SIGNALING DEVICE Russian patent published in 1995 - IPC

FIELD: communication engineering. SUBSTANCE: device has two-wire communication line connected through band filters to radio-pulse generator, receive-monitor console, sine-voltage generator. Line is also connected to inputs, outputs, and power inputs of N subscriber stations. Radio-pulse generator polls subscriber stations. Supply voltage is passed from sine-voltage generator to subscriber station. Polling signals of subscriber station go through noise-suppression unit to radio-pulse-to-video-pulse converter. Response delay element in subscriber station counts out definite number of video pulses and enable operation of message-code shaping unit which shapes station status code in case subscriber status signal is applied to its second input. Subscriber station response in the form of radio pulses arrives at receive-monitor console. Subscriber station also incorporates polling signal identification unit and subscriber polling time space shaper. EFFECT: improved noise immunity, enlarged number of subscriber stations without reducing validity of polling results. 8 cl, 8 dwg