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Ethernet over twisted-pair technologies use twisted-pair cables for the physical layer of an Ethernet computer network. They are a subset of all Ethernet physical layers . Early Ethernet used various grades of coaxial cable , but in 1984, StarLAN showed the potential of simple unshielded twisted pair .
The IEEE 802.3ch-2020 2.5GBASE-T1, 5GBASE-T1, and 10GBASE-T1 standards are derived from the IEEE 802.3bp-2016 1000BASE-T1 Ethernet over single twisted pair standard, and share very little in common with the similarly named 2.5GBASE-T and 5GBASE-T standards at the PHY layer. 2.5GBASE-T1, 5GBASE-T1, and 10GBASE-T1 can run over a single twisted ...
Third generation Power over Ethernet with up to 100 W using four pairs in balanced–twisted-pair cabling (4PPoE), including 10GBASE-T, lower standby power and specific enhancements to support IoT applications (e.g. lighting, sensors, building automation). 802.3bu: 2016-12 Power over Data Lines (PoDL) for single twisted pair Ethernet
StarLAN was the first IEEE 802.3 standard for Ethernet over twisted pair wiring. It was standardized by the IEEE Standards Association as 802.3e in 1986, as the 1BASE5 version of Ethernet . The StarLAN Task Force was chaired by Bob Galin.
10 Mbit/s over copper twisted pair cabling, star topology – evolved into 10BASE-T LattisNet UTP Proprietary (1987) 8P8C 100 m voice-grade 10 Mbit/s over copper twisted pair cabling, star topology – evolved into 10BASE-T 10BASE-T: 802.3i-1990 (14) 8P8C (IEC 60603-7) 100 m Cat-3: Runs over four wires (two twisted pairs).
The terminology generally refers to variants of the Ethernet over twisted pair technology that use a female 8P8C port connection on a computer, or other network device.. The X refers to the fact that transmit wires on an MDI device must be connected to receive wires on an MDI-X device.