Specifications

4000326 Rev A Optical Switches 3-33
Troubleshoot Alarm Conditions
Introduction
The following troubleshooting information helps identify possible causes and
solutions to switch alarm conditions.
Troubleshooting Alarms
If the red Alarm indicator is illuminated or blinking, check the ICIM display or the
appropriate LCI screen to determine the cause of the alarm.
Refer to the following table for troubleshooting assistance.
Alarm Meaning Possible Causes Possible Solutions
PInLoss3
Loss of light at
input 3
Input 3 dark.
• Check both optical sources.
• Check optical connections.
PInLoss4
Loss of light at
input 4
Input 4 dark.
• Check both optical source.
• Check optical connections.
Ambient temperature is
too high due to:
• Air conditioner
malfunction.
Diagnose the problem and repair
or replace as needed.
• Airflow through the
rack restricted or cut
off.
Ensure the airflow system has not
been damaged or removed.
Repair or replace as needed.
TempAlm
Module
temperature is
above or below
the threshold
• Fan tray cooling fans
are not operating
properly.
Troubleshoot the fans.
For help, telephone the Scientific-
Atlanta assistance center in your
area.
BothDark
Loss of light at
both inputs
Inputs 3 and 4 are dark.
• Check both optical sources.
• Check optical connections.
NoSwitch
Failure of
switch
• Switch not seated
properly.
• Switch failure.
Check module seating.
For help, telephone the Scientific-
Atlanta assistance center in your
area.
PsOk
Status of
voltage rails
Power supply OK. No action required.