Model EN308
TC
Ethernet Hub Installation Guide
Twisted Pair Cables
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. Most ports on
switches and repeaters have media dependent interfaces with crossover ports.
These ports are referred to as MDI-X or Normal ports. Computer and
workstation adapter cards are usually media-dependent interface ports referred
to as MDI or Uplink ports. The figures above illustrate the use of straight-
through and crossover twisted pair cables.
Straight-through
twisted pair cable
Crossover
twisted pair cable
8146EC
Tx
Uplink or
MDI port
Normal or
MDI-X port
Normal or
MDI-X port
Normal or
MDI-X port
Rx
1
2
3
6
Tx
Rx
1
2
3
6
1
2
3
6
1
2
3
6
Tx
Rx
Tx
Rx
Twisted Pair Cables
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