The performance limits for data transmission systems operating at bit rates above 64 kbit/s require further study.
.LP
\fINote\fR
\ \(em\ See Note to Table 4/M.1370.
.nr PS 9
.RT
.ad r
\fBTable 1/M.1370 [T1.1370], p.\fR
.sp 1P
.RT
.ad b
.RT
.ce
\fBH.T. [T2.1370]\fR
.ce
TABLE\ 2/M.1370
.ce
\fBLimits for error free seconds (EFS) on national or
.ce
\fBinternational\fR
.ce
\fBsections of international 48\(hy64\ kbit/s
.ce
\fBdata transmission links\fR
.ce
| ua\d\u)\d
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(60p) | cw(36p) | cw(60p) | cw(60p) .
Performance classification Errors in 1\ second {
Permitted percentage of measurement time
} {
Permitted number of seconds in measurements time
of one\ hour
}
_
.T&
lw(60p) | cw(36p) | lw(60p) | cw(60p) .
Errored seconds > 0 Less than 8% < 288\
_
.T&
lw(60p) | cw(36p) | lw(60p) | cw(60p) .
Error\(hyfree seconds > 0 More than 92% > 3312
.TE
.LP
\ua\d\u)\d
The performance limits for data transmission systems operating at bit rates above 64\ kbit/s require further study.
.LP
\fINote\fR
\ \(em\ See Note to Table 4/M.1370.
.nr PS 9
.RT
.ad r
\fBTable 2/M.1370 [T2.1370], p.\fR
.sp 1P
.RT
.ad b
.RT
.sp 2P
.LP
4.4
\fIEnd\(hyto\(hyend system tests\fR
.sp 1P
.RT
.PP
4.4.1
Following the satisfactory testing of the national and
international sections an end\(hyto\(hyend performance test between renter's
premises should be made. It is essential that the operational conditions
for the tests are the same as when the circuit is in service.
.sp 9p
.RT
.PP
4.4.2
The test pattern should be applied simultaneously at both of the renter's
premises and measured at the opposite ends. A minimum test period of 24\
hours should be the objective.
.bp
.PP
4.4.3
The
bit error ratio (BER)
limits to be achieved are given in Table\ 3/M.1370. The
error free second (EFS)
limits are given in
Table\ 4/M.1370.
.ce
\fBH.T. [T3.1370]\fR
.ce
TABLE\ 3/M.1370
.ce
\fBEnd\(hyto\(hyend bit error ratio limits for the system\fR
.ce
| ua\d\u)\d
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(42p) | cw(42p) | cw(60p) .
Data rate (kbit/s) Error ratio Errors in 15\ min
_
.T&
cw(42p) | cw(42p) | cw(60p) .
48 2.1 \(mu 10\uD\dlF261\u6\d \ 90
.T&
cw(42p) | cw(42p) | cw(60p) .
50 2.1 \(mu 10\uD\dlF261\u6\d \ 95
.T&
cw(42p) | cw(42p) | cw(60p) .
56 2.1 \(mu 10\uD\dlF261\u6\d 105
.T&
cw(42p) | cw(42p) | cw(60p) .
64 2.2 \(mu 10\uD\dlF261\u6\d 122
.TE
.LP
\ua\d\u)\d
The performance limits for data transmission systems operating
at bit rates above 64\ kbit/s require further study.
.LP
\fINote\fR
\ \(em\ See Note to Table 4/M.1370.
.nr PS 9
.RT
.ad r
\fBTable 3/M.1370 [T3.1370], p.\fR
.sp 1P
.RT
.ad b
.RT
.PP
4.4.4
It should be the objective that all 15 minute periods of the tests meet
the required bit error ratio limit. The circuit
control station
and
sub\(hycontrol station
should together consider the results of the
performance tests to decide if the circuit is acceptable for service. Thus,
one or two 15\ minute periods not meeting the standard may not preclude
the circuit from being put into service whereas a regular pattern of 15\
minute periods only just meeting the standard may indicate a need for investigation.
If such is the case, the additional parameters listed in \(sc\ 5.1 may
offer some assistance.
.PP
4.4.5
The end\(hyto\(hyend error performance objectives for a measuring
period of 24\ hours are shown in
Table\ 4/M.1370. These objectives
are based on those defined in Recommendation\ G.821, \(sc\ 2\ [7].
.ce
\fBH.T. [T4.1370]\fR
.ce
TABLE\ 4/M.1370
.ce
\fBSystem end\(hyto\(hyend error performance objectives for EFS
.ce
measurements\fR
.ce
| ua\d\u)\d
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(60p) | cw(36p) | cw(60p) | cw(60p) .
Performance classification Errors in 1\ second {
Permitted percentage of measurement time (24\ hours)
} {
Permitted number of seconds in measurements time
of 24\ hours
}
_
.T&
lw(60p) | cw(36p) | lw(60p) | cw(60p) .
Errored seconds > 0 Less than 8% \ 6 | 12
_
.T&
lw(60p) | cw(36p) | lw(60p) | cw(60p) .
Error free seconds > 0 More than 92% 79 | 88
.TE
.LP
\ua\d\u)\d
The performance objectives for data transmission systems operating at bit rates above 64\ kbit/s require further study.
.LP
\fINote\fR
\ \(em\ The limits presented in the tables for error\(hyfree seconds (EFS) are
based on those given in Recommendation\ G.821 | 7] and those for bit error ratio (BER) on the experience of Administrations. These limits are provisional and
are subject for further study.
.nr PS 9
.RT
.ad r
\fBTable 4/M.1370 [T4.1370], p.\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.sp 2P
.LP
\fB5\fR \fBMeasurements of other parameters\fR
.sp 1P
.RT
.PP
5.1
If after applying the procedures described or identified in
\(sc\(sc\ 2 to\ 4 the appropriate bit error ratio or error free seconds
limits cannot be met, then measurement of the additional parameters, clock
frequency, clock slip, short interruptions in transmission and buffer overflow,
may offer some indications as to why the limits are not met and to what
action should be
taken.
\v'2P'
.sp 9p
.RT
.ce 1000
ANNEX\ A
.ce 0
.ce 1000
(to Recommendation M.1370)
.sp 9p
.RT
.ce 0
.ce 1000
\fBDesignation information on international data transmission systems\fR
.sp 1P
.RT
.ce 0
.LP
A.1
\fIDesignation\fR
.sp 1P
.RT
.PP
The designation is according to Recommendation M.140 [1], \(sc\ 11 (for
use between Administrations) or \(sc\ 3.2.15 (for private use).
.RT
.sp 1P
.LP
A.2
\fIRelated information\fR
.sp 9p
.RT
.LP
RI 1.
Urgency for restoration;
.LP
RI 2.
Terminal countries;
.LP
RI 3.
Administrations', carriers' or broadcasting companies'
names;
.LP
RI 4.
Control and sub\(hycontrol station(s);
.LP
RI 5.
Fault report points;
.LP
RI 6.
Routing;
.LP
RI 7.
Association;
.LP
RI 8.
Equipment information;
.LP
RI 9.
Use;
.LP
RI 10.
Transmission medium information;
.LP
RI 11.
Composition of transmission;
.LP
RI 12.
(Empty item, use: \*Q\(em;\*U);
.LP
RI 13.
Occupancy.
.PP
The various items will be dealt with in \(sc\ 12 of
Recommendation\ M.140\ [1].
.sp 2P
.LP
\fBReferences\fR
.sp 1P
.RT
.LP
[1]
CCITT Recommendation \fIDesignation of international circuits,\fR
\fIgroups and line links, digital blocks, digital paths, data transmission\fR
\fIsystems and related information\fR , Vol.\ IV, Rec.\ M.140.
.LP
[2]
Intelsat Satellite Systems Operations Guide (INTELSAT\(hySSOG).
.LP
[3]
CCITT Recommendation \fIBringing international digital blocks, paths\fR
\fIand sections into service\fR , Vol.\ IV, Rec.\ M.555.
.LP
[4]
CCITT Recommendation \fICharacteristics of distortion and error\(hyrate\fR
\fImeasuring apparatus for data transmission\fR , Vol.\ VIII, Rec.\ V.52.
.LP
[5]
CCITT Recommendation \fIComprehensive data test set for high data\fR
\fIsignalling rates\fR , Vol.\ VIII, Rec.\ V.57.
.LP
[6]
CCITT Recommendation \fIData transmission at 48 kbit/s\fR \fIusing 60\(hy108
kHz group band circuits\fR , Vol.\ VIII, Rec.\ V.35.
.LP
[7]
CCITT Recommendation \fIError performance on an international digital\fR
\fIconnection forming part of an integrated services digital network\fR ,