Cellular data telephone system and cellular data telephone there

Details Cellular data telephone system and cellular data telephone there Cellular data telephone system and cellular data telephone there

1988-03-18

1989-06-06

Lev, Robert

Telephonic communications

Having light wave or ultrasonic link for speech or paging...

Including fiber optic link within telephone network

379 63, 455 33, H01Q 704

Patent

active

048378003

ABSTRACT:
A unique cellular data telephone system includes a cellular telephone system (CTS 150), a cellular data switch (CDS 170), and a telephone central office (130) for providing both voice and data telephone servies to portable and mobile cellular data telephone (CDTs 102, 122) located anywhere in a large geographical area. Each of the CDTs (102, 122) includes a data control unit (DCU 106), a cellular modem (162) and a cellular telephone (108) and associated antenna (110), and connects to a data terminal (104, 124) with keyboard and display. DCU (106) includes memory (302) for storing a CDS telephone number and CDT telephone number, microcomputer (304) with internal memory for controlling data communications between cellular modem (162) and data terminal (104), a dual tone multifrequency ("DTMF") encoder (306) for encoding telephone numbers and control signals, a DTMF decoder (314) for decoding DTMF telephone digits and/or DTMF control tones, a buffer (312) for storing transmit data from data terminal (104), and analog switches (308, 310) for coupling DTMF encoder (306) and buffer (312) to the transmit data Td signal to cellular modem (162). If data terminal (104) is inactive for a predetermined time interval, DCU (106) automatically disconnects the cellular telephone call while maintaining the landline telephone call to a data host (140, 141). Once data is transmitted again by data terminal (104), DCU (106) automatically places another cellular telephone call and is reconnected to the landline telephone call.

REFERENCES:
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patent: 4376310 (1983-03-01), Stackhouse et al.
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patent: 4534061 (1985-08-01), Ulug
patent: 4612415 (1986-09-01), Zounek
patent: 4654867 (1987-03-01), Labedz et al.
patent: 4723264 (1988-02-01), Sasuta et al.
patent: 4730187 (1988-03-01), Menion et al.
patent: 4776003 (1988-10-01), Harris

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