System and method for interfacing computers to diverse telephone networks
June 1, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesTelephone patch Multi-channel access (MCA) radio telephone system System for interfacing a standard telephone set with a radio transceiver Portable radiotelephone vehicular converter and remote handset Cellular telephone data communication system and method Microprocessor controlled interface for cellular system Programmable system for interfacing a standard telephone set with a radio transceiver Corded/cordless telephone Analog telephone circuit for digital telephone system System for interfacing a standard telephone set with a radio transceiver InventorAssigneeApplicationNo. 531762 filed on 06/01/1990US Classes:455/557, Interface attached device (e.g., interface with modem, facsimile, computer, etc.)379/93.05Terminal interface circuitryExaminersPrimary: Dwyer, James L.Assistant: Bost, Dwayne D. Attorney, Agent or FirmForeign Patent References
International ClassH04M 011/00AbstractA system for connecting a computer to both cellular and landline telephone systems is disclosed. A cellular modem has a single RJ-11 jack for interfacing either to a landline jack or to a signal processing cable connected to a cellular transceiver. The analog data transmission signals of the modem, which are compatible with landline "tip" and "ring" lines, are provided on the third and fourth pins of the RJ-11 connector. When the modem is to be used as a landline modem, the RJ-11 connector is connected directly to a standard landline telephone jack using an ordinary modular telephone wire. When used with a cellular transceiver, the modem generates transceiver operation commands according to a predefined generic command language which is not specific to a particular transceiver. The generic commands are transmitted in serial digital form on the fifth terminal of the RJ-11 connector. The signal processing cable acknowledges the commands received via a serial digital signal transmitted to the second terminal of the RJ-11 connector. The signal processing cable then transmits control signals to the transceiver, with the signals being appropriate to the type of cellular transceiver used, to produce the function requested by the modem's universal command.Other References
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