Ikanos Communications, Inc.

At&t Bell Laboratories

Globespan Virata Corporation

Robert A Day

William Lewis Betts

Sigurd Schelstraete

Patrick Duvaut

Amitkumar Mahadevan

Massimo Sorbara

Rahul Garg

Kunal Raheja

Robin Levonas

Peter D Keller

Hemant Kumar Samdani

Kamal Patel

Kamran Khederzadeh

Systems and methods for synchronizing a clock at a customer premises equipment (CPE) location with a master clock at a central office (CO) location are described. One embodiment is a method that comprises receiving, by a time-of-day transmission convergence (ToD-TC) module in the CPE, ToD information relating to the master clock. Based on the received information, time stamps are applied to reference data samples. The method further comprises transporting the ToD information by transporting the reference data samples with applied time stamps and utilizing time stamps of the reference data samples to synchronize the CPE clock with the master clock.

Systems and methods for transporting time-of-day information in a communication system

Systems and methods for monitoring impulse noise are described. At least one embodiment is a method, which comprises detecting whether impulse noise is present and in response to detecting the presence of impulse noise, performing time domain analysis to determine whether one or more impulse noise sources are present based on minimum interarrival time and maximum impulse length. The method further includes performing frequency domain analysis to estimate frequencies associated with the one or more impulse noise sources and based on the time domain analysis and frequency domain analysis, providing a total number of impulse noise sources and frequencies associated with the impulse noise sources. In this regard, the embodiments described herein provide dual-speed monitoring of impulse noise in the form of short-term and long-term monitoring. The use of dual-speed monitoring ensures that dynamic changes in the impulse noise environment are quickly addressed and also ensures better characterization of multiple impulse noise sources in order to provide better impulse noise protection.

Systems and methods for monitoring impulse noise

A system and method for ADSL USB bandwidth negotiation are presented. The system comprises a modem that is configured to transfer data between an ADSL line and a USB bus and that is further configured to receive an ADSL line rate setting, submit an isochronous bandwidth request to a computer, reduce the isochronous bandwidth request in response to the availability of isochronous bandwidth, modify the ADSL line rate setting in response to the availability of isochronous bandwidth, and modify the USB bus transfer mode in response to the availability of isochronous bandwidth. The method comprises steps of receiving an ADSL line rate setting, submitting an isochronous bandwidth request to a computer, reducing the isochronous bandwidth request in response to the availability of isochronous bandwidth, modifying the ADSL line rate setting in response to the availability of isochronous bandwidth, and modifying the USB bus transfer mode of the ADSL USB modem in response to the availability of isochronous bandwidth.

System and method for ADSL USB bandwidth negotiation

In a full-duplex modem, correlation of an echo estimate signal with an echo-canceled signal is used to determine the presence or absence of a remote signal.

Detecting loss of echo cancellation

Growing community of inventors

Manalapan, NJ, United States of America

Robert A Day