| 摘要 |
PURPOSE:To eliminate the need for a complicated timing system circuit with a few number of signal lines even for kinds of faults by transferring an alarm signal while being inserted to a frame synchronizing signal position of a data after acquisition of frame synchronism. CONSTITUTION:Alarm signals 10-1-10-n are subjected to multiplexing at a multiplexing circuit 4 in synchronizing with an output of a counter 3, the alarm signals 10-1-10-n are arranged to a position corresponding to a frame synchronism signal region and the result is inputted to an OR circuit 6. On the other hand, an inhibiting circuit 5 inhibits an output of the position of the frame synchronism signal region of an input data by an output of the counter 3 and the output of the circuit 5 is inputted to the OR circuit 6. The output of the OR circuit 6 becomes a signal where the frame synchronism signal region is subjected to insertion of the alarm signals 10-1-10-n by said two inputs and the result is transmitted to the other section. An alarm transmission circuit of the other section extracts a corresponding alarm signal by using an output of the counter 7 from the transmitted signal respectively and raises an alarm signal. Thus, two signals lines are enough for signal lines between the reception circuit and the other section and no complicated timing system circuit is required. |
