Method for reducing noise from a non-linear device that...

Details Method for reducing noise from a non-linear device that... Method for reducing noise from a non-linear device that...

2005-02-15

2005-02-15

Kuntz, Curtis (Department: 2643)

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

C379S392010, C379S001030

Reexamination Certificate

active

06856683

ABSTRACT:
A method for reducing noise from a non-linear device, such as a telephone, that shares a customer loop with a splitterless Asymmetric Digital Subscriber Line modem. The non-linearity of the device can cause some of the upstream signal to bleed into the downstream signal band. The modem examines the downstream band when it is transmitting fast retrain signals. By comparing the power in the band to a previous value when the modem transmitted upstream at a higher power level, the modem may determine whether to cut back its transmitted power to lessen the noise in the downstream band. In this manner, the method may allow optimal downstream data transfer regardless of what non-linear device shares the customer loop with the ADSL modem.

REFERENCES:
patent: 5265151 (1993-11-01), Goldstein
patent: 6456650 (2002-09-01), Cheng et al.
ITU-T Reccommendation G.992.2 (06/99)—Splitterless asymmetric digital subscriber line (ADSL) transceivers. (no pages on document) relevent sections: 12.1,11.10.8, 12.3.5, 3.1.19-3.1.24.*
ITU-Telecommunication Standardization Sector, Jan. 18-22, 1999, Draft Recommendation G.992.2, pp. 1-152.
ITU-Telecommunication Standardization Sector, Oct. 12-23, 1998, G.994.1 Draft Document, pp. 1-35.
Tamperer University of Technology Telecommunication Laboratory, Feb. 17, 1995, ADSL, pp. 1-20.
ITU-T Recommendation G.992.2 (06/99)—Splitterless asymmetric digital subscriber line (ADSL) transceivers.
ITU-T Recommendation G.994.1 (06/99)—Handshake procedures for digital subscriber line (DSL) transceivers.

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