Editing Twisted pair (section)

==Unshielded twisted pair==
[[File:UTP-cable.svg|thumb|Cross-section of cable with four unshielded twisted pairs]]

Unshielded twisted pair (UTP) cables are found in many [[Ethernet]] networks and telephone systems. For indoor telephone applications, UTP is often grouped into sets of 25 pairs according to a standard [[25-pair color code]] originally developed by [[AT&T Corporation|AT&T]]. A typical subset of these colors (white/blue, blue/white, white/orange, orange/white) shows up in most UTP cables. The cables are typically made with [[copper]] wires measured at 22 or 24 [[American Wire Gauge]] (AWG) (0.644 or 0.511&nbsp;mm²),<ref>{{cite book|author=Steven T. Karris|title=Networks: Design and Management|url=https://books.google.com/books?id=iWMDf4ciB1AC&pg=SA6-PA2|year=2009|publisher=Orchard Publications|isbn=978-1-934404-15-7|page=6}}</ref> with the colored insulation typically made from an insulator such as [[polyethylene]] or [[Fluorinated ethylene propylene|FEP]] and the total package covered in a polyethylene jacket.

For urban outdoor telephone cables containing hundreds or thousands of pairs, the cable is divided into small but identical bundles. Each bundle consists of twisted pairs that have different twist rates, as pairs having the same twist rate within the cable can still experience some degree of [[crosstalk]]. The bundles are in turn twisted together to make up the cable.

[[File:UTP cable.jpg|thumb|Unshielded twisted pair cable with different twist rates]]

UTP is also the most common cable used in [[computer networking]]. Modern [[Ethernet]], the most common data networking standard, can use UTP cables, with increasing data rates requiring higher specification variants of the UTP cable. Twisted-pair cabling is often used in data networks for short and medium-length connections because of its relatively lower costs compared to [[optical fiber]] and [[coaxial cable]].

As UTP cable [[Bandwidth (signal processing)|bandwidth]] has improved to match the [[baseband]] of [[television]] signals, UTP is now used in some [[video]] applications, primarily in [[security camera]]s.<ref>{{cite web |url=https://www.securityinfowatch.com/video-surveillance/article/10523128/troubleshooting-utp-cctv-systems |title=Troubleshooting UTP CCTV Systems |author=Christine Baeta |date=2008-10-27}}</ref> As UTP is a balanced transmission line, a [[balun]] is needed to connect to unbalanced equipment, for example any using [[BNC connector]]s and designed for coaxial cable.