Quick Reference Guide to 100BASE-TX
FIGURE 10.1 Connecting a computer to 100BASE-TX Ethernet
The 100BASE-TX media system is based on specifications published in the ANSI TP-PMD physical media standard. The 100BASE-TX system operates over two pairs of wires, one pair for receive data signals and the other pair for transmit data signals. Since the ANSI TP-PMD specification provides for the use of either unshielded twisted-pair or shielded twisted-pair cable, the 100BASE-TX system also does so.
The most popular wiring used today is unshielded twisted-pair cable. The two wires in each pair of the cable must be twisted together for the entire length of the segment, and kept twisted to within approximately 1/2 inch of any connector or wire termination point. This is a standard technique used to improve the signal-carrying characteristics of an unshielded wire pair.
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