Instruction Manual

Alarm Descriptions
8 (14) © Nokia Corporation DN00283923
Nokia Proprietary and Confidential Issue 2 DRAFT 1 - en
Table 1. Switch Matrix Unit Alarms
2.2.2 Control Unit alarms
Table 2. Control Unit alarms
2.2.3 Local Unit alarm
Alarm Description
Alarm
Status
Auto
Recovery
Action
CU AL CU alarm for Self Test
Failure: one or more units
in the system do not
respond to CU queries.
Red led is ON.
Major Yes Remove the faulty unit(s)
and insert known good
units; check that the
system functions correctly.
BkUp PSU or External
Temperature alarm: an
alarms backup has been
performed and stored in
the CU to avoid the loss of
data if the system power
supply drops. Red led is
ON.
Major Yes See PSU alarms
description
System Al All alarms; red led is ON
and alarm is either major or
minor.
- - See Figure Alarm
Alarm Description
Alarm
Status
Auto
Recovery
Action
UPLINK Alarms
Tone_L UL Tone transmitted by RU
below the threshold (Low).
Minor Yes Clean UL Fiber Optical
cable or replace if if it is
damaged or stretched.
Tone_F UL Tone transmitted by RU
absent (Fail)
Major Yes RU laser broken,
switched off or fibre optic
cable broken; check RU
or fibre optic cable.
General Alarms