Twisted Pair Cables; Figure C-1. Straight-Through Twisted Pair Cable; Figure C-2. Crossover Twisted Pair Cable - NETGEAR FS518T FS518T FS518T Installation Manual

FS518T.Manual.FINAL 5/19/00

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 media-dependent interfaces with
built-in crossover ports, called MDI-X or normal ports.
Figure C-1 illustrates straight-through twisted pair cable.
Tx
A
Rx
Key:
A = Uplink or MDI port (as on a PC)
B = Normal or MDI-X port (as on a hub or switch)
1, 2, 3, 6 = Pin numbers
Figure C-1.
Figure C-2 illustrates crossover twisted pair cable.
1
Rx
2
B
3
Tx
6
Key:
B = Normal or MDI-X port (as on a hub or switch)
1, 2, 3, 6 = Pin numbers

Figure C-2. Crossover Twisted Pair Cable

12:55 PM Page 41
1
2
3
6
Straight-Through Twisted Pair Cable
1
Rx
2
B
3
Tx
6
736EA
1
Rx
2
B
3
Tx
6
737EA
cabling guidelines C-3