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Gigabit Passive Optical Network

GPON means(Gigabit Passive Optical Network) uses optical wavelength division multiplexing (WDM) and fibre can be used for both downstream and upstream data. A laser on a wavelength (λ) of 1490 nm transmits downstream data. Upstream data transmits on a wavelength of 1310 nm. If TV is being distributed, a wavelength of 1550 nm is used.

GPON is a point-to-multipoint access mechanism. GPON also uses Advanced Encryption Standard for security. GPON also supports all types of ethernet protocols. It provides 2.5 GB/s downstream and 1.25 GB/s upstream bandwidth. GPON is the most popular used in a U.S


Ethernet Passive Optical Network

EPON means Ethernet Passive Optical Network developed by IEEE. Standard based on EPON 802.3ah specifies a similar passive network with in a range 20 km. EPON is a cable technology DSL and other broadband access solutions. It is most popular used in Asia and Europe.

This network used in a fibre optic cables. A packets with a single ptrotocol used in a internet access. Variable length packets upto 1518 bytes. EPON is very inexpensive to implement.

EPON can currently support speeds up to 1.25Gbit/second; advanced 10G-EPON technology, providing speeds up to 10Gbit/second. EPON utilizes an AES based encryption for both upstream and downsteeam