DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-1542STRAT-3 (Stratum 3 Clock)
9
If the alarm is major:
Check connections b etween the Stratum 3 clock and the switc h. If
there are no loose connections, then, using the
Stratum 3 Wiring Guide
, check that the wiring installation is correct. After
reconnecting the loose c onnection or correctly rewiring i t, clear the
alarm by first issuing the disable synchronization-switch
command followed b y 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 b ecame active:
Check the connection b etween the Stratum 3 clock and the TN780
Tone-Clock circuit pack from whic h the system has just switched. If
there are no loose connections, then, replac e the TN780
Tone-Clock circuit pack. Refer to the ‘‘How to Replace the
Tone-Clock circuit pack’’ sect ion in the TDM-CLK (TDM Bus Clock)
Maintenance documentatio n. Before switching back to the new
TN780 Tone-Clock circuit pack, use the test tone-clock UC long
command to chec k that the Tone-Clock is receiving a signal from
the Stratum 3 clock. If all tests pass, swi tch to the new Tone-Clock
circuit pack vi a the set tone-clock UC override command. If Test
#651 fails, then the original TN780 Tone-Clock should be
reinserted, and the cab le between the Stratum 3 clock and the
TN780 Tone-Clock circuit pack should b e replaced. If Test #651
continues to fail, then escalate the p roblem.
For all of the above cases if slip alarms exist after following the repair
procedures, clear the slip alarms by running the test board command
with the clear option. See the table on the previous page for a list of circuit
packs and assoc iated slip error log entries.
Table 9-587. 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