Nortel DMS-100 Series Maintenance Manual page 244

8-2 Troubleshooting chart
Table 8-1 Star Hub alarm clearing (Sheet 1 of 3)
Alarm
Condition Possible cause
Critical Star Hub remote controller pack (RCP)
cards in both Star Hub units has faults.
Power converter cards in both Star Hub
units have faults.
All DS-1 message ports are closed.
At least one of the Talk Battery filters
circuit breakers is down.
297-8353-550 Standard 05.01 March 2001
Action
Identify and post the system busy (SysB)
Star Hub.
Busy both units of the Star Hub with faults.
Test and return to service (RTS) the Star
Hub with faults.
Replace cards in card list, if displayed.
Use the correct card replacement
procedures.
If an RTS fails, load the Star Hub.
RTS the Star Hub.