Hardware Reference
21
C613-03022-00 REV F
Switch and router LEDs related to NSMs
Switches and routers with NSM bays have the following LEDs built into their
chassis.
1. Hot swapping is supported by software release 2.3.1 or later.
PIC LEDs
The following tables may be helpful when diagnosing possible AT-AR040 NSM
operational faults. These LEDs are located on the face-plate of the respective
PIC. PICs are expansion options and must be purchased separately.
.
Table 5: Base-unit NSM LEDs (rear panel).
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
1
Table 6: PIC LEDs (AT-AR020 PRI E1/T1).
LED
Function
D Data
[ISDN mode only] Lit when HDLC packets are being exchanged between
the switch or router and the ISDN switch over the D (signalling) channel
B Data
Lit when HDLC packets are being exchanged between the switch or
router and another end system device (normally another switch or router)
over any of the B (data) channels
Active
Lit whenever operational (i.e., no RAI or AIS set) frames are being
received on the respective interface (PRI 0 or PRI 1) from another source
NT
[ISDN mode only] Lit when the PRI1 is operating in NT mode. This LED
should not be lit during normal operation
