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
Key:
A = Uplink or MDI port (as on a PC)
B = Normal or
The following diagram illustrates crossover twisted pair cable.
Key:
B = Normal or
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