Gigabit Passive Optical Networks (GPON) -
(ITU-T G.984,
Gigabit PON
.) - GPON is an evolution of the BPON standard. It supports higher rates, enhanced security, and choice of Level 2 support (ATM, GEM, Ethernet).
https://en.wikipedia.org/wiki/GPON
Fiber Optic Passive Optical Networks (PON)
See the Interactive Television Institute.