The fundamental concept of Clear-Com Partyline intercom is that all channels are terminated in one location, preferably at a main station or power supply. NOTE: There should be one, and ONLY one, termination for each channel in the system. The concept is to minimize impedence changes on the line when user stations are removed from or added to the line. An un-terminated line will cause excessive levels, possible oscillation of line drivers and squealing in the headsets. An intercom line ...