STRAT-3 (Stratum-3 Clock)
Issue 1 May 2002
8-1501
555-233-143
f. This error type corresponds to FAIL code 16 of the Stratum-3 Clock Alarm
Query test (#649): every power supplied failed.
g. This error type corresponds to FAIL code 32 of the Stratum-3 Clock Alarm
Query test (#649): every clock unit failed.
h. An OFF-BOARD alarm on the Stratum-3 clock, indicates a DS1 facility
problem; an ON-BOARD alarm indicates a fault in either the Stratum-3
clock or the connection between the Stratum-3 clock and the switch. If the
Stratum-3 clock cannot be referenced and the local oscillator on the TN780
Tone-Clock circuit pack must serve as the reference, a Major alarm is
raised. Otherwise, a Minor alarm is raised.
i. This error can be caused by one of the following conditions:
■
One or both TOCs (Timing Output Cards) has failed.
■
The connection between the Stratum-3 clock and the TN780
Tone-Clock circuit pack is faulty.
■
The TN780 Tone-Clock circuit pack is defective.
A Minor alarm results if the Stratum-3 clock can still provide timing to the
switch; otherwise, a Major alarm will be raised because the Stratum-3 clock
is not providing timing and the switch is referencing the local oscillator on
the TN780 Tone-Clock circuit pack. If only the active TN780 Tone-Clock
circuit pack is faulty, the standby TN780 Tone-Clock circuit pack becomes
active and remains synchronized to the Stratum-3 clock. When the system
switches to the standby Tone-Clock circuit pack, the alarm is resolved, and
a TDM-CLK alarm is raised to indicate a possible problem on the TN780
Tone-Clock circuit pack.
If the alarm is minor:
Look for a red LED on either or both TOC cards. If there is a red
LED, then replace the card. If there is no red LED, then, using the
Stratum-3 Wiring Guide, check that the wiring installation is correct.
After replacing the card or correctly rewiring the installation, clear
the alarm by first issuing the disable synchronization-switch
command followed by the enable synchronization-switch
command. The latter procedure will cause synchronization software
to switch back to using the Stratum-3 clock again. Wait 2 minutes
and then execute the command. If Maintenance Name on the
status screen shows ‘‘STRAT-3,’’ then the problem is resolved.
!
CAUTION:
The disable synchronization-switch command followed by the
enable synchronization-switch command may cause slip alarms.
The circuit packs that can experience slips and the associated error
log entry for slips are as follows.
Summary of Contents for S8700 Series
Page 50: ...Maintenance Architecture 555 233 143 1 26 Issue 1 May 2002 ...
Page 74: ...Initialization and Recovery 555 233 143 3 12 Issue 1 May 2002 ...
Page 186: ...Alarms Errors and Troubleshooting 555 233 143 4 112 Issue 1 May 2002 ...
Page 232: ...Additional Maintenance Procedures 555 233 143 5 46 Issue 1 May 2002 ...
Page 635: ...status psa Issue 1 May 2002 7 379 555 233 143 status psa See status tti on page 7 406 ...
Page 722: ...Maintenance Commands 555 233 143 7 466 Issue 1 May 2002 ...