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PON (Passive Optical Network)
Jan 11, 2019

PON (Passive Optical Network)

 

PON (Passive Optical Network). PON (passive optical network) means that (in the optical distribution network) does not contain any electronic devices and electronic power supplies. The ODNs are all composed of passive components such as splitters, and do not require expensive active electronic devices.

 

PON (Passive Optical Network)


PON (Passive Optical Network). PON (passive optical network) means that (in the optical distribution network) does not contain any electronic devices and electronic power supplies. The ODNs are all composed of passive components such as splitters, and do not require expensive active electronic devices. A passive optical network consists of an optical line termination (OLT) installed at the central control station and a set of associated optical network units (ONUs) installed at the customer premises. The Optical Distribution Network (ODN) between the OLT and the ONU contains optical fibers as well as passive optical splitters or couplers.

 

The PON system is mainly composed of an optical line terminal (OLT: Optical Line Terminal) of the central office, an optical distribution network (ODN: Optical Distribution Network) including passive optical components, and an optical network unit/optical network terminal (ONU/ONT Optical) at the user end. Network Unit / Optical Network Terminal), the difference is that the ONT is directly at the user end, and there are other networks between the ONU and the user, such as Ethernet) and the network element management system (EMS), which is usually point-to-multipoint. Tree topology.

 

The outstanding advantage of the PON network is the elimination of outdoor active devices, all signal processing functions are done in the switch and in the user's home equipment. Moreover, the initial investment of this access method is small, and most of the funds are deferred until the user actually accesses. Its transmission distance is shorter than that of the active fiber access system, and the coverage range is small, but its cost is low, no need to set up a separate machine room, and maintenance is easy. Therefore, this structure can economically serve home users.


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