User's Manual

DEFINITY ECS Release 8.2 Maintenance for R8.2csi

555-233-119 Issue 1

April 2000

Maintenance Objects

3-566DS1-BD (DS1 Interface Circuit Pack)

When the Loss of Signal alarm is confirmed, the maintenance software places all

trunks or ports of the DS1 Interface circuit pack into the out-of-service state. The

inquiry test will run every 10 minutes until the loss of signal has been restored.

The DS1 Interface circuit pack raises a Loss of Signal alarm after the signal has

been lost for about 1second. It will not retire the alarm until the signal has

returned for about 10 seconds.

This test is also used to maintain the new 120A CSU Module and the 401A T1

Sync Splitter. The CSU Module, when combined with the functionality provided

by the TN767E circuit pack, provides functionality equivalent to an external

standalone ESF T1 CSU. The 401A T1 Sync Splitter, when combined with the

functionality provided by the TN767E circuit pack, allows an ATM switch to derive

its timing from a T1 connected to the DS1 in the DEFINITY.

If a TN767E circuit pack detects certain I-CSU/T1 Sync Splitter hardware errors, it

will notify maintenance. When the maintenance subsystem receives notification

of the error, it will execute this Loss of Signal Inquiry test. The test, in addition to

querying for a Loss Of Signal alarm condition, will also query the TN767E board

to confirm the error. A Minor or Warning alarm will be raised depending on the

severity of the error. The trunks on the board may be taken out of service if the

error is deemed serious.

If a Loss Of Signal alarm and an I-CSU/T1 Sync Splitter error co-exist, the Loss Of

Signal alarm condition will take priority and the board and all trunks on the board

will be put in the out-of-service state. Errors will be logged, however, for both.

When the maintenance subsystem receives notification that the ICSU/T1 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 errors or Loss Of Signal alarm exist).