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Re: Jumbo Frames?

On Fri, Feb 03, 2006 at 06:26:28PM +1100, Hamish Moffatt wrote:
> On Tue, Jan 31, 2006 at 02:49:39PM -0800, Andrew Sharp wrote:
> > Ur, you cannot use a crossover cable with gigabit+.  It has to be an
> > 8 wire cable of type "straight thru" which is the standard twisted
> > pair wire.  Make sure your cable, if you didn't make it yourself,
> Err, are you sure? Since all 4 pairs are used, I thought most PHY
> devices were capable of working out which was which by themselves.
> Ie cross-over will be automatically detected.

A cross-over cable is a cable to connect two ethernet (10 Mbit/s) or
fast ethernet (100 Mbit/s) NICs and uses only two wire pairs. The other
two pairs are usually not connected. A GigE NIC should be able to
detect such a cable (or rather: must be able, IIRC) and use it at the
maximum allowed speed: 100 Mbit/s.


+-- Erik Mouw -- www.harddisk-recovery.com -- +31 70 370 12 90 --
| Lab address: Delftechpark 26, 2628 XH, Delft, The Netherlands

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