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STRAT-3 (Stratum-3 Clock)
Issue 1 June 2005 2137
1 FAIL Either Reference A failed or CI card A failed. This condition usually
indicates a failure of the DS1 reference; however, there may also be a
failure of the CI card to which the reference is connected. The system
technician dispatched to investigate this problem should take a spare CI
card in case the CI card caused the failure.
If you are NOT ON-SITE, use the following procedure:
1. Use display errors to look for DS1-BD (DS1 Interface Circuit
Pack) errors. See the DS1-BD Maintenance documentation for
recommended strategy to resolve any DS1-BD errors found.
2. If there are no DS1-BD errors or after resolving every DS1-BD error,
use test synchronization r 4 to see if the alarm still exists. If
every test repetition passes, then the alarm no longer exists.
Otherwise, the system technician should be dispatched with a spare CI
card to use the following instructions on-site.
If you are ON-SITE, use the following procedure:
1. Look for a red LED on CI card A (i.e., the left CI card). If there is a red
LED, then replace the CI card, if a spare is available. If no spare CI is
available on-site, proceed to Step 3. If after replacing the CI card, the
red LED on the new CI card lights also, then proceed to Step 3.
2. If a spare CI card is available, replace the suspect CI card. Otherwise,
use test synchronization r 4 to clear the alarm. If any test
repetitions fail, then follow the procedure for those failures.
3. Use display errors to look for DS1-BD (DS1 Interface Circuit
Pack) errors. See the DS1-BD Maintenance documentation for
recommended strategy to resolve any DS1-BD errors found. If there
are no DS1-BD errors, then proceed to Step 5.
4. After every DS1-BD error has been resolved, use test
synchronization r 4 to clear the alarm and see if the alarm still
exists. If any test repetitions fail, follow the procedures for those
failures.
5. Check the DS1 reference A connections to the Stratum-3 clock.
6. To determine whether the alarm still exists, execute the test
synchronization r 4 command to clear the alarm. If any test
repetitions fail, then follow the procedures for those failures.
Table 766: TEST #161 Loop-Around Test (continued)
Error
Code
Test
Result
Description / Recommendation
2 of 5