Non-intrusive diagnostic system for a digital modem transmission

Details Non-intrusive diagnostic system for a digital modem transmission Non-intrusive diagnostic system for a digital modem transmission

1989-12-27

1991-08-13

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375102, 455 67, H04B 346

Patent

active

050401815

ABSTRACT:
A non-intrusive diagnostic system for a transmission channel for a digital modem is appllied to a demodulator-regenerator, and, in each of the channels (14, 15) for the signals demodulated into baseband, it includes an analog-to-digital converter (16, 17) which is clocked by a clock signal at a frequency equal to a multiple of the symbol rate (H), said multiple being not less than twice said rate.

REFERENCES:
patent: 4726040 (1988-02-01), Acampora
patent: 4745392 (1988-05-01), Ise et al.
patent: 4800507 (1989-01-01), Brown
patent: 4805189 (1989-02-01), Mahoney
patent: 4866395 (1989-09-01), Hostetter
patent: 4920543 (1990-04-01), Martin
IEE Global Telecommunications Conference & Exhibition, Hollywood, FL, Nov. 28, Dec. 1, 1988, vol. 1, pp. 0158-0162, IEE, New York, U.S.; H. J. Choi: "Estimation of Signal Parameters by Using Digital Techniques". p. 0159, left col., lines 1-12, 40-46; p. 0159 right col., lines 20-27, FIGS. 3,4.
Electronics, vol. 61, No. 4, Feb. 18, 1988, pp. 54D-54E, New York, US; P. Fletcher: "Ethernet Analyzer Spots Trouble before the Network Crashes", p. 54D, right col., lines 30-44.
Mesures, vol. 52, No. 14, Nov. 23, 1987, pp. 81-83, Paris, France; "Analyse de Constellation, Reellement Simple?", p. 81, median column, lines 19-24; p. 81, right column, lines 12-14.
Hewlett-Packard Journal, vol. 38, Oct. 10, 1987, pp. 4-15, Palo Alto, CA, US; N. Carder et al.: "In-Service Transmission Impairment Testing of Voice-Frequency Data Circuits", p. 13, left column, lines 1-17.

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