ITU-T G 724-1993 CHARACTERISTICS OF A 48-CHANNEL LOW BIT RATE ENCODING PRIMARY MULTIPLEX OPERATING AT 1544 kbit s《工作在1544kbit s的48路低比特率编码基群复用设备的特性》.pdf

1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU%.%2!,G0G0!30%#43G0G0/ii) loss of 1544 kbit/s frame alignment;iii) 1544 kbit/s alarm indication signal (AIS) received;iv) 1544 kbit/s alarm indication received from the remote end.5.4.2 Consequent actions assoc

2、iated with stream ZUpon detection of 1544 kbit/s fault conditions in stream Z, appropriate actions should be taken which are inaccordance with 4.2 of Recommendation G.733. In addition, the following consequent actions should be taken asindicated in Table 2/G.724:i) declare a 1544 kbit/s alarm on the

3、 receive side of port Z;ii) send a 1544 kbit/s alarm indication to the remote end on the send side of port Z in accordance with 4.2.4of Recommendation G.733;iii) declare a remote 1544 kbit/s alarm on the receive side of port Z.5.4.3 Fault conditions associated with the signalling grouping channelA s

4、ummary of the signalling grouping channel fault conditions associated with the receive side of stream Z andFascicle III.4 - Rec. G.724 5the consequent actions are listed In Table 3/G.724.The transcoder shall detect the following signalling grouping channel fault conditions associated with stream Z.i

5、) loss of signalling grouping channel multiframe alignment on a single time-slot grouping;ii) remote time-slot grouping alarm indication (M1) receive from the remote end on a single time-slotgrouping;iii) signalling grouping channel AIS (M2) receive from the remote end on a single time-slot grouping

6、;iv) Remote signalling grouping channel AIS (M3) received from the remote end on a single time-slotgrouping.TABLE 2/G.7241544 kbit/s fault conditions associated with stream Z and consequent actionsConsequentactionsFault conditionsDeclare1544 kbit/salarm on Z(i)Send 1544 kbit/salarm indication toremo

7、te end on Z(ii)Declare remote1544 kbit/salarm on Z(iii)Loss of incoming signal at1544 kbit/s(i)Yes YesLoss of 1544 kbit/s frame alignment(ii) Yes Yes1544 kbit/s AIS received(iii) Yes Yes1544 kbit/s alarm indication receivedfrom remote end(iv)Yes5.4.4 Consequent actions associated with the signalling

8、 grouping channelUpon detection of signalling grouping channel fault conditions in stream Z, the following consequent actionsshall be taken as indicated in Table 3/G.724:i) declare a time-slot grouping alarm on the associated time-slot grouping;ii) send a time-slot grouping alarm indication to the r

9、emote end by forcing the M1bit within the affectedsignalling grouping channel to 1;iii) condition the data in the affected channels on the receive side of streams A to provide a signal that iscompatible with downstream equipment;iv) condition the channel-associated signalling in affected channels on

10、 the receive side of stream A to providea signalling that is compatible with downstream equipment;6 Fascicle III.4 - Rec. G.724v) declare a remote time-slot grouping alarm condition on the associated time-slot grouping to indicate thereception of a remote time-slot grouping alarm indication to the M

11、1bit of the affected signalling groupingchannel;vi) declare a signalling grouping channel AIS condition on the associated time-slot grouping to indicate thereception of a signalling grouping channel AIS indication in the M2bit of the affected signalling roupingchannel;vii) declare a remote signallin

12、g grouping channel AIS condition on the associated time-slot grouping toindicate the reception of a remote signalling grouping channel AIS indication in the M3bit of the affectedsignalling grouping channel.5.5 JitterFor further study.Fascicle III.4 - Rec. G.724 7TABLE 3/G.724Signalling grouping chan

13、nel fault conditions associated with stream Z and consequent actionConsequentactionsFault conditionsDeclaretime-slotgroupingalarm(i)Send time-slotgrouding alarmindication toremote end(ii)Conditionaffected channelson A(iii)Conditionsignalling inaffected channelson A(iv)Declare remotetime-slotgrouping

14、alarm(v)DeclaresignallinggroupingchannelAIS(vi)Declare remotesignallinggroupingchannel AIS(vii)Loss of signalling grouping channelmultiframe alignment(single time-slot grouping)(i)Yes Yes Yes YesRemote time-slot grouping alarm indicationreceived(single time-slot grouping)(ii)Yes Yes YesSignalling grouping channel AIS received(single time-slot grouping)(iii)Yes Yes YesRemote signalling grouping channel AISreceived(single time-slot grouping)(iv)Yes Yes Yes