Table 3/G.761 indicates the content of TS16 in frames 1 to 15.
.PP
This allocation of bits provides each 32 kbit/s channel with two
signalling channels at 500\ bit/s nominated \*Qa\*U and \*Qb\*U as defined in
Recommendation\ G.704, \(sc\ 5.1.3.2.2.
.PP
To minimize the risks of simulation of the multiframe alignment
signal, special processing of certain signalling bits is carried out as
described in \(sc\ 2.5.1.1.3.
.PP
In the case of direct transfer of some 64 kbit/s time slots of PCM
streams\ A or\ B, the four bits of TS16 associated with the transferred time
slots will be transparently transmitted and allocated in accordance with
Table\ 7/G.704. They will not be subject to the special processing described
in \(sc\ 2.5.1.1.3. The four bits of time slot\ 16 associated with each
of the time
slots not used in PCM streams\ A and\ B because of the direct transfer will be
restituted by the transcoder with the following values:
.PP
a = 0; b = 1; and d = 1, in conformity with Table 9/G.704.
.PP
The signalling distortion of any signalling channel will not be
greater than \(+- | \ ms.
.RT
.ce
\fBH.T. [T3.761]\fR
.ce
TABLE\ 3/G.761
.ce
\fBContent of TS16 frames 1 to 15\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(66p) | lw(24p) | lw(24p) | lw(24p) | lw(24p) .
Time slot 16 bit number 1 2 3 4 5 6 7 8
_
.T&
cw(66p) | lw(24p) | lw(24p) | lw(24p) | lw(24p) .
Signalling Channel a b Channel a b Channel a b Channel a b
_
.T&
lw(66p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
Frame 1 \ 1A \ 2A 15B 16B
_
.T&
lw(66p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
Frame 2 \ 1B \ 2B 17A 18A
_
.T&
lw(66p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
Frame 3 \ 3A \ 4A 17B 18B
_
.T&
lw(66p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
Frame 4 \ 3B \ 4B 19A 20A
_
.T&
lw(66p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
Frame 5 \ 5A \ 6A 19B 20B
_
.T&
lw(66p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
Frame 6 \ 5B \ 6B 21A 22A
_
.T&
lw(66p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
Frame 7 \ 7A \ 8A 21B 22B
_
.T&
lw(66p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
Frame 8 \ 7B \ 8B 23A 24A
_
.T&
lw(66p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
Frame 9 \ 9A 10A 23B 24B
_
.T&
lw(66p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
Frame 10 \ 9B 10B 25A 26A
_
.T&
lw(66p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
Frame 11 11A 12A 25B 26B
_
.T&
lw(66p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
Frame 12 11B 12B 27A 28A
_
.T&
lw(66p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
Frame 13 13A 14A 27B 28B
_
.T&
lw(66p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
Frame 14 13B 14B 29A 30A
_
.T&
lw(66p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
Frame 15 15A 16A 29B 30B
.TE
.LP
\fINote\fR
\ \(em\ The organization of the multiframe ensures consistency with the frame and multiframe organization of Recommendation\ G.704, \(sc\ 5.1.3 and allows the
possibility of the mixed use in stream\ C of 32\ kbit/s and 64\ kbit/s channels
with their associated signalling.
.nr PS 9
.RT
.ad r
\fBTable 3/G.761 [T3.761], p.\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.sp 1P
.LP
2.5.1.1.3
\fISpecial processing of signalling bits\fR
.sp 9p
.RT
.PP
The signalling bits to be transmitted in bit 2 (respectively 4, 6 and\
8) of TS16 (frames\ 1 to\ 15) are calculated from B\fI\fI\d\fIn\fR\\d\\u(em\d1\u,
The fault conditions associated with the frames of streams A, B
and\ C and the consequent actions, when the safeguarding option is not
used, are given in Table\ 8/G.761.
.PP
When channel associated signalling is used, the fault conditions
associated with the multiframes of streams\ A, B and\ C and their consequent
actions are given in Table\ 9/G.761.
.RT
.sp 1P
.LP
3.11.2
\fIWith safeguarding\fR
.sp 9p
.RT
.PP
When the safeguarding option is provided, Tables 8/G.761 and
9/G.761 must be used, with the exception of the fault condition \*Qtranscoder
failure\*U of Table\ 8/G.761. Instead, the fault conditions and consequent
actions given in Table\ 10/G.761 must be used, with reference to Figure\
2/G.761.
.RT
.LP
.rs
.sp 30P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T7.761]\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(180p) .
TABLE\ 7/G.761
.T&
cw(180p) .
{
\fBOrder of priority for the transfer of 64 kbit/s time\fR
\fBslots from streams A or B to stream C\fR
}
.TE
.TS
center box;
cw(60p) | cw(60p) | cw(60p) .
Time slot in stream A Time slot in stream B Time slot in stream C
_
.T&
cw(60p) | cw(60p) | cw(60p) .
\ 6 \ 5
_
.T&
cw(60p) | cw(60p) | cw(60p) .
\ 6 \ 6
_
.T&
cw(60p) | cw(60p) | cw(60p) .
22 22
_
.T&
cw(60p) | cw(60p) | cw(60p) .
22 23
_
.T&
cw(60p) | cw(60p) | cw(60p) .
14 13
_
.T&
cw(60p) | cw(60p) | cw(60p) .
14 14
_
.T&
cw(60p) | cw(60p) | cw(60p) .
30 30
_
.T&
cw(60p) | cw(60p) | cw(60p) .
30 31
_
.T&
cw(60p) | cw(60p) | cw(60p) .
\ 2 \ 1
_
.T&
cw(60p) | cw(60p) | cw(60p) .
\ 2 \ 2
_
.T&
cw(60p) | cw(60p) | cw(60p) .
18 18
_
.T&
cw(60p) | cw(60p) | cw(60p) .
18 19
_
.T&
cw(60p) | cw(60p) | cw(60p) .
10 9
_
.T&
cw(60p) | cw(60p) | cw(60p) .
10 10
_
.T&
cw(60p) | cw(60p) | cw(60p) .
26 26
_
.T&
cw(60p) | cw(60p) | cw(60p) .
26 27
_
.T&
cw(60p) | cw(60p) | cw(60p) .
\ 4 \ 3
_
.T&
cw(60p) | cw(60p) | cw(60p) .
\ 4 \ 4
_
.T&
cw(60p) | cw(60p) | cw(60p) .
20 20
_
.T&
cw(60p) | cw(60p) | cw(60p) .
20 21
_
.T&
cw(60p) | cw(60p) | cw(60p) .
12 11
_
.T&
cw(60p) | cw(60p) | cw(60p) .
12 12
_
.T&
cw(60p) | cw(60p) | cw(60p) .
28 28
_
.T&
cw(60p) | cw(60p) | cw(60p) .
28 29
_
.T&
cw(60p) | cw(60p) | cw(60p) .
\ 8 \ 7
_
.T&
cw(60p) | cw(60p) | cw(60p) .
\ 8 \ 8
_
.T&
cw(60p) | cw(60p) | cw(60p) .
24 24
_
.T&
cw(60p) | cw(60p) | cw(60p) .
24 25
_
.T&
cw(60p) | cw(60p) | cw(60p) .
17 (Note 1) 15
_
.T&
cw(60p) | cw(60p) | cw(60p) .
17 (Note 1) 17 (Note 2)
.TE
.LP
\fINote\ 1\fR
\ \(em\ This time slot does not comply with the normal priority ordering
given in Recommendation\ G.735, \(sc\ 2.
.LP
\fINote\ 2\fR
\ \(em\ Time slot 17 of stream C will not be available for direct transfer of time slot 17 of stream\ B when the PCM streams employ time slot 16\ channel
associated signalling with more than two signalling bits per channel
(see \(sc\ 2.5.1.2).
.nr PS 9
.RT
.ad r
\fBtableau 7/G.761 [T7.761], p. 8\fR
.sp 1P
.RT
.ad b
.RT
.LP
\fR .bp
.ce
\fBH.T. [1T8.761]\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ 8/G.761
.T&
cw(342p) .
{
\fBFault conditions on frames A, B and C and consequent\fR
\fBactions without safeguarding\fR
}
.TE
.TS
center box;
rw(60p) | cw(30p) | lw(24p) sw(24p) | lw(24p) sw(24p) | lw(24p) sw(24p) | lw(22p) sw(22p) | lw(16p) | lw(24p) sw(24p) , ^ | ^ | l | l | l s | ^ | ^ | ^ | ^ | ^ | ^ , ^ | ^ | ^ | ^ | l | l | l | l | l | l | l | l | l.
\ \(em\ The fault conditions associated with streams A, B and C are:
loss of signal, loss of frame alignment, error ratio greater than
10\uD\dlF261\u3\d as defined in Recommendation\ G.735, \(sc\ 4.1.
.LP
\fINote\ 2\fR
\ \(em\ Only in time slots and signalling bits associated with PCM
stream A (both for 32 and 64\ kbit/s channels).
.LP
\fINote\ 3\fR
\ \(em\ Only in time slots and signalling bits associated with PCM
stream B (both for 32 and 64\ kbit/s channels).
.LP
\fINote\ 4\fR
\ \(em\ The prompt maintenance alarm indication must be inhibited if the
AIS is detected at the corresponding port.
.LP
\fINote\ 5\fR
\ \(em\ The fault condition \*Qtranscoder failure\*U is detected by the
in\(hyservice monitoring unit. The transcoder is equipped with such a unit if the digital signal processing is time\(hymultiplexed between the 60\(hychannels.
.LP
\fINote\ 6\fR
\ \(em\ These fault conditions are not detected by the transcoder.
The indications pass transparently through the transcoder (see
\(sc\ 2.6.3).
.nr PS 9
.RT
.ad r
\fBtableau 8/G.761 [2T8.761], p. 10\ \ \ A L'ITALIENNE\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T9.761]\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ 9/G.761
.T&
cw(342p) .
{
\fBFault conditions on multiframes A, B and C and consequent\fR
\fBactions\fR
}
.TE
.TS
center box;
rw(60p) | cw(30p) | lw(24p) sw(24p) | lw(24p) sw(24p) | lw(24p) sw(24p) | lw(22p) sw(22p) | lw(16p) | lw(24p) sw(24p) , ^ | ^ | l | l | l | l | l | l | l | l | l | l | l.
\ \(em\ The fault condition associated with the three multiframes is the
loss of multiframe alignment.
.LP
\fINote\ 2\fR
\ \(em\ Only in signalling bits associated with PCM stream\ A. The 1111.... bits are processed in accordance with \(sc\ 2.5.1.1.3 and Tables\ 4/G.761 and
5/G.761.
.LP
\fI\fR
\fINote\ 3\fR
\ \(em\ Only in signalling bits associated with PCM stream\ B. The 1111.... bits are processed in accordance with \(sc\ 2.5.1.1.3 and Tables\ 4/G.761 and
5/G.761.
.LP
\fINote\ 4\fR
\ \(em\ The prompt maintenance alarm indication must be inhibited if the
AIS in TS16 is detected at the corresponding port.
.LP
\fINote\ 5\fR
\ \(em\ These fault conditions are not detected by the transcoder. The
indications pass transparently through the transcoder (see \(sc\ 2.6.6).
.nr PS 9
.RT
.ad r
\fBtableau 9/G.761 [T9.761], p. 11\ \ \ A L'ITALIENNE\fR
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T10.761]\fR
.ce
TABLE\ 10/G.761
.ce
\fBFault conditions and consequent actions when\fR
.ce
\fBimplementing the safeguarding option\fR
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
rw(90p) | lw(30p) sw(30p) | lw(30p) sw(30p) , ^ | l | l | l | l.
{
Consequent
actions
Fault conditions
Switching to the
safeguarding mode
AIS in PCM stream
not safeguarded
at (1)
at (2)
at (1)
at (2)
}
_
.T&
lw(90p) | cw(30p) | lw(30p) | cw(30p) | cw(30p) .
Transcoder failure at (1) Yes Yes if possible Yes
_
.T&
lw(90p) | cw(30p) | lw(30p) | cw(30p) | cw(30p) .
Power supply failure at (1) Yes Yes if possible Yes
_
.T&
lw(90p) | cw(30p) | cw(30p) | cw(30p) | cw(30p) .
{
TS0 stream C from (1) to (2) bits 7 and 8 in state\ 1
} Yes Yes
.TE
.LP
\fINote\fR
\ \(em\ The transcoder designations (1) and (2) are indicated in