rotary phone connection for DSL

January 22, 2010 at 09:45:54
Specs: Macintosh
I am trying to hook up an old-rotary phone, but I need the
DSL filter, as well. Since this phone does not use the
standard jack, I am having trouble finding a connector
block that uses screws so that I can connect the wires
from the phone to a connector box and the DSL filter to
that box and then into the wall.

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January 22, 2010 at 10:05:02
I don't think a rotary phone is going to work on a DSL line. I am not sure about that though.

As far as the connector on the end of the phone wires why not just put a modular plug on the end. If you have an extra phone cable laying around you could cut of one end, strip the wires and either open the phone and put the correct wires under the internal screws or just splice it on to the end of the existing cable.

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January 22, 2010 at 10:09:36
Thank you. That's what I was going to do, but thought a
connector box with the screws would be cleaner. I'll just go with
that though. Thanks!

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January 22, 2010 at 10:16:56
I would be surprised if you have DSL services and phone service that supports rotary dialling.

-Ryan Adams

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January 22, 2010 at 10:26:52
I just need to connect the phone to the DSL filter for the
landline connection. It works!

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January 22, 2010 at 11:09:43
Whether it works or not has little to do with DSL. It all depends if your phone company has the necessary equipment to recognise pulse dialing instead of the tone dialing of a modern phone. The two co-existed for a while but whether they still do is another matter. Incoming calls wont make any difference.

All you need do after the is to connect the DSL filter in-line the with incoming phone cable. it should be relativity easy to fit an RG11 plug onto the end of the telephone cable.


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January 22, 2010 at 11:44:04
I'm in Canada.
I just tried a rotary phone - it still works fine, for a Telus line. I stopped using it only because sometimes you need to press buttons that produce a tone, e.g. when accessing customer service

What I did with that phone is open it up, disconnect the old cord, and install one with a modern phone plug on it.
Only two connections to wires are needed. The modern plug is usually clear - you can see which colors connect to the two contacts. Chop off one end of the modern cord, and connect those two colors of wires to the phone.

You use a 2 (or more) to 1 multiple phone line connector to connect to the phone line before or at the ADSL modem phone line connection (e.g. two female to 1 male, plug it into the DSL modem) , then plug in a DSL filter between that and the line to the phone.

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January 22, 2010 at 11:45:46
You may need more than two wires connected to get the phone to ring.

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January 22, 2010 at 11:51:30
"You may need more than two wires connected to get the phone to ring."

You only need two.

The residential cords have 4 wires but it's only essential to connect two. Take a look at the clear plug - for most phone cords, except at some businesses where they have call holding available on phones, or two lines on one phone (and 4 or 6 wires/contacts) , there are only two contacts, two wires connected to them ( or 4 contacts, two wires connected to the center two contacts).

If there are more than two connected on the original cord inside the phone, let me know, and I'll look inside my phone to see what must be connected. In North America, the the colors are often labelled beside the connection - B(lack), G(reen), Y(ellow), R(ed). If the wires in the plug are wired up and colored a standard way, you simply connect the proper color to the properly labelled connection (appears to be red and green, standard, from several cords I looked at) .

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January 22, 2010 at 12:09:12
DSL is a no dial system so Pulse Dial (Rotary Phone) does not affect DSL. It connects directly to the ATM on a different band (which allows you to be online while talking on the phone) which is susceptible to people talking on a phone and can be heard as strange harmonics by the person talking on the phone, hens the filters you need for the phone.

In short, it is not dial up so how your phone is dialed makes no difference. Personally, I would just pay the extra .25 cents a month to have Tone Dial added to my line.

P.S. DSL only needs two wires. You only need four wires if you need to add another Line Card to your NID so that you can have two numbers.

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January 22, 2010 at 15:19:14
I know DSL only needs two wires. They do need to be connected using the correct polarity though.

That said, I remember back when all we had were rotary phones with the old fashioned ringers in them. They did require an extra wire in order to ring. Usually also had a 16V transformer in the house somewhere to help power the Bell system.

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January 22, 2010 at 15:30:22
Ya that was back when they where not sending D.C. power on the lines. They do now and I think the voltages are the same but it does not matter because I belive the connectors in the DSL modem use transformer couplers which do not pass the D.C. voltage only the A.C. signal, so it should be safe.

The biggest problem is going to be as said above if the phone company has the proper ATM systems installed at the CO. If they don't then you are not going to get DSL.

The polarity (Tip - Green Wire and Ring - Red Wire) is important but if it was not connect right then the phone would not work.

You are right that some high speed systems did need 4 lines. I believe the old ISDN crap use to use 2 pairs because it was essentially two 56K modems.

P.S. Some more useless facts. They use to run the Transformer power on the Ring line because it was D.C. voltage it could carry both signal and power. They would however wire the yellow to ground probably to provide a ground fault for the extra power for the ringer. If this is the case just make sure you only use a single pair phone wire for your DSL modem instead of a 2 pair.

Check this out...

P.S.S. I use to be an DSL tech for AT&T and a HSI tech for Cox Communications.

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