Nortel DMS-100 Series Maintenance Manual page 590

11-2 Troubleshooting chart
Table 11-1 OPM alarm clearing (Sheet 1 of 3)
Alarm condition
Critical
297-8361-550 Standard 04.01 September 2000
Possible cause
Defective line concentrating module
(LCM) processor cards in both LCM
units
Defective power converter cards in
both LCM units
All DS30A message ports are closed.
Action
Identify and post the system busy
(SysB) LCM.
Busy both units of the defective LCM.
Return to service (RTS) the defective
LCM.
If an RTS fails, load the defective
LCM.
Test and RTS the defective LCM.