Split Pair

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 Question by Gladys Boeth posted 24 Jun 2002
 Split Pair
I would like to know what a "split pair" cable is? We make our own cables and a former employee made a split cable. Don't know how he intended to use, but before I make it into a straight cable I want to know what types of uses are there for a split pair. All the information I have talk about voice, this is a CAT5E cable.

Thank you,
 Answer by Dmitri Abaimov posted 27 Jun 2002
Dear Gladys ,

I would guess here that the cable you're talking about is the one that has two jacks on the end as oppose to the single jack as it is required by the cabling standards. Sometimes they do that to make use of the two pairs remaining from other two, taken by Ethernet application. I can imaging that 2nd (orange) and 3rd (green) pairs were used for data and 1st (blue) was used for voice. Alternatively, if the intention was to split between 2 data connections, it might be pairs 2-3 for one data and 1-4 for another data connection.

Please note that these kinds of split cable are non-standard, so there is practically now way to tell for sure how exactly the pairs were split.

Another thing to keep an eye on is the other end of the cable. If you are making a straight cable from this split one, make sure you remove the split adapter (or re-arrange the cross-connections) from the other end of the cable.

Dmitri Abaimov, RCDD

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