| 摘要 |
PURPOSE:To send alarm even when the input of a signal without inserting a frame synchronizing signal is interrupted by sending alarm in receiving an output from a detection section or said output and an output from synchronizing section are inputted in an equipment including the input interruption detection section and the frame synchronizing section. CONSTITUTION:A frame synchronizing alarm circuit 9 sends a frame synchronizing alarm in receiving the output from the input interruption detection section 7 or said output and an output from the frame synchronizing section 8 are inputted. When a channel without inserted frame bit has an error and the input is interrupted, an input interruption alarm from the detection circuit 7 is fed to the alarming circuit 9, from which a frame synchronizing alarm is sent. Thus, when a fault takes place in the channel and the input alarm is sent, the frame synchronizing alarm is sent simultaneously and two states are eliminated. Thus, the 2-state of the frame synchronizing alarm of a multi-value QAM is eliminated. |
