Termination Shunt For The Isdn Bri-S/T Nim Card; Installing Shunt/Terminal Strip - Enterasys X-Pedition XSR-1805 Getting Started Manual

Cable, CompactFlash and Accessory Specifications

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 ‐16 for directions.
Figure
receive and transmit pairs.
Refer to Chapter 2 for directions on accessing the BRI card on the XSR.

Installing Shunt/Terminal Strip

To install the shunt or terminal strip, attach two dual‐pin units vertically to P1 and P2 four‐pin
jumpers corresponding to the RJ‐45 port using a balun, as shown in Figure
ports on the NIM card connected to 120‐ohm lines do not require shunts.
A-16
A‐20 shows per port respective termination header locations and the orientation of the
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.
Figure A-20 Installing a Termination Shunt on ISDN BRI-S/T NIM Card
T1
P 1
F1 F2 F3 F4
J1
Port 0
R eceive P air Term ination
T2
P 2
F5 F6 F7 F8
J2
P ort 1
A‐20. Any other RJ‐45
Transm it Pair Term ination