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C-3cabling guidelines
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
Specifications Category 5 Cable Requirements
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. Auto Uplink
TM
automatically senses which
connection, MDI or MDI-X, is needed and makes the right connection.