BSNL Fiber Optic experience way to crazy for india » FTTH_bsnl

Passive Optical Network (PON)

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A passive optical network (PON) is a point-to-multipoint, fiber to the premises network architecture in which unpowered optical splitters are used to enable a single optical fiber to serve multiple premises, typically 16-128. A PON consists of an optical line terminal (OLT) at the service provider’s central office and a number of optical network units (ONUs) near end users. A PON reduces the amount of fiber and central office equipment required compared with point to point architectures. A passive optical network is a form of fiber-optic access network.

Downstream signals are broadcast to all premises sharing multiple fibers. Encryption can prevent eavesdropping.

Upstream signals are combined using a multiple access protocol, usually time division multiple access (TDMA). The OLTs “range” the ONUs in order to provide time slot assignments for upstream communication.

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 organisations 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.

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