Editing Power-line communication (section)

== Ultra-high frequency (≥ 100&nbsp;MHz) ==

Even higher information rate transmissions over power line use RF through microwave frequencies transmitted via a [[transverse mode]] surface wave propagation mechanism that requires only a single conductor. An implementation of this technology is marketed as [[E-Line (power line communication)|E-Line]]. These use microwaves instead of the lower frequency bands, up to 2–20&nbsp;GHz. While these may interfere with [[radio astronomy]]<ref>{{Cite web |url=http://ntrg.cs.tcd.ie/undergrad/4ba2.05/group13/index.html#21 |title=Broadband over Power Lines (BPL) |access-date=2 September 2019 |archive-date=12 February 2019 |archive-url=https://web.archive.org/web/20190212081059/http://ntrg.cs.tcd.ie/undergrad/4ba2.05/group13/index.html#21 |url-status=dead }}</ref> when used outdoors, the advantages of speeds competitive with [[fiber optic cable]]s without new wiring are likely to outweigh that.

These systems claim symmetric and full duplex communication in excess of {{nowrap|1 Gbit/s}} in each direction.<ref>{{cite news |title= Understanding the information rate of BPL and other last-mile pipes |author= Glenn Elmore |work= Computing Unplugged magazine |url= http://www.computingunplugged.com/issues/issue200608/00001828001.html |date= August 2006 |access-date= 22 July 2011 |url-status= dead |archive-url= https://web.archive.org/web/20110722055823/http://www.computingunplugged.com/issues/issue200608/00001828001.html |archive-date= 22 July 2011 |df= mdy-all }}</ref> Multiple Wi-Fi channels with simultaneous analog television in the 2.4 and 5.0&nbsp;GHz unlicensed bands have been demonstrated operating over a single medium voltage line conductor. Because the underlying propagation mode is extremely [[broadband]] (in the technical sense), it can operate anywhere in the 20&nbsp;MHz{{snd}}20&nbsp;GHz region. Also since it is not restricted to below 80&nbsp;MHz, as is the case for high-frequency BPL, these systems can avoid the interference issues associated with use of shared spectrum with other licensed or unlicensed services.<ref>{{cite web |title= Introduction to the Propagating TM Wave on a Single Conductor |author= Glenn Elmore |date= 27 July 2009 |url= http://www.corridor.biz/FullArticle.pdf |publisher= Corridor Systems |access-date= 22 July 2011 }}</ref>