Station side terminal device, subscriber side terminal device, optical communication system, route switching method, non-transitory computer readable medium storing route switching program, and wavelength switching method

A station side terminal device comprising:

• terminal devices each including:
• a buffer section including a through queue and one or more switch queues that temporarily store the packets;
• a subscriber side terminal device assignment section that, in cases in which route switching has occurred in a communication route that connects the station side terminal device and subscriber side terminal devices, causes unicast packets addressed to switching target subscriber side terminal devices and packets for switching targets that are addressed to all of the subscriber side terminal devices to be stored in one of the one or more switch queues, and causes unicast packets addressed to non-switching target subscriber side terminal devices and packets for non-switching targets that are addressed to all of the subscriber side terminal devices to be stored in the through queue;
• and
• a scheduler that reads packets that have been stored in the buffer section, and outputs the read packets to the connected subscriber side terminal device;
• and
• a terminal device assignment section that transmits the unicast packets, which are obtained from a higher level communication network to which the station side terminal device is connected, to a terminal device in which a subscriber side terminal device is registered as a destination of the unicast packets, and copies the packets addressed to all of the subscriber side terminal devices obtained from the higher level communication network and transmits the copied packets to one or more designated terminal devices.