Enterasys Networks XSR-3150 manual Balun for E1 or PRI NIM Cards

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 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).

J2 Receive BNC male connector

75-ohm connection to your network

Figure A-14 Balun for E1 or PRI Connection

		J12 Transmit BNC
		male connector
		75-ohm connection
		to your network
				RX
TX			In		NIM
				-
				E1
					-		G
Out				CO
						.
						Model
		AX			703
	BLN			B
	-			460
				alun
				MC				120-ohm

connection to XSR

XSR Getting Started Guide A-13