Category 5 Cable Specifications; Twisted Pair Cables - NETGEAR GS108T - ProSafe - Gigabit Smart Switch Software Administration Manual

GS108T Smart Switch Software Administration Manual

Category 5 Cable Specifications

Ensure that the fiber cable is crossed over to guarantee link.
Table C-1 lists the electrical requirements of Category 5 UTP cable.
Table C-1. 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)

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.
C-2
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
v1.0, December 2007
Network Cabling