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Abstract

A method for flow control in asymmetric digital subscriber line ('ADSL') devices. The method includes flow control that adapts to changes in line conditions such as noise signals, onhook/offhook signals, etc. that may result in degradations in the quality-of-service in an ADSL system. The flow control includes buffering outbound data and ceasing transmission of data at an original transmission rate on an ADSL device that is used on a customer site. An original data transmission rate is adjusted based on changes in line conditions. One more or data transmission characteristics may be adjusted before sending any data at a new data transmission rate. For example, Asynchronous Transport Mode ('ATM') often uses ADSL devices as a physical layer to transmit data. ATM available bit-rate, constant bit-rate, variable bit-rate or unspecified bit-rate transmission characteristics or ATM quality-of -service characteristics may be adjusted before sending any data at a new data transmission rate. Traffic shaping may be optionally applied to the data at the new data transmission rate. The method may be especially useful for maintaining a quality-of-service transmission at a lower transmission rate, using splitterless ADSLs, or 'Lite ADSL' (e.g., G.lite).

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First Claim