Specifications

Hardware Reference 41
C613-03020-00 REV K
PIC LEDs
PICs are expansion options and must be purchased separately. They can only
be used if an AT-AR040 NSM is installed in the switch. NSMs (and therefore
PICs) can be used with all Rapier models except the Rapier 48, Rapier 48i, G6,
G6F/SX, G6F/LX, and G6F/MT.
These LEDs are located on the face-plate of the respective PIC.
Table 24: LEDs on the AT-AR020 PRI E1/T1 PIC
LED Function
D Data [ISDN mode only] Lit when HDLC packets are being exchanged between
the switch and the ISDN switch over the D (signalling) channel.
B Data Lit when HDLC packets are being exchanged between the switch 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) frames are being received
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.
Table 25: LEDs on the AT-AR021(S) BRI-S/T PIC
LED Function
B1, B2 For on-demand ISDN, lit when there is a call up over the respective B
channel and flashing when data is being exchanged.
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.
Active 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 that the ISDN interface is correctly connected to a working
NT device.
D Lit when HDLC packets are being exchanged between the switch and
the ISDN switch over the D (signalling) channel.
Table 26: PIC LEDS on the AT-AR021(U) BRI-U PIC
LED Function
B1, B2 Lit when HDLC packets are being exchanged between the switch and
another TE end system device (normally another switch or router) over
the respective B (data) channel.
For ISDN, lit when there is a call up over the respective B channel and
flashing when data is being exchanged.
Active Lit when the U interface is in the Activated state (i.e., it is fully
operational at layer 1).
D Lit when HDLC packets are being exchanged between the switch and
the ISDN switch over the D (signalling) channel.