Transmission network system

A transmission network comprising a transmission node and a receiving node, wherein a path is set between said transmission node and said receiving node and a transmission signal of a higher-order group signal including a lower-order group signal is transmitted between the nodes, wherein

• said transmission node comprises:
• a first path-setting-receiving section for receiving a content of a change in a path setting when said path setting to be applied to said transmission signal is changed;
• a transmission-path-setting change section for changing a path setting of said transmission node based on said content received by said first path-setting-receiving section;
• and
• a change insertion section for reporting information about said content of the change in path setting received by said path-setting-receiving section to said receiving node by inserting said information into said transmission signal to be transmitted from said transmission node to said receiving node;
• and wherein
• said receiving node comprises:
• a second path-setting-receiving section for receiving information about said change in path setting inserted into said transmission signal from said transmission node;
• and
• a receiving-path-setting change section for changing a path setting of a node based on said information about said change in path setting received by said second path-setting receiving section, wherein,
• said transmission-path setting change section comprises:
• a crossconnect processing section that subjects a low-order group signal to crossconnect processing based on a crossconnect setting to define a transmission path of the low-order group signal to be transmitted to said receiving node;
• and
• a crossconnect command section that commands said crossconnect processing section to change the crossconnect setting based on the change in the path setting received by said first path-setting-receiving section.