| 摘要 |
Even before a communication partner device is incorporated into an operating state, an abnormal communication partner device can be detected, so that it is possible to prevent an abnormal communication partner device from affecting communications with other devices, whereby stable communications can be achieved. To this end, a signal monitoring device includes abnormality detecting means for detecting an abnormality of a communication partner device based on whether a receiving signal exists at a time slot allocated as a non-use bandwidth or not.
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