| 摘要 |
In a data transmission system comprising, for example, a facsimile transmitter connected to a facsimile receiver through a public telephone network, failure or malfunction sensors are provided at the transmitter and receiver which generate failure signals having the same frequency as the telephone network busy signal upon detection of a malfunction. Both the transmitter and receiver reset at high speed to an initial ready-for-transmission status upon reception of a failure signal from either sensor and automatically disconnect from the telephone network. The failure sensor at the receiver preferably comprises means for generating a failure signal when the failure rate of parity or other digital checks exceeds a predetermined value.
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