I need to wire a DSL filter with a modular jack and plug into a phone
line without a modular jack/plug. I figured I'd cut the plug off the
DSL filter and wire those into the phone line. However, the colors of
the wires in the DSL filter are black, red, green, and yellow and I
think the phone line is in pairs with different colors.
How should this be wired in to the phone line?
Is there a better way to do it? (I went by Radio Shack and they
didn't have any modular jacks and plugs designed to be wired in this
Does the phone line end in the old 4 prong outlet?
Yes? Buy a converter.
No Google how phone lines work.
Most old lines only use two wires for signals. Other two are not used
or are for power to the lights on old phones.
As per the other replies.....
telephone color coding for the last 40+ years
red & green .......line 1
black & yellow ......line 2
my last wired phine work ~2005 polarity did matter, so if you try
red & green one way and oyur phone doenst work; swap them
sounds to me like the DSL filter is set up to service two lines
I haven't seen a new hard-wired single-line phone in 20 years. Is there
maybe a sliding or rotating cover on the wall outlet that is covering up
the plug on the end of the cord? Post a picture of this phone and the
wall plate someplace, with a link back here, please. A picture is worth
1000 words, etc. And even assuming the wall end is hard-wired, is the
end on the phone detachable? You can always use a double-ended rj11
block (used to hook 2 wall cords together) to connect the DSL filter
in-line, and plug the short cord into that.
BTW, forget radio shack. Their selection has purely gone to hell last
few years. Try Lowes, HD, Menards, or similar. The parts you need are
out there, at cheaper prices than RS. Too bad you aren't local. I'm 99%
certain I could solve your problem out of my junk box.
It is probably hung off 2 screws or studs in t-shape holes on the back.
Push up hard on the bottom end, and it will come loose, and there you
will find either a Ma Bell style wall phone plate, or a special
baseplate that came with the phone. There will probably be a modular
jack in the base plate, and the phone either snaps into the jack, or has
a short jumper cord with modular connectors where you can add a DSL
filter in-line. (It would hang down in a loop below the phone, unless
you can tuck it in the wall panel somehow.) I gotta give points to the
installer- that is an innovative use of a cheap kitchen phone, and it
took some fussing to get it to set flat like that. Exactly where were
planning on splicing the DSL filter in? It won't work on the handset
cord, if there are any electronics in the base. Or were you going to do
it where the wire feeds into the elevator shaft? (In which case, an
inline surface-mount jack and screw-to-rj11 adapter would let you plug
the filter in.)
Having said that, that doesn't really look like a commercial-grade
elevator emergency phone, if your local code people or insurance carrier
cares. If there is only one POTS line into the building, it should
probably be on a dedicated wire all the way back to the demarc, and
plugged into a 'line seizure' block like an alarm autodialer uses. If
somebody needs to call out on that phone, and they are the only one
there, it would suck if one of the other phones was off the hook.
I would do it differently, but to answer your question.
Red and green are the primary phone lines. Your existing line has 2 wires.
Connect one to red and one to green. If the phone rings AND you can call
out everything is fine. If not switch the two wires.
Reason: most newer phones can handle reversed polarity, some older phones
What is a better way?
What I have done is cut the modular plug off the filter and stripped
the red and green wires. Then I took a wall-to-phone cord (I have
plenty of those) and cut off a plug with a few inches of wire. I
tried to strip the red and green wires but they are so tiny I can't
My plan was to plug the plug into the filter jack, then I could put
that inline in the phone cable.
What I chose to do was split the incoming phone line at the entry point to
the basement. Using a system of modern modular jacks I ran the unfiltered
source to the modem and used one DSL filter for the rest of the house.
Next person can filter that line if they want to simply by adding another
As for your striping problem a match or lighter works well for burning the
insulation off the wires which can then be trimmed if you burn to much.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.