Netgear FS308 FS308 Installation Guide - Page 9

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. These two figures illustrate the use of straight-through and crossover twisted pair cables. Uplink or MDI port 1 Tx 2 Straight-through twisted pair cable Normal or MDI-X port 1 Rx 2 3 Rx 6 3 Tx 6 Normal or Crossover MDI-X port twisted pair cable 1 Rx 2 Normal or MDI-X port 1 Rx 2 3 Tx 6 3 Tx 6 RJ-45 Connector 8146EC 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. Only two pairs are used for 10BASE-T wiring. 12345678 RJ-45 Connector Pin Assignment 1 2 3 6 4,5,7,8 Normal Assignment: Input Receive Data + Input Receive Data Output Transmit Data + Output Transmit Data Not used 81 711EA Uplink Assignment: Port 8 on the Model FS308 switch Output Transmit Data + Output Transmit Data Input Receive Data + Input Receive Data Not used Model FS308 Fast Ethernet Switch Installation Guide