sundance-communications.com/forum Forums Other TDM Phone Systems 1A2 and Comkey Telephones & Systems Ring Cut Off

Hey guys! Long time no hablo! All's been well over here in the great white north, will be finished my course in two months, then onto the field!

I was wondering if I could bother you with a question?

As you guys already know, I have a keyset system setup in my home, but I have also non-keyset telephones connected.

The problem is that if my phones ring, and I pick up a non-keyset telephone, my keysets continue ringing for 2 to 3 rings after I pickup. I'm thinking it's because of a discharging capacitor in the KTU. I may of course be completely wrong.

Any way to work around this?

Many thanks in advance.

It's because the first ring starts the interupter and it won't see the off hook without having the SLT's go through the key system with A lead control. The interupter will still run a until it times out from not seeing anymore incoming ring. Nothing you can do without the control leads.

So because my SLT's don't have an A lead control, there's no way to "tell" the interrupter to stop?

Any way to use some kind of conjuction between black/yellow in SLT's with internal cabling of my home to send signal to interrupter?

Absolutely. You need to modify the SLTs for "A" lead control. Essentially what you do is free up a switchook contact (normal switchook operation is to open both Tip and Ring) and use that contact to switch ground (coming from the A1 lead) onto the A lead, thus controlling the card and the interruptor.

What kind of SLTs are you using? Give us a list with model numbers and we'll try to give you the right mod.

Some sets cannot be modified but for those sets there are external units that can be added on that perform the same function.

Sam

Great! Thanks Sam! I'm a little foggy at the moment to grasp the tech details (usually the 3rd cup of coffee will take care of that), but I'm getting the jist of it.

I'm using a combo of SLT's. A Cortelco 2500, an ITT 2500, and a Bell Canada cybiolink 8000.

The external units Sam mentions are called A-Lead adapters. They look a little like a DSL adapter. A search on this forum found the ones on Ebay to be poor so order them from a Telco supply if you choose to go that route.

The A-lead adapters are for line-status indication and ring-trip use only. They cannot be used to retrieve a call from HOLD, as has been discussed many times in the past.

The device you really need is a WE 18D KTU, which is made of unobtainium.

I don't remember the mod offhand (it's been a few years since I've done one ), but I'll try to look it up tonight.

There shouldn't be a problem modifying the 2500 sets, however I am unfamiliar with the Bell Canada cybiolink 8000 though - do you have a print for it? If it doesn't have a spare set of switchhook contacts then you will definitely need an A-lead adapter. Sandman used to carry them, and probably still does - but hold off before you spend any money, it might be nothing more then moving a couple of wires.

Sam

Arthur -

I'm going to have to test that. I have two SLT connections in the house on adapters - one is on a WE (or maybe AE) 6B KTU and the other (I think) is on a Crest A-Lead adapter. I thought I could take calls off hold with them.

It's so sad that I can no longer remember anything. :shrug:

Of all the things I've lost, I miss my mind the most.

And I might, just might, have an 18D KTU in the dreaded basement. A disco from the last remote hold job.

Sam