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Technical Specifications
Cable and Connector Information
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 illustrate the use of straight-through and crossover twisted pair
cables.
Uplink or
MDI port
1
Tx
2
3
Rx
6
Normal or
MDI-X port
1
Rx
2
3
Tx
6
TP
Model EN104
/EN106
Straight-through
twisted pair cable
Crossover
twisted pair cable
TP
TP
/EN108
Ethernet Hub Installation Guide
Normal or
MDI-X port
1
Rx
2
3
Tx
6
Normal or
MDI-X port
1
Rx
2
3
Tx
6
8146EA
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