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10 Network Service Module
C613-03022-00 REV K
Basic Rate ISDN Interfaces
Each Basic Rate S/T interface supports two 64kbit/s B channels and one
16kbit/s D channel, and operates in TE mode only. The switch or router should
be configured as a TE for normal operation.
User-configurable jumpers provide 100Ω line termination. By default, the
jumpers are factory set to terminate Rx and Tx, bridging terminals 2 and 3
(Figure 5 on page 10). To remove the line termination, move the jumpers so that
they bridge terminals 1 and 2.
Figure 5: Location of jumpers on BRI NSMs
You should install the termination jumpers (terminate Rx and Tx) if:
■ termination is not provided by the building wiring, and
■ the device is the only TE device on a Point-to-Point link between the NT
and the TE, or the device is the last device on an S/T bus
You should remove the termination jumpers (not terminate Rx and Tx) if:
■ termination is provided by the building wiring, or
■ the device is one of a number of devices on an S/T bus, and is not the last
device on an S/T bus
3 2 1
3 2 1
RJ45 and LED blocks
Jumper set to Not Terminated
Jumper set to Terminated
(Factory default)
There are two jumpers per port. The AT-AR041 NSM,
therefore, has sixteen jumpers, while the AT-AR042 NSM has
eight jumpers. Each pair of jumpers set the Termination for the
port that they are closest to.