| 摘要 |
PURPOSE:To execute a diagnosis without installing a testing device at the outside, by utilizing a pattern generating circuit and an alarm detecting circuit which are integrated into a device in advance, at the time of diagnosing an arbitrary path, and diagnosing its path by dividing it into two times. CONSTITUTION:From an auxiliary output port D of a cross connecting device 12, a pattern signal is outputted by a pattern generating circuit provided on the output port side. Subsequently, when the pattern signal is outputted from an input part 1 to an output port 2 through a path formed between relay circuits 13, 11, a diagnosis of the path is executed by checking whether an alarm exists or not by alarm detecting circuits A-C provided on the input port, the path on the way, and the output port, respectively. Also, the diagnosis is executed by sending out a pattern signal from an output B of the output port 2, and checking an alarm by an alarm detecting circuit A of an auxiliary or dead input port. In such a way, the diagnosis can be executed without preparing an exclusive testing device.
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