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DEFINITY Enterprise Communications Server Release 6
Maintenance for R6vs/si
555-230-127
Issue 1
August 1997
Maintenance Object Repair Procedures
Page 10-1336TDM-CLK (TDM Bus Clock)
10
d. The Tone-Clock circuit pack in the PPN is not a TN780 while a Stratum 3
synchronization is administered. Replace the Tone-Clock in the PPN with a
TN780, or change synchronization administration to Stratum 4 if a Stratum
3 clock is not being used.
e. The tone-clock has reported an out-of-lock condition. A aux value of 1
indicates this error is an out-of-lock with the primary reference. A aux
value of 2 indicates this error is an out-of-lock with the secondary
reference. It could not lock onto the frequency of that synchronization
reference. This will lead to a change in the synchronization reference if the
condition continues.
f. The Tone-Clock circuit pack may be defective.
1. If this error was logged against an Active Tone-Clock circuit
pack, then test that circuit pack via the test tone-clock UUC. If
there are error codes from any tests, follow the recommended
maintenance procedures for the error code(s) to resolve the
problem(s). If all tests pass, consider the 769 error type to have
been a transient problem, and clear the error log entry with test
tone-clock UUC long clear.
2. If this error was logged against the Standby Tone-Clock circuit
pack, and if the Aux Data value was 18369, Synchronization
maintenance acts on this error. No corrective action is required. For
all the other Aux Data values, replace the Standby Tone-Clock
circuit pack. Refer to the TONE-BD section on ‘‘How to Replace the
Tone-Clock Circuit Pack’’.
g. Tone-Clock circuit pack on-board maintenance has detected one or more
clock slips
, timing differences between its internal reference source and
the synchronization signal provided by the master Tone-Clock. Although
no clock slip errors are expected during normal operation, both manual
and automatic interchanges of Tone-Clock circuit packs, synchronization
references, and PNCs, may result in clock slip counts.
If error 1281 also is logged for the same Tone-Clock circuit pack, it is
related to this problem, and should be corrected first. Otherwise, continue
with the procedure below.
1. Use test tone-clock UUC, and examine the results of test #149 to
see if slip errors are still occurring. If no new slip errors are
reported, and if these errors are not causing a TDM-CLK alarm,
they may be ignored. Use test tone-clock UUC long clear to clear
the errors.