Chapter 2 Alarm
Sub-code Description
Each subcode represents a timeslot. The former 63 timeslots are used for optical port
1,and the latter 63 timeslots are used for optical port 2.
Effect on the System
The signal transmitted on the SDH link is interrupted.
Possible Causes
1.
The receive unit of upstream signal source equipment detects invalid signals. For
example, the signals contain the TU-AIS alarm.
2.
The signal sent from the upstream equipment to NR8250 equipment contains the
LP-RDI information.
3.
The RTUB board that reports the alarm is faulty.
Handling Procedure
1.
Check whether NR8250 upstream equipment reports alarms such as TU-AIS.
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If yes, handle the alarm by referring to the TU-AIS alarm of the NR8250
equipment.
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If no, go to step 2.
2.
Ensure that the signals sent by upstream equipment to NR8250 equipment do not
contain the TU-RDI signal.
3.
The alarm is caused by RTUB board failure. Replace the board.
2.2.12 134237745 MS-AIS
Alarm Property
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Alarm Code: 134237745
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Alarm Information: MS Alarm Indication Signal (MS-AIS) alarm. The alarm is reported
if K2[6-8] in more than three consecutive frames is 111.
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Alarm Level: Major
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Alarm Type: Communications Alarm
Sub-code Description
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Sub-code 1: Optical port 1 on the RTUB board;
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Sub-code 2: Optical port 2 on the RTUB board.
Effect on the System
The receive signal transmitted on the SDH link is interrupted.
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SJ-20111008094748-008|2012–05–30 (R1.1)
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