is only one fault report point under item 5.

Example:

       For the group Moskva-Paris 1201;

       5.   Moskva/MNA, Paris/ARC;

       For the multiple destination unidirectional group Caracas-(MU) 1201:

       5.   Caracas/TS1;

7.6    Routing

       This item records the next higher group within the multiplex  hierarchy  on
which the group/group link has been routed + position number, or in the case of the
highest multiplex level the transmission media on which the group/group link has been
routed.

Format:

       6.   Designation of an international group/position number or designation of
            transmission medium,


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                               - 53 -
                            AP IX-32-E


                        Designation of an international group/position number or designation of
            transmission medium,

                        ........................................................
            ..................................,

                        Designation of an international group/position number or designation of
            transmission medium;

Note - Two consecutive unidirectional groups are separated by a + sign instead of a
comma.

Specification:

       The designation of an international group refers to the next higher level in
the multiplex hierarchy. If there are more than  one,  the  groups  are  noted  in
geographical order from town A to town B.

       Designation of the transmission medium refers to  the  transmission  medium
leaving the country of town A and to the transmission medium entering the country of
town B respectively. As no CCITT designations of transmission media are provided for
the time being, the terminal countries should provide  designations  or  agree  on
designations.

       If there is only one transmission medium, the designation  of  this  medium
applies.

Example:

       A group Alger-London 1201 has been routed internationally as follows:

       6.   Alger-Paris 6002/2, London-Paris 6040/5;

       A supermaster group Barcelona-Perpignan 90001 has been routed as follows:

       6.   Gerona-Perpignan 1800A08;

       A group Caracas-Paris 1201:

       6.   Caracas-Paris 6001/2+ Caracas-(MU) 6002/3;

7.7    Association

       This item identifies whether there are associated group/group links and if so,
of which nature.

Format:

       7.   Association code: designation(s) of the associated group(s)  or  group
link(s);

Specification:

       If the group has a reserve group the association code is:


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                               - 54 -
                            AP IX-32-E


       S followed by the function code and the serial number of the group.

       If the group is a reserve group the association code is:

       Function code followed by S and the serial number of the reserve group.

       The above applies for group links in the same way.

Examples:

       If the normal group is Bruxelles-Luxembourg 1215 and if the group Bruxelles-
Luxembourg 12899 serves as a restoration group for the group  Bruxelles-Luxembourg
1215:

       7.   S1215: Bruxelles-Luxembourg 12899;

       For the group Bruxelles-Luxembourg 12899 there has to be recorded under item
7:

       12S899: Bruxelles-Luxembourg 1215;

7.8    Equipment information

       This item records information on equipment in the  group/group  link  which
requires special maintenance attention.

Format:

       8.   xx, xx, xx, xx;

Specification:

       If the group is carrying companded circuits: CO
       If a group has been routed via TDMA: TD
       If there is no special equipment: -

Note - If there is a need to record any additional equipment information, the free
codeplaces are available for that purpose. The codes to be used must consist of two
characters, have to be unique and can be chosen  by  bilateral  agreement  between
administrations.

Example:

       If a group Geneva-Mexico 1210 is carrying companded circuits:

       8.   CO;

7.9    Use

       This item identifies for what purpose the group/group link is used (if this is
known by the administration and of use for maintenance).

Format:

       9.   xxxxxx (maximum of 6 characters).

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Specification:

       xxxxxx refers to among others the designatory letters Z, B, D, X, DP, RP, VP
etc., as explained in chapters 1 and 3. If no other information is available the sign:
-

Example:

       If the group London-Melbourne 1212 is dedicated to DP-circuits:

       9.   DP;

7.10   Transmission medium information

       This item identifies whether a satellite is involved in the routing.

Format:

       10.  ST; or -;

Specification:

       If the group/group link has been routed via satellite: ST;

       If the group/group link has not been routed via satellite: -

Example:

       If the group Caracas-Madrid 1203 has been routed via satellite:

       10.  ST;

7.11   End-to-end information (for mixed analogue/digital routes only)

       This item provides information on the destinations of the traffic carried by
the group.

Format:
       11.  x......x, y......y; (maximum 12 characters each) or -;

Specification:

       xx..x and y......y are the names of a town and refer to the extremities of the
routes.

       The extremities are placed according to the order of towns in  the  traffic
relation.

       If the group has a multiple destination one town name is replaced by the code:
M.

       If the group is within analogue environment x..x, y..y is replaced by the sign
"-".


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Example:

       If the group Athinai-Paris 60C11 carriers traffic from Bruxelles to Sofia:

       11.  Sofia, Bruxelles;

7.12   Bandwidth

       This item shows the bandwidth of the group/group link.

Format:

       6.   xxxx kHz or MHz of GHz (no leading zero's required).

       Rule for the notation of the figures

       If the bandwidth figure is between 10 000 and 9 999 999, use kHz. If it  is
between 10 000 000 and 9 999 999 999, use MHz. If it is higher, use GHz.

Example:

       A group Bangkok-New Delhi 1201:

       12.  48 kHz;

7.13   Occupancy (for groups/supergroups etc., and for line links)

       This item lists the occupancy of the group expressed by the next lower group
and/or circuits which have been routed in the group.

Format in the case of a group (lowest level):

       13.  Position number: designation of the circuit, or the sign -,
               "       "          "       "  "     "      "  "    "  ",
               "       "          "       "  "     "      "  "    "  ",
               "       "          "       "  "     "      "  "    "  ",
               "       "          "       "  "     "      "  "    "  ",
               "       "          "       "  "     "      "  "    "  ";

Format in the case of a supergroup or higher level group:

13. Position number: designation of a group, of a leased circuit or the sign -,
      "        "          "       "     "      "     "      "      "     "   ",
      "        "          "       "     "      "     "      "      "     "   ",
      "        "          "       "     "      "     "      "      "     "   ",
      "        "          "       "     "      "     "      "      "     "   ",
      "        "          "       "     "      "     "      "      "     "   ",
      "        "          "       "     "      "     "      "      "     "   ";

Specification:

       If the position number is occupied by a next lower group: designation of this
group. If the position number is occupied by a leased circuit  (with  a  bandwidth
corresponding to the bandwidth of the next lower multiplex level e.g., ref. 3.2.13);
designation of this leased circuit. If the position number is not in use: -

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Example:

       For a supergroup Athinai-Paris 6002:

       13.  01: Beyrouth-Paris 1209,
            02: London-Sofia 1202,
            03: Athinai-Paris 1205,
            04: Athinai-Rotterdam 1202,
            05: Athinai-Paris DP4;

A.     Full example for the designation information of an international group

Note - The numbers between parentheses refer to the numbers of the  items  in  the
related information.

       It is the fifth group between Amsterdam and Paris. The urgency for restoration
(1) is third priority, the terminal countries (2) are The Netherlands and France, the
administrations involved (3) are The Netherlands PTT and France Telecom, the control
station and subcontrol station (4) are Paris Archives and Amsterdam 1 respectively,
the fault report points (5) are Amsterdam 2 and Paris Archives, routing (6) of the
group is in the supergroup Amsterdam- Bruxelles 6011 on  position  1  and  in  the
supergroup Bruxelles-Paris 6002 on position 3, there is an  associated  group  (7)
carrying traffic but indicated for restoration namely Amsterdam-Paris 1209, there is
special equipment involved (8)  because the group is carrying companded circuits the
use (9) is: Z-circuits and a DP circuit, no satellite (10) is involved, no end-to-end
information (11) is to be recorded, the bandwidth (12) is 48 kHz and the occupancy
(13) is to be seen from the example.

The designations:

       Amsterdam-Paris 1205

Related information

       1)   3;
       2)   NLD, FRA;
       3)   NLDPTT, FRATEL;
       4)   CS: Paris/ARC, SCS1: Amsterdam/1;
       5)   Amsterdam/2, Paris/ARC;
       6)   Amsterdam-Bruxelles 6011/1,
            Bruxelles-Paris 6002/3;
       7)   S1205: Amsterdam-Paris 1209;
       8)   CO;
       9)   Z, DP;
       10)  -;
       11)  -;
       12)  48 kHz;
       13)  01: Amsterdam-Paris Z111,
            02: Amsterdam-Paris Z113,
            03: Amsterdam Paris Z115,
            04: Amsterdam-Paris Z117,
            05: Amsterdam-Paris Z119,
            06: Amsterdam-Paris Z121,
            07: Paris-Amsterdam Z120,

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            08: Paris-Amsterdam Z122,
            09: Paris-Amsterdam Z124,
            10: Paris-Amsterdam Z126,
            11: Paris-Amsterdam Z128,
            12: Amsterdam-Paris DP5.

B.     Full example for the designation information of an international
       group link

Note - The numbers between parentheses refer to the numbers of the  items  in  the
related information.

       It is the first restoration group link between Paris and Geneva. The urgency
for restoration (1) is third priority, the terminal countries (2) are Switzerland and
France, the administrations (3) are Swiss PTT and France Telecom, the control  and
subcontrol station (4) are Geneva Monthoux and Paris Archives respectively, the fault
report points (5) are the same stations, the routing (6) is in the second supergroup
between Geneva and Annemasse on position 1, there is no information to be recorded
about association (7), special equipment (8), the use (9), there is  no  satellite
involved (10), no end-to-end information (11) is required, the bandwidth (12) is 48
kHz.

The designations:

       Geneva-Paris 12801.

Related information

       1)   3;
       2)   CHE, FRA;
       3)   CHEPTT, FRATEL;
       4)   CS: Geneva/MON, SCS: Paris/ARC;
       5)   Geneva/MON, Paris/ARC;
       6)   Annemasse-Geneva 6002/1;
       7)   -;
       8)   -;
       9)   -;
       10)  -;
       11)  -;
       12)  48 kHz;

8.      Designations  of   international   digital   blocks   (bidirectional   and
unidirectional)

8.1    General

       This section refers to blocks which  are  part  of  the  digital  multiplex
hierarchy and which are formatted according to Recommendations G.734, G.736, G.742,
G.743, G.745, G.751, G.752, G.753 and G.754. All other blocks are designated according
to section 11.

       Format of designation of digital blocks:


   ┌────────────┬──────────────────────────────────────────────────────────────┐

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   │ Format of  │Town A/Suffix for    Town B/Suffix for      Function   Serial │
   │ designation│       Transmission         Transmission    Code       Number │
   │            │       station or           station or                        │
   │            │       International        International                     │
   │            │       exchange             exchange                          │
   │            │       (Optional)           (Optional)                        │
   ├────────────┼──────────────────────────────────────────────────────────────┤
   │            │                                                              │
   │ signs      │   slash           hyphen    slash        space    no space   │
   ├────────────┼──────────────────────────────────────────────────────────────┤
   │            │                                                              │
   │ number of  │ < 12   1 < 3          1 < 12 1 < 3           1  3-5     < 4  │
   │ characters │                                                              │
   └────────────┴──────────────────────────────────────────────────────────────┘

Traffic relation

       Town A and town B possibly  with  a  suffix  for  transmission  station  or
international exchange indicate the terminal points of the block. For the spelling see
1.1. If a town name exceeds the maximum length of 12 characters, the administrations
should supply a suitable abbreviation which must be unique.  The  town  names  are
arranged in alphabetical order.

       The suffix for transmission station or international  exchange  (maximum  3
characters) is an optional field which may be used to further identify the terminal
point when there is more than one carrier operating in the town. The necessity for a
suffix and its form should be decided by the administration operating the circuit in
the town concerned.

       In the case of a multiple destination unidirectional block, town B is replaced
by (MU) (ref. 8.3).

Function code

       This code consists of a number indicating the nominal number of channels in
the block followed by the letter N.

       For blocks  in  a  mixed  analogue/digital  environment  see  10.1.2.  Then
< 6 characters are required.

Serial number

       This is a 1-4 digit number counting the number of blocks with the same traffic
relation and the same function code.

8.2    Bidirectional digital blocks

       These blocks are designated according to the principles stated above  (ref.
8.1).

Example 1:

       The fourth secondary order block between London and Paris is designated:

       London-Paris 120N4.

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Example 2:

       The tenth primary order block between New York and Tokyo is designated:

       New York-Tokyo 24N10.

8.3    Restoration digital blocks

       Digital blocks set up on restoration digital paths or spare digital paths for
restoration purposes are indicated by serial numbers taken from the 800-Series. The
serial numbering starts at 899 and blocks are numbered in descending order.

Example:

       The first fourth order restoration block between Koebenhavn and Stockholm is
designated:

       Koebenhavn-Stockholm 1920N899.

8.4    Multiple destination unidirectional digital blocks

       For these blocks the traffic relation is composed of the name of the sending
terminal station followed by a hyphen and the  letters  MU  (Multiple  destination
Unidirectional) in parentheses.

Examples:

       The first multiple destination unidirectional primary  digital  block  from
Bercenay (to, for example, London and Bruxelles) is designated:

       Bercenay-(MU) 30N1.

       The next multiple destination unidirectional  primary  digital  block  from
Bercenay (to, for example, Frankfurt and Rome) is designated:

       Bercenay-(MU) 30N2.

Note - Digital blocks routed via a multi-access system may be provided for exclusive
use between two terminal stations only in which case the normal designations given
above in this Recommendation will apply.

8.5    Single destination unidirectional digital blocks

       These are designated as normal digital blocks  and  numbered  in  the  same
sequence. The unidirectional property as well as the direction of transmission has to
be registered under related information under item 16 "Direction of  transmission"
(ref. 12.16).

Example:

       An unidirectional primary digital block transmitting in the direction Roma to
London being the twenth-first primary digital blocks on that relation is designated:

       London-Roma 30N21.

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8.6    Related Information

       The additional information on digital blocks is covered  by  the  following
items:

       1)   Urgency for restoration;
       2)   Terminal countries;
       3)   Carriers' names;
       4)   Control and subcontrol station(s);
       5)   Fault report points;
       6)   Routing;
       7)   Association;
       8)   Equipment information;
       9)   Use;
       10)  Transmission medium information;
       11)  (Empty item, use -);
       12)  Bit rate;
       13)  Occupancy;
       14)  Actual number of channels (for primary blocks only);
       15)  Clocking information;
       16)  Direction of transmission (for unidirectional blocks only).

       The various items will be dealt with in section 12 "Related information for
international digital blocks, paths and data transmission systems".

9.     Designations of international digital paths

       In practice it may be that terminal equipment is not connected to a digital
path. Nevertheless, for designation purposes the digital path will be designated as
though digital blocks had been set up (ref. 8.1).

9.1    Conventional digital paths not connected to their terminal equipment

       Such digital paths are included in the normal serial numbering sequence  of
digital blocks and are not given a separate numbering sequence.

9.2    Restoration digital paths

       Digital paths nominated for restoration purposes are designated  by  serial
numbers taken from the 800-Series. The serial numbering starts at 801 and paths are
numbered in ascending order.

       Restoration paths for first order digital blocks: 30N801, 30N802 etc.

       Restoration paths for second order digital blocks: 120N801, 120N802, etc.

Example 1:

       The fourth second order restoration digital path between London and Paris is
designated:

       London-Paris 120N804.

Example 2:

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       The first third order restoration digital path between Amsterdam and Paris is
designated:

       Amsterdam-Paris 480N801.

9.3    Digital transmission systems

       Designations of digital line sections and digital radio sections are  under
consideration.

9.4    Related information

       The additional information on digital paths is covered by the following items:

       1)   Urgency for restoration;
       2)   Terminal countries;
       3)   Carriers' names;
       4)   Control and subcontrol station(s);
       5)   Fault report points;
       6)   Routing;
       7)   Association;
       8)   Equipment information;
       9)   Use;
       10)  Transmission medium information;
       11)  (Empty item, use -);
       12)  Bit rate;

       The various items will be dealt with in section 12 "Related information for
international digital blocks, paths and data transmission systems".

10.    Designations of routes in the mixed analogue/digital transmission network

       To be in accordance with the philosophy for lining-up and maintaining a mixed
analogue/digital transmission network (Recommendation M.20), the analogue and digital
parts of the network are designated separately. To indicate  that  the  end-to-end
transmission relies on a mixture of analogue and digital transmission systems, the
letter C is included in both the analogue and digital designations.

       Transmultiplexer equipment is included in the designation of the analogue part
of the route.

10.1   Transmission routes 5) with one analogue-to-digital conversion

10.1.1 Groups and supergroups etc., forming part of a mixed
       analogue/digital transmission route

       Groups, supergroups, etc., which are converted into digital paths  at  some
point are designated in the same way as conventional groups or supergroups (ref. 5.1)
but have a letter C included in the function code and placed after the nominal number
of channels.

Examples:

       Group           : London-Riyadh 12C02

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                       Amsterdam-Koebenhavn 12C899
                       (restoration group)
       Supergroup      : Paris-Sydney 60C01
       Mastergroup     : Brussels-London 300C03
       Supermastergroup: Amsterdam-Paris 900C04

       Figure 1/M.140 shows a typical analogue/digital arrangement and how it will be
designated.

10.1.2 Digital blocks and paths forming part of a mixed
       analogue/digital transmission route

       Digital  blocks  and  paths  which  are  converted  into  analogue  groups,
supergroups, etc., at some point are designated in the same  way  as  conventional
digital blocks and paths but have an additional letter C placed after the letter N.

Example:

       Madrid-Roma 480NC1.

       Figure 1/M.140 shows a typical analogue/digital arrangement and how it will be
designated.

10.1.3 End-to-end designations

       This subject is covered by item 11 in layer 2 for digital blocks (ref. 12.11).

Note 5 - This term is used provisionally in  this  context  to  designate  various
combination of analogue and digital sections with appropriate intermediate equipment
and usually also including terminal equipment, as illustrated in Figure 1/M.140 and
Figure 2/M.140.

10.2   Transmission routes with two analogue-to-digital conversions

10.2.1 End-to-end designations

       Where both ends of a route involving two analogue-to-digital conversions are
analogue an end-to-end designation, using the analogue notation described in  10.1.1,
should be agreed between the terminal administration.

       Where both ends are digital, and end-to-end designation using  the  digital
notation described in  10.1.2, should be agreed between the terminal administrations.

       By the above means both terminal stations have available a common designation
for the end-to-end transmission route, and are informed of its mixed analogue/digital
nature.

10.2.2 Intemediate section designation

       The intermediate part of the route is given a separate designation using the
appropriate notation. The choice of this designation is the responsibility of  the
administrations providing the intermediate part of the  route,  and  it  is  their
responsibility to associate, in their records, this intermediate designation with the
overall designation.


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       Figure 2/M.140 shows two examples of routes involving two analogue-to- digital
conversions and how they will be designated.

10.3   Transmission routes with more than two analogue-to-digital conversions

       The transmission planning rules given  in  Recommendation  G.113    3  |2|
effectively restrict the number of unintegrated digital processes (e.g., analogue-to-
digital conversions) permitted in the international part of a telephone connection.
       Similarly, the routing plan given in Recommendation E.171 |3| restricts the
number of international circuits in a connection to four. In view of these rules it is
desirable to limit the number of analogue-to-digital conversions in each direction
between international centres to a maximum of two. Therefore the detailed designation
requirements of routes with more than two analogue-to- digital conversions are not
considered.

10.4   Related information

       The additional information on groups and blocks in the mixed analogue/digital
network is covered by the  same  items  as  analogue  groups  and  digital  blocks
respectively. However the item 11 "End-to-end information" is used in addition (ref.
7.11 and 12.11).

11.    Designation of data transmission systems (note 1)

11.1   General

       This section deals with data transmission systems provided  between  the
premises of administrations. (Those between renters'  premises  are  designated
according to section 3.2.15 digital leased circuits.)

       The designation scheme of these data transmission systems can only be used
if  they   are   non-hierarchical   or   not   formatted   according   to   the
Recommendations G.734, 736, 742, 743, 745, 751, 752, 753 and 754. This means that
digital blocks from a digital multiplex hierarchy, with  a  format  defined  in
Recommendation G.702 cannot have a designation taken from this section. They should
be designated according to section 8.

Note 1 - This section deals  with  digital  transmission  only.  Analogue  data
transmission systems and links are covered by circuits, groups and group links.

       Format of designations of data transmission systems:


┌─────────────┬───────────────────────────────────────────────────────────────┐
│  Format of  │ Town A/Suffix for     Town B/Suffix for    Function   Serial  │
│ designation │        transmission          transmission    code     number  │
│             │        station or            station or                       │
│             │        international         international                    │
│             │        exchange              exchange                         │
│             │        (Optional)            (Optional)                       │
├─────────────┼───────────────────────────────────────────────────────────────┤
│  Signs      │      Slash        Hyphen       Slash       Space     No Space │
├─────────────┼───────────────────────────────────────────────────────────────┤
│  Number     │ ≤ 12    1 ≤ 3        1 ≤ 12     1 < 3       1 ≤ 5       1-3   │
│characters   │                                                               │
└─────────────┴───────────────────────────────────────────────────────────────┘



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Traffic relation:

       Town A and Town B possibly with a transmission station or  international
exchange suffix represent the two terminal stations of  the  data  transmission
system.

       The names are arranged in alphabetical order. For the spelling see 1.1.  If
the town name exceeds the maximum  length  of  12  characters  the  responsible
administration should supply a suitable abbreviation which must be unique.

       Transmission  station  or   international   exchange   suffix   (maximum
3 characters) is an optional field which may be used to  further  identify  the
terminal point when there is more than one carrier operating in the  town.  The
necessity for a suffix and its form should be  decided  by  the  administration
operating the circuit in the town concerned.

Function code:

       This code consists of a two to four - digit number which together with a
letter which shows the multiplication factor, indicates the bit rate in bit/s.

       The letters to be used to indicate the multiplication factor are:

       Bit rate of system                  letter

       Up to 999 bit/s                          B
        1 000 to 9 999 bit/s                    H
       10 000 to 9 999 999 bit/s                K
       10 000 000 to 9 999 999 999 bit/s        M

Serial number:

       This is a one  to  three  digit  number  counting  the  number  of  data
transmission systems with the same traffic relation and the same function code.

Note - The use of the data transmission system (e.g. multiplex of  digital  leased
circuits, broadcasting, video) will be recorded in (Related Information under item 9
(ref 12.9).

Example:

       The first 9600 bit/s data transmission system between Lisboa and New York (for
example in use for a multiplex of 2400 bit/s and 7200 bit/s circuits):

       Lisboa - New York 96H1.

       The eleventh 2048 kbit/s data transmission system between London and  Paris
(used, for example, for public video conference):

       London - Paris 2048K11.

11.2   Data transmission links

       Data transmission links are designated as data transmission systems.


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11.3   Related information

       The additional information on data transmission systems is covered  by  the
following items:

       1.   Urgency for restoration;
       2.   Terminal countries;
       3.   Carriers' names;
       4.   Control and subcontrol station(s);
       5.   Fault report points;
       6.   Routing;
       7.   Association;
       8.   Equipment information;
       9.   Use;
       10.  Transmission medium information;
       11.  Composition of transmission;
       12.  (Empty item, use: - );
       13.  Occupancy.

       Various items will be dealt with in Chapter  12  "Related  information  for
international digital blocks, paths and data transmission systems".

12.    Related information  for  international  digital  blocks,  paths  and  data
       transmission systems

12.1   Urgency for restoration

       This item supplies information on the urgency of restoration of the  block,
path etc., based upon bilateral agreement between the terminal administration.

Format:

       1.   xx ... xx; (maximum 10 characters)

Illustration:

       a)   If the priority is top:      1
            If the priority is second:   2
            If the priority is third:    3
       b)   If repair is required within e.g. 24 hours: ≤ 24h
       c)   If no urgency has to be indicated: -

Example:

       If a block needs top priority in the case of restoration: 1.1

12.2   Terminal countries

       This item presents the countries in which the block, path or data transmission
system is terminating.

Format:

       2.   xxx, yyy; (3 characters for each) or 2. xxx;


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Specification:

       xxx: code for country of town A
       yyy: code for country of town B

       In the case of multiple destination unidirectional block only xxx applies.

Remark:

       The codes are according to ISO Standard 3166 "Specification for codes for the
representation of names of countries".

Example:

       For a digital block Bruxelles-Frankfurt 120N1:

       2.   BEL, DEU;

12.3   Names for administration, carriers or broadcasting companies

       This item records the names of the carriers which operate the  block,  path
etc.;

Format:

       3.   xxxxxx, yyyyyy; (maximum 6 characters for each) or 3. xxxxxx;

Specification:

       xxxxxx: name of company in town A
       yyyyyy: name of company in town B

       In the case of multiplex destination undirectional block only xxxxxx applies.

Example:

       For a digital block  Frankfurt-London  30N1  operated  by  British  Telecom
International and Deutsche Bundespost:

       3.   DBP, BTI;

12.4   Control station (subcontrol station(s))

       This item lists the  appointed  control  station  and  subcontrol  stations
(according to Recommendations M 80 and M 90). Further details about the stations can
be found in the List of Contact Points (Recommendation M.93).

Format:

       4.   CS:  designation of control station;
            SCS1:designation of subcontrol station;
            SCS2:designation of subcontrol station;
              .                 .                 .
                .                 .                 .


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                .                 .                 .
            SCSn:designation of subcontrol station;

or in the case of a multiple destination unidirectional block:

       4.   CS:  designation of control station;

Specification:

            CS:   designation of the control station;
            SCS1: designation of the terminal station which has subcontrol
                     station responsibility;
            SCS2: if applicable: next subcontrol station.

       SCSn etc., are to be placed in the geographical order according to the traffic
relation. In the case of a multiple destination unidirectional block only CS applies.

Example 1:

       For the digital block Stockholm-Venezia 30N1 with control station Stockholm
and subcontrol stations Venezia and Paris:

       4.   CS:      Stockholm/HAM;
            SCS1:    Venezia/CEN;
            SCS2:    Paris/ARC.

Example 2:

       For the digital block Rio De Janeiro-(MU) 30N1:

       4.   CS:   Rio de Janei/1;

12.5   Fault report points

       This item presents the names of both fault report points on the block, path
etc., (according to Recommendation M.130). Further details about the fault  report
points can be found in the List of Contact Points (Recommendation M.93).

Format:

       5.   Designation of fault report point, designation of fault report point;

or

       5.   Designation of fault report point;

Specification:

       The first fault report point is the one of country of town A. The second fault
report point is the one of country of town B. In the case of a multiple destination
undirectional block the second station and the comma are omitted.

Example 1:

       For the digital block Lisboa-Zuerich 30N1:


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       5.   Lisboa/MAR, Zuerich/SEL.

Example 2:

       For the digital block Jakarta-(MU) 30N1:

       5.   Jakarta/1.

12.6   Routing

       This item records the next higher block within the multiplex  hierarchy  on
which the block path, data transmission system, has been routed + position number, or
in the case of the highest multiplex level the transmission media on which the block
has been routed.

Format:

       6.   Designation of an international block/position number or designation of
            transmission medium,
                        designation of an international block/position number or designation of
            transmission medium,
                        ...........................; or ...............................
            ...........................,
                        designation of an international block/position number or
            designation of transmission medium;

Note - two consecutive unidirectional blocks are separated by a + sign instead of a
comma.

Specification:

       The designation of an international block refers to the next higher level in
the digital multiplex hierarchy. If there are more than one, the blocks are noted in
geographical order from town A to town B. Designation of the transmission medium
refers to the transmission medium leaving the country  of  town  A  and  to  the
transmission medium entering the country of town B  respectively.  As  no  CCITT
designation of transmission media nor digital line or radio sections are provided
for the time being, the terminal countries should provide or agree on designations.

       If there is only one transmission medium: the designation of this  medium
applies.

Example 1:

       For the primary digital block Frankfurt-Zuerich 30N7:

       6.   Frankfurt-Zuerich 120N1/3.

Example 2:

       For the block Bruxelles-London 1920N1:

       6.   UK-B 5.



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12.7   Association

       This item identifies whether there are  associated  blocks,  paths,  data
transmission systems and if so, of which nature.

Format:

       7.   Association code: designation of the associated block, paths
                             etc., or blocks paths etc.

Specification:

       If the block has a reserve block the association code is: S followed by the
function code and the serial number of the principal block.

       If the block is a reserve block: the association code  is:  Funtion  code
followed by S and the serial number of the reserve block.

       The same applies for digital paths and data transmission systems.

Example:

       If the path Hongkong-Singapore 30N801 is the restoration path for the normal
block Hongkong-Singapore 30N3, the related information for the normal block under
association must show:

       7.   S30N3: Hongkong-Singapore 30N801.

12.8   Equipment information

       a)   This item records information on equipment in the block, path  etc.,
which requires special maintenance attention.

Format:

       8.   xx, xx, xx, xx

Specification:

       If the block has been routed via TDMA: TD.

       If there is a need to record any additional equipment information, the next
free codeplaces are available for that purpose. The codes to be used must consist of
two characters, have to be unique and can be chosen by bilateral agreement between
administrations.

       b)   For data transmission systems this item supplies information about the
multiplex configuration.

Format for data transmission systems only:

       8.   xyyyyzzzzz

Specification:



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       x    refers to the Recommendation series
       yyyy refers to the Recommendation number
       z...zrefers to the section, paragraph, table etc., number.

Example:

       For a 9600 bit/s data transmission system with a multiplex configuration as
defined in Recommendation M.1320 Table A-1 item 8 will present:

       8.   M1320TA-1.

12.9   Use

       This item identifies for what purpose the block, path, data  transmission
system is used (if this is known by the administration and of use for maintenance).

Format:

       9.   xxxxxx; (maximum 6 characters)

Specification:

       xxxxxx refers to among others the designatory letters Z, B, D, V etc., to
indicate the use of the block. If no information is available: -

Example:

       If the digital block Frankfurt-Luxembourg 30N1 is used for sound-programme
transmission:

       9.   R;

12.10  Transmission medium information

       This item identifies whether a satellite is involved in the routing.

Format:

       10.  ST; or -;

Specification:

       If the block has been routed via satellite: ST
       If the block has not been routed via satellite: -

Example:

       For the block Paris-(MU) 30N1:

       10.  ST;

12.11.AEnd-to-end-information (for blocks and paths on mixed analogue/digital
                                 routes only)

       This item provides information on the destinations of the traffic carried by the


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block or path.

Format:

       11.  x....x, y........y; (maximum 12 characters each) or -;

Specification:

       x....x and y....y refer to the names of the towns which form the extremities of
this route. The town names are placed according to the order in the traffic relation.

       If the block has multiple destination the town name  is  replaced
       by "M".
       If the block is within a digital environment x..x, y..y is replaced by the
       sign "-".

Example 1:

       A primary digital block Frankfurt-Paris 30NC6 being part of  a  mixed
route Frankfurt-London will have under item 11:

       11.  Frankfurt, London;

Example 2:

       A primary block Amsterdam-Bruxelles 30NC146 being part of a  mixed  route
London-Luxembourg will show under this item:

       11.  London, Luxembourg;

12.11.BComposition of transmission (for data transmission systems)

       This item shows the type of transmission on the data transmission system.

Format:

       11.  A, N or C;

Specification:

       If the transmission is analogue        : A
       If the transmission is digital         : N
       If the transmission analogue/digital   : C

12.12  Bit rate (for blocks and paths)

       This item shows the bit rate of the block or path.

Format:

       12.  xxxx.x kbit/s or Mbit/s;

       Leading zeros and if the decimal is a zero, this decimal and the  decimal
sign may be omitted.



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       If the bit rate is up to 9 999 999 bit/s use kbit/s
       If it is higher use Mbit/s

Note - for data transmission systems use the sign: -

Example 1:

       The digital block New York-Tokyo 24N2 will have under this item:

       12.  1544 kbit/s

Example 2:

       The digital block Bruxelles-Luxembourg 480N1 will have under this item:

       12.  34 Mbit/s;

12.13  Occupancy (for blocks and data transmission systems

       This item lists the occupancy of the block expressed by  the  next  lower
blocks and/or circuits and/or data transmission systems which have been routed in
the block.

Format in the case of a primary block:

       (The same format applies to data transmission systems, replacing "time slot
number" by "channel number" according to Recommendation M.1320.)

       13.  Time slot number: designation of the circuit, or the sign -,
                     "                        "            ,        "    -,
                     "                        "            ,        "    -,
                     "                        "            ,        "    -,
                     "                        "            ,        "    -,
                     "                        "            ,        "    -,
            Time slot number: designation of the circuit, or the sign -;

Format in the case of a secondary or higher level block:

      13.  Position number: designation of a block, of a leased circuit or of a
                            data transmission system or the sign - ,
                "                                "                 ,
                "                                "                 ,
                "                                "                 ,
         Position number: designation of a block, of a leased circuit or of a
                            data transmission system or the sign - ;

Specification:

       If the position number is occupied by a next  lower  digital  block:
       designation of this block.
       If the position number is occupied by a digital leased circuit (with a bit
       rate corresponding to the bit rate of the next lower  multiplex  level):
       designation of this leased circuit.
       If the position number is occupied by a data transmission system (with a
       bit rate corresponding to the bit rate of the next lower multiplex level):


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                            AP IX-32-E


       designation of this data transmission system.
       If the position number is not in use the sign: - .

Example 1:

       Item 13 digital of block Geneve-Paris 120N2 is

       13.01.    Geneve-Lisboa 30N1,
       13.02.    -,
       13.03.    Geneve-Paris 2048K1,
       13.04.    Bruxelles-Wien 30N1;

Example 2:

       Item 13 of digital block New York-Paris 24N5:

       13.01:    New York/24-Paris/PT2 Z1,
          02:    New York/24-Paris/PT2 Z3,
          03:    New York/24-Paris/PT2 Z5,
          04:    Paris/PT2-New York/24 Z2,
          05:    Paris/PT2-New York/24 Z4,
          06:    Paris/PT2-New York/24 Z6,
          07:    -,
          08:    -,
          09:    -,
          10:    Orlando/TS1-Toulouse/FER 64K1,
          11:    -,
          12:    -,
          13:    -,
          14:    -,
          15:    New York/TS1-Paris/ARC R1,
          16:    New York/TS1-Paris/ARC R3,
          17:    -,
          18:    -,
          19:    -,
          20:    Paris/BEA-Washington/TS1 NP1,
          21:    -,
          22:    -,
          23:    -,
          24:    -,

12.14  Actual number of channels (primary blocks only)

       This item contains the actual number of channels on a  primary  digital
block.

Format:

       14.  xxx;

Specification:

       xxx indicates the actual number of channels.

       For highest blocks xxx is replaced by the sign - .


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Example 1:

       The digital block New York-Paris 30N5 dedicated to leased circuits will
show under this item:

       14.  31;

Example 2:

       The digital block London-New York 30N3 used for switched public telephone
circuits with ADPCM may have under this item:

       14.  60;

Example 3:

       This digital block Honolulu-Osaka 24N2 used for switched public telephone
circuits:

       14.  24;

12.15  Clocking information (for blocks only)

       This item specifies whether  administration  apply  a  clocking  system
according to CCITT Recommendation G.811 or use a master/slave system.

Format:

       15.  xx .... xx; (maximum 30 characters)

Specification:

       If clocking according to Recommendation G.811 is applied: G.811;
       If a master/slave clocking is applied:

       M = xxx .... xx,              S = xx .... xx;
       (Town name for the master)    (Town name for the slave)

Example 1:

       Clocking according to Recommendation G.811:

       15.  GT.811;

Example 2:

       Clocking according to master/slave system:

       15.  M = London, S = Frankfurt;

12.16  Direction of transmission (for undirectional blocks)

       This item gives information on  the  direction  of  transmission  of  a
unidirectional digital block.


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Format:

       16.  I; or A;

Specification:

       If the block is unidirectional and if it has a single destination:

       . if the direction of transmission is in the alphabetical order: A
       . if the direction of transmission is in the inverse alphabetical
           order: I

Example:

       Unidirectional digital block transmitting in the direction Roma to London,
London-Roma 30N1 will have under item 16:

       16.  I;

A.     Full example for the designation information of an international digital
       block

Note - The number between parentheses refer to the numbers of the items in the
related information.

       It is the 12th primary digital block between Roma and Paris. The urgency
for restoration (1) is 2, the terminal countries (2) are France and Italy, the
administrations involved (3) are France Telecom and ASST, control station (4) is
Roma 1 and subcontrol station is Paris Archives, the fault report points (5) are
the same stations, the block has been routed (6) in the secondary digital block
Paris-Roma 120N2 on position number 3, it has an associated block (7) indicated
for restoration Paris-Roma 30N5, no special equipment (8) is involved, the use of
the block (9) is DP- and NP-circuits, no satellite is involved (10), no end-to-end
information (11) is required, the bit rate (12) is 2.048 Mbit/s, the occupancy
(13) is to be seen in the example, the actual number of channels (14) is 31, the
clocking system (15) is a master/slave system with the master in Paris and the
slave in Roma.

The designation:

       Paris-Roma 30N12

Related information:

       1.   2;
       2.   FRA, ITA;
       3.   FRATEL, ASST;
       4.   CS: Roma/1,
               SCS1: Paris/ARC;
       5.   Paris/ARC, Roma/1;
       6.   Paris-Roma 120N2/3;
       7.   S30N12: Paris-Roma 30N5;
       8.   -;
       9.   DP, NP;


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       10.  -;
       11.  -;
       12.  2048 kbit/s;
       13.  01: London-Roma DP12,
            02: Paris-Roma DP2,
            03: Napoli-Rouen NP1,
            04: Paris-Roma NP3,
            05: Paris-Roma NP4,
            06: Paris-Roma NP5,
            07: -,
            08: -,
            09: -,
            10: Lille-Roma DP1,
            11: Paris-Roma DP5,
            12: -,
            13: -,
            14: -,
            15: -,
            16: Bruxelles-Roma DPM4,
            17: Paris-Roma NPM1,
            18: -,
            19: -,
            20: -,
            21: -,
            22: -,
            23: -,
            24: -,
            25: -,
            26: -,
            27: -,
            28: -,
            29: -,
            30: -,
            31: -,
       14.  31: -,
       15.  M = Paris, S = Roma

B.     Full example for the designation information of an international digital
       path

Note - The numbers between parentheses refer to the numbers of the items  in  the
related information.

       It is the first restoration digital second order path  between  Paris  and
Bruxelles. The urgency for restoration (1) is 3, the terminal countries  (2)  are
Belgium and France, the administrations involved (3)  are  the  Belgium  RTT  and
France Telecom, control station (4) is Bruxelles BLA and subcontrol station is Paris
Archives, the fault report points (5) are the same stations, the path has been routed
(6) in the first third order block Bruxelles-Paris on position number 1, there are no
associated blocks (7), no special equipment (8), use (9) has not been indicated, no
satellite is involved (10), no end-to-end information (11) is required, the bit rate
(12) is 8.448 Mbit/s.

The designation:



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       Bruxelles-Paris 120N801

Related information

       1.   3;
       2.   BEL, FRA;
       3.   BELRTT, FRATEL;
       4.   CS: Bruxelles/BLA,
            SCS1: Paris/ARC;
       5.   Bruxelles/BLA, Paris/ARC;
       6.   Bruxelles-Paris 480N1/1;
       7.   -;
       8.   -;
       9.   -;
       10.  -;
       11.  -;
       12.  8448 kbit/s

C.     Full example for the designation  information  of  an  international  data
       transmission system

Note - The numbers between parentheses refer to the numbers of the items  in  the
related information.

       It is the first 64 kbit/s data transmission system between London and Paris.
The urgency for restoration (1) is 1, the terminal countries (2) are United Kindom
and France, the administrations involved (3) are British Telecom International and
France Telecom, the control and subcontrol station (4) are London Mollison and Paris
Archives respectively, the fault report points (5) are the same stations, the system
has been routed (6) in the 12th primary block between Paris and London on timeslot
number 3, there is no information to be recorded about association (7), equipment
information (8) and use (9), there is no satellite involved (10), composition  of
transmission (11) is digital.

The designation:

       London-Paris 64K1

Related Information:

       1.   1;
       2.   GBR, FRA;
       3.   BTI, FRATEL;
       4.   CS: London/SM,
            SCS1: Paris/ARC;
       5.   London/SM, Paris/ARC;
       6.   London-Paris 30N12/3;
       7.   -;
       8.   -;
       9.   -;
       10.  -;
       11.  N;
       12.  -;
       13.  A4: London-Paris NP12,
            B4: London-Toulouse NP3,


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            C4: -,
            D4: Dublin-Paris NP6,
            E4: London-Paris NP11,
            F4: London-Paris NP14;





















































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                            AP IX-32-E


                                      Annex

                            (to Recommendation M.140)


Paragraph                 Type of international route

1.2.2            Telephone circuits used in manual operation

1.2.3            Telephone circuits used for semi-automatic or automatic operation

1.2.4            Both way telephone circuits used for semi-automatic or automatic
                 operation

1.3              Circuits used for switched telex and telegraph service

1.4              Circuits in the international public switched data network

3.2.2            Analogue leased circuit used for telephony

3.2.3.1          Analogue circuits used for voice-frequency telegraphy

3.2.3.2          Analogue leased circuits used for TDM-telegraphy

3.2.4            Leased telegraph circuits

3.2.5            Analogue leased circuits used for data transmission

3.2.6            Analogue leased circuits used for phototelegraphy or facsimile

3.2.7.1           Analogue  leased  unidirectional  sound-programme  transmission
                 circuits

3.2.7.2          Analogue leased reversible sound-programme transmission circuits

3.2.8.1          Analogue leased unidirectional television programme circuits

3.2.8.2          Analogue leased reversible television programme circuits

3.2.9            Leased circuits used for digital video transmission

3.2.10           Analogue leased circuits connection circuit multiplication terminal
                 equipment at renters' premises

3.1.11           Analogue leased circuits used for a multiple kind of transmission
                 etc.

3.2.12           Analogue leased circuits connecting three or more locations

3.2.13           Leased analogue groups, supergroups etc.

3.2.14           Leased analogue group, supergroup and line links

3.2.15           Digital leased circuits connecting two locations



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3.2.16           Digital leased circuits connecting three or more locations

3.3.2.1           Public  circuits  used   for   unidirectional   sound-programme
                 transmission

3.3.2.2          Public circuits used for reversible sound-programme transmission

3.3.2.3          Public circuits used for narrow-band sound-programme transmission

3.3.3.1          Public circuits used for unidirectional television transmission

3.3.3.2          Public circuits used for reversible television transmission

3.3.4            Public circuits for digital audio and video transmission

3.3.5            Public telephone  type  circuits  used  for  phototelegraphy  or
                 facsimile

3.3.6            Telephone type circuits used to provide voice frequency telegraph
                 links

3.3.7            Telephone type circuits used to provide Time Division  Multiplex
                 telegraph systems

3.3.8            Telephone type circuits used for data transmission

3.3.9            Telephone type circuits used as transfer links for common channel
                 Signalling Systems Nos. 6 and 7

5.2.1            Groups (bidirectional)

5.2.2            Supergroups (bidirectional)

5.2.3            Mastergroups (bidirectional)

5.2.4            Supermastergroups (bidirectional)

5.2.6            Restoration groups and supergroups (bidirectional)
5.3.1            Multiple destination undirectional groups and supergroups

5.3.2            Single destination unidirectional groups and supergroups

6.1.1            Conventional group and supergroup links

6.1.2            Restoration links

6.2              Line links

8.2              Bidirectional digital blocks

8.3              Restoration digital blocks

8.4              Multiple destination unidirectional digital blocks

8.5              Single destination unidirectional digital blocks


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9.1              Conventional digital paths

9.2              Restoration digital paths

10.1.1           Groups and supergroups etc., on a mixed analogue/digital route

10.1.2           Digital blocks and paths on a mixed analogue/digital route

10.2             Routes with two analogue to digital conversions

11.1             Data transmission systems

11.2             Data transmission links













































CCITT/AP-IX/DOC/32E4.TXS