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Em3rgent0rdr (talk | contribs) →Features: made "Limitations" subheading and added DigiKey citation about data rate only half of possible bandwidth. Also the digikey says basically the same thing the Cisco wiki said, so reworded the quote from digikey so it is no longer an "according to cisco" and added digikey as a reference to that too. |
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The [[DC component]] of the encoded signal is not dependent on the data and therefore carries no information. Therefore connections may be [[Inductive coupling|inductively]] or [[Capacitive coupling|capacitively]] coupled, allowing the signal to be conveyed conveniently by galvanically isolated media (e.g., Ethernet) using a [[network isolator]]—a simple one-to-one [[pulse transformer]] which cannot convey a DC component.
=== Limitations ===
According to [[Cisco]], "Manchester encoding introduces some difficult frequency-related problems that make it unsuitable for use at higher data rates".<ref>{{citation |url=http://docwiki.cisco.com/wiki/Ethernet_Technologies |title=Ethernet Technologies |publisher=[[Cisco Systems]] |access-date=2017-09-12 |quote=Manchester encoding introduces some difficult frequency-related problems that make it unsuitable for use at higher data rates. |archive-url=https://web.archive.org/web/20181228005303/http://docwiki.cisco.com/wiki/Ethernet_Technologies |archive-date=2018-12-28 |url-status=dead}}</ref><!--Difficulties are in meeting [[Title 47 CFR Part 15]] and other RF emissions requirements.-->▼
Manchester coding's data rate is only half that of a non-coded signal, which limits its usefulness to systems where bandwidth is not an issue, such as a [[local area network (LAN)]].<ref name=":0">{{Cite web |last=Oed |first=Richard |date=2022-04-22 |title=Old, but Still Useful: The Manchester Code |url=https://www.digikey.com/en/blog/old-but-still-useful-the-manchester-code |url-status=live |archive-url=https://web.archive.org/web/20220822210500/https://www.digikey.com/en/blog/old-but-still-useful-the-manchester-code |archive-date=2022-08-22 |access-date=2023-02-02 |website=[[DigiKey]]}}</ref>
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There are more complex codes, such as [[8B/10B encoding]], that use less [[bandwidth (signal processing)|bandwidth]] to achieve the same data rate but may be less tolerant of frequency errors and [[jitter]] in the transmitter and receiver reference clocks.{{citation needed|date=November 2015}}
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