APPARATUS FOR INTERPRETING NUMERICALLY CODED PULSE GROUPINGS IN A LINE

摘要

An electrical supervisory signaling system employing a plurality of McCulloh-type pulse transmitters which are operable selectively to transmit over a line one or more like groups, or "rounds," of time-spaced, numerically coded pulses. Single-"round" and multiple-"round" transmissions are used to indicate different monitored conditions. Receiving these pulses in the system is an interpreter which, through examining the time spacings between successive pulses, both distinguishes the transmissions from the different transmitters, and indicates whether a transmission from a given transmitter contains one or more "rounds" of pulses.