Avaya S8700 Maintenance Manual page 548

Maintenance Object Repair Procedure
If a UDS1 circuit pack detects certain I-CSU hardware errors, it notifies
maintenance. When the maintenance subsystem receives notification of the
I-CSU error, it executes this Loss of Signal Alarm Inquiry test (#138). The test, in
addition to querying for a Loss of Signal alarm condition, also queries the UDS1
board to confirm the I-CSU error. A Minor or Warning alarm is raised depending
on the severity of the I-CSU error. The trunks on the board may be taken out of
service if the I-CSU error is deemed serious.
If a Loss Of Signal alarm and an I-CSU error co-exist, the Loss Of Signal alarm
condition takes priority, and the board and all of its trunks are put in the
out-of-service state. However, errors are logged for both.
When the maintenance subsystem receives notification that the I-CSU hardware
error condition no longer exists, maintenance will restore the board and its trunks
to their previous service state, if the alarm can be cleared (no other I-CSU errors
or Loss Of Signal alarms exist).
Echo Cancellation
If the TN464GP/TN2464BP or later suffix UDS1 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 ICSU errors,
also queries the TN464GP/TN2464BP to confirm the echo canceller error. A
minor alarm is raised if the error is confirmed. The board's trunks remain
in-service since the board is still functional except for its echo-cancellation
capability.
If a loss-of-signal condition co-exists with ICSU and/or echo-canceller errors, the
loss of signal condition takes priority, and the board and every trunk on the board
is 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's error condition no longer exists, the maintenance subsystem restores
the board and its trunks to their previous service state, if the alarm can be cleared
(no other ICSU errors or loss-of-signal conditions exist).
8-1244 Issue 1 May 2002 555-233-142