| 摘要 |
PURPOSE:To discriminate the transmission quality of each relay section by the execution of one test by inserting an address and an error bit number to a test result data section of a test data string and using a test equipment to read it. CONSTITUTION:A test pattern string sent from a test pattern generating circuit 1 is synchronized by a synchronizing circuit 5 of a repeater. An error of a test data part of the test pattern string is detected by an error detection circuit 7 in the timing of the synchronizing circuit and the error bit number is counted. A data insertion circuit 8 inserts a test pattern string generated in a test pattern generating circuit 6 to a test data section 9 and an error bit number from the error detection circuit 7 and an address of the said relay section to a test result data section 10 respectively. A discriminating circuit 4 reads the error bit number together with the address of each relay section from the test result data section 10 for the test pattern string so as to discriminate the transmission quality of each relay section.
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