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Chapter 5 Maintenance and Troubleshooting
Troubleshooting Alarm Conditions
Module Alarm Conditions
If the red ALARM indicator is illuminated or is blinking, check the display on the
front panel to determine the cause of the alarm.
Alarm
LasBias
LasTemp
ModTemp
InRF
OutPwr
98
Function
Laser Bias Current
Failed
Laser Temperature
High or Low
Module Temperature
High or Low
RF Input Power
High or Low
Optical Output Power
High or Low
Possible Causes
Automatic power control
circuit failure.
Laser temperature out of
specification. Laser could
be faulty.
Chassis air filter requires
changing.
Ambient temperature is too
high due to:
A failure in the building
air conditioning system.
Airflow through the rack
has been restricted or cut
off.
Prisma chassis cooling
fans are not operating
properly.
RF source not
transmitting.
Faulty RF cables or
connections.
Laser could be faulty.
Possible Solutions
Contact Cisco Services
for assistance.
Contact Cisco Services
for assistance.
Ensure the airflow
system has not been
damaged or removed.
Repair or replace fan
tray as needed.
To troubleshoot the
chassis cooling fans,
refer to Prisma II Chassis
Installation and
Operation Guide, part
number 713375.
Check RF source and
cables and call
connections.
Contact Cisco Services
for assistance.
78-4019959-01 Rev D
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Table of Contents
Troubleshooting
