On 22/11/2009 12:46, Juuso Lehtinen wrote:
Any ideas what might be causing this. I wonder if I'm running into some kind
of minimum cable length problem. Switches are sitting adjacent to each other
in a rack and connected with very short cables (0.5m ~ 2 ft).
Are you sure you're using the correct cable type? Either you should use a
regular 568-B straight-thru cable, or else you should use a full GE
crossover cable, which is wired like this:
1. white/orange -> white/green
2. orange/white -> green/white
3. white/green -> white/orange
4. blue/white -> brown/white
5. white/blue -> white/brown
6. green/white -> orange/white
7. white/brown -> white/blue
8. brown/white -> blue/white
Note that for a 100M cross-over, you only cross orange with green, but for
GE, you need to cross blue with brown too.
Even if you're sure about the cabling, it's no harm to test it out with a
decent cable tester. Maybe there's something strange going on with the UTP
termination plugs?
Cable length is only a problem where you use co-ax, as the co-axial cable
medium can encourage all sorts of strange effects (signal reflection,
timing problems, etc).
Nick
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