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Model DS508/DS516/DS524 Dual Speed Stackable Hub Installation Guide
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 repeaters and switch ports are media-dependent interfaces with
crossover ports, referred to as MDI-X or Normal ports. Computers 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.
RJ-45 Connector
The RJ-45 connector (shown in the illustration with an RJ-45 plug) is used to connect
workstations, hubs, and switches through unshielded twisted pair cable. The RJ-45 connector
accepts four-pair Category 3 or Category 5 UTP cable.
Cable & Connector Information
Straight-through
twisted pair cable
Crossover
twisted pair cable
8146EB
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
711EA
18
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