Category 5 (or CAT5 as it is commonly called) is the most popular UTP cable being installed for data communications. CAT5 must be able to support voice or data at 100 MHz over 22 or 24 AWG. CAT5 is typically used for high-speed twisted-pair networks such as 100BASE-TX, Fast Ethernet, and ANSI X3T9.5 100-Mbps TP-PMD (FDDI over UTP).
American Wire Gauge (AWG)
It is a U.S. standard set of non-ferrous wire conductor sizes. The "gauge" means the diameter. Non-ferrous includes copper and also aluminium and other materials, but is most frequently applied to copper household electrical wiring and telephone wiring.
Typical household wiring is AWG number 12 or 14. Telephone wire is usually 22, 24, or 26. The higher the gauge number, the smaller the diameter and the thinner the wire. Since thicker wire carries more current because it has less electrical resistance over a given length, thicker wire is better for longer distances. For this reason, where extended distance is critical, a company installing a network might prefer telephone wire with the lower-gauge, thicker wire of AWG 24 to AWG 26.
AWG is sometimes known as Brown and Sharpe (B&S) Wire Gauge.
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