Netgear FS516 FS516 Installation Guide - Page 39

Twisted Pair Cables, interface ports

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Installation Guide for the Model FS516 Fast Ethernet Switch 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. 1 Tx 2 A 3 Rx 6 1 Rx 2 B 3 Tx 6 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 736EA Figure C-1. Straight-Through Twisted Pair Cable Figure C-2 illustrates crossover twisted pair cable. 1 Rx 2 B 3 Tx 6 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 737EA Figure C-2. Crossover Twisted Pair Cable Cabling Guidelines C-3

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Installation Guide for the Model FS516 Fast Ethernet Switch
Cabling Guidelines
C-3
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.
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.
Straight-Through Twisted Pair Cable
Figure
C-
2
illustrates crossover twisted pair cable.
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
736EA
Tx
Rx
1
2
3
6
Tx
Rx
1
2
3
6
A
B
737EA
B
B
1
2
3
6
1
2
3
6
Tx
Rx
Tx
Rx