Cable and pin assignment, 10base-t/100base-tx pin assignments, 10base-t/100base-tx – NetComm NCT240 User Manual

Page 28: Ssignments

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NetComm NCT240 Installation Guide Release 1.0

6. Cable and Pin Assignment

Following illustrates how the pins on the RJ-45 connector are numbered. Be sure to hold the

connectors in the same orientation when attaching the wires to the pins.

Figure 5-1. Connecting to the Punch-down Blocks

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.

Pin Number


1 Tx+

2 Tx-

3 Rx+

6 Rx-

Because the ports on the NCT240 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 pin outs.