| 摘要 |
<p>A system for monitoring the transmission of a digital code is disclosed wherein a block consisting of a predetermined number of bits is extracted at a predetermined cycle from an information pulse train before the bit rate conversion thereof so that a check code corresponding to the states of this block may be formed, and inserted into the time slots formed by the bit rate conversion of the information pulse train, and the check code with the information pulse train after bit rate conversion, is transmitted to a receiving equipment. In the receiving equipment, a check code is formed from the received information pulse train, whose bit rate is restored to its original rate, in a manner exactly similar to that used in the transmitting equipment and is compared with the transmitted check code, that is, the check code is extracted from the received pulse train. Therefore, the whole transmission system including the channel before a bit rate converter in the transmitting equipment and the channel after a bit rate converter in the receiving equipment may be monitored.</p> |
