| 摘要 |
A facsimile machine, which is an analog communication terminal connected to a facsimile machine of another end via an IP network, monitors a silence generating interval by detecting energy of a signal received from the facsimile machine of the other end. When a silent state generates periodically, the facsimile machine judges that the communication is abnormal caused by a packet loss. When the communication is judged to be abnormal, the communication is interrupted or the communication speed is decelerated.
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