Redes Aon - Pon Gpon - Epon

8/12/2019 Redes Aon - Pon Gpon - Epon

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Redes AON: Redes pticas activas (Active Optical Network)

Red ptica activa (Active Optical Network) AON, en la cual se utilizan elementos activos querequieren energa para su alimentacin y permiten largas distancias entre la sala de equipos ylos aonados!

"asado en el #tandard $%%% &'!a, las redes activas %ternet proveen de anco de andasim*trico con velocidades superiores a +ps por puerto sore una -nica .ira utilizando paraello dos longitudes de onda multiple/adas y di.erenciadas sore cada .ira ptica! 0e *sta

manera con cada longitud de onda tenemos dos slots de transmisin, un slot se utiliza comocanal de transmisin y otra para el canal de recepcin!

%sto nos permite una transmisin de datos 1ull20-ple/ mediante una cone/in punto a puntocon un anco de anda dedicado al usuario!

%n las redes 3ON de.ine como m4/ima distancia entre un O56 y un equipo ON7 de ' 8m paraque la red 3ON sea operativa, con las redes %ternet activas *ste lmite desaparecepermiti*ndose distancias superiores a &'8m desde el punto de distriucin asta el usuario!


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Whats The Difference Between !ON And "!ON Optical #i$erNetworks%

http://electronicdesign.com/what-s-difference-between/what-s-difference-between-epon-and-gpon-optical-fiber-networks

Jan. 6, 2014&o' #renel| Electronic Design

3assive optical networks de.ined and e/plained! %3ON and 3ON are introduced and compared!

%3ON and 3ON are popular versions o. passive optical networks (3ONs)! 6ese sort2aulnetworks o. .ier2optical cale are used .or $nternet access, voice over $nternet protocol (9o$3),and digital 69 delivery in metropolitan areas! Oter uses include ackaul connections .orcellular asestations, :i21i otspots, and even distriuted antenna systems (0A#)! 6e primarydi..erences etween tem lie in te protocols used .or downstream and upstreamcommunications!

!assive Optical Networks

A 3ON is a .ier network tat only uses .ier and passive components like splitters andcominers rater tan active components like ampli.iers, repeaters, or saping circuits! #uc

networks cost signi.icantly less tan tose using active components! 6e main disadvantage is asorter range o. coverage limited y signal strengt! :ile an active optical network (AON) cancover a range to aout +'' km (; miles), a 3ON is typically limited to .ier cale runs o. up to' km (+ miles)! 3ONs also are called .ier to te ome (166


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tat divide a single optical signal into multiple equal ut lower2power signals, distriute tesignals to users! An optical network unit (ON7) terminates te 3ON at te customer?s ome!6e ON7 usually communicates wit an optical network terminal (ON6), wic may e aseparate o/ tat connects te 3ON to 69 sets, telepones, computers, or a wireless router!6e ON7ON6 may e one device!

$n te asic metod o. operation .or downstream distriution on one wavelengt o. ligt .romO56 to ON7ON6, all customers receive te same data! 6e ON7 recognizes data targeted ateac user! 1or te upstream .rom ON7 to O56, a time division multiple/ (60@) tecnique is

used were eac user is assigned a timeslot on a di..erent wavelengt o. ligt! :it tisarrangement, te splitters act as power cominers! 6e upstream transmissions, called urst2mode operations, occur at random as a user needs to send data! 6e system assigns a slot asneeded! "ecause te 60@ metod involves multiple users on a single transmission, teupstream data rate is always slower tan te downstream rate!

"!ON

Over te years, various 3ON standards ave een developed! $n te late +BB's, te$nternational 6elecommunications 7nion ($67) created te A3ON standard, wic used teAsyncronous 6rans.er @ode (A6@) .or long2aul packet transmission! #ince A6@ is no longerused, a newer version was created called te roadand 3ON, or "3ON! 0esignated as $6726

!B&C, tis standard provided .or ; @itss downstream and +DD @itss upstream!

:ile "3ON may still e used in some systems, most current networks use 3ON, or igait3ON! 6e $6726 standard is !B&E! $t delivers !E&& itss downstream and +!EE itssupstream!

3ON uses optical wavelengt division multiple/ing (:0@) so a single .ier can e used .orot downstream and upstream data! A laser on a wavelengt (F) o. +EB' nm transmitsdownstream data! 7pstream data transmits on a wavelengt o. +C+' nm! $. 69 is eingdistriuted, a wavelengt o. +DD' nm is used!

:ile eac ON7 gets te .ull downstream rate o. !E&& itss, 3ON uses a time division

multiple access (60@A) .ormat to allocate a speci.ic timeslot to eac user! 6is divides teandwidt so eac user gets a .raction suc as +'' @itss depending upon ow te serviceprovider allocates it!

6e upstream rate is less tan te ma/imum ecause it is sared wit oter ON7s in a 60@Asceme! 6e O56 determines te distance and time delay o. eac suscrier! 6en so.twareprovides a way to allot timeslots to upstream data .or eac user!

6e typical split o. a single .ier is +GC or +G;E! 6at means eac .ier can serve up to C or;E suscriers! #plit ratios up to +G+& are possile in some systems!

As .or data .ormat, te 3ON packets can andle A6@ packets directly! Recall tat A6@packages everyting in DC2yte packets wit E& .or data and D .or overead! 3ON also uses ageneric encapsulation metod to carry oter protocols! $t can encapsulate %ternet, $3, 6>3,703, 6+%+, video, 9o$3, or oter protocols as called .or y te data transmission! @inimumpacket size is DC ytes, and te ma/imum is +D+&! A%# encryption is used downstream only!

6e latest version o. 3ON is a +'2igait version called H3ON, or +'23ON! As te demand.or video and over te top (O66) 69 services as increased, tere is an increasing need to oostline rates to andle te massive data o. ig2de.inition video! H3ON serves tis purpose! 6e$67 standard is !B&I!

H3ON?s ma/imum rate is +' itss (B!BDC&) downstream and !D itss (!E&&C)upstream! 0i..erent :0@ wavelengts are used, +DII nm downstream and +I' nm upstream!6is allows +'2its service to coe/ist on te same .ier wit standard 3ON! Optical split is

+G+&, and data .ormatting is te same as 3ON! @a/imum range is still ' km! H3ON is notyet widely implemented ut provides an e/cellent upgrade pat .or service providers andcustomers!


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ost !ONs are confi*'red like this+ The n',$er of splitters and split levels varieswith the vendor and the s-ste,+ .plit ratios are 's'all- /:01 or /:23 $'t co'ld $ehi*her+

!ON

6e $nstitute o. %lectrical and %lectronic %ngineers ($%%%) developed anoter newer 3ONstandard! "ased on te %ternet standard &'!C, %3ON &'!Ca speci.ies a similar passivenetwork wit a range o. up to ' km! $t uses :0@ wit te same optical .requencies as 3ONand 60@A! 6e raw line data rate is +!D itss in ot te downstream and upstream

directions! =ou will sometimes ear te network re.erred to as igait %ternet 3ON or %3ON!

%3ON is .ully compatile wit oter %ternet standards, so no conversion or encapsulation isnecessary wen connecting to %ternet2ased networks on eiter end! 6e same %ternet.rame is used wit a payload o. up to +D+& ytes! %3ON does not use te >#@A>0 accessmetod used in oter versions o. %ternet! #ince %ternet is te primary networking tecnologyused in local2area networks (5ANs) and now in metro2area networks (@ANs), no protocolconversion is needed!

6ere is also a +'2its %ternet version designated &'!Cav! 6e actual line rate is +'!C+Ditss! 6e primary mode is +' itss upstream as well as downstream! A variation uses +'itss downstream and + its upstream! 6e +'2its versions use di..erent optical

wavelengts on te .ier, +DID to +D&' nm downstream and +;' to +&' nm upstream so te+'2its system can e wavelengt multiple/ed on te same .ier as a standard +2itssystem!

.',,ar-

6elecommunications companies use 3ONs to provide triple2play services including 69, 9o$3pone, and $nternet service to suscriers! 6e ene.it is muc iger data rates tat areessential to video distriution and oter $nternet services! 6e low cost o. passive componentsmeans simpler systems wit .ewer components tat .ail or require maintenance! 6e primarydisadvantage is te sorter range possile, commonly no more tan ' km or + miles! 3ONsare growing in popularity as te demand .or .aster $nternet service and more video grows!

3ON is te most popular in te 7!#!, suc as 9erizon?s 1oist system! %3ON systems are moreprevalent in Asia and %urope!


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!ON vs+ "!ON: A !ractical 4o,parisonOnn 5aran6 !assav7 Technolo*iesttpGwww!eetimes!comdocument!aspJdocKidL+I';;

$ncreasingly competing wit copper as te in.rastructure .or access networks, .ier is makingrapid eadway in te worldMs leading tecnology2adopter markets! :it passive2optical2networking (3ON) tecnology gaining popularity, two point2to2multipoint standards %ternet

passive optical networking (%3ON) and A6@2ased roadand passive optical networking("3ON) are ot in active deployment! @eanwile, industry oservers view A6@2asedigait passive optical networking (3ON) as te eventual successor to "3ON, anticipating tatmass deployment is at least two years away! 3ON de.ines a completely new protocol designedto support multiple services in teir native .ormats!

O.ten seen as a replacement tecnology .or traditional roadand solutions suc as 0#5 orcale2modem, 3ON, in its various .lavors, promises andwidts o. up to one gigait andeyond! A6@2ased passive optical networking (A3ON), and susequently "3ON, got an earlystart, wit te $nternational 6elecommunication 7nionMs ($67) rati.ication o. te !B&Cstandard! $n Panuary ''C, $67 rati.ied 3ON, ut it as not yet reaced te deployment stage!

@eanwile, in Pune ''E, te $%%% rati.ied %3ON as te $%%%&'!Ca standard! #ince ten, itas een rapidly adopted in Papan! %3ON is also gaining momentum wit carriers in >ina,8orea, and 6aiwan!

:ile 3ON promoters argue tat te $67 standard is approacing maturity .aster tan te$%%% %3ON standard, %3ON advocates cite te recent emergence o. te $%%% standard,deployments o. %3ON underway, and announced deployment plans y carriers as strongevidence o. %3ONMs acceptance! Additionally, %3ON partisans note tat most data egins andends its li.e as $3%ternet tra..ic, and tey ask te question, wy interpose still anoterprotocol encapsulationJ

As you can see .rom aove, te deate over %3ON and 3ON runs deep! $n tis article, weMllprovide a practical comparison o. te two tecnologies! 5etMs start y looking at te keydi..erences etween te two tecnologies and e/amine te strengts o. eac protocol!

"!ON and !ON Differences3eraps te most dramatic distinction etween te two protocols is a marked di..erence inarcitectural approac! 3ON provides tree 5ayer networksG A6@ .or voice, %ternet .ordata, and proprietary encapsulation .or voice! %3ON, on te oter and, employs a single 5ayer network tat uses $3 to carry data, voice, and video!

A multiprotocol transport solution supports te 3ON structure(#i*'re /)! 7sing A6@

tecnology, virtual circuits are provisioned .or di..erent types o. services sent .rom a centralo..ice location primarily to usiness end users! 6is type o. transport provides ig2qualityservice, ut involves signi.icant overead ecause virtual circuits need to e provisioned .oreac type o. service! Additionally, 3ON equipment requires multiple protocol conversions,segmentation and reassemly (#AR), virtual cannel (9>) termination and point2to2pointprotocol (333)!
http://www.eetimes.com/document.asp?doc_id=1272066&http://www.eetimes.com/document.asp?doc_id=1272066http://www.eetimes.com/document.asp?doc_id=1272066&http://www.eetimes.com/document.asp?doc_id=1272066


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Figure 1: Diagram shoing a t!"ical #$%& netor'.

%3ON provides seamless connectivity .or any type o. $32ased or oter packetizedcommunications (#i*'re 1)! #ince %ternet devices are uiquitous .rom te ome network allte way troug to regional, national and worldwide ackone networks, implementation o.%3ONs can e igly cost2e..ective! 1urtermore, ased on continuing advances in te trans.errate o. %ternet2ased transport now up to +' igait %ternet %3ON service levels .orcustomers are scalale .rom 6+ (+!D @its) up troug + its!

Figure 2: Diagram shoing a t!"ical E$%& netor'.

4o,parisons and 4ontrasts>learly, tere are some distinct di..erences etween %3ON and 3ON at 5ayer !


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delivers +2its symmetrical andwidt! %3ONMs igait %ternet service actually constitutes +its o. andwidt .or data and D' @its o. andwidt .or encoding! 6e approac o. %3ON,as part o. te igait %ternet standard, parallels tat o. 1ast %ternet, wic also uses Dpercent .or encoding!

3ONMs +!D2it service speci.ies a usale andwidt o. +!D its, wit no requirement .orencoding! :ill te additional D' @its promised y 3ON promoters stand as a clearadvantage .or 3ONJ 6e answer may lie not in te seer andwidt comparisons, ut in te

practicality o. +!D2it uplinks!

igait %ternet inter.aces to te aggregation switc, central o..ice, and metro are currently tecost2e..ective way to aggregate +2it ports .or transport! :it no cost2e..ective switces .or+!D it availale, te added andwidt promised y 3ON, altoug measurale, could comeat a signi.icant premium over te price o. %3ON equipment! $n oter words, te low2cost uplink.or te .oreseeale .uture is likely to e igait %ternet, wic is te e/act it rate o. %3ON! $ntat ligt, 3ONMs added andwidt may not prove advantageous .or carriers!

2. Reach

:it eiter protocol, te practical limitation to reac comes .rom te optical2link udget! :itte reac o. ot protocols currently speci.ied at appro/imately ' kilometers, te di..erence insplit rates te numer o. optical network units (ON7s) supported y one optical line terminal(O56) is a point o. di..erentiation!

3ON promises to support up to +& ON7s! :it te %3ON standard, tere is no limit on tenumer o. ON7s! 0epending on te laser diode amplitude, wen using low2cost optics, %3ONcan typically deliver C ON7s per O56, or ;E wit .orward error correction (1%>)!

3. Per-subscriber costs

6e use o. %3ON allows carriers to eliminate comple/ and e/pensive A6@ and #onet elementsand to simpli.y teir networks, terey lowering costs to suscriers! >urrently, %3ONequipment costs are appro/imately +' percent o. te costs o. 3ON equipment, and %3ON

equipment is rapidly ecoming cost2competitive wit 90#5!

4. Efficiencies of Each Standard

:it ot 3ON protocols, a .i/ed overead is added to convey user data in te .orm o. a packet!$n %3ONs, data transmission occurs in variale2lengt packets o. up to +D+& ytes according tote $%%% &'!C protocol .or %ternet! $n A6@2ased 3ONs, including 3ONs, data transmissionoccurs in .i/ed2lengt DC2yte cells (wit E&2yte payload and D2yte overead) as speci.ied yte A6@ protocol! 6is .ormat makes it ine..icient .or 3ONs to carry tra..ic .ormatted accordingto $3, wic calls .or data to e segmented into variale2lengt packets o. up to ;D,DCD ytes!

1or 3ONs to carry $3 tra..ic, te packets must e roken into te requisite E&2yte segmentswit a D2yte eader .or eac! 6is process is time2consuming and complicated and adds costto te central2o..ice O56s as well as te customer premise2ased ON7s! @oreover, D ytes o.andwidt are wasted .or every E&2yte segment, creating an onerous overead tat iscommonly re.erred to as te A6@ cell ta/! (6is is te case wit 3ONMs A6@ encapsulationmode! $n its oter encapsulation mode, called %@, te A6@ cell ta/ does not apply!)

"y contrast, using variale2lengt packets, %ternet was made .or carrying $3 tra..ic and cansigni.icantly reduce te overead relative to A6@! One study sows tat wen consideringtrimode packet size distriution, %ternet packet encapsulation overead was I!E percent,wile A6@ packet encapsulation overead was +C! percent!+

$n addition, since %ternet .rames contain a vastly iger ratio o. data to overead tan 3ON,

tat ig utilization can e reaced wile using low2cost optics! 6e more precise timingrequired wit 3ON results in more e/pensive optics!


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5. Manae!ent s"ste!s

%3ON requires a single management system, versus tree management systems .or te tree5ayer protocols in 3ON, wic means %3ON results in a signi.icantly lower total cost o.ownersip! %3ON also does not require multiprotocol conversions, and te result is a lower costo. silicon!

3ON does not support multicast services, wic makes support .or $3 video more andwidt2consuming!

#. Su$$ort for %&'( )*erla"

"ot protocols support a cale television (>A69) overlay, wic meets requirements .or a ig2speed downstream video service! %3ON wavelengts are +EB' nanometers downstream and+C+' nanometers upstream, leaving te +DD'2nanometer wavelengt .or a >A69 overlay similar to te wavelengts .or "3ON and 3ON!

+. Encr"$tion

:it 3ON, encryption is part o. te $67 standard!

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