sundance-communications.com/forum Forums Other TDM Phone Systems 1A2 and Comkey Telephones & Systems Help with 91B connecting block

OK, thanks to all who responded. Give me a week or two and I will try your suggestions. On the other hand, if I wanted to use a paging system using 760 speakers and a 149 B connecting block, would that be possible? Also the terminals on the 149B do not make sense to me: e.g. two 1As, one 1B, one 2B, a 2A, a V, a BL, an 8G, etc. Is there a BSP for what these terminals correspond to?
Or how to hook up different devices to these terminals?

The reason you have two of many leads is you've got one from the female jack and one from the male jack. Sometimes you've got to tie them together to get the result you want.

Follow the tracings and you'll see.

What Ed said is on the money. Wire T&R to spare Violet leads and you're in business.

Sam

I'm glad you mentioned that, Sam. I looked at the schematic for the 149 series and it turns out that most yellow leads pass through with taps at the block. Most violet leads are in/out, meaning that all of the pairs must be bridged through to carry them to the set.

Way to go, Ed!

Sam

I seem to recall some 4A speakerphone connections have something to do with violet leads, and I currently have a key panel phone with built in Type 3 speakerphone that required some extra wiring although I am not sure where those extra wires went off the top of my head. I think it was some connections between the Model 55 control unit and a 66-block.? But could anything like this interfere with what I am trying to do?

Here is a link to the various wiring schematics for the 4A speakerphone

also BSP 512-730-400,

and finally BSP 512-710-405.

You can do what you need to do very simply with off-the-shelf items.

One "CPC" bridging adapter. It has one amphenol plug (male), and two amphenol connectors (female.)

click

Plug the running cable into the the male plug. Plug the phone into one of the female connectors.

Plug an amphenol-to-modular adapter (aka "harmonica") into the remaining female connector. The harmonica brings out all the leads of the running cable in groups of 1, 2, 4, or 6 pairs, depending upon the design of the harmonica.

Google "amphenol harmonica" and you will see a plethora of them, in various configurations.

Example; click

If the form factor of the harmonica prevents a fit into the CPC, use a short (2-foot) double-ended 25-pair cable.

That does sound easy Arthur. However, digging through some old stuff today, I found two different connectors from that great electronics brand, Archer Electronics, and will probably use one or both of them. They both fit between the male and female plug and the one has a line 1 RJ11 port. The other one is about the same size but it has ports for lines 1, 2, 3, and 4.

Thanks, Prof. Shadow. I will look at them as soon as I can but it may be a moot point now if you see my latest post.