100BaseT Splitter

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 Question by Walentyn Sebastian posted 13 Feb 2001
 100BaseT Splitter
I have read your Usenet answer to the subject question. However, I found the following intriguing blurb in a different Usenet discussion:

"Yes, it is possible. ... AMP Communications Outlet system has the solution. ... a dual RJ 45 outlet with pins 12/36 active on both jacks."

I reviewed the AMP catalog on line but cannot figure it out. All I need is one or two such set ups.

Is it really doable?

If so, how?

Thank you!

Walentyn
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 Answer by Dmitri Abaimov posted 14 Feb 2001
Dear Walentin,

It is doable either with a special kind of outlet or a splitter attached to just the normal outlet instead of regular attachment cord.

However:

To make the system work you'll need to put two Ethernet signals on all four pairs of one cable. That's why your choice of patch panels is limited to only 110-type blocks, since they allow every pair to be routed separately. This is not about 110-type connections like everybody says for their modular (RJ45) patch panels. This is about 110-type wiring blocks (see example here).
Besides, I would never hard-wire one 4-pair cable onto two separate RJ45 jacks. Who knows, maybe just a year after you'll need all four pairs here (Gigabit Ethernet and such). That's why all non-standard wiring layouts are made outside the cabling system (specially made adapter replaces connection cord or/and equipment cord).

How it's done?
On both ends of the cable run pairs #2 and #3 connect to the same pairs of one RJ45 jack and pairs #1 and #4 connect to pairs #2 and #3 of the second RJ45 jack.

Again, I do not recommend to use hard-wired solution like this AMP/Tyco made specialty outlet.

Sincerely,
Dmitri Abaimov, RCDD

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