Switch User Manual

Cables

B-2

10BASE-T/100BASE-TX Pin Assignments

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

of wires. Each wire pair is identified by two different colors. For example, one wire

might be red and the other, red with white stripes. Also, an RJ-45 connector must be

attached to both ends of the cable.

With 100BASE-TX/10BASE-T cable, pins 1 and 2 are used for transmitting data, and

pins 3 and 6 for receiving data.

Because all ports on this switch support automatic MDI/MDI-X operation, 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. The table below shows the 10BASE-T/100BASE-TX MDI and MDI-X port

pinouts.

Note: Auto-negotiation must be enabled for automatic MDI/MDI-X pinout configuration.

RJ-45 Pin Assignments

Pin Number

Assignment

1Tx+

2Tx-

3Rx+

6Rx-

1: The “+” and “-” signs represent the polarity of the wires

that make up each wire pair.

Pin MDI-X Assignment MDI Assignment

1 Input Receive Data + Output Transmit Data +

2 Input Receive Data - Output Transmit Data -

3 Output Transmit Data + Input Receive Data +

6 Output Transmit Data - Input Receive Data -

No other pins are used.