Fiber to the x (FTTX; also spelled "Fibre") or fiber in the loop is a generic term for any broadband network architecture using optical fiber to provide all or part of the local loop used for last mile telecommunications.
EPON stands for Ethernet passive optical network. EPON uses Ethernet packets instead of ATM (Asynchronous Transfer Mode) cells. EPON also uses Internet Protocol (IP) to carry data, voice, and video data.It generally delivers 1G symmetrical bandwidth, which makes it a popular choice.
GPON stands for Gigabit Passive Optical Networks. GPON is a point-to-multi point access mechanism. Its main characteristic is the use of passive splitters in the fibre distribution network, enabling one single feeding fibre from the provider's central office to serve multiple homes and small businesses.
A passive optical network is a fiber-optic telecommunications technology for delivering broadband network access to end-customers.
GEPON or EPON (Ethernet PON) is an IEEE standard that uses Ethernet for sending data packets. In current there are 15 million EPON ports installed. GEPON uses 1 gigabit per second upstream and downstream rates.