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

Paul -

I have scanned about 15 pages of 1A (Flat spring relay) documents into a PDF file. I'm not sure how good it is going to be - I'm scanning from a bound book, not loose sheets of paper. The book is called "Key System Service Manual, Vol. II" It's about 500 or so pages of small print and schematics.

I'll try to do some 1A1 if this works. PM me with an email address and I'll send it over to you.

Sam

Many thanks Sam, very much appreciated.

PM sent.

Just some additional notes on line cards and general 1A2 goodness. Ed, you may find this of particular interest.

The Western Electric 400H (last of the 1A2 CO/PBX line cards) actually did have one relay. It was a tiny mercury-wetted beastie, though I don't recall what it was used to switch (gotta check my SD's to determine that).

I have had problems with 400H's, enough so that the 400G is pretty much the only one I use now. Most of said problems were related to incoming ring detection, and detecting the momentary CPC drop from the CO when a party on hold hung up.

It is my opinion that the 400G represented the last of the 'good' cards out of WECo.

I've had great results with the SAN/BAR 4200's. I still have a couple as spares. Also, I have the unique distinction of still owning a SAN/BAR 4201 FM receiver card. I actually bought the thing, at list price, brand-spanking new from a local supplier back in the late 70's.

Although I am using music-on-hold at the moment, I'm not using the SB cards to accomplish it. I have a wall-mounted receiver from Valcom, coupled to a pair of WECo 109B 'Audio-on-Hold' cards. I would add that the 109B's seem to be particularly rare in the 1A2 KTU world. I've not found any BSP on them, and ended up ordering the SD's from the Lucent CIC just to figure out how to hook them up!

On that note... I have a couple of other posts to make on other topics. Keep the peace(es).

Geez, it figures that you would have caught that! Yes, even the 400H had a reed relay to detect incoming ring current on the line. Man, I can't pass much of anything past you, Bruce!

I agree that the 400G was by far the most stable and reliable line card. There were too many revisions of the 400D and for some reason, our site situations always required a different revision. Sort of like Partner systems. Whatever you needed, you didn't have the correct revision.

I think that the only reason that the 400G went away was because dedicated phone equipment closets started to go away in the early 1980's. At that time, equipment had to start being installed with in the office space. The clicking of relays might have been objectionable, resulting in complaints. The 400H was virtually silent in operation.

Hey, I am just guessing.

Ed, hate to burst your bubble but, clicka, clicka, clicka. The sound of a mechanical interrupter. ITT601 had an electronic one. Did the shoebox W/E have a mechanical or electronic interrupter? And is my mind going to lala land or did Sanbar really come up with an electronic plug in for the mechanicals? John C. (Not Garand)

Man, everyone is out to beat me up! OK, I was referring to the card itself being quiet without having any mechanical relays. Yes, John, all WECO 1A2 and Comkey systems used mechanical interrupters. Their 6B "Dialog" advanced intercom system was sort of a PBX/intercom system hybrid that offered solid state ringing and lamp flash, but it was short-lived. Tone Commander's ML-8000 beat it up price-wise, so I doubt that the 6B lasted more than five years.

I know for sure that ITT's 601 had a solid-state interrupter and that was the only option. I bought enough of them to know. These cards had a very high failure rate due to heat issues.

The San/Bar one fit into a dedicated slot on their own 15-line panel and wasn't interchangeable with other systems, but it was definitely solid state. I am pretty sure that Plant Equipment made a solid state interrupter as well for their panels, but I never worked with them.

I guess they wouldn't have been happy with a Strowger PBX rack occupying one corner of the office then?

Uh, no....I seriously doubt it Paul!

I have the big page manual on the Horizon. It's in a three ring notebook. At that time, it was the The technicians go to. The Station practices version was
not as easy to understand.

If anyone needs old spring relay specs or anything dating back to a 701. I have the various manuals.

I most likely can dig up some old cord board stuff that can give a schismatic of reference.

Just a thought

Ed, your comment about the 601 electronic interrupter dying, brought back memories. We had 5-6 in stock, just so we could do the old swap and send for repair. Those things were about as reliable as Fiero headlight mechanisms! And who got stuck changing resistors in ITT701 station cards? We actually had 2 systems we never installed because we used the station cards for swapouts. We were 1 of the few interconnects that were allowed to change out the resistors, after the 1st couple of months. Apperently, a lot of PCB's were destroyed with soldering guns! We clipped out the resistors and then removed the leftover leads, instead of trying to salvage the resistors. Like, what are you going to do with the old ones, start a used resistor sales depot? And of course, we had bench component level repair for Code-A-Phones, so we knew how to R and R components. John C. (Not Garand)