Allied Telesis AT-AR048-B User Manual
Page 12
Installation and Safety Guide
11
613-000610 Rev C
AT-AR048 and AT-AR048-B LEDs
The following table describes LEDs on the AT-AR048 and AT-AR048-B NSMs.
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
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
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.