Editing Category 3 cable (section)

==Networking==
[[File:Cat 3 cable 6.jpg|thumb|A category 3 cable]]
{{no wrap|Cat 3}} was widely used in [[computer network]]ing in the early 1990s for [[10BASE-T]] Ethernet and, to a much lesser extent, for [[100BaseVG]] Ethernet, [[Token Ring]] and [[100BASE-T4]]. The original [[Power over Ethernet]] 802.3af specification supports the use of {{no wrap|Cat 3}} cable, but the later 802.3at Type 2 high-power variation does not.<ref name="33.1.1c">IEEE 802.3at-2009, clause 33.1.1c</ref> In some use cases and for short distances, Cat 3 may be capable of carrying 100BASE-TX (2 pairs) or even 1000BASE-T (4 pairs). Such use cases include hobbyist retrofitting short home telephone Cat 3 networks for Ethernet.<ref>[https://www.reddit.com/r/networking/comments/1w71mh/gigabit_over_cat3_wtf/ Gigabit over Cat3, WTF]{{sps|date=November 2022}}</ref><ref>[https://www.youtube.com/watch?v=Bx98ACGSSZs CONVERTING HOME TELEPHONE WIRING TO ETHERNET]{{sps|date=November 2022}}</ref><ref>[https://www.youtube.com/watch?v=hvUH-Cqtp6w How to convert your telephone line to an internet line: A complete guide]{{sps|date=November 2022}}</ref>

Dedicated 100BASE-T4 networks, supporting {{nowrap|100 Mbit/s}} over Cat 3, appear to have been a rarity as very few network interface controllers and switches were ever released. Some examples include the [[3com]] 3C250-T4 Superstack II HUB 100, [[IBM]] 8225 Fast Ethernet Stackable Hub<ref>[https://www.ibm.com/common/ssi/cgi-bin/ssialias?appname=skmwww&htmlfid=897%2FENUS196-117&infotype=AN&mhq=IBM%20Network%20Station%208361%20Series%20100&mhsrc=ibmsearch_a&subtype=CA IBM 8225 Fast Ethernet Stackable Hub]</ref> and [[Intel]] LinkBuilder FMS 100 T4.<ref>{{cite web|url=https://techlibrary.hpe.com/docs/products/eos/3Com-End-of-Sale%20dates.pdf|title=3Com Product End of Sale dates|website=[[Hewlett Packard Enterprise]]}}</ref><ref>{{cite web | url=https://manualzz.com/doc/3244934/intel-express-100base-t4-user-s-manual | title=Intel Express 100BASE-T4 User's Manual | website=Manualzz}}</ref> The same applies to [[network interface controller]] cards. Bridging 100BASE-T4 with 100BASE-TX required additional network equipment.