Enterasys Networks XSR-3150 manual Port BRI-S/T Isdb NIM Card Ports

Cable, CompactFlash and Accessory Specifications

1/2-Port BRI-S/T ISDB NIM Card Ports

The XSR provides a serial NIM card for 1 or 2 WAN interfaces over an ISDN-S/T BRI line, as shown in Figure A-18. The Port 0 and 1 LEDs shine when the lines are active and ready to receive traffic. See Figure A-19for pinout assignments.

Figure A-18 ISDN BRI-S/T NIM Card (RJ-45 ports shown)

Port 0 Activation LED

Port 1 Activation LED

Figure A-19 ISDN BRI-S/T NIM Pinouts

	BRI-S/T		Pin	Signal
Pin 1		Pin 8	1	Unused
			2	Unused
			3	Transmit (+)
			4	Receive (+)
			5	Receive (-)
			6	Transmit (-)
			7	Unused
			8	Unused

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 -17 for directions.

Figure A-20below shows per port respective termination header locations and the orientation of the receive and transmit pairs.

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.

Refer to Chapter 2 for directions on accessing the BRI card on the XSR.

A-16