DEVICE FOR TRANSMISSION AND RECEPTION OF INFORMATION BY USER Russian patent published in 2000 - IPC

FIELD: communication equipment. SUBSTANCE: device has user set, which include emergency call button, autonomous power supply, modulator, transmitter, telephone, microphone, amplification unit, keypad, signal generator, receiver, optical system and switch. Distributing relay of system includes duplex converter of optical signals, modulator, demodulator of emergency call signal, demodulator of telephone signals, emergency call network interface unit, and telephone network interface unit. EFFECT: elimination of public pay telephones, increased efficiency of delivery information about crime possibility or effective crime to police, increased functional capabilities, decreased cost. 2 cl, 2 dwg