Cat 5 cable

Category (cat) 5 cable


Category 5 (cat 5) cable is a type of twisted pair network wiring in which there is a certain number of twists per foot. It is the most commonly cabling used in computer networks.

Cable standard[]

The specification for Category 5 cable was defined in American National Standards Institute| (ANSI)/EIA-568-A, with clarification in TSB-95. These documents specified performance characteristics and test requirements for frequencies of up to 100 MHz.

Category 5[1] cable includes 4 twisted pairs in a single cable jacket. This use of balanced lines helps preserve a high signal-to-noise ratio despite interference from both external sources and other pairs (this latter form of interference is called crosstalk. It is most commonly used for 100 Mbit/s networks, such as 100BASE-TX Ethernet, although IEEE 802.3 defines standards for 1000BASE-T – Gigabit Ethernet over category 5 cable. Each of the four pairs in a Cat 5 cable has differing precise number of twists per meter based on prime numbers to minimize crosstalk between the pairs. On average there are 6 twists per 5 centimeters. The pairs are made from 24 American wire gauge (AWG) copper wires within the cables.


  1. 090524



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