Modem for selectively connecting to a land line or to a cellular telephone

摘要

A modem in the form of a single integrated portable unit is provided for operably connecting to a computer for transferring data between the computer and a remote data transfer device over a selected one of a plurality of telephone network access devices including a radiotelephone network access device. The modem includes internal data lines for carrying the data passing between the modem and the radiotelephone network access device, internal control signal lines for carrying control signals for controlling and/or monitoring the operation of the radiotelephone network access device. A jack is connected to the control signal lines and the data lines for providing an external connection of the data lines and signal lines to the radiotelephone network access device. A modem controller operates to access one of a plurality of software drivers for operating the modem in conjunction with the selected one of the plurality of telephone network access devices to cause the operation of the control signal lines to be varied in response to the software driver to permit the control of call placement functions of the selected telephone network access device by the modem.