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Hardware Reference 9
C613-03022-00 REV K
AT-AR041 and AT-AR042 NSMs
The AT-AR041 NSM provides eight ISDN Basic Rate S/T interfaces. The front
panel of the AT-AR041 is shown in Figure 3.
Figure 3: AT-AR041 NSM
The AT-AR042 NSM provides four ISDN Basic Rate S/T interfaces. The front
panel of the AT-AR042 is shown in Figure 4.
Figure 4: AT-AR042 NSM
The BRI ports use RJ-45 connectors and provide TE interfaces. There are two
status LEDs per port. The functions of the LEDs are listed in Table 2.
The AT-AR041 and AT-AR042 support point-to-point links. Point to multi-
point links are not supported.
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.
6754 2310
Data
Active
2310
Data
Active