Installation and Safety Guide 11
613-000610 Rev B
AT-AR048 LEDs
The following table describes LEDs on the AT-AR048 NSM.
Switch and Router LEDs
The following table describes LEDs on switches and routers that support NSMs.
LED State Function
Active Green Lit when the Line Interface Unit (LIU) is receiving
a signal.
Loop Green Lit when any loopback is active.
LOS Amber Lit when the received signal is lost. This usually
indicates a network disruption, such as a cable
being disconnected or a device failure.
LOF Amber Lit when the DS3 framer cannot extract valid
frames from the received signal.
AIS Amber Lit when an Alarm Indication Signal is detected.
FERF Amber Lit when a Far End Receive Failure signal is
detected. This indicates the far end is receiving an
AIS, LOS, or LOF signal.
LED State Function
In Use (rear panel) Green An NSM is installed, is receiving power, and is
operational. The NSM and its PICs are not ready
for hot swap.
Off No NSM is installed or the NSM is not installed
correctly. The switch or router has not
recognised the NSM.
Swap (rear panel) Green The NSM and its PICs are ready to be hot
swapped.
Off 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.
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