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#484514 - 04/11/07 04:59 PM Re: 556a PBX
EV607797 Offline

Moderator-Vertical, Vodavi, 1A2, Outside Wire

Registered: 01/21/05
Posts: 14568
Loc: Metropolitan Washington, DC (N...

Chances are that it is equipped for grounded ringing. This means that the system isn't expecting today's ring voltage on trunks across tip and ring. It's looking for ringing from the ring lead to ground. A very common situation back in the day.

Make sure that you have a good ground to the 555 and you might luck out. Also, make sure that tip and ring polarity on the trunk(s) is correct.
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#484515 - 04/13/07 05:16 AM Re: 556a PBX
samcorcione9111 Offline

Registered: 03/22/07
Posts: 33
Loc: Evanston IL
Could be. I am sick with a 101 degree fever. so I am staying in bed... I'll probably play with it next weekend.

Sam Corcione
President/Sr.System Specialist

#484516 - 04/14/07 09:56 AM Re: 556a PBX
Silent700 Offline

Registered: 03/20/07
Posts: 25
Loc: Prospect Heights, IL
Originally posted by carolinamw:
In that last picture, are all of the internal wires cut off at the jacks and lamps? or just down at the wooden block?
Not sure if you're talking about my 556a (in the pics linked in this thread's first post) or Sam's 555, but as for mine there is very little wiring remaining, and what there is has been clipped right at the terminals. There is that wooded punch block at the bottom with some wiring leading up and behind the line cards. No idea where that goes (yet smile
Vintage computing in the Chicago area:

#609756 - 04/17/17 06:58 PM Re: 556a PBX [Re: Silent700]
Ed Greenberg Offline

Registered: 04/17/17
Posts: 1
Loc: Upstate New York
I realize that this was a very old thread. I wonder if the original poster with the 556 is still around, or if there are any other 555/556 hobbyists around.

I just brought home a 556.

Ed Greenberg

#609757 - 04/17/17 07:57 PM Re: 556a PBX [Re: Silent700]
dexman Online   content
Spam Hunter

Registered: 12/21/05
Posts: 6964
Loc: Arlington, Massachusetts
welcome to Sundance.

The OP hasn't posted for about two years.

Having said that, there are a handful of members who are either retired Bell System employees or avid hobbyists who are very knowledgeable of 1A2 key systems. If you have specific questions, browse the existing topics to see if the questions have been previously asked.

If they haven't, feel free to open new topics and ask away.

We do ask that tacking onto old topics be avoided. New topics can be opened and links to old topics incorporated. smile

#609758 - 04/17/17 09:50 PM Re: 556a PBX [Re: Silent700]
EV607797 Offline

Moderator-Vertical, Vodavi, 1A2, Outside Wire

Registered: 01/21/05
Posts: 14568
Loc: Metropolitan Washington, DC (N...
Sam is quite alive and well, but he hasn't been here lately, as previously mentioned. He's quite active on a Facebook page that specializes in older Bell System products and discussion. I'll send you a link via private messaging to a page there.
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#609789 - 04/20/17 10:49 AM Re: 556a PBX [Re: Silent700]
Arthur P. Bloom Offline

Registered: 09/20/06
Posts: 3034
Loc: Shelter Island, New York
Yes, there are a lot of people who collect and operate old cord boards. Why not start a new topic and we can discuss them. We need to talk about your 556 in particular, so you can understand what it is and how it works. (It will probably be not what you expect.)
Arthur P. Bloom
"30 years of faithful service...15 years on hold"

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