| 摘要 |
<p>PROBLEM TO BE SOLVED: To shorten the restoration time at the time of dada transfer abnormality in comparison with a conventional device. SOLUTION: In a data transmission device 2, a threshold of the counted number of HEC error signals, which is the condition of output of a resynchronizing trigger signal in an HEL counter part 233. When a reception data signal is received, an HEC error is detected by an HEC detection part 232 at each time of receiving a reception ATM cell, and the resynchronizing trigger signal is outputted when the HEC error exceeds the preliminarily set threshold, and a resynchronous detection part 25 generates a synchronization start signal again based on the resynchronizing trigger signal, and a synchronizing signal from an RX signal is detected again from a switching part 262, and synchronization is started again to restore the normal state in order to obtain the reception data signal from the RX signal, and thus the restoration time at the time of data transfer abnormality is made shorter than that in a conventional device.</p> |
