Maintenance-Object Repair Procedures
555-233-143
8-1502 Issue 1 May 2002
If the alarm is major:
Check connections between the Stratum-3 clock and the switch. If
there are no loose connections, then, using the Stratum-3 Wiring
Guide, check that the wiring installation is correct. After
reconnecting the loose connection or correctly rewiring it, clear the
alarm by first issuing the disable synchronization-switch
command followed by the enable synchronization-switch
command. Wait 1-minute, and then execute the status
synchronization command. If Maintenance Name on the status
screen shows ‘‘STRAT-3,’’ then the problem is resolved.
If the Standby Tone-Clock circuit pack became active:
Check the connection between the Stratum-3 clock and the TN780
Tone-Clock circuit pack from which the system has just switched. If
there are no loose connections, then, replace the circuit pack
containing the TN780 Tone-Clock circuit pack. See ‘‘Replacing the
IPSI or Tone-Clock Circuit Pack’’. Before switching back to the new
TN780 Tone-Clock circuit pack, use the test tone-clock UC long
command to check that the Tone-Clock is receiving a signal from the
Stratum-3 clock. If every test passes, switch to the new Tone-Clock
circuit pack via the set tone-clock UC override command. If Test
#651 fails, then the original TN780 Tone-Clock circuit pack should
be reinserted, and the cable between the Stratum-3 clock and the
TN780 Tone-Clock circuit pack should be replaced. If Test #651
continues to fail, then escalate the problem.
If slip alarms exist after following the repair procedures for any of the
previous cases, clear the slip alarms by running the test board command
with the clear option. See Table 8-587, ‘‘Timing Slip Error Types’’ for a list
of circuit packs and associated slip error log entries.
This error indicates that the Tone-Clock circuit pack in the master port
network is not a TN780. If duplicate Tone-Clock circuit packs exist in the
master port network, this error may mean that one or both Tone-Clock
circuit packs are not TN780s. Verify that the Tone-Clock(s) in the master
port network are TN780s.
Table 8-587. Timing Slip Error Types
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
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