Digital modem
First Claim
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1. A communication system, comprising:
- a data device for generating and receiving digital data;
a digital switch for connecting said data device to one of a plurality of communication lines; and
a converter connected to said digital switch for converting digital data to a corresponding digital signal representing a time sampled analog signal, and for converting time sampled analog signals to corresponding digital data;
wherein said switch connects said data device and said converter together, and wherein digital data generated by said data device is converted to a time sampled analog signal in said converter, and wherein time sampled analog signals received by said converter are converted to digital data which is communicated to said data device.
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Abstract
A digital modem is connected to a CBX in a network. Data is transmitted to the digital modem in a data field of synchronous serial data frames. The digital modem converts the data into a digital signal corresponding to a time sampled analog signal representing the data. The converted digital signal is communicated to a digital to analog converter for transmission on a telephone line. Analog signals received on the telephone line are digitized, and then converted to data in the digital modem.
127 Citations
13 Claims
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1. A communication system, comprising:
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a data device for generating and receiving digital data; a digital switch for connecting said data device to one of a plurality of communication lines; and a converter connected to said digital switch for converting digital data to a corresponding digital signal representing a time sampled analog signal, and for converting time sampled analog signals to corresponding digital data; wherein said switch connects said data device and said converter together, and wherein digital data generated by said data device is converted to a time sampled analog signal in said converter, and wherein time sampled analog signals received by said converter are converted to digital data which is communicated to said data device. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A digital modem, comprising:
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an interface for bidirectional communication over an external communications line of synchronous serial data in frames each having a first field and a second field; a serial converter connected to said interface for converting data received from said interface and contained in the first field into asynchronous serial data, and for converting asynchronous serial data into synchronous serial data to be placed into the first field for communication to said interface; a data converter connected to said interface and said serial converter, wherein said data converter receives asynchronous serial data from said serial converter and generates a corresponding digital signal representing a time sampled analog signal to be communicated to said interface and therein placed into the second field, and wherein said data converter receives digital signals from said interface and converts data in the second field into asynchronous serial data for communication to said serial converter. - View Dependent Claims (8, 9, 10)
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11. A method for communicating information between a data device and an analog communications line, comprising the steps of:
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(a) communicating digital data between the data device and a digital switch; (b) communicating digital data between the digital switch and a converter; (c) communicating time sampled analog signals between the digital switch and the converter; (d) within the converter, converting digital data received from the digital switch to time sampled analog signals for communication to the digital switch; (e) within the converter, converting time sampled analog signals received from the digital switch to digital data signals for communication to the digital switch; (f) converting time sampled analog signals generated by the converter into analog signals; (g) communicating the analog signals of step (f) to an analog communications line; (h) receiving analog signals from the analog communications line; and (i) converting the analog signals of step (h) into time sampled analog signals for communication to the digital switch. - View Dependent Claims (12)
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13. A method of converting data, comprising the steps of:
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(a) receiving synchronous serial data in received data frames having a data field; (b) converting such synchronous serial data to asynchronous serial data; (c) converting such asynchronous serial data to corresponding synchronous serial data representing time sampled analog data; (d) transmitting the synchronous data of step (c) in transmitted data frames having a sampled data field; (e) receiving time sampled analog data in a sampled data field of received data frames; (f) converting the time sampled analog data of step (e) into asynchronous serial data; (g) converting the asynchronous serial data of step (f) into synchronous serial data; and (h) transmitting the synchronous serial data of step (g) in a data field of the transmitted data frames.
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Specification