| 摘要 |
PURPOSE:To reduce the man-hours of maintenance by providing a device which tests a subscriber line periodically according to sequence decided in advance, and monitors and accumulates the result of a test, and performs a statistical processing. CONSTITUTION:An external statistical processor 1 inputs a command to test plural subscriber lines periodically according to the sequence decided in advance and the designation data of the subscriber line to a monitoring test unit 3. The monitoring test unit 3 monitors the command, and collects and accumulates it. When the maintenance engineer of an ISDN exchange 2 inputs the command to the external statistical processor 1, the statistical processing is performed, then, the result is outputted.
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