TDM-CLK (TDM Bus Clock)
Issue 1 May 2002
8-1125555-233-142
d. The IPSI’s Tone-Clock circuit may be defective, however it may be a
software failure that can be corrected by testing.
1. Check to see if the board is duplicated (list cabinet and status
port-network) on the affected port network.
2. Use test tone UUCSS long to resolve the errors. The long test
resets the board and is required to reload on-board RAM associated
with the TN2182’s DSPs. The effect is that tone detectors are taken
out of service momentarily and tones are removed from the TDM
bus for about 10 seconds, meaning that no dial tone or touch tones
are available during this interval. This will probably not affect calls in
progress, but could cause a call origination to abort or a user not to
get dial tone when going off hook.
3. If every test passes and the alarm does not resolve, retest with test
tone UUCSS long clear.
4. If the test passes, terminate the repair process. If the test fails,
replace the circuit pack at the customer’s convenience.
5. If this error was logged against the standby Tone-Clock, and if the
Aux Data value was 18369, SYNC (Synchronization) maintenance
acts on this error. No corrective action is required. For any other
Aux Data, go to the next step.
6. If the board is duplicated, switch to the standby side (set tone).
7. Test the alarmed board (test tone UUCSS long). This resets the
board and is required to reload on-board RAM associated with the
TN2182’s DSPs.
8. If every test passes and the alarm does not resolve, retest (test
tone UUCSS long clear).
9. If the test passes, terminate the repair process. If the test fails,
replace the circuit pack at the customer’s convenience.
e. 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 following procedure.
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.
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