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Stromberg carlson switchboard info please

Started by RB, August 01, 2020, 11:42:26 PM

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I found this board on ebay. for $40 shipped.
It has 3 toggle line switches, line lights, a nite buzzer, an OP phone, and a CT and NA switch.
it has a 24 wire bundle exiting the board, which has been cut.
It runs on 24vdc. when I connect red and black, the GREEN lite in the center lites and stays on.
I can lite the WHITE lites through the wire bundle. Seems to be getting the signal from some other device?
I cannot figure yet, how the RED lites get signal?
1. What is it?
2. where can I get a schematic for it?
I know what NA is, but what does CT stand for?