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10
AT -AR048 LEDs
LED
Active
Loop
LOS
LOF
AIS
FERF
Base Unit LEDs related to NSMs
The following table may be helpful when diagnosing possible NSM faults. Switches
and routers with NSM bays have these LEDs built into their chassis.
LED
In Use (rear panel) Green
Swap (rear panel)
613-000610 Rev A
State
Function
Green
Lit when the Line Interface Unit (LIU) is receiving
a signal.
Green
Lit when any loopback is active.
Amber
Lit when the received signal is lost. This usually
indicates a network disruption, such as a cable
being disconnected or a device failure.
Amber
Lit when the DS3 framer cannot extract valid
frames from the received signal.
Amber
Lit when an Alarm Indication Signal is detected.
Amber
Lit when a Far End Receive Failure signal is
detected. This indicates the far end is receiving an
AIS, LOS, or LOF signal.
State
Off
Green
Off
Function
An NSM is installed, is receiving power, and is
operational. The NSM and its PICs are not ready
for hot swap.
No NSM is installed or the NSM is not installed
correctly (the switch or router has not
recognised the NSM).
The NSM and its PICs are ready to be hot
swapped.
The Hot Swap button must be pressed before the
NSM or its PICs can be hot swapped or the
software release does not support hot swapping.
Hot swapping is supported by Software Version
2.3.1 or later.
Network Service Module