Nortel Networks 70 Series Appendix B Cables and Connectors, 10BASE-T/100BASE-TX UTP Cable, RJ-45

Appendix B

Cables and Connectors

This appendix provides specifications for cables and connectors used for the BayStack 70 Series 10/100 Ethernet Switch.

10BASE-T/100BASE-TX UTP Cable

For 10BASE-T and 100BASE-TX connections, use Category 5, 8-wire unshielded twisted pair cable. Configure your network according to the following guidelines:

•Use a maximum segment length of 100 meters.

•Use an 8-pin modular plug (RJ-45).

Table B-1 shows the RJ-45 connector pin assignments for MDI-X and MDI ports.

Table B-1.	RJ-45 Connector Pin Assignments
RJ-45		10BASE-T MDI-X	100 BASE-TX	MDI
10BASE-T/100BASE-TX Pin				(Uplink)
		(Normal) Port	MDI-X Port
Ethernet Port				Port

8

1

		1	RX+ (Receive)	RX+	TX+
	1	2	RX- (Receive)	RX-	TX-
		3	TX+ (Transmit)	TX+	RX+
	8	4	Not used	Common-Mode
				Terminated (CMT)
		5	Not used	CMT
1882.6
		6	TX- (Transmit)	TX-	RX-
		7	Not used	CMT
		8	Not used	CMT

206375-A B-1