Talk:Ethernet physical layer
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[edit] Does this page just duplicate other pages?
There's already a gigabit Ethernet page giving details of gigabit Ethernet physical layers, and the Fast Ethernet page should probably swallow the pages for the individual 100Mbit/second standards; this page doesn't even mention 10 gigabit Ethernet. Guy Harris 17:19, 14 June 2006 (UTC)
- Probably it is, though User:Oakad clearly did a nice job with it. It would probably be better to merge the respective wording and tables onto the Fast Ethernet and gigabit Ethernet and the not-yet existant early/ancient/original/10mbs ethernet pages. -- KelleyCook 18:58, 14 June 2006 (UTC)
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- I've merged stuff from here into Fast Ethernet, and turned the "Fast Ethernet" section of this page into a summary that points to the Fast Ethernet page. I'll look at doing the same with the Gigabit Ethernet stuff.
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- The Varieties of Ethernet page also has a summary of various Ethernet physical layers; should the two pages be merged? Guy Harris 21:06, 15 June 2006 (UTC)
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- Yes. I've done that merge. Guy Harris 08:08, 3 October 2006 (UTC)
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[edit] Echo cancelation
This sentence: "Telephones also use echo cancellation to simultaneously transmit in both direction over a single cable pair" is probably wrong. Analog telephone does not use echo cancelation. This would require sophisticated signal processing equipment which was not available in the age of analog telephony. Telephone does use echo cancelation if transmitted over a digitial medium such as ATM or IP with higher delay as pure analog switching, because the echo would be disturbing. The need for echo cancelation was one of the main critic points in ATM: 53 byte cells are too long to use without echo cancelation and thus made this expensive equipment nescesarry when ATM was introduced in the phone network, while still beeing way too short for sensible data transfers. citation: "Interconnections: Bridges, Routers, Switches, and Internetworking Protocols" by Radia Perlman.
