Constellation™ 2002 June 20
11-4
Table 11-1: 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.
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