If the ports are set to "auto" detect speed, you will get a connection at the highest possible speed that the ports are capable of, regardless of the cable type. Whether the cable is Cat5 or 6 or 5e or 4 makes no difference
I think what deilert is referring to is, the connection speed depends on whether the pinout of the crossover cable is for Fast Ethernet (two of four pairs) or for Gigabit Ethernet (all four pairs). Cat5 or better cable is specified for both Fast Ethernet and Gigabit Ethernet over copper.
If crossover cable is pinned out to cross the pairs for Fast Ethernet only, then Fast Ethernet is the speed that should come up on the 10/100/1000 autodetect. You should cross all four pairs to get it to come up as Gigabit Ethernet. Here's a link to the pinouts:
Of course, I am assuming you're talking about interconnecting two 3550 switches via 10/100/1000 ports. Obviously if you're talking about two 10/100 ports then the best speed you'll get is 100.
That being said, some switches out there have the ability to auto-cross ports, in which case the issue of Fast vs. Gig Ethernet crossover patches is no longer an issue. Just use a straight-through patch cable and be done with it. (Not sure if Cisco's switches do this, though. I guess I've got some research to do...)
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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