atcomsystems.ca/forum Forums Other TDM Phone Systems 1A2 and Comkey Telephones & Systems Interesting service call today.

As a test, I switched the AT&T 962 telephone in our kitchen from tone to pulse and the Tellabs converter box used for FiOS service had no problems with it.

The customer bit the hook for FIOS and it didn't work. My assumption is that a true mechanical PBX that relies upon precise trunk voltages and supervision didn't like that silly 32 volt stuff.

They broke things in the process of trying to install it, hence the reason that I was there at all.

This customer came via a referral from Verizon in their desperate attempt to get things put back to the way they were before the FIOS thugs showed up.

I thought the Tellabs and Alcatel/Lucent ONT's provided a true 48 volt loop-start line.

But, I have yet to get my mitts on a technical manual for any of these units...

Does anybody feel like measuring the loop voltage and current on their FiOS ONT provided line? The results would be very interesting [this same subject keeps coming up on other forums as well].

Jim
**************************************************
Speaking from a secure undisclosed location.

The Tellabs unit in the basement puts out 48.65V [idle] and has not presented any problems for my Partner ACS (yes....I know that the Partner is a different animal). I'll try to measure the current as time allows.

some clairifcation please: you say this was a 750 PBX with 20 stations. Does that mean there was no KSU but a switchboard instead? Are the multiline 3xx style phones designed for 1A2 or do they take 1A or 1A1? Do the ones with the lucite buttons light up light the ones on the 256x do? Does it have A leads etc.? thanks

I will offer some info, not to step on Ed's thread. I'm sure he'll weigh in with some good info and correct me if my memory is faulty.

The 750 PBX is a small (3 by 20) crossbar exchange that has relays to operate the stations. There is no separate KSU.

The stations are not wired like standard 1A or 1A1 sets. They have very skinny mounting cords, and use a control lead per button, and can have a button for 3 CO lines and 2 intercom lines. The originals had no lamps, and visual indicators were mounted on the wall or the desk near the phones, so that users could see what lines were ringing or in use.

The 6-button sets used were the 462 (no lamps) and the 466 (with lamps.)

Arthur, you never fail to impress me with your knowledge.

Sam

Thanks, but one unanswered question, is this a 1A or 1A1 or do these terms even apply to this set-up?

Here's how I answered the question:

So, the answers are "NO" "NO" and "NO."

Every time that I re-read this post, I start to drool.

To paraphrase my two year old nephew, I WANNA!

Best,

Joe