atcomsystems.ca/forum Forums Other TDM Phone Systems 1A2 and Comkey Telephones & Systems curious about 1A2

Okay, you young wippersnappers! Move over or I'll hit you with my cane !!!

564 had common grounds for lamps 565 had a lead for every function.

More trivia ---- Twisted Pair, how do you get a ten button set to operate off of a 25 pair cable when it takes three pair for each C O button?

KLD

KLD- I tried explaining the 10 button set on 25 pairs to my younger techs...damn near scared them into a new line of work.

Heh? Wat'd ya say?

Man, Ken, we are aging by the minute! The 564/2564's made by ITT stayed with common grounds on lamps all the way to their end even though the Bell companies ditched them for 565/2565's across the board to standardize years earlier.

Really, the only reason for the 565/2565 was to incorporate the modified dial and the extra line cord conductors to support the 4A speakerphone. I think the only reason they separated the grounds on the 565/2565 was just a "why not make use of the extra pairs and stop paying for blown fuses on lamp reversals at the same time"! The 565/2565 had an 18 pair (yes, the yellow/blue and yellow/green pairs were skipped) line cord while the station cables were 25 pair. It didn't make any sense to come up with a 21 pair cable to accommodate the speakerphone, so they went with the obvious solution. I sure used a lot of those violet pairs!

You might be older'n me, but you ain't gonna outwit me on this'un!

By the way, I'll bet that 1A2 you are taking out was on that wall a whole lot longer than anything that replaces it will be! Agree? Shhh: Don't answer in front of the customer.

Now, let's go hit the front porch and take another nap...............


:sleep: :sleep:

txfoneman, this is a pic of the 464 set.


Just a guess, a ten button set only requires pairs for 9 buttons, one being a hold. From what I read; the A control is common grounded with the w/o, you just told me it is possible to have a common on the lights, is this where they are getting the extra conductors to run a 10 button on 25 pair?

Signed; young wippersnapper! :shrug:

By the way KLD,

I hope you are taking a picture of that system before you remove it on the weekend. I still haven't seen what the KSU looks like.

Very close, Twisted, but incorrect. The common control lead (A1) is the orange/white, not white/orange.

Also, Western Electric (AT&T) stopped using common grounds for the lamps on 10/20/30 button sets pretty early-on, but ITT (Cortelco) and Comdial (Stromberg-Carlson) continued to provide a copper strip that tied all of the lamp grounds together. I didn't work with Northern Telecom sets much (Logic 10 and 20), but the wiring was almost identical to Western Electric.

The 10 button phones pretty much used 2 1/2 pairs per line, one for the CO line T/R, one for the lamp (LG/L), and the half-pair for the "A" lead. Only one common lead ("A1") was required regardless of the number of buttons. With this arrangement, there were not many spare pairs to throw around for extra stuff, like transfer keys.

That's when we started stealing those lamp ground leads. It was amazing how much progress you could make by just having one extra single wire available to work with.

Man, you just lost the grand prize, a 2006 Hummer H2 and perfect 21-30 year-old women to fill every seat. You need to be more careful with your answers next time!

I am still impressed that you knew that much about a tried and true, yet dead technology.

If you want to see a 1A2 KSU, I will send you one if you pay for the postage.

Aaahhh, man, I could have used a hummer!!

Do I have the rest of the wiring right or are you going to make me wait for Ken to answer that?

I should take you up on that offer, wire up my 2 old sets to the 1A2 and learn a little something...........like why I'm lucky I got into the business at the point that I did maybe!!

Hummer, hummer? I thought were taking about old phone systems not well ah, the ah ... oh never mind, get your minds out of the gutter and tell them how much money you made on replacing burned out fuses and burned out bulbs in the keys, the clear plastic line buttons, not the piano keys.

How many of you could make an a lead on a s/l phone without looking at the wiring diagram in the box, are you that good?

True story, little old lady came in with her favorite old AT&T desk phone that didn't ring any longer and just had to replace one slate wire to go Harrring, harrrring, harrrrring.

I think you should wire a 20 station Stromberg Carlson while you are drinking and posting on Saturday.

And do you remember that GTE used similar equipment that they classified 10A2, not 1A2.

Remember what confidencers are and who was the ONE company that actually made one that worked.

WOW!!!! Now I really feel old! I started with uncle sam doing 1A1 key systems. There were just a couple of things that you didn't loose. Your butt, telephone test set and your wire wrap tool. All in that order. I thought that Christmas came when they gave us the "zip" gun. Whew...old age. I wish I had .10 for every lamp I changed. I sure changed a lot of them on the 5, 10 and 20 button sets. RBF, if you want to really blow them away, explain the diode matrix ringing to them! LOL

What is a confidencer?

I was doing some reading on the diode matrix on some old posts here. Sounds like it was a lot of fun when you were dealing with 60 phones and 10 lines all ringing differently. Was this matrix done right on a 66 block?