atcomsystems.ca/forum Forums Other TDM Phone Systems 1A2 and Comkey Telephones & Systems 1a2 system

Welcome to the board. You might try the Buy/Sell category first and see what comes up.
Bill

Where is the Buy/Sell category located specifically on this site? Looking to buy parts for my 1A2 system.

Toward the bottom under "member forums" along with Hall of Shame and Phone Booth

There is a way to put music on hold on 1a2 without any special card. I forgot how it was done and removed my test shoebox some time ago.. I do remeber someone making a card with speed dial and toll restriction and music on hold for 1a2 but that was over 10 years ago.

Those cards were made by San/Bar Corporation. It doesn't appear that the company is around anymore.

Wasn't the MOH card a 403? I think we still have one @ work, I'll check monday. If you don't use the 403 (or whatever it is) then everyone on hold is on a BGM conference call, which usually is NOT a good thing. The card provides 6(?) isolated outputs to stop the cross chatting.
Way back when in KCMO the time-and-temp number had this little quirk. For about 5 seconds at the end, you could holler at all the other callers and if you were stubborn/stupid enough, you could carry on a packeted conversation. I never had that much time on my hands, but we all have or had friends that do or did!
John C.

John:

Yes, the K403A was PART of providing MOH on a 1A2 systems. This card was just a bank of 1:1 transformers, etc. with diodes and capacitors to provide separate isolated MOH sources for each K400E line card. The actual MOH source was hard-wired wired to this card and then it was fed out on individual pairs to each of the seven line cards it supported, and they needed to be K400E.

BUT the K403A required an unwired card slot that had each output pair wire wrapped to pins 3 and 18 or each line card slot. This IS NOT a plug-in solution! Plugging this card into a standard slot in a KSU will certainly burn up many of these transformers.

The original poster is using San/Bar 4200-200 cards, indicating that parallel-connected MOH input is acceptable. They don't have the same kind of setup at all with regard to the use of a K403A.

Memory is fuzzy but how about the 400 H card? I used the San Bars a long time ago but don't remember the -200.

Didn't they (San Bar)make a plug-in ICM?

Ken, I thought the same thing as well. I went in the warehouse and looked at 400D, E, G and H cards. Only ITT's 400E had anything physically connected to pins 3 and 18. San/Bar's cards also use pins 3 and 18 for music source input.

Using the other cards requires a completely different wiring/arrangement. Since the original poster has indicated that he's not familiar with the system, I sure don't think that an upgrade to the Western Electric wiring will be possible. We are going to need a true plug and play card in this situation for sure.

Ok - Sorry to open an old post - but I am installing a 551C - with 4 400H line cards and ring generator. I will be attaching various Western Electric phones - some dial, some push button, desk and wall - all 6 button. I am going to use all 4 CO Lines - and NO Intercom. I desire to have all 4 lines ring on each phone.

So, from what I gathered, the first 12 pairs are punched down for lines 1 thru 4. I would then Strap all 4 CA terminals and attach the Slate/Yellow (Pair 20) to the "strapped" CA pins and the Yellow/Slate to any of the B1 terminals to provide ring at each phone for any of the 4 lines. I also would attached the ring generator to the RG/RB terminals on the 551C.

Are there any other connections I am missing and am I correct on the above???

I am also in need of four A/A1 controllers to allow the use of single line devices off the 1A2 and have it trip the line light.

Any help is sure appreciated!

Ron