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MG-DS1 (DS1 Interface Media Module)
Issue 1 June 2005 1607
Echo Cancellation
If the MM710 firmware detects a serious echo canceller hardware error, it notifies maintenance
software. When the maintenance subsystem receives notification of the echo cancellation error,
it executes this Loss Of Signal Alarm Inquiry test.
This test, in addition to querying for a loss of signal condition and CSU errors, also queries
MM710 to confirm the echo canceller error. A minor alarm is raised if the error is confirmed. The
trunks of the board remain in-service since the board is still functional except for the echo
cancellation capability.
If a loss of signal condition coexists with CSU and/or echo canceller errors, the loss of signal
condition takes priority, and the board and all trunks on the board are put in the out-of-service
state. Errors are logged, however, for each error type.
When the maintenance subsystem receives notification that the echo canceller hardware error
condition no longer exists, the maintenance subsystem restores the board and all trunks to their
previous service state, if the alarm can be cleared (no other CSU errors or loss of signal
conditions exist).
Note:
Note: The DSU functionality is not available in this release of Communication Manager.
Table 592: TEST #138 Loss of Signal Alarm Inquiry Test
Error
Code
Test
Result
Description/ Recommendation
ABRT Internal system error
1. Retry the command at 1-minute intervals for a maximum of 5 times.
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