Abstract: A band calculation device (1) according to the present disclosure, in the band calculation device (1) which calculates a band of the link (L) of a relay network (NWR) which is constituted by nodes (N) and links (L) and which relays information transmitted and received between a plurality of communication bases, includes an input unit (21) that receives an input of topology information indicating ports (P) of nodes (N), connection destination ports of the ports (P), and links, respectively, path information indicating primary paths that relay the information when a failure does not occur, paths including backup paths that relay the information when the failure occurs in the primary path, and via transmission ports that are the ports (P) for transmitting the information in the paths, respectively, and traffic information indicating the port (P) and traffic statistic value of the port (P), respectively, and a calculation unit (22) that calculates a band of the link (L) on the basis of the topology information, t

Abstract: An object of the present invention is to provide a communication control device that can implement a redundant configuration of Act/Standby that does not require advanced control, at low cost, and is capable of high-speed switching in both switching from an active system to a standby system and switch-back from the standby system to the active system.

Abstract: An object of the present disclosure is to provide a communication system capable of constantly performing monitoring in conjunction with client signals regardless of switching due to a failure in a network.