Summary

Recommendation ITU-T G.9805 presents three methods for the coexistence of multiple passive optical network (PON) generations on a common optical distribution network (ODN): coexistence element (CE), multi-PON module (MPM), and splitter‑based. These methods allow the reuse of already deployed fibre and splitters when evolving a legacy PON to a higher capacity. Methods for calculating required isolation for coexistence element, filter considerations for higher speed passive optical network (HSP) and asymmetric / symmetric 10-Gigabit passive optical network optical line termination or XG(S)-PON OLT, and optical interface parameters for gigabit-capable passive optical network (G-PON) and XG(S)‑PON MPM supporting classes B+, C+ and D optical path loss (OPL) are also described.

Amendment 1 includes additional 3-gen PON systems coexistence methods, and crosstalk analysis between PON systems.