| 摘要 |
PURPOSE:To prevent a transmission delay time at fault from being increased by constituting the system so that each node receives a signal from one of active and spare transmission lines and the signal is transmitted to both the active and spare transmission lines. CONSTITUTION:Five nodes 11-15 are connected by the active loop transmission line 16 and the spare loop transmission line 17. Each node receives a signal from a reception section able to receive a carrier in an active reception section R connected to the active loop transmission line 16 and a spare reception section R' connected to the spare loop transmission line 17, regenerates it and transmits respectively it to the active loop transmission line 16 and the spare loop transmission line 17 from both an active transmission section S and a spare transmission section S'. When no fault takes place in the loop transmission lines 16, 17, each node selects the active reception section R as the reception use. |
