Two-wire full-duplex modem

Details Two-wire full-duplex modem Two-wire full-duplex modem

1993-07-12

1997-05-20

Chin, Stephen

Pulse or digital communications

Transceivers

Modems

370280, 370286, 379 3, H03D 324

Patent

active

056319231

ABSTRACT:
In a modem, after scrambling data which are time-divided into main data and secondary data, a 2 W-4 W conversion circuit sends the data to the two-wire line. An estimated echo component is subtracted from a signal which is available from the 2 W-4 W conversion circuit. Following this, the signal from the 2 W-4 W conversion circuit is demodulated, descrambled and separated into main data and secondary data. A generator polynomial for scrambling is different from a generator polynomial for descrambling. The modem comprises a line-trouble-detect part which samples data of the secondary channel, by multipoint sampling, to obtain the secondary data and detects the number of inversion points in the descrambled secondary channel data per unit time period. The line-trouble-detect part outputs a line-trouble signal which indicates that there is a trouble on the line if the number of detected inversion points is more than a predetermined number.

REFERENCES:
patent: 4241311 (1980-12-01), Massey
patent: 4799214 (1989-01-01), Kaku
patent: 5166975 (1992-11-01), Maei
patent: 5214637 (1993-05-01), Sridhar et al.
patent: 5347539 (1994-09-01), Sridhar et al.

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