Symbol Technologies ES3000 manual Category 5 Cable, Twisted Pair Cables, Termination Method

B-2ES3000 User Guide

B.1.2 Termination Method

To minimize cross-talk noise, maintain the twist ratio of the cable up to the point of termination; verify untwist at any RJ-45 plug or patch panel does not exceed 0.5 inch (1.5 cm).

B.2 Category 5 Cable

Category 5 distributed cable that meets ANSI/EIA/TIA-568-A building wiring standards can be a maximum of 328 feet (ft) or 100 meters (m) in length, divided as follows:

•20 ft (6 m) between the hub and the patch panel (if used)

•295 ft (90 m) from the wiring closet to the wall outlet

•10 ft (3 m) from the wall outlet to the desktop device

The patch panel and other connecting hardware is required to 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.

B.2.1 Category 5 Cable Specifications

Ensure the fiber cable is crossed over to guarantee link.

Specifications	Category 5 Cable Requirements
Number of pairs	Four
Impedance	100 ? ± 15%
Mutual capacitance at 1 KHz	=5.6 nF per 100 m
Maximum attenuation (dB per 100 m, at 20° C)	at 4 MHz: 8.2at 31 MHz: 11.7at 100 MHz: 22.0
NEXT loss (dB minimum)	at 16 MHz: 44at 31 MHz: 39at 100 MHz: 32

B.3 Twisted Pair Cables

For two devices to communicate, the transmitter of each device is required to 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