TELECOM Digest OnLine - Sorted: Re: Wiring Two Lines on One Jack

Re: Wiring Two Lines on One Jack

Carl Navarro (
Fri, 11 Mar 2005 17:03:52 GMT

On 10 Mar 2005 19:21:37 -0800, wrote:

> Hi,

> I would like to wire one jack for two lines. Here is the setup of the
> wires after opening the jack.

> The red screw terminal has two blue and 1 orange wires connected to
> it. The green screw terminal has 2 white/blue and 1 white/orange wire
> connected to it. I'm just curious as to why there are 3 wires
> connected per terminal.

> The yellow an black screw terminals are not connected to any
> wires. Now what should I do to be able to access a second line?

If you haven't already guessed, the blue pair in a cable is the first
line and the orange par is the second.

The reason for 3 wires is that one jack is feeding another one or two
jacks somewhere else in the building. If you carefully tag the 3
cables that go to the jack, you can remove one at a time until you
don't get dial tone, or remove them all and put them back one at a
time until you get dial tone. That is the feed pair to that jack and
if you search, you'll find that 2 or more other jacks are now dead.

The trick is to find the closest jack to the demarc and hope that it
is the one that feeds dial tone to the whole building. Get out your
toner and probe and start testing :-) or just do it by trial and

When you're finished, you'll bring the second dial tone into the
building on the orange pair and wire that orange pair to the
black/yellow wires on the jack. If you need to send that dial tone to
another location, you'll need to put 2 or 3 pairs down on every jack
just as they did with the first line.

I would guess that the reason for the orange pair is because the
previous tenant either had DSL, or a broken blue pair on that cable.

Carl Navarro

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