Constellation™ November 2003
10-4 Troubleshooting Guidelines
LED Indicators
The Keypad should be used to obtain a more detailed information on the
alarms.
Table 10-1:LED indicators
Module Label Color If the LED Is On
Fan Assembly FAULT Red
In a protected configuration, at least
one of the fans is not working.
Fuse Panel FUSE ALARM Red Indicates a fuse has blown.
High Level Mux
FAULT
ON-LINE
Red
Green
Board failure or input signal failure.
Carrying traffic.
M12 Unit
FAULT
ON-LINE
Red
Green
Board failure or output level is low.
Carrying traffic.
Modem
FAULT
ON-LINE
Red
Green
Indicates any of 4 Modem Tx alarms:
• Tx side 1 activity
• Tx side 2 activity
• Tx FIFO overflow
• Tx IF level alarm
or
Indicates any of 3 Modem Rx alarms:
• Carrier recovery
•R-S frame
• Rx FIFO overflow
Indicates that the Modem Tx, Modem Rx, or
both are on line. In a monitored hot standby,
both Modems can have the green LEDs on.
Selection is controlled by the SPU Controller.
Power Supply
FAULT
ON-LINE
Red
Green
Indicates an over-voltage alarm or that one or
more outputs have failed.
Converter is on and is operating (either
the Tx or the Rx is online.
Receiver
Assembly
FAULT
ON-LINE
Red
Green
Board failure or input signal failure.
Carrying traffic.
Service Channel
FAULT
ON-LINE
Red
Green
Indicates a board failure or inability to
synchronize with the far-end Service
Channel.
If power is on, this LED is always
lighted.
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