Transmission apparatus and network protection method

A transmission apparatus comprising:

• a processor configured to recognize a number of failures in signal light in wavelengths on a network for transmission of wavelength-multiplexed signal light, and configured to perform path switching for each group of signal light in wavelengths that are different from each other and to select, when multiple failures occur, restoration processing on a basis of the number of failures.

A network protection method for a transmission apparatus, the method comprising:

• recognizing a number of working failures and a number of protection failures on a network for transmission of wavelength-multiplexed signal light, the number of working failures being the number of failures in signal light in wavelengths at a working entity and the number of protection failures being the number of failures in signal light in wavelengths at a protection entity;
• and
• performing, by a processor, path switching for each group of signal light in wavelengths that are different from each other and selecting, when multiple failures occur, restoration processing by which the number of paths restored is largest, on a basis of the number of working failures and the number of protection failures.