Manual telephone exchange the f 36 board has two ports one is connected to the subscriber while the other one is connected to the exchange end each subscriber which is connected to the exchange has a led on the control penal of the exchange with a female feeder. A manual telephone exchange cbs2 i couldnt have written this on the switchboard each subscriber appears as a jack which is connected to the subscribers telephone and an indicator to show when the telephone is in use each subscriber had one as did each incoming junction a junction was a circuit connecting to a neighbouring
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