EIA/TIA wiring standards were first published in 1991 and have been evolving ever since. The EIA/TIA-568 standard defines the specification of the cable to be used as well as some installation rules. The latest version of the EIA/TIA standard is 568B, which contains some minor enhancements to the original 1991 standard. The most popular is Category 5, the highest-quality UTP cable. It is tested at 100 MHz, allowing it to run high-speed protocols such as 100 Mbps Fast Ethernet and FDDI. Category 5 cable also uses either 22 or 24 AWG unshielded twisted pair wire with impedance of 100 ohms.
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