Transmission device, transmission method, and program

A transmission method using a transmission device that includes a storage unit storing identification information of a multiplexing unit performing time division multiplexing on an including frame which is an ODU frame including a client signal for each type of the client signal, multiplexes the client signal, and transmits the multiplexed client signal to another device, the transmission method comprising:

• generating, by an including unit, an including frame of a predetermined format in which an input client signal is included in a payload portion;
• outputting, by a cross connecting unit, the including frame generated by the including unit to the multiplexing unit represented by identification information stored in the storage unit in association with the format of the including frame;
• multiplexing, by each of a plurality of multiplexing units, the including frame input from the cross connecting unit into a transmission frame which is an ODU frame of a predetermined format by time division multiplexing;
• transmitting, by a transmission frame transmitting unit, the transmission frame multiplexed by the multiplexing unit to another device;
• when one of the multiplexing units has a problem,
• outputting, by the cross connecting unit, an including frame whose format matches a format of an including frame stored in the storage unit in association with identification information of the multiplexing unit having the problem among including frames generated by the including unit to a backup multiplexing unit;
• multiplexing, by the backup multiplexing unit, the including frame input from the cross connecting unit into a payload portion of a predetermined transmission frame by time division multiplexing;
• and
• transmitting, by a backup transmission frame transmitting unit, the transmission frame multiplexed by the backup multiplexing unit to another device.

A program causing a transmission device that multiplexes a plurality of client signals into an ODU frame, and transmits the ODU frame to another device to execute:

• an including unit that includes an input client signal in a payload portion, and generates an including frame which is an ODU frame of a predetermined format;
• a plurality of multiplexing units, each of which multiplexes an including frame generated by the including unit into a transmission frame of a predetermined format by time division multiplexing;
• a transmission frame transmitting unit that transmits the transmission frame multiplexed by the multiplexing unit to another device;
• a cross connecting unit that outputs the including frame generated by the including unit to the multiplexing unit represented by the identification information stored in a storage unit in association with the format of the including frame;
• a backup multiplexing unit that multiplexes the including frame in which the client signal is included by the including unit into a payload portion of a transmission frame of a predetermined format which is an ODU frame by time division multiplexing when one of the multiplexing units has a problem;
• and
• a transmission frame transmitting unit that transmits the transmission frame multiplexed by the backup multiplexing unit to another device,
• wherein the cross connecting unit outputs an including frame whose format matches a format of an including frame stored in the storage unit in association with identification information of the multiplexing unit having the problem among including frames generated by the including unit to the backup multiplexing unit when the multiplexing unit has the problem.