home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
InfoMagic Standards 1994 January
/
InfoMagic Standards - January 1994.iso
/
ccitt
/
1988
/
troff
/
6_8_11.tro
< prev
next >
Wrap
Text File
|
1991-12-13
|
13KB
|
787 lines
.rs
.\" Troff code generated by TPS Convert from ITU Original Files
.\" Not Copyright ( c) 1991
.\"
.\" Assumes tbl, eqn, MS macros, and lots of luck.
.TA 1c 2c 3c 4c 5c 6c 7c 8c
.ds CH
.ds CF
.EQ
delim @@
.EN
.nr LL 40.5P
.nr ll 40.5P
.nr HM 3P
.nr FM 6P
.nr PO 4P
.nr PD 9p
.po 4P
.rs
\v | 5i'
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy28/Q.764 (Feuillet 1 sur 2), (N), p. 1\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 39P
.ad r
\fBFigure B\(hy28/Q.764 (Feuillet 2 sur 2), (N), p. 2\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 43P
.ad r
\fBFigure B\(hy29/Q.764, (N), p. 3\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy30/Q.764, (N), p. 4\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy31/Q.764 (Feuillet 1 sur 6), (N), p. 5\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy31/Q.764 (Feuillet 2 sur 6), (N), p. 6\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy31/Q.764 (Feuillet 3 sur 6), (N), p. 7\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy31/Q.764 (Feuillet 4 sur 6), (N), p. 8\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy31/Q.764 (Feuillet 5 sur 6), (N), p. 9\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy31/Q.764 (Feuillet 6 sur 6), (N),\ \ \ A L'ITALIENNE, p. 10\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy32/Q.764 (Feuillet 1 sur 2), (N), p. 11\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 39P
.ad r
\fBFigure B\(hy32/Q.764 (Feuillet 2 sur 2), (N), p. 12\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy33/Q.764 (Feuillet 1 sur 3), (N), p. 13\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy33/Q.764 (Feuillet 2 sur 3), (N), p. 14\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy33/Q.764 (Feuillet 3 sur 3), (N), p. 15\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy34/Q.764, (N), p. 16\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy35/Q.764 (Feuillet 1 sur 3), (N), p. 17\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy35/Q.764 (Feuillet 2 sur 3), (N), p. 18\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy35/Q.764 (Feuillet 3 sur 3), (N), p. 19\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy36/Q.764 (Feuillet 1 sur 2), (N), p. 20\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 33P
.ad r
\fBFigure B\(hy36/Q.764 (Feuillet 2 sur 2), (N), p. 21\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy37/Q.764 (Feuillet 1 sur 6), (N), p. 22\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy37/Q.764 (Feuillet 2 sur 6), (N), p. 23\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 39P
.ad r
\fBFigure B\(hy37/Q.764 (Feuillet 3 sur 6), (N), p. 24\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy37/Q.764 (Feuillet 4 sur 6), (N), p. 25\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy37/Q.764 (Feuillet 5 sur 6), (N), p. 26\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 34P
.ad r
\fBFigure B\(hy37/Q.764 (Feuillet 6 sur 6), (N), p. 27\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy38/Q.764 (Feuillet 1 sur 2), (N), p. 28\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy38/Q.764 (Feuillet 2 sur 2), (N), p. 29\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure B\(hy39/Q.764, (N), p. 30\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 37P
.ad r
\fBFigure B\(hy40/Q.764, (N), p. 31\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce 1000
APPENDIX\ I
.ce 0
.ce 1000
(to Recommendation Q.764)
.sp 9p
.RT
.ce 0
.ce 1000
\fBContents of the interface elements between\fR
.sp 1P
.RT
.ce 0
.ce 1000
\fBthe ISDN user part and the SCCP\fR
.ce 0
.PP
These interface elements are defined in SCCP Recommendations (Q.711\(hyQ.716)
and are included here for information.
.sp 1P
.RT
.sp 1P
.LP
I.1
\fIContents of the REQUEST type 1\fR
.sp 9p
.RT
.PP
The REQUEST type 1 interface element may contain the following
parameters:
.RT
.LP
\(em
connection identification (for further study);
.LP
\(em
receipt confirmation selection;
.LP
\(em
expedited data selection;
.LP
\(em
quality of service parameter set.
.sp 1P
.LP
I.2
\fIContents of the REQUEST type 2\fR
.sp 9p
.RT
.PP
The REQUEST type 2 interface element may contain the following
parameters:
.RT
.LP
\(em
network indicator (for further study);
.LP
\(em
protocol class;
.LP
\(em
credit;
.LP
\(em
connection identification (for further study);
.LP
\(em
source local reference;
.LP
\(em
originating signalling point code;
.LP
\(em
reply request;
.LP
\(em
refusal indicator.
.sp 1P
.LP
I.3
\fIContents of the REPLY\fR
.sp 9p
.RT
.PP
The REPLY interface element may contain the following
parameters:
.RT
.LP
\(em
source local reference;
.LP
\(em
protocol class;
.LP
\(em
credit;
.LP
\(em
connection identification (for further study).
.sp 2P
.LP
\fBRecommendation\ Q.766\fR
.RT
.sp 2P
.ce 1000
\fBPERFORMANCE\ OBJECTIVES\ IN\ THE\ INTEGRATED\fR
.EF '% Fascicle\ VI.8\ \(em\ Rec.\ Q.766''
.OF '''Fascicle\ VI.8\ \(em\ Rec.\ Q.766 %'
.ce 0
.sp 1P
.ce 1000
\fBSERVICES\ DIGITAL\ NETWORK\ APPLICATION\fR
.ce 0
.sp 1P
.LP
\fB1\fR \fBIntroduction\fR
.sp 1P
.RT
.PP
This Recommendation gives the requirements of the Integrated
Services Digital Network (ISDN) application call control service supported
by Signalling System No.\ 7.
.PP
In Recommendation Q.706, the Message Transfer Part performance is
described. The Message Transfer Part supports the ISDN application of
Signalling System No.\ 7 and provision of a signalling network to support the
ISDN application must take account of the performance of the Message Transfer
Part and the requirements of the ISDN application. For example, taking
account of the message transfer times in Recommendation\ Q.706 and the
requirements for message transfer times between two ISDN exchanges, a figure
may be derived for the total permissible number of signalling links in
tandem for a particular
call.
.bp
.RT
.sp 2P
.LP
\fB2\fR \fBSignalling availability\fR
.sp 1P
.RT
.sp 1P
.LP
2.1
\fISignalling route set availability\fR
.sp 9p
.RT
.PP
The availability of a signalling route set is determined by the
availability of the individual components of the signalling network (signalling
links and the signalling points) and by the structure of a signalling
network.
.PP
The availability of a signalling route set should not be less than
0.99998, corresponding to a downtime of 10 minutes per year for a user
signalling relation.
.RT
.sp 1P
.LP
2.2
\fISignalling network availability\fR
.sp 9p
.RT
.PP
The availability of the signalling network should be sufficiently high
as to meet the signalling route set downtime objectives stated in
\(sc\ 2.1. The signalling network architecture selected will strongly
influence the availability. In general, the greater the number of link
sets in tandem in a signalling route set the more redundant signalling
paths that will be needed to meet the availability objective for the signalling
route set or
user signalling relation.
.RT
.sp 2P
.LP
\fB3\fR \fBSignalling dependability\fR
.sp 1P
.RT
.sp 1P
.LP
3.1
\fIGeneral\fR
.sp 9p
.RT
.PP
The ISDN application is different from other applications, such as telephony
and data, in that there may be multiple paths involved for any given ISDN
call. There may be several circuits (e.g.\ telephone conferencing) for
either telephony or data and non\(hycircuit related connections for access
to data bases or for terminal\(hyto\(hyterminal control. This diverse set
of uses may require closer control of the signalling network resources
than might be required for other more simple applications.
.RT
.sp 1P
.LP
3.1.1
\fIProbability of false operation\fR
.sp 9p
.RT
.PP
By means of error detection (see Recommendation\ Q.703) as well as transmission
fault indication (see Recommendations\ G.732\ [1] and G.733\ [2],
it is ensured that, overall, not more than one in 10\u8\d of all signal units
transmitted is accepted that, due to errors, will cause false
operation.
.RT
.sp 1P
.LP
3.2
\fIProbability of signalling malfunction\fR
.sp 9p
.RT
.PP
Unsuccessful calls may be caused by undetected errors, loss of
messages, or messages delivered out of sequence (during emergency situations
within the signalling network) and may result in:
.RT
.LP
\(em
incomplete call set\(hyup,
.LP
\(em
misrouted calls (e.g.\ connection of wrong numbers),
.LP
\(em
calls routed correctly but mishandled
(e.g.\ false clearing),
.LP
\(em
inability to access a data base.
.PP
Considering the above conditions and the performance for the
Message Transfer Part, no more than 2 in 10\u5\d (provisional value) of
all ISDN calls should be unsuccessful due to signalling malfunction.
.PP
\fINote\fR \ \(em\ No more than 1 in 10\u5\d of all ISDN \fIcircuit connections\fR
should be unsuccessful due to signalling malfunction.
.RT
.LP
.sp 5
.bp
.sp 2P
.LP
\fB4\fR \fBSignalling delay\fR
.sp 1P
.RT
.sp 1P
.LP
4.1
\fIFunctional reference points and transfer time components\fR
.sp 9p
.RT
.LP
.rs
.sp 9P
.ad r
\fBFigure ccitt\(hy35600, (M), p.\fR
.sp 1P
.RT
.ad b
.RT
.sp 2P
.LP
4.2
\fIDelays\fR
.sp 1P
.RT
.sp 1P
.LP
4.2.1
\fBcross\(hyoffice transfer time, T\fR\(da\fBc\fR\(da\fBu\fR
.sp 9p
.RT
.PP
\fIT\fR\d\fIc\fR\\d\fIu\fR\uis the period which starts when the last bit of the
signal unit leaves the incoming signalling data link and ends when the
last bit of the signal unit enters the outgoing signalling data link for
the first time. It therefore includes the queuing delay in the absence
of disturbances but not the additional queuing delay caused by retransmission.
.RT
.sp 1P
.LP
4.2.2
\fBuser handling time, T\fR\(da\fBh\fR\(da\fBu\fR
.sp 9p
.RT
.PP
\fIT\fR\d\fIh\fR\\d\fIu\fR\uis the period which starts when the last bit of the
message has entered the upper layer functions and ends when the last bit
of the derived message has left the upper layer functions.
.RT
.sp 1P
.LP
4.2.3
\fIObjectives for cross\(hyoffice transfer time, T\fI\d\fIc\fR\\d\fIu\fR\u
.sp 9p
.RT
.PP
The figures in Table 1/Q.766 are the objectives for the
cross\(hyoffice transfer time \fIT\fR\d\fIc\fR\\d\fIu\fR\ufor the ISDN
signalling points in the
signalling network. These figures are related to a signalling bit rate of
64\ kbit/s.
.RT
.ce
\fBH.T. [T1.766]\fR
.ce
TABLE\ 1/Q.766 | u1\d\u)\d
.T&
lw(60p) | lw(60p) | lw(30p) | lw(30p) .
.TE
.nr PS 9
.RT
.ad r
\fBTableau 1/Q.766 [T1.766], p.\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.PP
A processing intensive message is one that arrives at an exchange and requires
detailed examination (and possibly modification) before it is
transmitted to the next exchange.
.PP
A simple message is one that requires little or no examination or
modification (typically only label translation) before it is transmitted
to the next exchange.
.RT
.sp 1P
.LP
4.3
\fIEffect of retransmission\fR
.sp 9p
.RT
.PP
As a consequence of correction by retransmission, not more than one in
10\u4\d signals should be delayed more than 300\ ms as a long\(hyterm average.
This requirement refers to each signalling link.
.PP
This requirement is laid down in order to ensure satisfactory answer delays.
.RT
.LP
\fB5\fR \fBSignalling system limitations\fR
.sp 1P
.RT
.sp 2P
.LP
5.1
\fILabelling potential\fR
.sp 1P
.RT
.sp 1P
.LP
5.1.1
\fISignalling points\fR
.sp 9p
.RT
.PP
The label of the Signalling System No.\ 7 for the ISDN application provides
the potential to identify
16 | 84 signalling points.
.RT
.sp 1P
.LP
5.1.2
\fINumber of circuits in a user signalling relation\fR
.sp 9p
.RT
.PP
There may be up to 4096 circuits (4096 channels in each direction) for
each user signalling relation.
.RT
.sp 1P
.LP
5.1.3
\fINumber of SCCP connections in a user signalling relation\fR
.sp 9p
.RT
.PP
There may be up to 2\u2\d\u4\d SCCP connections available at an ISDN signalling
point. All of these may be available for any given user signalling relation,
but must be shared over all signalling relations.
.RT
.sp 1P
.LP
5.2
\fINumber of ISDN call identities at a signalling point\fR
.sp 9p
.RT
.PP
There may be up to 2\u2\d\u4\d (value for further study) simultaneous ISDN
calls at a signalling point with the 2\u2\d\u4\d call identities available.
The use of ISDN call identities is for further study.
.RT
.sp 2P
.LP
\fBReferences\fR
.sp 1P
.RT
.LP
[1]
CCITT Recommendation \fICharacteristics of primary PCM multiplex\fR
\fIequipment operating at 2048\ kbit/s\fR , Rec.\ G.732.
.LP
[2]
CCITT Recommendation \fICharacteristics of primary PCM multiplex\fR
\fIequipment operating at 1544\ kbit/s\fR , Rec.\ G.733.
.LP
.rs
.sp 9P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.LP
\fBMONTAGE : PAGE 438 = PAGE BLANCHE\fR
.sp 1P
.RT
.LP
.bp