Patent ID: 6570915
Filing Date: 2003-05-27
Classification: H04L,Y02D

Abstract:
A method of switching a first data rate to a second data rate in a communication system including a first DSL device and a second DSL device, said method comprising the steps of:transmitting a discovery message by said first DSL device to said second DSL device; receiving a discovery response message from said second DSL device in response to said transmitting said discovery message; transmitting a probe message to said second DSL device in response to said receiving said discovery response message; transmitting a first probe signal to said second DSL device following said transmitting said probe message; receiving a second probe signal from said second DSL device in response to said transmitting said first probe signal; receiving a probe response message from said second DSL device in response to said transmitting said first probe signal; negotiating said first data rate based on said probe response message; synchronizing with said second DSL device at said first data rate; measuring a line quality at said first data rate; determining said second data rate based on said line quality; transmitting a rate change request by said first DSL device to said second DSL device, said rate change request including said second data rate; and re-synchronizing with said second DSL device at said second data rate; wherein each said message includes an opcode segment, a data field segment and a checksum segment, and wherein each said segment includes a plurality of data bits represented by an energy on-time or off-time.