Phone line computer networking
First Claim
1. A system for local area networking among a plurality of devices on a local loop of an analog telephone line simultaneously with analog telephony, said system comprising:
- a plurality of high-frequency modems coupled to said telephone line, each modem coupled to one of said devices, each modem adapted to receive and transmit signals of frequencies higher than an analog telephony range, each modem adapted to full duplex by a use of one of a bandsplitting and an echo cancellation;
a high-frequency bandpass filter coupled to each modem for eliminating signals of frequencies within the analog telephony range from being received by said modem; and
an audio frequency bandpass filter coupled to said telephone line at a junction, said junction defining the boundary of said local loop, said filter adapted to prevent said higher-frequency signals from radiating outside said local loop.
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Accused Products
Abstract
The invention provides for simultaneous local area networking and analog telephony using a single telephone line. The local area networking is carried out using two or more high-frequency modems, which when coupled to devices, can transfer data on high-frequency signals. These high-frequency signals may be carried on the telephone line along with the lower frequency signals used for analog telephony provided there is proper isolation. Thus, the invention utilizes selectively high-frequency bandpass and audio frequency bandpass filters coupled to the telephone line.
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Citations
12 Claims
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1. A system for local area networking among a plurality of devices on a local loop of an analog telephone line simultaneously with analog telephony, said system comprising:
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a plurality of high-frequency modems coupled to said telephone line, each modem coupled to one of said devices, each modem adapted to receive and transmit signals of frequencies higher than an analog telephony range, each modem adapted to full duplex by a use of one of a bandsplitting and an echo cancellation; a high-frequency bandpass filter coupled to each modem for eliminating signals of frequencies within the analog telephony range from being received by said modem; and an audio frequency bandpass filter coupled to said telephone line at a junction, said junction defining the boundary of said local loop, said filter adapted to prevent said higher-frequency signals from radiating outside said local loop. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for simultaneous local area networking and analog telephony on a local loop comprising the steps of:
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setting up the local loop for high-frequency local area networking; setting up devices to be local area networked with high-frequency modems; initiating said modems to send and receive data signals at high frequency, said modems configure to operate at full duplex by using one of a bandsplitting and an echo cancellation; and communicating among said devices, said modems broadcasting high-frequency data signals on the local loop simultaneously with audio-range low frequency signals for analog telephony outside said local loop. - View Dependent Claims (10, 11, 12)
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Specification