GPON technology is also a part of this increasingly popular network architecture. Before getting on with GPON, an introduction would do just fine, as where it came from. EPON (Ethernet Passive Optical Networks) or GPON (Gigabit Ethernet Passive Optical Networks), also known as Ethernet PON is an IEEE/EFM standard for using Ethernet for packet data, as defined in IEEE 802.3ah. It defines how Ethernet can be transmitted over new media types and in our context point to multipoint fiber. EPON/GPON technology is a fast Ethernet over passive optical networks which are point to multipoint fiber to the premises (FTTP)/fiber to the home (FTTH) architecture in which single optical fiber is used to serve multiple premises or users. A ‘PON’ architecture consists of an Optical Line Termination (OLT) on the provider’s side and one or many Optical Network Units (ONU) on the users’ side. This type of architecture is always better than the point to point ones. These are fast replacing existing technologies as DSL or cable modems as EPON/GPON are capable of providing bandwidths of up to 1 gigabit and beyond and also serve multiple purposes at a time.