| 摘要 |
A method and apparatus is provided for identifying valid cells in a redundant path combining unit of an asynchronous transfer mode switch having duplicated switching planes. The method comprising the steps of:- a) Identifying the plane from which came the last cell to be passed in respect of a particular call, b) Checking that a sequence number associated with the cell is not one greater than that stored in a storage means, c) Checking that the last cell to be passed on the particular call was from the same plane, d) Checking if the cell is a duplicate of the last cell to arrive on this plane, and, e) Passing the cell to an output store if (c) is true and (d) is not true and storing in the storage means the sequence number of the cell. <IMAGE> |
