Trouble Analysis Procedures - Fujitsu FLM 150 ADM Maintenance And Trouble Clearing

Maintenance and Trouble Clearing
FJTU-320-515-480
1.5

Trouble Analysis Procedures

1.5.1 General
When alarm indications are received, retrieve the alarms from the NEs using
FLEXR or TL1 messages. By using the retrieved condition type, resolve troubles
in the order of severity. Refer to Section 3, Responding to Alarms and Conditions,
for trouble-clearing information.
In regard to clearing troubles, the following assumptions are made:
• All FLM 150 ADM shelves in the network are properly equipped.
• Multiple trouble indications may have a single cause.
• Only one failure exists for the indication.
The local FLM 150 ADM displays the equipment number of any remote alarm
source on a 7-segment indicator on the front panel of the MP1A unit.
The local AW1A unit provides critical (CR), major (MJ), minor (MN), and
abnormal (ABN) alarm indications on the front panel for both the local and the
remote site.
Section 4 , in this practice, lists the precedures for replacing the plug-in units. If
the alarm does not clear after you install the replacement unit, return the
original plug-in unit to operation.
1.5.2 Alarm Message Flooding
In ring configurations, a serious event, such as a fiber cut, may flood the
autonomous message system with path-switch event reports, even though it does
not affect traffic. These messages are insignificant compared to the LOS alarm
that is also reported. With Release 10 and later system software, path-switch
event messages can be inhibited to prevent this flooding.
Issue 9, May 1999 FNC and FNC Customer Use Only
1.5: Trouble Analysis Procedures
Vol. ll, Page 480.1-16