Locating And Clearing Faults; Performing Fault Isolation Tests - Nortel DMS-100 Series Maintenance Manual

Table 7-13 Star Module log reports (Sheet 4 of 4)
Log
report Reason for output
ISDN108 TEI restore successful
ISDN109 D-channel restored
ISDN115 Subscription limits
exceeded
ISDN116 TEI has not been
assigned

Locating and clearing faults

The standard troubleshooting steps for locating and clearing faults follow:
1. Silence audible alarms caused by the system when alarm conditions are
2. Isolate the fault by reading status displays and tracing fault codes to the
3. Busy the hardware to remove system access to the faulty component. This
4. Test the faulty component and identify the card to be replaced. Replace
5. Return the hardware to service.

Performing fault isolation tests

When a fault condition is detected in the Star Hub, a maintenance action is
required. Fault isolation tests are used to determine which component is
causing the fault. It also corrects the fault condition or reports it to the
Meaning
This log report is output when
the system restores a TEI.
This log report is output when
the system restores a
D-channel.
This log report is output when
the subscription counters that
represent the maximum
allowable links for a specific
set of TEI values would be
exceeded by the attempted
TEI assignment.
This log report is output when
the action identifier is a TEI
value that has not previously
been assigned to a terminal on
the loop.
detected.
menu level needed to clear the fault.
allows maintenance activity to be performed without system interference.
the faulty card and test it again.
DMS-100 Family NA100 Star Remote System XPM15 and up
Star Remote System manual maintenance 7-17
Action
Run a SUSTATE test to
ensure communication
has been established
with the restored
D-channel.
Run a SUSTATE test to
ensure communication
has been established
with the restored
D-channel.
Perform the TEI audit.
Identify the denied
message and perform a
TEI audit.