Patent ID: 6560197
Filing Date: 2003-05-06
Classification: H04L,H04M,H04Q,Y02D

Abstract:
In a distributed digital subscriber line (xDSL) modem pool system including a plurality of front-end modules and a plurality of back-end modules capable of contemporaneously servicing a plurality of call sessions, a method of maintaining the physical layer link of a DSL call session for duration of the call session, each call session being serviced by both a front-end module and a back-end module dynamically assigned thereto at call setup and having an initial data throughput rate, the method comprising:(a) in a front-end module servicing a call session presently in active-mode, generating digital samples representative of DSL frame data transmitted by a user terminal device over the corresponding call session physical layer link; (b) in a back-end module servicing the call session which is presently in active-mode, processing the digital samples as a function of the initial data throughput rate; (c) in the front-end module, detecting an idle-mode modulated symbol indicative of idle-mode; and (d) relinquishing control of the call session to the front-end module by the back-end module during idle-mode.