Method of invoking and cancelling voice or data service from a mobile unit
A mobile unit, data technology, applied in the field of communication, can solve the problem that the wireless channel cannot be effectively used and so on
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[0016] Currently, there are several methods of transferring data from one terminal to another using the standard telephone network. Terminals connected via the telephone network may be fax machines, personal computers, credit card validators and telemetry devices. The standard connections for these devices are shown in Figure 1. For example, assume that the terminal device 10 transmits information to the terminal device 50 . The terminal device generates digital data 110 representing this information. Modem 20 converts digital data 110 into analog signal 120 . The analog signal 120 has a bandwidth and power level suitable for transmission over the standard telephone network 30 . Telephone network 30 transmits analog signal 120 to its destination. The telephone network introduces noise, so the output audible signal 130 is an estimate of the analog signal 120 . Modem 40 converts audible signal 130 into digital data 140, which is an estimate of the digital signal. The termi...
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