Control timing synchronization method, optical transmission system, and optical transmission apparatus

An optical transmission system comprising:

• a first optical transmission apparatus that acts as a transmitting end in a wavelength path;
• and
• a second optical transmission apparatus that receives an optical signal transmitted from the first optical transmission apparatus in the wavelength path, wherein
• the first optical transmission apparatus includes a processor that is configured to:
• generate a control process details notification signal giving notification of control process details, generate a control start timing notification signal,
• wait for a predetermined period, and
• set a process of the first optical transmission apparatus to a process that corresponds to the control process details,
• the first optical transmission apparatus superimposes on a main signal and transmits, the signal giving notification of the control process details;
• waits for a first period after transmitting the control process details notification signal;
• superimposes on the main signal and transmits, the control start timing notification signal after waiting for the first period;
• waits for a second period after transmitting the control start timing notification signal;
• and after waiting for the second period, switches a process of the first optical transmission apparatus to the set process,
• the second optical transmission apparatus includes a processor that is configured to:
• acquire information for giving notification of control process details, based on the control process details notification signal superimposed and transmitted on the main signal,
• determine a presence of a process for the second optical transmission apparatus, based on the acquired information,
• wait for detection of the control start timing notification signal superimposed and transmitted on the main signal,
• wait for a predetermined period, and
• set a process of the second optical transmission apparatus to a process that corresponds to the control process details, and
• the second optical transmission apparatus acquires the information;
• determines the presence of a process for the apparatus, based on the information;
• waits for detection of the control start timing notification signal, when a process for the second optical transmission apparatus is present;
• waits for the second period upon detecting the control start timing notification signal while waiting for detection of the control start timing notification signal, and after waiting for the second period, sets and executes the process that corresponds to the information.

An optical transmission apparatus comprising

• a processor that is configured to:
• generate a control process details notification signal giving notification of control process details;
• generate a control start timing notification signal;
• wait for a predetermined period;
• and
• set a process of the optical transmission apparatus to a process corresponding to the control process details, wherein
• the optical transmission apparatus superimposes on a main signal and transmits, the control process details notification signal;
• waits for a first period after transmitting the control process details notification signal;
• superimposes on the main signal and transmits, the control start timing notification signal after waiting for the first period;
• waits for a second period after transmitting the control start timing notification signal, and after waiting for the second period, switches a process of the optical transmission apparatus to the set process.