Balun For E1 Or Pri Nim Cards - Enterasys X-Pedition XSR-3150 Getting Started Manual

Cable, CompactFlash and Accessory Specifications

Balun for E1 or PRI NIM Cards

Some overseas electrical systems require that you use a balun and grounding shunt when utilizing
an E1 or PRI NIM card on the XSR. A balun is an adapter employed to connect a 75-ohm coaxial
cable pair (2 BNC connectors) to a 120-ohm twisted pair cable (RJ-48C connector).
The balun and its connectors are shown in
insulate (ground) unused pins of the RJ-48C connector.
To install the balun, attach the 75-ohm coaxial cables to the BNC connectors and a 120-ohm E1/
PRI cable to the RJ-48C port (see below for details).
J2 Receive BNC
male connector
75-ohm connection
to your network
A-14
Figure
Figure A-14 Balun for E1 or PRI Connection
A-14. The grounding shunt is also required to
J12 Transmit BNC
male connector
75-ohm connection
to your network
120-ohm
connection to XSR