Demand test descriptions and error codes - Avaya Support

Loss of Signal Alarm Inquiry Test (#138)
Loss of Signal Alarm Inquiry Test (#138)
Note:
Note: The term "board" refers to the DS1 Interface circuit packs, UDS1 Interface circuit
packs, and DS1 Interface Media Modules.
The Loss of Signal Alarm Inquiry Test verifies the synchronization status, echo cancellation, and
continuity of the DS1 link.
A Loss of Signal Alarm indicates that the board is unable to derive the synchronization clock
from the DS1 facility. If the board is administered as a timing source and it detects a Loss of
Signal alarm, the board 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 board is put into the
out-of-service state. The inquiry test will run every 10 minutes until the loss of signal has been
restored.
This test is run on the following maintenance objects:
● DS1-BD (DS1 Interface Circuit Pack)
● MAPD-BD (MAPD Interface Circuit Pack)
● MG-DS1 (DS1 Interface Media Module)
● UDS1-BD (UDS1 Interface Circuit Pack)
120A CSU Module/Sync Splitter
This test also maintains the 120A 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
ESF T1 CSU. The combination of the UDS1 and 120A 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 S8700 Fiber-PNC system.
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 S8700 Fiber-PNC system.
If a UDS1 circuit pack detects certain I-CSU/Sync Splitter hardware errors, it notifies the system.
When the system receives notification of the I-CSU/Sync Splitter error, it executes the Loss of
Signal Alarm Inquiry test (#138). The test queries for a Loss of Signal alarm condition, and
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.
Issue 5 May 2009 1237