Abstract: An access optical node includes an optical signal processing unit that transmits a received optical signal to a destination node. The optical signal processing unit includes a path switching unit that switches between a first path for transmitting the received optical signal to the destination node as it is as an optical signal, and a second path for transmitting the received optical signal to an electric signal processing unit and transmitting the optical signal processed by the electric signal processing unit to the destination node.

Abstract: A communication system includes a plurality of roadside units installed in respective areas that acquires travel information about a vehicle through radio communication, and a first terminal to which the plurality of roadside units is connected. The roadside units and the first terminal each include a routing processing unit, implemented by software. The routing processing unit performs a communication process in line with a routing table updated based on the travel information.

Abstract: A communication system includes: a plurality of roadside units installed in respective areas that acquires travel information about a vehicle through radio communication; a first terminal connected to the plurality of roadside units; and a server that executes control as a control plane to acquire the travel information from the roadside unit, predict the roadside unit belonging to the plurality of roadside units and installed in an intended area where the vehicle is predicted to travel and predict arrival time at the intended area based on the acquired travel information, and manage communication through the roadside unit and the first terminal so as to construct a communication path between the predicted roadside unit and the first terminal before the arrival time.