Patent ID: 6044077
Filing Date: 2000-03-28
Classification: H04L,H04Q

Abstract:
An Asynchronous Transfer Mode (ATM) switch including:a first look-up table having a plurality of storage locations for cell switching information, each of said storage locations being addressable by a particular combination of Virtual Path Identifier (VPI) and Virtual Channel Identifier (VCI) values;a second look-up table having a plurality of storage locations for cell switching information, each of said storage locations being addressable by a particular VPI value;an addressing subsystem for determining whether the first look-up table includes a storage location addressable by a combination of VPI and VCI values in a cell being processed and for simultaneously determining whether the second look-up table includes a storage location addressable by a VPI value in the same cell;priority logic responsive to the detection of an addressable storage location in the first look-up table to select cell switching information contained in the first look-up table, said priority logic selecting cell switching information contained in the second look-up table only where an addressable storage location is not detected in the first-lookup table; andcell processing logic for processing the received cell using the cell switching information selected by the priority logic.