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Posted by Touch Tone Tommy on September 5, 2006, 2:27 am
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It's actually Pins 1/2 and 4/5, so take a dual surface jack, install 2
Cat-5 jacks, and use some scrap wire to go from the Wht/Blu pair of
one jack to the Wht/Org (568-B wiring pattern) of the other jack, and
vice-versa. Use a regular Cat-5 patch cord with this fixture, and if
you find that it solves any problems, rewire the actual jack for the
T1 and don't leave the adapter in service.
>>... But in talking with the McLeod tech he said I may need a T1
>>crossover cable to make the new T1 work...
>
>You won't be able to find one in a store, you'll have to make it, or
>change things around. You may be able to find one on eBay for CCNA's
>doing testing or the like.
>
>Most likely what he meant is that the tech might have reversed the
>pairs when they installed your new T1. They frequently don't check to
>see if their pair polarity is correct on their T-BRD sets when they
>test them. I know I've had to fix this sort of problem dozens of times
>when I've been onsite installing routers and such.
>
>A T1 is pined out on an RJ-45 to be receive on pins 1 & 2 and Transmit
>on pins 3 & 4. This is different pins than what Ethernet uses, so an
>ethernet cross-over won't work.
>
>You can make your own T1 cross-over cable by simply reversing pin 1
>and 3 and pin 2 and 4 end-to-end.
>
>Or, what is probably easier, is to go into the jack, most
>installer techs use a screw-down terminal jack, move the cable on pin1
>over to the one on pin3, and move the cable on pin2 over to pin4.
>
>Then it'll be wired correctly for the future instead of having a
>special cable that you'll forget about in the future.
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