Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent
1993-12-30
1995-12-26
Eisenzopf, Reinhard J.
Telephonic communications
Having light wave or ultrasonic link for speech or paging...
Including fiber optic link within telephone network
455 331, 375216, 375222, H04M 1100
Patent
active
054794803
ABSTRACT:
A mobile phone includes a modem, hereinafter referred to as a cellular radio modem. This cellular radio modem supports two modes of operation--an analog mode, where the cellular radio modem provides an analog signal for transmission; and a digital mode, where the cellular radio modem provides a digital bit stream for transmission. During operation, i.e., the existence of a data connection to a far-end modem, the cellular radio modem is alerted by the cellular network to switch to the appropriate mode--analog or digital. The cellular radio modem then switches and continues transmission in the new mode. In this embodiment, the far-end modem is part of a modem-pool located within the Mobile Telecommunications Switching Office of the cellular network. The far-end modem automatically detects this switch by the cellular radio modem and itself switches to the appropriate mode. This allows a mobile data user to transparently move between the analog mode and the digital mode without disconnecting a preexisting data connection.
REFERENCES:
patent: 4355401 (1982-10-01), Ikoma et al.
patent: 4912756 (1990-03-01), Hop
patent: 5134611 (1992-07-01), Steinka et al.
"A Modem/Codec for Cellular Telephony"; Lakshmikumar et al. 1993 IEEE International Solid-State Circuits Conference; pp. 148-149.
"Trends in Cellular & Cordless Communications" IEEE Communications Mag., Jun. 1991; Goodman; pp. 31-40.
AT&T Corp.
Eisenzopf Reinhard J.
Faile Andrew
Opalach Joseph J.
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