scope:

The purpose of this Recommendation is to establish the methods and parameters for passive optical network (PON) coexistence, where two or more PON systems share a common optical distribution network (ODN). For this purpose, this Recommendation defines and provides:

- a general reference diagram of coexistence element, and sample parameters of a discrete wavelength division multiplexing (WDM) filter that combines and isolates the gigabit-capable passive optical network (G-PON) up/down signals and enhancement bands of PON systems, radio frequency (RF) signal and optical time-domain reflectometer (OTDR) signal at the optical line termination (OLT) side;

- methods for calculating required isolation for WDM/CE/CEM devices;

- wavelength coexistence using M:N splitter;

- multi-PON module with integrated WDM;

- filter considerations for higher speed passive optical network (HSP) and XG(S)-PON/10G-EPON OLT.