Re: 8139 full duplex?

James Sutherland (jas88@cam.ac.uk)
Fri, 16 Feb 2001 09:32:34 +0000 (GMT)


On Fri, 16 Feb 2001, Rogier Wolff wrote:

>
> Hi All,
>
> I have a bunch of computers with 8139 cards. When I moved the cables
> over from my hub to my new switch all the "full duplex" lights came on
> immediately.

That's what you would expect: they will auto-negotiate full duplex, in the
same way they would negotiate 10 or 100 Mbit/sec.

> Would this mean that the driver/card already were in full-duplex?

No, that's not possible. They just automatically configured for the
best performance available - in this case, full duplex.

> That would explain me seeing way too many collisions on that old hub
> (which obviously doesn't support full-duplex).

No, it would just prevent your card working. Large numbers of collisions
are normal during fast transfers across a hub.

James.

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