| 摘要 |
PURPOSE:To detect troubles easily in a short time, by converting signals, which are transmitted through plural signal transmission lines, to serial signals in the transmission side and the receiving side and discriminating a trouble on a basis of the number of times of uncoincidence between them. CONSTITUTION:A parallel test signal is generated in a signal generating circuit 3 and is supplied to signal transmission lines 21-2L. Parallel signals given to signal transmission lines 21-2L are converted to serial signals, which are arranged in the order of signal transmission lines 21-2L, in two converting circuits 4 and 4'. The output of the converting circuit is given directly to a discriminating circuit 6, and the output of the converting circuit 4' is given to the discriminating circuit 6 through an echo signal transmission line 5. Outputs of converting circuits 4 and 4' are compared with each other successively in a coincidence detecting circuit of the discriminating circuit 6; and if the uncoincidence is detected repeatedly over the prescribed number of times, it is discriminated that the signal transmission line is faulty. |
