Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent
1993-12-02
1996-08-27
Coles, Sr, Ewdard L.
Telephonic communications
Having light wave or ultrasonic link for speech or paging...
Including fiber optic link within telephone network
379 58, 379 61, 455 331, 455 561, H04M 1100
Patent
active
055508952
ABSTRACT:
A bimodal portable telephone provides cellular service and improved cordless service in a common handset. Operation of the bimodal portable telephone in a cellular telephone system provides telephone service over a wide geographical area of coverage through operation with multiple cellular bases and in a cordless telephone system provides telephone service over a localized geographical area of coverage through operation with an associated cordless base. The cordless service provides improved performance over convention cordless telephone service by advantageously employing a frequency hopping spread spectrum modulation technique for communications between the portable telephone and the cordless base unit. This improved performance achieves increased operating range of the cordless telephone system. This increased operating range is particular advantageous to the user of the portable telephone in that it permits this more economical system to be used over a much greater distance than is possible with convention cordless telephone service. Also commonality of circuitry within the portable telephone is facilitied through the selection of operating frequencies for the cordless telephone system to be in close proximity with those of the cellular telephone system.
REFERENCES:
patent: 4989230 (1991-01-01), Gillig et al.
patent: 5115463 (1992-05-01), Moldavsky et al.
patent: 5119397 (1992-06-01), Dahlin et al.
patent: 5291516 (1994-03-01), Dixon et al.
patent: 5442680 (1995-07-01), Schellinger et al.
Burson Kyle L.
Chang Yum C.
Fok Wilson
Leland Kenneth W.
Orlando Denis P.
Coles, Sr Ewdard L.
Lucent Technologies - Inc.
Stoll Thomas L.
Williamson Samuel R.
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