Specifications

Appendix B: Cables

NXA-ENET8POE Gigabit PoE Ethernet Switch

Appendix B: Cables

Twisted-Pair Cable and Pin Assignments

For 10BASE-T/100BASE-TX connections, a twisted-pair cable must have two pairs of wires. For

1000BASE-T connections the twisted-pair cable must have four pairs of wires. Each wire pair is identified by

two different colors. For example, one wire might be green and the other, green with white stripes. Also, an

RJ-45 connector must be attached to both ends of the cable.

10BASE-T/100BASE-TX Pin Assignments

Use unshielded twisted-pair (UTP) or shielded twisted-pair (STP) cable for RJ-45 connections: 100-ohm

Category 3 or better cable for 10 Mbps connections, or 100-ohm Category 5 or better cable for 100 Mbps

connections. Also be sure that the length of any twisted-pair connection does not exceed 100 meters (328 feet).

The RJ-45 ports on the NXA-ENET8POE support automatic MDI/MDI-X operation, so you can use straight-

through cables for all network connections to PCs or servers, or to other switches or hubs. In straight-through

cable, pins 1, 2, 3, and 6, at one end of the cable, are connected straight through to pins 1, 2, 3, and 6 at the

other end of the cable. When using any RJ-45 port on the device, you can use either straight-through or

crossover cable.

Each wire pair must be attached to the RJ-45 connectors in a specific orientation.

DO NOT plug a phone jack connector into any RJ-45 port. Use only twisted-pair

cables with RJ-45 connectors that conform with FCC standards.

FIG. 38 RJ-45 Connector Pin Numbers

10/100BASE-TX MDI-X and MDI Port Pinouts

Pin MDI Signal Name MDI-X Signal Name

1 Receive Data plus (RD+) and GND (Positive

Vport)

Transmit Data plus (TD+) and -48V feeding power

(Negative Vport)

2 Receive Data minus (RD-) and GND

(Positive Vport)

Transmit Data minus (TD-) and -48V feeding power

(Negative Vport)

3 Transmit Data plus (TD+) and -48V feeding

power (Negative Vport)

Receive Data plus (RD+) and GND (Positive Vport)

6 Transmit Data minus (TD-) and -48V feeding

power (Negative Vport)

Receive Data minus (RD-)

and GND (Positive Vport)

4, 5, 7, 8 Not used Not used