Allied Telesis Network Service Module AR040-48 - Manual (Page 9)

Quick Install Guide 9
C613-04019-01 REV J
AT-AR041 and AT-AR042.
AT-AR048
The AT-AR048 NSM has the following LEDs on its face-plate.
Table 2: AT-AR041 and AT-AR042 LEDs.
LED State Function
Active Green Lit when the BRI has successfully completed the
exchange of INFO 1 and INFO 2 signals, and
INFO 3 and INFO 4 signals are present on the
link. This means the ISDN interface is correctly
connected to a working NT device.
Off There is no connection to the ISDN, or the ISDN
has deactivated the connection.
Data Amber For on-demand ISDN, lit when there is a call up
over the respective B channel.
For permanent circuits, lit when HDLC packets
are being exchanged between the switch or
router and another TE end system device
(normally another switch or router) over the
respective B (data) channel.
Flashing Amber For on-demand ISDN, flashing when data is
being exchanged.
Off For on-demand ISDN, Off when there is no
active connection or when continuous data
exchange is occurring.
For permanent ISDN circuits, Off when no data
exchange is occurring.
Table 3: AT-AR048 LEDs.
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.