FUNCTION TESTING METHOD FOR ASYNCHRONOUS TRANSFER MODE DEVICE

PROBLEM TO BE SOLVED: To cope with various patterns and to easily and surely conduct a quality test by adding additional information corresponding to respective function parts to the payload of a cell, inputting it to an asynchronous transfer mode device, extracting additional information of the outputted cell in a device and judging the normality of the corresponding function part from additional information and the state of the cell. SOLUTION: In the verification of the operation of a header conversion part, a cell generator 2 adds predicted conversion header information to the payload of the cell from the header pattern table of a header conversion information part 241 on the cell generated by a cell generation part 21. A cell tester 3 separates and takes out header information and predicted conversion header pattern in a separation part 312 when the cell arrives and verifies the matching of the two header patterns in a comparison circuit 313 only at a part where the specified conversion mask pattern is not designated by a mask pattern table 311. Thus, comparison verification is automatically realized.