Patent ID: 6141326
Filing Date: 2000-10-31
Classification: H04L

Abstract:
An exchange for extracting a cell that has been mapped to a payload of a line signal, converting the cell to an intra-office cell that includes routing information, and sending the intra-office cell to a prescribed line by switching the intra-office cell on the basis of the routing information, comprising:a plurality of cell traversing units through which cells pass; anda processor for controlling each of said cell traversing units; whereineach of said cell traversing units has a counter for counting passing cells on a per-connection basis and a information add-on means for adding the passing cell count as well as unit identification data onto an intra-office cell and then transmitting the intra-office cell;a cell traversing unit of said cell traversing units that serves as an end unit has a error information accumulating means for accumulating, for each cell traversing unit and on a per-connection basis, the passing cell counts sent from other cell traversing units; andsaid processor detects a fault in a cell traversing unit based upon the passing cell count, on the per-connection basis, of each cell traversing unit, the passing cell count having been accumulated in said cell traversing unit serving as the end unit.