Editing Twisted pair (section)

{{Short description|Type of wiring used for communications}}
{{About|the type of wiring|the film|Twisted Pair (film)}}
{{Redirect|Copper line|the San Diego Trolley line|Copper Line (San Diego Trolley)}}
{{Use American English|date=December 2024}}

[[File:25 pair color code chart.svg|thumb|upright=0.9|[[25-pair color code]] chart]]

'''Twisted pair''' cabling is a type of [[communications cable]] in which two conductors of a single [[Electronic circuit|circuit]] are twisted together for the purposes of improving [[electromagnetic compatibility]]. Compared to a [[Single-ended signaling|single conductor]] or an untwisted [[balanced pair]], a twisted pair reduces [[electromagnetic radiation]] from the pair and [[crosstalk]] between neighboring pairs and improves rejection of external [[electromagnetic interference]]. It was invented by [[Alexander Graham Bell]].<ref>{{cite book |first1=David |last1=Barnett |first2=David |last2=Groth |first3=Jim |last3=McBee |title=Cabling: The Complete Guide to Network Wiring |date=2004 |publisher=SYBEX |location=San Francisco |isbn=9780782143317 |page=11 |edition=3rd |url=https://books.google.com/books?id=AKDSTYu3nl4C&pg=PA11}}</ref>

For additional noise immunity, twisted-pair cabling may be [[Shielded cable|shielded]]. Cable with shielding is known as '''shielded twisted pair''' ('''STP''') and without as '''unshielded twisted pair''' ('''UTP''').