Is this a solid state interrupter? I've heard that 118 ring generators are made of unobtainium these days, but it is way too many interface pairs for a ring generator here.
MCT66 is a dual channel optocoupler, so can be a lamp extender (but then I don't see any high power MOSFET to drive the lamps) or a line ringing detector. Anyway I ran out of my guesses.
Last edited by RedBul; 10/28/18 06:24 AM.
