Card calling telephone system

Details Card calling telephone system Card calling telephone system

H - Electricity

04

M

354/35, 379/74

H04M 17/00 (2006.01)

Patent

CA 1230436

- 10 - CARD CALLING TELEPHONE SYSTEM Abstract A card calling telephone system in which information is transformed bidirectionally between the card and the telephone by way of optical pulses. To this end, the card includes a photovoltaic cell to be illuminated by the telephone for powering the card's electronics, a photodiode for receiving optical signal pulses from the telephone, a display for generating optical signal pulses for transferring information to the telephone, and control circuits including an E2PROM and a microprocessor. Information which can be stored in the E2PROM under control of the telephone includes a list of numbers frequently called and the amount of prepaid credit remaining on the card.

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