Recommendation ITU-T G.9802 describes the general requirements and architecture of multiple wavelength Passive Optical Network (PON) systems. It specifies the mechanism of wavelength assignment, wavelength tuning, and wavelength maintenance in multiple wavelength PON systems. The functionalities of wavelength resource management and wavelength channel performance monitoring and supervision are also included within the scope of this Recommendation. The specifications in this Recommendation can be applied to various types of multiple wavelength PON systems.