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Re: OT: Four leads = 10Mbit? (was: Network speed)



On Thursday 24 July 2003 16:00, Jamin W. Collins wrote:
> On Thu, Jul 24, 2003 at 11:50:48AM -0300, breno.moiana@partekforest.com
>
> wrote:
> > >If it's running at 10Mbit, it will never be full duplex.  If you're
> > >running at 100, then it could be full or half.  If your network
> > >cables only have four leads connected, you're using 10.
> >
> > I?ve noticed that some of the most recent 100Mbit cards I've been
> > buying (Genius low end cards, model GF100TXR4) have only four
> > connection points on the RJ45 slot. However, the cards *do* work at
> > 100Mbits. Anybody with the technical knowledge on the subject could
> > please explain that? Why do 3Coms have all 8 leads, while low-end use
> > only 4? how does it affect the quality of connection?  Are all 8 leads
> > really used?
>
> No, only 4 leads are needed for both 10 and 100 Mbit connections:
>
>    http://www.makeitsimple.com/how-to/dyi_crossover.htm
>
> --
> Jamin W. Collins
>
> Linux is not The Answer. Yes is the answer. Linux is The Question. - Neo

The other 4 are used for power over ethernet, 802.11af.  It is only gigabit
ethernet that uses all four pairs for data.

David



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