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TDM-CLK (TDM Bus Clock)
Issue 4 May 2002 10-1725 555-233-123
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.
2. Otherwise, enter the display errors command, and follow corrective
procedures for any other TDM-CLK, TONE-BD, SYNC, DS1C-BD,
EXP-INTF, SNC-BD, and SNI-BD errors logged, except for those in
the following table.
3. If 1025 errors persist, refer to SYNC Maintenance in this manual
and follow the procedures in the “Approach to Troubleshooting”
section.
h. Error Type 1281

This error is an indication that the Tone-Clock circuit
pack has detected a loss of timing signal from the system synchronization
reference. The Tone-Clock circuit pack has switched synchronization
references.
1. Resolve any errors logged against the SYNC or STRAT-13
maintenance objects.
2. Refer to SYNC maintenance, in the “Approach to Troubleshooting”
section, if the error is not resolved by step 1
Error Type 1282

Indicates that the TN2182 tone-clock was synchronized
to a DS1 facility and that the reference frequency provided by the DS1
drifted beyond a range that could be tracked by the TN2182. Therefore the
TN2182 is no longer synchronized to that DS1 reference. If a second DS1
is available, the tone-clock may be synchronized to that reference. If no
secondary DS1 reference is available, the tone-clock will run off of its
internal clock. This may result in slips being reported by the tone-clock and
all DS1 facilities.
Error Log Entries for Slip Errors
Circuit Pack Name
Error Log
Name Error Log Entry for Slips
DS1 Interface DS1-BD 3073 to 3160
Expansion Interface EXP-INTF 2305
Switch Node Interface SNI-BD 1537
Tone-Clock TDM-CLK 1025
UDS1 Interface UDS1-BD 3073 to 3160
DS1C Circuit Pack DS1C-BD 3329