Category 4 cable (Cat 4) is a cable that consists of eight copper wires arranged in four unshielded twisted pairs (UTP) supporting signals up to 20 MHz.[1] It is used in telephone networks which can transmit voice and data up to 16 Mbit/s.[2]

For a brief period it was used for some Token Ring,[3] 10BASE-T, and 100BASE-T4 networks, but was quickly superseded by Category 5 cable. It is no longer common or used in new installations and is not recognized by the current version of the ANSI/TIA-568 data cabling standards.

References

  1. ↑ Spurgeon, Charles E (2000). Ethernet: the definitive guide. O'Reilly. p. 212. ISBN 9781565929524.
  2. ↑ CCNA: Network Media Types
  3. ↑ Local Area Network Concepts and Products: LAN Architecture (PDF), IBM, May 1996, archived from the original (PDF) on 2013-06-23
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