History
There are two major standard groups: the Institute of Electrical and Electronics Engineers (IEEE) and the Telecommunication Standardization Sector of the International Telecommunication Union (ITU-T). Both organizations produced separate and incompatible 1 Gigabit and 10 Gigabit standards. The Society of Cable Telecommunications Engineers (SCTE) also specified Radio Frequency over Glass for carrying HFC RF signals over a passive optical network.
Read more about this topic: Passive Optical Network