Allied Telesis AT-AR048-B - Manual (Page 11)

10 Network Service Module
613-000610 Rev C
LEDs and What They Mean
The following LEDs report operations and faults on NSMs:
■ “AT-AR041 and AT-AR042 LEDs” on page 10
■ “AT-AR048 and AT-AR048-B LEDs” on page 11
■ “Switch and Router LEDs” on page 11
The AT-AR040 and AT-AR040-B NSM units do not have independent LEDs. See
“Switch and Router LEDs” on page 11 for information about related LEDs found on
the base switch or router.
PIC LED descriptions can be found in the Port Interface Card Hardware Reference,
which can be downloaded from
www.alliedtelesis.com/support/software .
AT-AR041 and AT-AR042 LEDs
The following table describes LEDs on the AT-AR041 and AT-AR042 NSMs.
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 (data) 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 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.