DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-582DS1-BD (DS1 Interface Circuit Pack)
9
circuit pack detects a Loss of Signal alarm, it stops providing the synchronization
clock for the system if it is administered as a timing source and transmits a Y ellow
alarm to the remote DS1 endpoint.
When the Loss of Signal alarm is confirmed, the mainten ance software places all
trunks or ports of the DS1 Interface ci rcuit pack into the out-of-servic e state. The
inquiry test will run every 10 minutes unt il 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 second s.
This test is also used to maintain the new 120A CSU Module. This Module, when
combined with the func tionality provided b y the TN767E circuit pack, p rovides
functionality equivalent to an exter nal standalone ESF T1 CSU.
If a TN767E circuit pack detec ts certain ICSU hardware errors, it will notify
maintenance. When the maintenance subsyste m receives notification of the
I-CSU error, it will execute this Loss of Signal Inquiry test. The test, in add ition to
querying for a Loss Of Signal alar m condition, will also quer y the TN767E board
to confirm the I-CSU error. A Minor or Warning alarm will be raised depending on
the severity of the ICSU error. The trunks on the board may be taken out of
service if the ICSU error is deemed serious.
If a Loss Of Signal alarm and an ICSU error co-exist, the Loss Of Signal alarm
condition will take priority and the board and all trunks on th e board will be put in
the out-of-service state. Errors will be logg ed, however, for both.
When the maintenance subsystem receives notifi cation that the ICSU hardware
error condition no longer exists , maintenance will restore the board and all trunks
to their previous service state if the alar m can be cleared (no other ICSU errors or
Loss Of Signal alarm exist)
Table 9-237. TEST #138 Loss of Signal Alarm Inquiry Test
Error
Code Test
Result Description/ Recommendation
ABORT Internal system error
2100 ABORT Could not allocate the necessary system resources to run this test.
1. Retry the command at 1-minute intervals a maximum of 5 times.
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