Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent
1993-10-18
1996-07-02
Kuntz, Curtis
Telephonic communications
Having light wave or ultrasonic link for speech or paging...
Including fiber optic link within telephone network
3403111, H04Q 710
Patent
active
055330959
ABSTRACT:
A data transfer system capable of preventing a transmitter from receiving erroneous message data because of an instantaneous interruption of a transmission line. The radio paging terminal includes a message data transmission circuit for transmitting inputted message data through a transmission line. The transmitter, which is connected to the transmission line, receives an output signal from the message data transmission circuit via the transmission line and outputs the output signal to a modulator section and a transmitter section which transmits the message data as radio waves for data transfer with the radio paging terminal. The transmitter also includes a receiver for receiving the radio waves radiated from the transmitter section and for outputting the demodulated message data to the radio paging terminal. The radio paging terminal also includes a message data receiving circuit for receiving the message data outputted from the receiver, a comparator circuit for comparing the received message data with the message data transmitted by the message data transmission circuit, and a message data output circuit for outputting the message data found to be different as a result of the comparison.
REFERENCES:
patent: 4868560 (1989-09-01), Oliwa et al.
patent: 5289524 (1994-02-01), Takano et al.
patent: 5315635 (1994-05-01), Kane et al.
Kuntz Curtis
NEC Corporation
Trost William G.
LandOfFree
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