atcomsystems.ca/forum Forums General General Telephone & Systems Information 1a2 diode matrix

Just been wondering, is a diode ringing matrix just a 66 block with diodes stuck in it, or is there some other way of connecting them? What kind of diodes are used? Also what's the best way to connect a couple phones to one cable? Is there a ready made male to two female amphenol 25 pair connector or does one have to wire them up individually to a 66 block?

There were connectors called CPC adapters
its a gray plastic box with 3 connectors
the middle connector takes the cable to the room and outside connectors take the 2 phones.

I thought i saw at one time diode matrix
pre made that plugs on a 66 block

Its probably something someone on this board has in their basement or garage.

The diode matrix blocks were the 66 type but had more pins for the phones. Any diode will work as long as it will handle the ringing voltage, seems like they had a green ring around them, but that was long ago.

[This message has been edited by justbill (edited September 16, 2005).]

[This message has been edited by justbill (edited September 16, 2005).]

Ken.. I think CPC connectors were a pass thru -cable in phone out cable out to the next connector. PCP connectors were one 25 pair in on the center connection and two phones on the outer connectors...... CPC-cable-phone-cable....PCP phone-cable-phone. Have I gotten that old that i have forgotten this????

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Business Phone Systems

The diode matrix was created to permit different lines to ring on different key telephones, but to still be able to share variations of different lines' ringing.

The bridging adapter (gray/beige box that allows two 1A2 phones to plug into a single cable) was known as a "CPC" (connector-plug-connector). Just a simple duplex adapter that multiplies all 25 pairs to two separate connectors from a single cable.

A diode matrix consisted of 1N1004 (I think) connected with the band end pointed toward the ringing output (RC) from the line card. Every diode pointing toward the phone's ringer rang on that line. A matrix block consisted of a vertical row of common terminals (about five independent ones per block). There were also about five horizontal rows of common terminals. Any cross point between vertical and horizontal rows could be bridged by punching down a diode, effectively "programming" ringing for the line. Each CO line cards' ringing output lead would be connected to the vertical row of clips. The individual telephone ringers would be connected to the horizontal rows.

It sounds complicated, but in reality, it wasn't often that a matrix was required. Even if they were, there were usually only a few phones that actually needed to ring, so a 5 x 5 matrix block was usually enough.

Using a diode matrix also required that the ringer capacitor within the telephone set be bypassed. This involved terminals "A" and "K" on the network being shorted together. It was easiest to just move one wire to the other terminal to connect them together.

A matrix allowed "X" number of ringer outputs from line cards (RC) to be cross-connected with the ringers in the phones themselves. It is usually pretty simple to progam lines to ring on phones today, but with 1A2 it wasn't so easy.

If I needed lines 1-5 to ring at the receptionist, line 4 to ring at Joe's phone and lines 1-3 to ring at Sue's phone, then a matrix was definitely required. They really weren't too complicated if you kept your mind in order. Hard to do in our business.

NO, I SHOULDN'T KNOW THIS MUCH ABOUT THIS STUFF, I AM ONLY 44! It's just that I got into this industry at the age of twelve as a hobby, starting with 1A2. Please, you regulars don't give me a hard time about being old (yet)!


Dammit; Second edit: Yes, it was possible to use a 66M1-50 block and bridge across the clip rows with diodes instead of a bridging clip. You then cross connected the lines to the ringers that way. God, I am feeling old, but at least I still remember most of it.
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Ed
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How come there's always enough time to go back and fix it a second time?

[This message has been edited by ev607797 (edited September 16, 2005).]

[This message has been edited by ev607797 (edited September 16, 2005).]

Hell I thought a Diode Matrix was a movie.
But now I remember, diode matrix was really the
phone block from Hell!!!

We used to make our own diode blocks out of a 50 pair 66 block with either IN 4005 ITT diodes or IN 5061 GI diodes. It didnt matter which way the diodes went in as long as they were all in the same direction. And for multiple sets on a 25 pair cable there was a "Y" cord with 1 male plug branching out to two female plugs. You could join any number of Y cords together for more sets but it got quite messy looking

oh, the good old days!!!

That is language I have not heard in a long time!



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BIGDOG3c


PARALLEL TECHNOLOGIES INC.

WWW.ABUGSEYEVIEW.COM

Has anyone mentioned that when using a CPC the violet wiring in the sets needed to be isolated or you get some crazy lamp problems. And Ed I am not that old either. Some one just told me this once, I have never had to do this. Hah Hah

Mike

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| Business Telephones | Telephone Systems

Seems like that was only on the 10 button sets.