Avaya CS 1000 Maintenance Manual page 155

This type of alarm may be caused by the following:
• Loss of Signal (LOS)
• Loss of Frame Alignment (LFAS)
• Loss of CRC-4 Multiframe Alignment (LMAS)
When the 2.0 Mb PRI is in a Red alarm state, RAI is transmitted to the far end.
For both Group 2 Red and Yellow alarm states, action is taken after the condition has persisted
for a downloaded persistence (PERS) threshold. The parameter is set in LD 73 in multiples of
2 msec, with 2 x 50 = 100 msec as the default.
For Group 2 Red alarm conditions, there are four definable time thresholds that can be set in
LD 73 on a per-loop basis. The first parameter sets an aggregate time in multiples of 128 msec
(default 20 = 2.5 sec). The next four parameters provide time thresholds for MAINT, NNDC,
NNC, and OOS.
For example, if the total cumulative time that an error has been present reaches the aggregate
time (2.5 sec default) in less than the time set in OOS, the card is put into an out-of-service
state. If it took more than the preset time for the error condition to register, the card could be
put into NNDC, NNC, or MAINT states. The card remains in the alarm condition until the error
has improved and after the Group 2 guard timers expire.
Define group 2 error thresholds
You can define Group 2 error thresholds in LD 73. Only the highest priority Group 2 alarm
condition is active at a time. The order of priority (from highest to lowest) is: LOS, AIS, LFAS,
LMAS, RAI.
Table 76: LD 73 - Define group 2 error thresholds
Prompt
REQ
TYPE
FEAT
...
GP2
ISDN Primary Rate Interface Maintenance
Response
NEW New
DTI2 2.0 Mb/s DTI data block
LPTI Loop Timer
20 100s 12s 12s
• 20 = Error count value
4s
• 100s = Maintenance threshold
• 12s = NNDC threshold
• 12s = NNC threshold
• 4s = OOS threshold
(Aggregate count default [20x128ms = 2.5sec])
Monitor system PRI operation
Description
November 2011 155