[Gllug] Observed speed of gigabit ethernet only about 1/4 or 1/5 of advertised

[Rich Walker]

James Roberts <jr at stabilys.com> writes:

> Rich Walker wrote:
>> James Roberts <jr at stabilys.com> writes:
>>> 100Mbps duplex *is* 200Mbps...
>>>
>>> gigabit duplex is 2000Mbps (should see 17/1800)
>> 
>> Didn't they cheat for gigabit and use all the wires in the cable anyway
>> (i.e., no special duplex mode...)?
>
> Sort of. Not quite. See:
>  
> http://www.usenix.org/publications/library/proceedings/als00/2000papers/papers/full_papers/ong/ong_html/node5.html
>
> 'Course to make full use of it you need:
>
> http://sd.wareonearth.com/~phil/jumbo.html

What I meant was:

> Note that 1000BASE-T uses four pairs of cable instead of the two pairs
> used by 100BASE-T2.

from:
http://www.commsdesign.com/main/9808fe1.htm

cheers, Rich.

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