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From: Spam Hater
Subject: Re: High-speed components/design
X-Newsreader: Forte Free Agent 1.92/32.572
NNTP-Posting-Date: Sat, 14 Dec 2002 12:45:42 EST
Organization: Prodigy Internet http://www.prodigy.com
Date: Sat, 14 Dec 2002 17:45:42 GMT
Thank you for the correction. I should have looked it up first.
On 14 Dec 2002 05:34:20 GMT, firstname.lastname@example.org (Wim Lewis)
>In article ,
>Spam Hater wrote:
>>1) 100 megabit ethernet is (IIRC) 25 megabaud. Four bits per
>100baseTX is essentually 10baseT operating at 10x the speed and with a 4/5
>line code instead of 10baseT's Manchester (1/2) line code --- so
>its symbol rate is 125Mbaud. (10baseT's symbol rate is 20Mbaud.)
>100baseT4 is an alternate "fast ethernet" technology that used three
>simultaneous 33Mbps streams on separate pairs of wires, but it
>didn't really catch on. 100baseTX, like 10baseT, only uses two of
>the four pairs in the cable; 100baseT4 used all four pairs.
>Gigabit ethernet uses four simultaneous 250Mbps streams (with hybrids
>to allow each twisted pair to be used for both directions simultaneously),
>each stream using a 5-level code to transmit 2 bits per symbol (plus
>the fifth level for coding overhead) at 125Mbaud.
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