| 摘要 |
<p>[Problem] To provide a communication system or the like that makes it possible to use a plurality of backup communication paths at low cost. [Solution] In a communication system (1) for performing data transfer through a plurality of communication paths (31, 32) between a plurality of communication devices (10, 20), a plurality of protection groups are formed, each of the protection groups being a set of an active system, which is the communication path that is normally used, and a backup system, which is the communication path that is used when a fault has occurred in the active system. When a fault occurs in both the active system and the backup system of the first protection group, the communication device uses the backup system of the second protection group as a temporary substitute for the first protection group.</p> |
