sundance-communications.com/forum Forums Other TDM Phone Systems 1A2 and Comkey Telephones & Systems Cortelco 1A2 Phone to 3 line modern telephone system

Hey all,

after years of trying to get such a 'stylish' looking telephone as seen in those old TV series, I finally got one...

It was rather cheap, but it was such a I think 1A2 kind of phone with 5 lines, a 50 pin centronics plug and more wires inside than most modern computers got...
After reading in this really great bulletin board, I finally got it working - at least partly...

My two wires connected to 1R and 1T, selected Line one and I gotta dialtone - sweet! Connecting the ringer to the same terminals it even rings when I get a call - fantastic.

But I still want some more..;-)

I got a telephone system from AVM - a common german manufacturer of VoIP capable systems, outside germany probably completely unknown, but anyway.
This system puts out (besides several ISDN ports) three a/b terminals for analogue phones.

Having a five-line-phone it shouldn't be too hard to get line one to the first line-key on the phone, the second line to the second-key and the third to the third line key.

Without ringing, it's no problem, I only have to use the appropriate terminals 2R/2T and 3R/3T...

Is it possible to signal the ringing on all three lines to the ringer, or even better to light up the appropriate LED if a call is coming in? (So, it rings only for line 1, but for line 2 or 3 the LED is powered up?)

That really would be great....

Thanks a lot in advance!

BTW: Because i waited so long for such a phone, I wasn't really picky about the colour - but who ever wanted to have a kindof pinkish telephone?


Cheers,

Prefect

Prefect -

Signalling on all three lines - whether audible or visual will require additional equipment - A KSU (Key Service Unit).

I'm not sure what type of set you have. Some of the Cortelco (ITT) sets had lamps and a few had LEDs - in either case they ran on 10V AC. Ringing voltage was 90V AC so applying the ringing current would burn them out. Also the resistance of the lamp would hold up the line.

They used to make Neon lamps for visual indication of ringing. They usually came in a little hexagonal shaped box called a "beehive" (about 2" in diameter and maybe 3" high as I recall) but it was possible to remove the lamps and remotely mount them (don't forget the resistor if you do!). You would need one unit for each line. Mike Sandman sells them on his web site (www.sandman.com - page 46 of his catalog) They run between $9 & $12 each, depending on which model you want. or it's possible that someone here on the site has a couple to sell. You could ask.

I hope this helps. If I wasn't clear enough - please write again and we'll try to help.

Cheers,

Sam

PS. The pink color was the phone company's version of beige. I never understood why they called it that, but it was very popular.

Hi Silversam,

thanks a lot for your answer. I didn't thought it was so difficult to implement that...

I've got the version with the LEDs instead of the lamps. Do you know how I connect the LEDs on the internal terminal, maybe I can tinker a ringer2led converter with a couple of transistors. Maybe I'll have to sleep over that;-)


[/QUOTE]

BEIGE? They actually called that color beige? Someone in marketing was obviously color-blind..;-)

Thanks a lot for you answer!

Cheers,

Prefect

Prefect -

The lamp leads are:
For line 1 they are White/Green & Green/White
For line 2 they are Red/Blue & Blue/Red
For Line 3 they are Red/Brown & Brown/Red
For line 4 Black/Orange & Orange/Black
For Line 5 Black/Slate & Slate/Black

Dial Tone Leads are:
For line 1 they are White/Blue & Blue/White
For line 2 they are White/Brown & Brown/White
For Line 3 they are Red/Orange & Orange/Red
For line 4 Red/Slate & Slate/Red
For Line 5 Black/Green & Green/Black

Good Luck!

Yes, they really did call it beige.

Sam

Not 'just' beige, but, Sand Beige! When you see the WHOLE name it makes a little more sense, but not much! John C. (Not Garand)

A friend duped that color "prosthetic leg," and I can't do any better than that. Of course, that refers to 1970s prosthetics, contemporary with the phones

OK, but how many phone techs can pronounce 'prosthetics' correctly. Wait a minute, I just slammed me! How do you delete this stuff? John C. (Not Garand)

You can make this work. "I've got the version with the LEDs instead of the lamps." It does not matter but if you are not careful you will burn out the led's in no time.

Think in terms of common audible/visual in which you have. Selective line ring audible requires a ring generator. If you just want the lamps to flash on an incoming ring You will also need to wire the A-lead control to some a voltage on the power supply.
My point is you can make the lamp flash instead of a ring. If this was your question. I would not use more than 12volts off the power supply for an Led.

Maybe I over read into the question. In any event I think you can make it work.

1a2 is like a train set with all it's gates and lights and noises that you need to build.