| 摘要 |
PURPOSE:To set the length of an elastic memory for the frame synchronizing purpose similar in the case of application of the electric wire, by forming a junctor having a length with which the use of an electric wire is impossible with an optical fiber to cause a delay equivalent to one frame. CONSTITUTION:An optical junctor using an optical fiber is constituted with an optical transmitting circuit 1, an optical fiber 2, an optical receiving circuit 3 and a delay circuit 4. While a junctor using an electric wire is constituted with a transmitting circuit 5, an electric wire 6 and a receiveing circuit 7 respectively. The delay time of the circuit 4 is set so that the delay time from an input terminal 10 to an output terminal 41 of the optical junctor is equal to the value obtained by adding the delay time equivalent to one frame to the delay time from an input terminal 10 to an output terminal 71 of the junctor using the electric wire. Thus the length of an elastic memory (not shown in the diagram) for frame synchronization and connected to both junctors can be reduced like a junctor circuit using only the electric wire. |
