| 摘要 |
<p>PURPOSE:To obtain a general-purpose circuit detecting out of synchronism of synchronization data, issuing alarm and inhibiting generation of an out of synchronism alarm when data are all '1'. CONSTITUTION:An out of synchronism detection circuit 1 detects out of synchronism and a synchronization pattern location all '1' detection circuit 2 detects a state of synchronization pattern location all '1' and an all '1' state detection circuit 3 detects an all '1' state. A delay circuit 4 outputs an out of synchronism detection result 12 when a synchronization pattern location all '1' is not detected, and outputs an out of synchronism detection result 12 with a delay when the synchronization pattern location all '1' is detected. A generation inhibit circuit 5 outputs an out of synchronism information delay result 15 as an out of synchronism alarm 16 when the all '1' state is not detected and inhibits issuing of an out of synchronism alarm independently of the out of synchronism information delay result 15 when the all '1' state is detected.</p> |
