| 摘要 |
<p>PURPOSE:To prevent out of synchronism even during data transfer by providing a scrambler circuit and an AND gate to a data terminal equipment and a discrambler circuit and a timing extraction circuit to a data exchange. CONSTITUTION:A transmission data of a data terminal equipment 1 is given to a scrambler circuit 17 in the bit timing and scrambled. The scrambled signal is given to an AND gate 13 and outputted to a subscriber line 13 via a line driver 14 in a not modified form except at calling. The data sent to a data exchange 2 is received by a line receiver 21. The reception data is inputted to a discrambler circuit 29 and a timing extraction circuit 30. The received data is restored to the original data by the circuit 29 and outputted to a reception data output terminal 22. Moreover, the reception data before descrambled included timing information and the bit timing is extracted stably by the timing extraction circuit 30. Thus, the synchronization between the equipment 1 and the exchange 2 is ensured.</p> |
