Data transmission circuit for an electricity mains network havin

Details Data transmission circuit for an electricity mains network havin Data transmission circuit for an electricity mains network havin

1995-12-06

1998-06-16

Tse, Young T.

Pulse or digital communications

Transceivers

Modems

375224, 375377, H04L 1226

Patent

active

057683107

ABSTRACT:
The invention concerns a data transmission circuit, for use on a mains electricity network, that includes a modulator/ demodulator circuit that supplies a first signal, which indicates if the network is occupied, that is based upon a comparison between the level of a received signal and a predetermined threshold value and circuitry for switching a modem into its receive mode or its transmit mode, including a digital circuit that supplies a second signal that indicates the occupation of the network based on the identification of a predetermined data sequence that is present within each transmission stream before a data message and circuitry for allowing the modem to switch to its transmit mode when the occupation signals indicate an absence of a transmission.

REFERENCES:
patent: 4689801 (1987-08-01), Nurczyk et al.
patent: 4932037 (1990-06-01), Simpson et al.
patent: 5089974 (1992-02-01), Demeyer et al.
patent: 5448593 (1995-09-01), Hell
patent: 5499318 (1996-03-01), Kopp et al.
French Search Report from French Patent Application 94 15523, filed Dec. 16, 1994.
IEEE Transactions On Consumer Electronics, vol. Ce-29, No. 3, Aug. 1983, New York, US, pp. 297-304, F.W. Gutzwiller et al., "Homenet: A Control Network For Consumer Applications".
IBM Technical Disclosure Bulletin, vol. 22, No. 8a, Jan. 1980, New York, US, pp. 3364-3366, "Multi-Access Medium Capture By Preamble Technique".

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