| 摘要 |
PURPOSE:To attain surely the detection of position shift of bit of a test data when a continuity fault occurs by providing an optional pattern generating circuit in addition to a generating circuit of alternate patterns in a transmission section. CONSTITUTION:The alternate pattern data is generated at an AA/55 generating circuit 4 and transmitted to a time division connection path from a transmission circuit 5 through a pattern selector 9 by the control of the control circuit 1. Then the received test data is collated by a collation circuit 7 with a transmitted data and the result is reported to the control circuit 1. When the continuity is defective, the test data of a proper optional pattern is set as the retest to an optional pattern generating circuit 8, the pattern selector 9 is changed over to the optional pattern generating circuit 8 and the similar collation is attained. |
