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

The 24v talk battery from those old 1a2 power supply's can come in handy for Valcom paging.

True, but limited capacity, and be sure to use the "A" (or is it "B") battery. The filtered one! And, there is the drawback of size/weight vs 'ampacity'. But, for 1 or 2 1030's, it'll "git 'er done"!
John C.

A battery is filtered for use on talk (intercom) circuits. B battery is unfiltered and for use on relays, etc. Most power supplies on 1A2 have only about 1/2 amp of A battery output, but at least two amps of B battery. Valcom units will work on A or B battery since they have built-in filtering.

That's a Northern Telecom QUJ 10A KSU. There were used until the early eighties, when Northern started coming our with their digital systems (Vantage).

These "QUN" cards were the line cards I believe, with QUN 10 C&D being for Touch Tone.

I used to be the local Storekeeper for Bell Canada.

There also were two smaller units for smaller applications, the QUJ 8A, and the mid range QUJ 9A KSU's.

Somewhere around here I still have a business installer's manual that my dad gave me with info on this old equipment. He used to be a PBX installer here.

He's still around and could probably answer some of your questions. Let me know if you need his email address.

The last QUJ that I found was about 4 years ago and it was working when I removed it.

Dave

Dave,
I have some of those QUN cards. I have the QUN 10 C and I also have the QUN 10 A in there as well. They are labelled as CO/PBX L.

I also have QUN 8 A which has on it I/C CONT and NSQ 4131 which has on it L1. I am sure all those prefix letters are a Canadian Northern Telecom thing.

I am interested in finding some more information out on those cards, so yes, I may be interested in chatting with your dad.

By the way, I have a Vantage KSU as well and a ton of different model phones for it!

brings back memories, such as the northern logics with the two line cord variations, old stepper intercoms,wire wrapping for moh, and such. i do remember the last itt 1a2, the 601 with electronic interrupter, and the resistor that would smoke if you tried to ring too many sets.

I found this thread with Google, as I've been trying to figure out what the Northern Electric NSQ4131-L1 card is. Now I see it is the card on the lower right of your pictures. Electrically, it is a 2 pole 10 position rotary stepper. There is no "off" position before the first contact, just 10 live contact positions which run through in sequence. There is a "home" or off-normal position sense switch stack at position 10.

But it has essentially zero logic -- almost all the stepper connections are brought out to the 40-pin connector.

In the context of the picture, it looks like it might have been part of a multi-link or large station intercom system, with multiples of this card in the intercom slots. These are very different pin-outs than the 400 and 401 cards.

TP -- Did you find any info in the Key System Manual about the intercom unit, and would you be willing to share a copy? Could you use more of them? TIA for any help. -- Alan

Why does he need lamps? You only need lamps when you're growing stuff in the base.... OH! Never mind, I don't want to know why! John C.

Alan, I actually loaned the book out to another tech that wanted to copy some of it. He is done with it but I haven't gone over to pick it back up.

I will get it an check back with you.