Enterasys-networks XSR-3150 Manual de usuario descargar pdf (Pagina 99)

Cable, CompactFlash and Accessory Specifications

XSR Getting Started Guide A-13

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 Figure A-14. The grounding shunt is also required to

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).

Figure A-14 Balun for E1 or PRI Connection

RX In TX Out

G.703 Balun

Model 460 MC

NIM-E1-CO

AX-BLN

J12 Transmit BNC

male connector

75-ohm connection

to your network

120-ohm

connection to XSR

J2 Receive BNC

male connector

75-ohm connection

to your network

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Enterasys-networks XSR-3150 Manual de usuario Pagina 99