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Installation Guide for the Model EN516 Ethernet Hub
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. Refer to the
installation instructions in Chapter 3, "Installation," for appropriate cable use and connection.
Figure B-1 and Figure B-2 illustrate the use of straight-through and crossover twisted pair cables.
1
Tx
2
1
3
Rx
6
Key:
1 = Uplink or MDI port
2 = Normal or MDI-X port
Figure B-1.
Straight-through twisted pair cable
1
Rx
2
1
3
Tx
6
Key:
1 = Normal or MDI-X port
2 = Normal or MDI-X port
Figure B-2.
Crossover twisted pair cable
B-2
1
Rx
2
2
3
Tx
6
7181
1
Rx
2
2
3
Tx
6
7182
Cabling Specifications
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