Editing Twisted pair (section)

===Building infrastructure===
{| class="wikitable sortable"
|+Standard types of twisted pair cabling
|-
! Name
! Typical construction
! Bandwidth
! Applications
! Notes
|-
| [[Category 1 cable|Level 1]]
|
| 400&nbsp;kHz
| Telephone and modem lines
| Not described in EIA/TIA recommendations. Unsuitable for modern systems.<ref name="cisco">{{cite web|title=CCNA: Network Media Types|url=http://www.ciscopress.com/articles/article.asp?p=31276}}</ref>
|-
| [[Category 2 cable|Level 2]]
|
| 4&nbsp;MHz
| Older terminal systems, e.g. [[IBM 3270]]
| Not described in EIA/TIA recommendations. Unsuitable for modern systems.<ref name=cisco />
|-
| [[Category 3 cable|Cat 3]]
| UTP<ref name="dcuse" />
| 16&nbsp;MHz<ref name="dcuse" />
| [[10BASE-T]], [[100BASE-T4]]<ref name="dcuse" />
| Described in EIA/TIA-568. Unsuitable for speeds above {{nowrap|16 Mbit/s}}. Now mainly for telephone cables.<ref name="dcuse" />
|-
| [[Category 4 cable|Cat 4]]
| UTP<ref name="dcuse" />
| 20&nbsp;MHz<ref name="dcuse" />
| {{nowrap|16 Mbit/s}} [[Token Ring]]<ref name="dcuse" />
| Not commonly used<ref name="dcuse" />
|-
| [[Cat 5]]
| UTP<ref name="dcuse" />
| 100&nbsp;MHz<ref name="dcuse" />
| [[100BASE-TX]], [[1000BASE-T]]<ref name="dcuse" />
| Common for current LANs. Superseded by Cat 5e, but most Cat 5 cables meet Cat 5e standards.<ref name="dcuse" /> Limited to 100&nbsp;m between equipment.
|-
| [[Cat 5e]]
| UTP,<ref name="dcuse" /> F/UTP, U/FTP<ref>{{Cite web|url=https://sewelldirect.com/learning-center/utp-vs-stp-cable|title=Using UTP Cat5e vs. STP Cat5e Cable - SewellDirect.com|website=sewelldirect.com|access-date=2018-08-19}}</ref>
| 100&nbsp;MHz<ref name="dcuse" />
| [[1000BASE-T]], [[2.5GBASE-T]]<ref name="dcuse" />
| Enhanced Cat 5. Common for current LANs. Same construction as Cat 5, but with better testing standards.<ref name="dcuse" /> Limited to 100&nbsp;m between equipment.
|-
| [[Cat 6]]
| UTP,<ref name="dcuse" /> F/UTP, U/FTP<ref>{{Cite news|url=https://customcable.ca/cat5-vs-cat6/|title=CAT3 vs. CAT5 vs. CAT6 - CustomCable|date=2011-12-24|work=CustomCable|access-date=2018-08-19|language=en-US}}</ref>
| 250&nbsp;MHz<ref name="dcuse" />
| [[5GBASE-T]], [[10GBASE-T]]
| ISO/IEC 11801 2nd Ed. (2002), ANSI/TIA 568-B.2-1. Limited to 55&nbsp;m distance at 10GBASE-T
|-
| [[Cat 6A]]
| UTP, F/UTP, U/FTP, S/FTP
| 500&nbsp;MHz
| [[5GBASE-T]], [[10GBASE-T]]
| Improved standards, tested to 500&nbsp;MHz. Full 100&nbsp;m distance at 10GBASE-T ISO/IEC 11801 2nd Ed. Am. 2. (2008), ANSI/TIA-568-C.1 (2009)
|-
| [[Category 7|Cat 7]]
| S/FTP, F/FTP
| 600&nbsp;MHz<ref name="CompTIA">{{cite book | url=https://books.google.com/books?id=iJVFEAAAQBAJ&dq=category+3+cable+frequency&pg=PT142 | isbn=978-1-119-80696-7 | title=CompTIA Network+ Review Guide: Exam N10-008 | date=28 September 2021 | publisher=John Wiley & Sons }}</ref>
| {{dunno}}
| ISO/IEC 11801 2nd Ed. (2002). Only with [[GG45]] or [[TERA]] connectors. It is not recognized by the [[Electronic Industries Alliance|EIA]]/[[Telecommunications Industry Association|TIA]].
|-
| [[Category 7A|Cat 7<sub>A</sub>]]
| S/FTP, F/FTP
| 1&nbsp;GHz<ref name="CompTIA" />
| {{dunno}}
| ISO/IEC 11801 2nd Ed.&nbsp;Am.&nbsp;2. (2008). Only with GG45 or TERA connectors. It is not recognized by the EIA/TIA.
|-
| [[Cat 8.1]]
| F/UTP, U/FTP
| 2&nbsp;GHz<ref name="CompTIA" />
| [[25GBASE-T]], [[40GBASE-T]]
| ANSI/TIA-568-C.2-1, ISO/IEC 11801-1:2017
|-
| [[Cat 8.2]]
| S/FTP, F/FTP
| 2&nbsp;GHz
| [[25GBASE-T]], [[40GBASE-T]]
| ISO/IEC 11801-1:2017
|}