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Wired intercom circuit.


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I'm looking to work on a Metro/Granite/Stonewood GS-CCU4 base station.

This is a little unusual as it's a single unit system with 4 headset ports and no additional units (other than headset extension cables).


Does anyone happen to have any technical info, circuit diagram would be ideal.

I've tried contacting Granite but it appears they no longer exist.

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