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52 Chapter 5 R2MFC card maintenance
N0087114 1.0
Alarms propagation
This section describes the actions taken when alarms occur or stop. When alarms occur, the
far-end is alerted by a remote alarm indication, and an alarm is transmitted on the opposite link.
Table 9 table shows the reactions for Group I alarms when they enter the Out-Of-Service (OOS)
state.
Table 10 shows the reactions for Group II alarms when they persist.
Loss of CRC-4 Multiframe
Alignment (OOM)
CRC-4 multiframe cannot be recognized. When this alarm is active,
CRC-4 errors (of group I) cannot be measured. This alarm is relevant
only when CRC-4 multiframe mode is used.
Remote Alarm Indication (RAI) Indication that the far-end has trouble with its incoming signal. This
alarm is also known as yellow alarm.
Remote Alarm Indication TS16
(RAI
TS16
)
Indication that the far-nd has lost TS16 multiframe alignment on its
incoming signal.
This alarm is not applicable to PRI (internal link).
Table 9 Group I Alarms propagation
Error Condition Alarm Transmitted to far end Alarm sent on opposite link
BPV RAI AIS
FBER RAI AIS
Slips RAI AIS
CRC-4 errors RAI AIS
FEBE none none
Table 10 Group II alarms propagation
Error Condition Alarm Transmitted to far-end Alarm sent on opposite link
LOS RAI AIS
AIS RAI AIS
OOF RAI AIS
OOM
TS16
RAI
TS16
AIS
AIS
TS16
RAI
TS16
AIS
RAI None RAI
RAI
TS16
None RAI
TS16
DCH down None AIS
Table 8 Incoming signal errors (Sheet 2 of 2)
Alarm Cause