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UDS1-BD (UDS1 Interface Circuit Pack)
Issue 1 June 2005 2407
Loss of Signal Alarm Inquiry Test (#138)
This test verifies the synchronization status, echo cancellation, and continuity of the DS1 link.
The Loss of Signal alarm indicates that the UDS1 Interface circuit pack is unable to derive the
synchronization clock from the DS1 facility. If the UDS1 Interface circuit pack is administered as
a timing source and it detects a Loss of Signal alarm, the circuit pack will stop providing the
synchronization clock for the system and will transmit a Yellow alarm to the remote DS1
endpoint.
When the Loss of Signal alarm is confirmed, every trunk or port of the UDS1 Interface circuit
pack is put into the out-of-service state. The inquiry test will run every 10 minutes until the loss
of signal has been restored.
The UDS1 Interface circuit pack raises a Loss of Signal alarm after the signal has been lost for
about 1 second. It will not retire the alarm until the signal has returned for about 10 seconds.
0NO
BOARD
The test could not relate the internal ID to the port (no board). This could
be due to incorrect translations, no board is inserted, an incorrect board is
inserted, or an insane board is inserted.
1. Verify that the board’s translations are correct. Execute add ds1
location to administer the UDS1 interface if it is not already
administered.
2. If the board was already administered correctly, check the error log to
determine whether the board is hyperactive. If this is the case, the
board is shut down. Reseating the board will re-initialize it.
3. If the board was found to be correctly inserted in step 1, enter
busyout board location
4. Enter reset board location.
5. Enter release board location.
6. Enter test board location long.
This should re-establish the linkage between the internal ID and the port.
Table 857: Test #135 Internal Loop-Around Test (continued)
Error
Code
Test
Result
Description / Recommendation
4 of 4