Netgear SW510 Installation Guide - Page 38

Installation Guide for the Model SW510 and Model SW518 Ethernet Switches Cable Specifications Category 5 twisted pair cable must be used for 100 Mbps connections. For 10 Mbps connections, Category 3, 4, or 5 cable can be used; however, NETGEAR highly recommends Category 5. Category 5 cable will prevent unnecessary expenses or confusion if you upgrade to Fast Ethernet. Table 5-1 lists the electrical requirements of cables. Table 5-1. Specification Number of pairs Impedance Mutual capacitance at 1 KHz Maximum attenuation (dB per 100 m, at 20 C) NEXT loss (dB minimum) Electrical requirements of Category 3, 4, and 5 cables Category 3 Four 100 Ω ± 15% ≤ 6.6 nF per 100 m Category 4 Four 100 Ω ± 15% ≤ 5.6 nF per 100 m Category 5 Four 100 Ω ± 15% ≤ 5.6 nF per 100 m at 4 MHz: 5.6 at 10 MHz: 9.8 at 16 MHz: 13.1 at 4 MHz: 32 at 10 MHz: 26 at 16 MHz: 23 at 4 MHz: 4.3 at 10 MHz: 7.2 at 16 MHz: 8.9 at 4 MHz: 47 at 10 MHz: 41 at 16 MHz: 38 at 4 MHz: 8.2 at 31 MHz: 11.7 at 100 MHz: 22 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. Some repeaters and switch ports are media-dependent interfaces with crossover ports, referred to as MDI-X or Normal ports. Computer ports and PC adapter card ports are usually media-dependent interface ports, referred to as MDI or Uplink ports. Refer to the installation instructions in Chapter 4, "Installation," for appropriate cable use and connection. C-2 Ethernet and Cabling Guidelines