Optical Network Unit

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Optical network unitOptical network unitOptical network unitOptical network unitFrom Wikipedia, the free encyclopedia

An optical network unitoptical network unitoptical network unitoptical network unit (ONUONUONUONU) is a device that transforms incoming optical signals into electronicsat a customers premises in order to provide telecommunications services over an optical fi!er

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An ONU is a generic term denoting a device that terminates any one of the endpoints of a fi!er to

the premises network, implements a passive optical network (/ON) protocol, and adapts /ON/%Us to su!scri!er service interfaces"0$12n some conte.ts, an ONU implies a multiple su!scri!erdevice" An optical network terminal (ON3) is a special case of an ONU that serves a singlesu!scri!er"

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ONU provides the su!scri!ers with !road!and 2nternet access"

ONU also provides the su!scri!ers with 2/ 3riple play application"

An ONU is used in com!ination with an optical line terminal (O43)"

Optical network unit closureOptical network unit closureOptical network unit closureOptical network unit closure

An ONU closure is a mechanical compartment that houses the ONU e5uipment" 3he outer closurefaces the outside environment and provides physical, mechanical, and environmental protectionfor ca!le (fi!er and copper) components or e5uipment housed within it"

An ONU system consists of a closure that is a metallic or non6metallic enclosure that providesphysical and environmental protection for the active electronic, optoelectronics, and passiveoptical components it houses" 2t terminates optical fi!ers from the O%N and processes the signalsto and from the #ustomer /remises -5uipment (#/-)" 2t is the N- that provides the tariffed

ical network unit 6 Wikipedia, the free encyclopedia http788en"wikipedia"org8wiki8Optical9network9unit

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telecommunications as well as video service interfaces for multiple residential and small !usinesscustomers"

ervices on the customer side of the ONU are communicated over metallic twisted pairs andcoa.ial ca!le drops (in the future, possi!ly fi!er ca!le or wireless) to a Network 2nterface (N2)where they are handed off to the customered entry""

/rimary power for ONUs is derived from either an e.ternal %# or an e.ternal A# power source"?ack6up power for ONUs can either !e derived from an e.ternal power source or !e internal to the

ONU closure and !e provided !y the F234 system supplier" /rimary power and e.ternal !ack6uppower can !e delivered to ONUs over either copper twisted pairs or coa.ial ca!le facilities" 3heseca!le facilities are commonly referred to as the 3#"

%eployment of an ONU system re5uires access to the fi!er distri!ution ca!le, 3#, and metalliccustomer drop wires" When access to these ca!les is provided internal to the ONU closure (i"e", !ylooping each ca!le through the closure), it is necessary that the ONU closure also provide splicingand storage facilities for each of these ca!les"

3elcordia @+6;*:, @eneric +e5uirements for Optical Network Unit (ONU) #losures and ONUystems(http788telecom6info"telcordia"com8site6cgi8ido8docs"cgi2%B-A+#CD%O#U=-N3B@+6

;*:D), contains complete proposed specifications for the ONU closures and systems"

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EEEE @";" 7 @iga!it6capa!le passive optical networks (@6/ON)7 ON3 management and control interface

specification (http788www"itu"int8rec836+-#6@";"6&:::&62) page , section ' definitions, accessed

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ONUONUONUONU on @oogle 2mages (http788images"google"com"pk

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+etrieved from Hhttp788en"wikipedia"org8w8inde."phptitleBOptical9network9unitD

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#ategories7 Network architecture Fi!er6optic communications

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Optical Network Unit

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