Netgear FS509 Installation Guide - Page 44

Installation Guide for the Model FS509 Fast Ethernet Switch • 295 feet (90 meters) from the wiring closet to the wall outlet • 10 feet (3 meters) from the wall outlet to the desktop device The patch panel and other connecting hardware must meet the requirements for 100 Mbps operation (Category 5). Only 0.5 inch (1.5 cm) of untwist in the wire pair is allowed at any termination point. Category 5 Cable Specifications Table C-1 lists the electrical requirements of Category 5 UTP cable. Table C-1. Electrical Requirements of Category 5 Cable Specification Category 5 Cable Number of pairs Four Impedance 100 Ω ± 15% Mutual capacitance at 1 KHz ≤ 5.6 nF per 100 m Maximum attenuation (dB per 100 m, at 20° C) at 4 MHz: 8.2 at 31 MHz: 11.7 at 100 MHz: 22.0 NEXT loss (dB minimum) at 16 MHz: 44 at 31 MHz: 39 at 100 MHz: 32 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. C-2 Cabling Guidelines