World Library  
Flag as Inappropriate
Email this Article

Category 3 cable

Article Id: WHEBN0000100632
Reproduction Date:

Title: Category 3 cable  
Author: World Heritage Encyclopedia
Language: English
Subject: Ethernet over twisted pair, TIA/EIA-568, ISO/IEC 11801, Twisted pair, Local area network
Collection: Ethernet Cables, Networking Hardware, Signal Cables
Publisher: World Heritage Encyclopedia

Category 3 cable

Category 3 cable, commonly known as Cat 3 or station wire, and less commonly known as VG or Voice-grade (as, for example, in 100BaseVG), is an unshielded twisted pair (UTP) cable used in telephone wiring.

It is part of a family of copper cabling standards defined jointly by the Electronic Industries Alliance and the Telecommunications Industry Association and defined in TIA/EIA-568-B. Although designed to reliably carry data up to 10 Mbit/s,[1] modern data networks run at much higher speeds, and Cat5e or Cat6 is now used for all new installations - and many large institutions require any repairs or additions to existing buildings that currently use Cat3 to be upgraded to Cat5e.[2]


  • Networking 1
  • See also 2
  • References 3
  • External links 4


Cat 3 was widely used in computer networking in the early 1990s for 10BASE-T Ethernet (and to a lesser extent for 100BaseVG Ethernet, token ring and 100BASE-T4), but from the early 2000s new structured cable installations were almost invariably built with the higher performing Cat 5e or Cat 6 cable required by 100BASE-TX.

The original Power over Ethernet specification supports the use of Cat 3 cable, but the new 802.3at Type 2 high-power variation does not.[3]

See also


  1. ^ CCNA: Network Media Types,
  2. ^ "University of Wisconsin - Standards for the Installation of New Data/Voice Jacks". Retrieved 2013-09-17. 
  3. ^ IEEE 802.3at-2009, clause 33.1.1c

External links

  • How It's Made - Category 3 Cable Video
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.