Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
2002-09-18
2009-02-10
Pham, Chi H (Department: 2416)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S465000, C370S466000, C370S338000, C370S255000, C370S469000, C370S231000, C370S252000, C370S467000, C370S254000, C370S389000, C370S392000, C370S395100, C370S395520, C370S400000, C370S409000
Reexamination Certificate
active
07489693
ABSTRACT:
Automatic detection of the virtual circuit setting and encapsulation type of a DSL line. A DSL modem determines the correct virtual path identifier (VPI) and virtual channel identifier (VCI) by sending OAM loopback requests to different VPI/VCI pairs until a valid loopback reply is received. PPPoA encapsulation is detected when a valid reply is received to a PPP LCP configuration request or echo request. PPPoE encapsulation is detected when a valid reply is received to a PPP LCP termination request or a PPPoE discovery offer (a PADO packet) is received in response to a PPPoE discovery initiation request (a PADI packet).
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Conexant Systems Inc.
Jain Raj K
Pham Chi H
Thomas Kayden Horstemeyer & Risley LLP
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