DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-1541STRAT-3 (Stratum 3 Clock)
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f. This error type corresponds to FAIL code 16 of the Stratum 3 Clock Alarm
Query (test #649): all power supp lies failed.
g. This error type corresponds to FAIL cod e 32 of the Stratum 3 Clock Alarm
Query (test #649): all clock unit (s) failed.
h. An OFF-BOARD alarm on the Stratum 3 clock, indicates a DS1 facility
problem; an ON-BOARD alarm indic ates a fault in either the Stratum 3
clock or the connec tion between the Stratum 3 clock and the swit ch. If the
Stratum 3 clock cannot be referenced and the loc al 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 b y one of the following cond itions:
■One or both TOCs (Timing Output Cards) has failed .
■The connection between the Stratum 3 cloc k 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 c an still provide timing to the
switch; otherwise, a Major alarm will b e raised because the Stratum 3
clock is not provid ing timing and the switc h is referencing the loc al
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 bec omes active and remains sync hronized to the Stratum 3 clock.
When the system switches to the Standby Tone-Clock circuit p ack, the
alarm is resolved, and a TDM-CLK alarm is raised to indicate a pos sible
problem on the TN780 Tone-Clock.
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 th ere 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 b y the enable
synchronization-switch command. The latter proced ure will cause
synchronization software to switch b ack to using the Stratum 3 cloc k
again. Wait 2 minutes and then execute the status synchronization
command. If Maintenance Na me 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 c ause slip alarms. The circuit packs that c an experience slip s and the associated error log entry for slips are as follows.