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NetComm NCT240 Installation Guide
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.
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.
Pin Number
1
2
3
6
Assignment
Tx+
Tx-
Rx+
Rx-
Release 1.0
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