Netgear GSM7312 FSM7326P User Manual - Page 337
Twisted Pair Cables, SPECIFICATIONS, CATEGORY 5 CABLE REQUIREMENTS
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User Manual for the NETGEAR 7300 Series Layer 3 Managed Switch Software Table 13-3. Electrical Requirements of Category 5 Cable SPECIFICATIONS Number of pairs Impedance Mutual capacitance at 1 KHz Maximum attenuation (dB per 100 m, at 20° C) NEXT loss (dB minimum) CATEGORY 5 CABLE REQUIREMENTS Four 100 ± 15% 5.6 nF per 100 m at 4 MHz: 8.2 at 31 MHz: 11.7 at 100 MHz: 22.0 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. Auto Uplink technology automatically senses which connection, MDI or MDI-X, is needed and makes the right connection. Figure 13-1 illustrates straight-through twisted pair cable. Figure 13-1: Straight-Through Twisted-Pair Cable Cabling Guidelines B-3 202-10009-01_060204
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