Converting STP cable

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 Question by Tom Lanman posted 27 Jun 2002
 Converting STP cable
We have some screened twisted-pair cable in a branch office that is being used for RS-232 serial coomunication. I want to modify some of the cables to support 10BaseT Ethernet, if that is possible. Can we make this 2-pair STP work as 10BaseT?

I'm trying to avoid pulling new cable through the suite. Our STP cable is one size larger than Cat 5; it's 22 AWG. The pairs won't fit inside the usual RJ-45 plug without stripping the plastic insulation off the strands. I went to Pacific Radio Electronics to buy a better size of RJ-45 jack for the task, but they said they don't have any and have never heard of such -- "there's only one size".

Any helpful information will be greatly appreciated, but is urgently needed as I'm am working under a deadline.

Tom L.
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 Answer by Dmitri Abaimov posted 30 Jun 2002
Dear Tom,

Usually RJ-45 jack will take from AWG 26 to AWG 22 wires. If the insulation doesn't fit, then it has to be stripped off for as little as possible. This solution is temporary as far as I understand, so this approach will work for a while. It will not work as a permanent solution because over time the copper will get corroded at the place of contact, and the contact will be gone.
Since you've also mentioned plug, I think it needs to be clarified that you have to install the wires at a jack, not trying to crimp a plug, which is really impossible.
Make sure that contacts #1,2,3 and 6 will be terminated at both ends since they are used for Ethernet connection.

It is not guaranteed that the solution will work on considerable distances due the the fact that the cable you are trying to utilize was designed for much smaller frequencies than required for 10Base-T.

Sincerely,
Dmitri Abaimov, RCDD

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