Miswired Cable Works?
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Posted by Michael Quinlan on May 10, 2005, 8:17 am
Please log in for more thread options I went to new customer's office yesterday to identify and label the data cabling installed (but never used) by the previous occupant. EVERY cable was miswired, with ALL pairs reversed at the patch panel. The problem was easy enough to identify and correct, however, I'm baffeled by the fact that the (5) PCs they had already connected using the installed cabling were working! Out of curiosity, I check some (but not all) of the patch cables they were using, and they were all passed a wiremap test. I know that current hardware will detect and compensate for straight-through and cross-over wiring, but I've never heard of auto-correcting for reversed pairs. Anyone got an explaination for this one!? | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by James Knott on May 10, 2005, 2:10 pm
Please log in for more thread options Michael Quinlan wrote: What do you mean by "reversed pairs", if not cross over? It doesn't matter what colour the wires are, so long as proper pairing is maintained. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Bob Dozier on May 10, 2005, 3:33 pm
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My guess is that it worked because it was punched down as 568A and he 'saw' the colors as 568B. As long as it is 568A or 568B at each end, it will work. Just my 2 cents. ...Bob > Michael Quinlan wrote:
> > > I know that current hardware will detect and compensate for
> > straight-through and cross-over wiring, but I've never heard of > > auto-correcting for reversed pairs. > > > > Anyone got an explaination for this one!? >
matter
> What do you mean by "reversed pairs", if not cross over? It doesn't > what colour the wires are, so long as proper pairing is maintained.
> | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by David Lesher on May 11, 2005, 4:02 am
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>What do you mean by "reversed pairs", if not cross over? It doesn't matter
>what colour the wires are, so long as proper pairing is maintained. At one end, the blue-white is punched down where the white-blue should be and vice versa. -- A host is a host from coast to coast.................wb8foz@nrk.com & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Touch Tone Tommy on May 11, 2005, 1:34 am
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On Wed, 11 May 2005 01:02:30 +0000 (UTC), David Lesher >
> >>What do you mean by "reversed pairs", if not cross over? It doesn't matter
>>what colour the wires are, so long as proper pairing is maintained. >
>At one end, the blue-white is punched down where the white-blue >should be and vice versa. I've seen it done - one customer had the jacks wired properly, but polarity of every pair was reversed at the patch panel. Must have had two people working at each end when they terminated the jacks and backboard. Worked fine for data, totally choked when they needed to use a data run for another Legend MLX telephone. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
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> straight-through and cross-over wiring, but I've never heard of
> auto-correcting for reversed pairs.
>
> Anyone got an explaination for this one!?