| 摘要 |
PURPOSE:To attain the accurate administration of a communication equipment by transmitting a return confirmation signal to a specified communication equipment when a bit of simultaneous multiple address information is not received from the specified communication equipment for a regulated period, and deciding a state based on a response state. CONSTITUTION:Each bit of simultaneous multiple address information at every thirty seconds lapse from all of other communication equipments 1b-1n is written on each corresponding area of memory areas 15b-15n within a memory device 15. When the content of the memory 15b is good as a result by checking, a corresponding counter 16b is set initially, then its value being set as '9' and when it is bad, the value of the counter 16b is set as '-1'. When the value becomes '1', since it means that a bit of administration information has not received continuously for eight number of times and for the first time, a transmission part 17 is started up, and at the communication equipment 1b to which an echo signal is sent, when it is operated normally, the transmission part 17 is started up, and an echo response signal is returned to a communication equipment 1a, and when it is in a down state, the echo response signal is not returned.
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