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Twisted Pair Cables
For two devices to communicate, the transmitter of each device must be connected to the
receiver of the other device. The crossover function is usually implemented internally as part of
the circuitry in the device. Computers and workstation adapter cards are usually media-
dependent interface ports, called MDI or uplink ports. Most repeaters and switch ports are
configured as media-dependent interfaces with built-in crossover ports, called MDI-X or normal
ports.
Key:
A = Uplink or MDI port (as on a PC)
B = Normal or MDI-X port (as on a hub or switch)
1, 2, 3, 6 = Pin numbers
The following diagram illustrates crossover twisted pair cable.
Key:
B = Normal or MDI-X port (as on a hub or switch)
1, 2, 3, 6 = Pin numbers
Rev.1 - YML624
24-port 10/100Mbps Auto-negotiation Fast Ethernet ProSwitch
www.netcomm.com.au
Page 15
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