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Maintenance Object Repair Procedures
555-233-123 10-1864 Issue 4 May 2002
120A1 CSU Module/Sync Splitter
This test is also used to maintain the Avaya 120A1 CSU Module or the 401A T1
Sync Splitter, and the 402A or 403A E1 Synchronization Splitter. The CSU
Module, when combined with the functionality provided by the UDS1 circuit pack,
provides functionality equivalent to an external stand-alone Avaya ESF T1 CSU.
The combination of the UDS1 and 120A1 CSU Module is known as an Enhanced
Integrated CSU (I-CSU).
The 401A T1 Synchronization Splitter, when combined with the functionality
provided by the UDS1 circuit pack, allows an ATM switch to derive its timing from
a T1 connected to the UDS1 in the DEFINITY.
The 402A or 403A E1 Synchronization Splitter, when combined with the
functionality provided by the UDS1 circuit pack, allows an ATM switch to derive its
timing from an E1 connected to the UDS1 in the DEFINITY.
If a UDS1 circuit pack detects certain I-CSU/Sync Splitter hardware errors, it
notifies maintenance. When the maintenance subsystem receives notification of
the I-CSU/Sync Splitter 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/Sync Splitter error. A Minor or
Warning alarm is raised depending on the severity of the I-CSU/Sync Splitter
error. The trunks on the board may be taken out of service if the I-CSU/Sync
Splitter error is deemed serious.
If a Loss Of Signal alarm and an I-CSU/Sync Splitter error co-exist, the Loss Of
Signal alarm 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 both.
When the maintenance subsystem receives notification that the I-CSU/Sync
Splitter hardware error condition no longer exists, maintenance will restore the
board and all trunks to their previous service state, if the alarm can be cleared (no
other I-CSU/Sync Splitter errors or Loss Of Signal alarm 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 trunks of the board remain
in-service since the board is still functional except for the echo cancellation
capability.