Editing Power over Ethernet (section)

===Single-pair Ethernet===
The ''IEEE 802.3bu-2016''<ref>{{cite web |url=http://www.ieee802.org/3/bu/index.html |title=IEEE P802.3bu 1-Pair Power over Data Lines (PoDL) Task Force |date=2017-03-17 |access-date=2017-10-30 |archive-date=2017-10-10 |archive-url=https://web.archive.org/web/20171010063853/http://www.ieee802.org/3/bu/index.html |url-status=live }}</ref> amendment introduced ''single-pair'' ''Power over Data Lines ({{visible anchor|PoDL}})'' for the single-pair Ethernet standards [[100BASE-T1]] and [[1000BASE-T1]] intended for automotive and industrial applications.<ref>{{cite web |url=https://www.eenewsautomotive.com/news/new-automotive-power-over-ethernet-standard-extends-wattage-range |title=Automotive power-over-Ethernet standard extends wattage range |date=2017-03-13 |access-date=2021-01-16 |archive-date=2021-01-22 |archive-url=https://web.archive.org/web/20210122004440/https://www.eenewsautomotive.com/news/new-automotive-power-over-ethernet-standard-extends-wattage-range |url-status=live }}</ref> On the two-pair and four-pair standards, the power voltage is applied between one conductor of each of two pairs, so that within each pair there is no differential voltage other than that representing the transmitted data. With single-pair Ethernet, power is transmitted in parallel to the data. PoDL initially defined ten power classes, ranging from 0.5 to 50&nbsp;W (at PD).

Subsequently, PoDL was added to the single-pair variants [[Classic Ethernet#10BASE-T1|10BASE-T1]],<ref name="802.3cg">IEEE 802.3cg-2019</ref> [[2.5GBASE-T and 5GBASE-T|2.5GBASE-T1, 5GBASE-T1]], and [[10 Gigabit Ethernet#10GBASE-T1|10GBASE-T1]],<ref>IEEE 802.3ch-2020</ref> and {{asof|2021|lc=y}} it includes a total of 15 power classes with additional intermediate voltage and power levels.<ref name="802.3cg" />