Stryder:

Station Specialties is expressing the fact that there a zillion things that can be done with 1A2 equipment and he is right. It's just not a simple programming issue, nor just a phone system, but it requires that you roll up your shirt sleeves and do a lot more thinking than programming today's more modern systems.

There's not much that you can't do with 1A2, but it's not always easy. You have to be forward-thinking and plan your project around "what-if's" or "if-then" situations. It can be done, but you have to possess a lot of patience unless you have worked with it for years. No single book or Website teaches this system; you learn from the school of hard knocks.

You would need to start up a diode matrix to share intercom and common ringing. You probably don't want to get into that, but if you do, it can be done.

There's only one intercom unit that I can remember that offered two different voltage inputs to permit ringing and buzzers. Valcom made it, but I am not sure if they even make them anymore.

Condenser is another term for capacitor. There is one connected between terminals A and K on the network for ringer isolation. It really only needs to be bypassed if you decide to mess with a diode matrix in the future.

It appears that you have a good grasp of your situation, so for now it's great that you have something to work with. As always, feel free to check back when you are ready to move further into this.

Ed Vaughn, MBSWWYPBX