Patent ID: 6577629
Filing Date: 2003-06-10
Classification: H04L,H04Q

Abstract:
A switch network which operates in accordance with the asynchronous transfer mode, comprising: a switching unit (1, 10) for changing selected contents in the header field of a cell, characterized in that a pre-processing circuit (2, 8) is coupled to each input of the switching unit (1, 10), and a post-processing circuit (3, 9) is coupled to each output of the switching unit (1, 10),upon the arrival of a cell, which is assigned to a specific virtual connection, each pre-processing circuit (2, 8) is provided to store the selected contents of the header field of the cell in an associated table if no entry is stored in connection with this virtual connection or if a stored entry in the associated table deviates from the selected contents of the header field, a table is assigned to each post-processing circuit (3, 9), which table is provided to store the selected contents supplied by a pre-processing circuit (2, 8) which is associated with a virtual connection, and after a cell associated with a specific virtual connection is received in a post-processing circuit (3, 9), a selected contents of the header field of this cell is replaced by the selected contents stored in the table.