Cable, CompactFlash and Accessory Specifications
Grounding Shunt for E1 NIM Cards
If you connect a balun to a 75-ohm line, you will also need to attach a grounding shunt (or terminal strip) to any NIM pins whose RJ-48C connectors utilize the balun. The XSR requires that you use a shunt (shown in Figure A-15), or terminal strip to ground pins 3 and 6 of the RJ-48C interface, which are not needed to complete the connection.
Figure A-15 Sample Grounding Shunt
Caution: The cable connecting the E1/PRI NIM to the balun requires two more wires to extend the chassis ground to the balun. Cables of this type are often provided by your supplier who can customize them to your needs.
Refer to “Hardware Installation” on page 2-1 for directions on accessing the E1 card on the XSR.
Installing Shunt/Terminal Strip
To install the shunt or terminal strip, attach two dual-pin units vertically to each four-pin jumper (P2, P3, P4, or P5) corresponding to the RJ-48C port using a balun, as shown in Figure A-16. Any other RJ-48C ports on the NIM card connected to 120-ohm lines do not require shunts.
Figure A-16 Installing a Grounding Shunt on the E1 NIM Card
