| 摘要 |
PROBLEM TO BE SOLVED: To grasp the generation frequency of an abnormal temperature state and the kind of a generated error and to facilitate maintenance by a method wherein the abnormal temperature state is counted when a detected temperature exceeds a specific temperature continuously for a preset specific period. SOLUTION: A temperature detection part 20 detects a temperature around a subscriber station. A temperature detecting treatment parameter which performs a temperature detecting treatment to detect an ambient temperature state, the number of times of the detection of an abnormal temperature state as the number of times of a detected abnormal temperature state and an error flag which indicates the generation state of an error are stored in a nonvolatile memory 10. A control part 7 executes a temperature detecting treatment which detects an ambient temperature state and an error detecting treatment which detects the generation state of an error. At this time, the temperature detecting treatment monitors an ambient temperature according to the temperature detecting treatment parameter stored in the nonvolatile memory 10, and the number of times of the detected abnormal temperature state is stored in the nonvolatile memory 10. |
