| 摘要 |
PROBLEM TO BE SOLVED: To increase the transmission band while reducing the cost of laying or removal, when forming a redundant root between slave station devices in a section having a master station device and a transmission line fault, via a slave station device in a section not having a transmission line fault, in order to deal with a transmission line fault between a master station device and a slave station device.SOLUTION: For a transmission line fault place D in a section between a PS 2 and a slave station device 3-2 in the redundant communication system, the slave station device 3-2 in a section having a transmission line fault includes a redundant route R for communicating with a master station device 1 sequentially via an optical space transmitter/receiver 6-2 connected with the slave station device 3-2 in a section having a transmission line fault, an optical space transmitter/receiver 6-3 connected with a slave station device 3-3 in proximity with the slave station device 3-2 in a section having a transmission line fault, and the slave station device 3-3. |
