atcomsystems.ca/forum Forums Other TDM Phone Systems 1A2 and Comkey Telephones & Systems 400H line cards

I'm ok with the line lamps going dark if a call is answered on a partner phone. I mostly would like to be able to stop the ringers. I know an a lead control before the partner would do some wacky things because the 1a2 is/will be behind the partner. I could just forego common bell, but I don't really want to do that either. I suppose I'll either live with the carryover rings or figure something out. Either way, I'll start a new thread if it comes to that.

"Upon further review"...you don't need anything fancy. You just need a loop-current detector relay per line (with a break contact) or, if the loop detector doesn't have a break contact, an additional relay per line with a break contact.

Put a loop-detector in the line BEFORE the Partner, and use it to operate a relay that opens the CA lead in the Shoebox that feeds the ringer(s) for that line. It will "not exactly" be an A-lead, it will be just an "RCO" (ringer cut-off) lead, which stays open as long as the line is in use.

Case 1: incoming call answered by shoebox --

Call comes in, interrupter starts, call answered by 1A2 set. A-lead knocks down ringing and flashing lamp.

Case 2: incoming call answered by Partner --

Call comes in, interrupter starts, call answered by Partner set, lamp continues to flash for a few seconds, ringer is silenced immediately.

Sometimes I amaze myself.

Arthur, that is brilliant!

So, if I'm using common bell, and only say line 4 of the shoebox rings on incoming call, per partner programming, how would I silence common bell for the duration of the call without losing the bell if say an Icom call comes into the shoebox on say shoebox line one which is a different partner extension? Assuming my previous assertion that four partner extensions are connected to the four lines of the shoebox and only the extension connected to shoebox line four is programmed to ring on outside calls via the partner. This is getting convoluted, I know, but it seems to make sense to me.

C L I C K Sandman to the rescue.

Use this thingie. It detects loop current and has enough contacts to do what you need done.

It has convenient jacks for connection to the line and KSU, ***AND*** it has two sets of transfer contacts!!!

Everything you need in one small, easy to digest package! (And it won't upset your stomach!)

Just got off the phone with sandman. Part is ordered.

There is an output lead "CA" from each 400 card that sends interrupted local generator, through a relay contact, to the ring side (slate/yellow) of the ringer pair to the phones. If you loop the CA from line 1, line 2, line 3, etc, so that whenever any one, or more, of those cards detects ringing from the CO line, it will send local generator into the CA bus.

CA = "Common Audible" The CA leads, one per line card, appear along the side of the 66 block in the shoebox. They provide the hot side. You must also provide a RG (Ring Ground) on the yellow/slate wire to each ringer. These can be left multipled, as originally designed. You are just going to open the hot sides individually.

I suggest that you put a break contact of the Sandman device in series with the individual CA lead from the 400 card associated with the incoming CO line. You will not be interfering with all the CA leads, which would normally be strapped together. You will only be opening the wire that runs from the 400 card's CA output to the common bus. You could do this 4 times, with each relay opening an individual CA lead.

Clear?

As crystal! Bear in mind, this thing won't show up for a few days, and I've never seen one in person. This is definitely a learn as I go kind of thing. Again, a thousand and one thank you's.

Feel free to contact me on the telephone.

631 - SH9 - 0100 office

866 - SH9 - 0100 toll-free

1 + SH9 - 0100 C*NET

You can bet I will. There will no doubt come a time when I just can't figure something out and I'm on the verge of breaking expensive objects and sacrificing animals in the name of the 1A2 gods just because it "might" help. That's when your phone will ring.

Or I might just pick up my 2564 set to say "Thanks"

As a sage old man by the name of Silverman used to say "Given enough pairs and relays, you can do practically anything with 1A2."