| 摘要 |
PURPOSE:To execute effectively an optical branching by using a terminal operating signal sent through an exclusive optical transmission line from a signal generating circuit of a terminal equipment, detecting the abnormality or unoperation of the terminal equipment, executing the separation of a terminal and a circuit by itself, and providing an optical repeating function. CONSTITUTION:In case when a terminal operating signal deciding circuit 7 receives the optical signal of a prescribed form in a branching device 1, a switching signal for transmitting a signal to a side A is applied to a signal direction swithcing circuit 8; and in other case, a swithcing signal for transmitting a signal to a side B is applied. The signal transmitted to the side A in this circuit 8 passes through an electric signal-terminal optical signal transducer 10 and a terminal use optical signal line 4, and it is inputted to a terminal equipment 3. Subsequently, an optical signal from the equipment 3 passes through the signal line 4, is inputted to the branching device 1, converted to an electric signal by a terminal optical signal-electric signal transducer 11, and thereafter, passes through the circuit 8, becomes an optical signal again by an electric signal- circuit optical signal transducer 12, and it is sent out to an optical circuit 2. |
