atcomsystems.ca/forum Forums Other TDM Phone Systems 1A2 and Comkey Telephones & Systems Does anyone have an ITT 601A KSU in use?

We are discussing a 401A/B manual intercom card; a simple private talk path using button/buzzer signaling.

The discussion is that the 401 series of cards lacks any intelligence, as in deciphering tone or pulse dialing.

Yes, if you want to split hairs, you can use the CO Tip/Ring of the standard 400 card to provide access to an external product made by other manufacturers, but most do not require a 400-type line circuit in order to do this.

So to make it functional you would have to have a separate paging or signaling system to let someone know you wanted to talk to them on the intercom?


I'm trying to figure out what you need to accomplish? loudspeaker paging and station signaling or both?

The Intercom card is the way to go. Only because it has a voice coil built in. But you don't really need it. It depends on the application.


You need to know first that you will have to unscrew the pin on one of The chosen Buttons for the signal feature. This is for starters. No programing involved

You can build both. One button held for page and one button to signal intercom buzz or even page. Or even dial access to both with a Melco. The later option is a bit more expensive based on todays technology. Still you can do both if you have two extra line buttons on a 2564 set?

If you have 10 buttons it's even better.

I have built what I think you are trying to do.


So, if I pull two pins from two line buttons and wire it correctly to a secondary relay source I created fun and games with 1a2?


Email me for help.