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Re: Problems connectivity GE on Foundry BigIron to Cisco 2950T
From: Jeff Rosowski <rosowskij () ie ymp gov>
Date: Mon, 6 Feb 2006 09:50:00 -0800 (PST)

According to "Ethernet, The Definitive Guide", that feature is an
optional part of the spec.

One thing I've heard people encounter is that if they use a cross-over
cable, which probably really implies a 100BASE-TX cross-over, then the
ports only go to 100Mbps. A Gig-E rated straight through, in conjunction
with the automatic crossover feature, was necessary to get to GigE.

A lot of cross over cables only cross pairs 1-2 with 3-6, leaving 4-5, and 7-8 as straight through. Gig-E uses all four pair.

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