Enterasys Networks XSR-3150 - Manual (Page 102)

Cable, CompactFlash and Accessory Specifications
A-16
1/2-Port BRI-S/T ISDB NIM Card Ports
The XSR provides a serial NIM card for 1 or 2 WAN interfaces over an ISDN-S/T BRI line, as
shown in
Figure A-18 . The Port 0 and 1 LEDs shine when the lines are active and ready to receive
traffic. See Figure A-19 for pinout assignments.
Figure A-18 ISDN BRI-S/T NIM Card (RJ-45 ports shown)
Figure A-19 ISDN BRI-S/T NIM Pinouts
Termination Shunt for the ISDN BRI-S/T NIM Card
ISDN BRI-S/T terminal equipment devices may be connected at random points of the cable in
point-to-point or point-to-multipoint configurations. Line termination resistors must be provided
at both ends of the transmit/receive lines only.
The XSR’s BRI NIM card provides an option to terminate receive as well as transmit lines using
100 Ohm resistors. Shunts are required to shorten the appropriate contacts of the terminal headers
(P1, P2). Refer to “Installing Shunt/Terminal Strip” on page -17 for directions.
Figure A-20 below shows per port respective termination header locations and the orientation of
the receive and transmit pairs.
Refer to Chapter 2 for directions on accessing the BRI card on the XSR.
Port 0 Activation LED Port 1 Activation LED
Pin Signal
1 Unused
2 Unused
3 Transmit (+)
4 Receive (+)
5 Receive (-)
6 Transmit (-)
7 Unused
8 Unused
BRI-S/T
Pin 8 Pin 1
Caution: The cable connecting the BRI NIM to the balun requires two additional wires to extend
the chassis ground to the balun. Cables of this type are often provided by your supplier who can
customize them for your needs.