Ethernet Passive Optical Network Epon Building a Next884

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Ethernet Passive Optical

Network(EPON) : Building a Next-Generation Optical Access

NetworkO!"#E $ EG %&'nstructor $ r* Bin +ang

Presenter $ "a, er

Authors : Glen Kramer and Gerry Pesavento(AllOptic Inc.).


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Overview

Introduction What are Passive Optical Networks ? Deployment Scenario of Next-eneration !ccess

Networks "ypes of PON technolo#ies Di$erent types of PON topolo#ies What are %PONs ? &ow does an %PON work ? Issues related to %PONs

'ene(ts of usin# %PONs I%%% P)*+,+ah status "he market for %PONs onclusion


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ntroduction

nternet has spawned genuine de,and .or /road/and services0 leading tounprecedented growth in nternet Protocol

(P) data tra1c* 2his hu,ongous datatra1c is putting pressure on carriers toupgrade their networks*

An i,prove,ent over 34 k/5s is una/le to

provide enough /andwidth .or e,ergingservices such as the P telephon0 6ideoon e,and (6o)0 interactive ga,ing0 ortwo-wa video con.erencing*


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-new services kept increasing as

shown

A new technology is

require which

woul !e "!le toh"nle the

!"nwith hungry

ser#ices$


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+hat is a Passive Optical

Network (PON) 8 Passive Optical Network (PON) is a high

/andwidth Point-to-9ultipoint (P9P) optical;/er network /ased on the Asnchronous

2rans.er 9ode protocol (A29)0 Ethernet or 29* omponents used in Passive Optical

Network PONs generall consist o. an O


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Properties o. PONs PONs rel on light waves .or data trans.er* Onl passive optical co,ponents are used

such as optical ;/er , splices and splitters* PONs ,ini,i=es the ;/er deplo,ent in /oth

the local exchange o1ce and the local loop* PONs provides higher /andwidth due to

deeper ;/er penetration0 o>ering giga/it per

second solutions*


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"ange o. operation o.

PONs

&'(s "i) to !re"* the +irst ,ile once c"lle "s ."st ,ile

!"nwith !ottlenec* !y t"rgeting the sweet sot !etween 1s

"n 'C-3s th"t other "ccess networ* technologies o not"equ"tely "ress$ &'(s "re c""!le o eli#ering high

#olu)es o ustre") "n ownstre") !"nwith u to %22

,!s ownstre") "n 155 ,!s ustre")$


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eplo,ent scenario o. Next-

Generation Access Network A logical wa to deplo optical ;/er in the local

access network is using a point-to-point (PP)

topolog0 with dedicated ;/er which runs .ro,the local access network to each end-usersu/scri/er (?igure a)


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eplo,ent o. Next-Generation

Access Network contd** #econd ,ethod is to deplo a re,ote switch

(concentrator) close to neigh/orhood since it reducesthe ;/er deplo,ent as shown in (?igure /)* 2he ,aindownside o. this cur/ switch architecture is it re7uires

electrical power as well as the /ackup power at the cur/unit and currentl0 one o. the highest cost .or localexchange carriers is providing and ,aintaining electricalpower in the local loop*


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eplo,ent o. Next-Generation

Access Network contd** n the third we can see that a PON actuall ,ini,i=es the

a,ount o. optical transceivers0 central o1ce ter,inations0and the ;/er deplo,ent* As stated earlier a PON is a point-to-,ultipoint (P9P) optical network with no active

ele,ents in the signals path .ro, the source to destination*PONs /asicall use passive optical co,ponents0 such asoptical ;/er0 splices0 and splitters* 2his is show in the ?igurec.


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ecrease in the nu,/er o.?i/ers and 2ransceivers used

Point to point network - (u)!er o +i!er - 32

(u)!er o r"nscei#ers - %4

Cur!switched network - (u)!er o +i!ers - 1

(u)!er o r"nscei#ers - %%

Passive Optical "etwork - (u)!er o +i!er - 1

(u)!er o r"nscei#ers - 33


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2pes o. PON

technologies&'(

Asynchronous tr"nser )oe

&'(s A&'(s

Ethernet &'(s E&'(s


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Passive Optical Networks !PONs ata is trans,itted in ;xed

length 53-byte cells asspeci;ed / A29 protocol*

APONs don@t deliver data0video and voice over asingle plat.or,*

APONs o>er insu1cient/andwidth

APONs are expensive APONs do not provide

/roader service capa/ilities

%PONs ata is trans,itted in varia/le-

length packets o. up to 1,518

bytes according to EEE '*protocol .or Ethernet* EPONs deliver data0 video and

voice over a single plat.or, EPONs o>er higher /andwidth

EPON# are less expensive thanAPONs EPONs provide /roader service

capa/ilities


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o,ponents used in PON

topologiesAll tr"ns)ission in " &'( "re eror)e !etween "n

otic"l line ter)in"l '. "n otic"l networ* units

'(s$

What is Optical Line Terminal (OLT) ?

An '. resies in the loc"l ech"nge centr"l oice6

connecting the otic"l "ccess networ* to the )etro !"c*-!one$

What are Optical Network Units (ONUs) ?

he '( ro#ies the inter"ce !etween the custo)ers "t"6 #ieo6"n telehony networ*s "n the &'($ Its unction is to recei#e tr"ic

in " otic"l or)"t "n con#ert it into custo)ers esire or)"t

Ethernet6 I& )ultic"st6 16 etc$


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2pical PON architecture

#PO"s

APO"s


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i>erent tpes o. PON

topologies 2ree topolog

Bus topolog

"ing topolog

2ree with redundant trunk


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PON topologies

+igure 3


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+h do we re7uireEPONs8

+e re7uire EPON technolog since it hasthe .ollowing 7ualities:

it is inexpensive0 si,ple0 scala/le and

capa/le o. delivering /undled voice0

it provides data and video services to anend-user su/scri/er over a singlenetwork*


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+hat are EPONs8

Ethernet passive optical networks (EPON) arean e,erging access network technolog thatprovides a low-cost ,ethod o. deploingoptical access lines /etween a carrier o1ce(O) and custo,er site*

+e can sa that0 Ethernet Passive Optical

Networks (EPONs) represents the convergenceo. low-cost Ethernet e7uip,ent and low-cost;/er in.rastructure0 to /e the /est candidate.or the Next-Generation access network*


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Cow does an EPON work 8

n a EPON the process o. trans,ittingdata downstrea, .ro, the Oerent .ro, trans,itting dataupstrea, ,ultiple ON!s to the Oerent techni7ues used to

acco,plish the downstrea, andupstrea, trans,ission in a EPON areshown in ?igure D and ?igure 3*


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ownstrea, tra1c inEPON


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ownstrea, 2ra1c ow in anEPON

onsider the downstrea, tra1c in EPON

n the ?igure D0 the data /roadcasted downstrea, .ro,

O


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ownstrea, ?ra,e ?or,atin an EPON


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!pstrea, tra1c in EPON


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!pstrea, 2ra1c ow in aEPON

?igure 3 shows the upstrea, tra1c is ,anaged utili=ing 29 technolog0 in which trans,ission ti,e slots arededicated to ON!s* 2he ti,e slots are snchroni=ed sothat upstrea, packets .ro, the ON!s do not inter.erewith each other one the data is couple onto the co,,on;/er* ?or exa,ple0 ON!-F trans,its packet F in the ;rstti,e slot0 ON!- trans,its packet in the second non-

overlapping ti,e slot0 and ON!- trans,its packet ina third non-overlapping ti,e slot*

onsider the downstrea, tra1c in EPON


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!pstrea, ?ra,e ?or,at in anEPON


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2ransceiver ssues

2here are nu,/er o. issues which havesur.aced / the use o. transceivers (A

transceiver is a device which is capa/leo. trans,itting and receiving signals)

ue to the une7ual distances /etweenthe central o1ce and ON!s0 optical signal

attenuation in the PON is not sa,e .oreach ON! i*e* the power level received atthe Oerent .or each ON!(this is also called as near-.ar pro/le,)


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2ransceiver ssues ontd*

As shown in the ?igure /elow0 one ON!s signal strength is lowerat the O


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solve the attenuation

pro/le,

2here are couple o. approaches which are suggested in thispaper /ut the have not /een i,ple,ented since the havetheir own draw/acks

One o. the approaches suggested is:

2o allow ON!s to adHust their trans,itter power such thatpower levels received / the O


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#ecurit

Encrption ,echanis, is necessar

since a ,alicious ON! i. placed inpro,iscuous ,ode would /e a/le toread all the downstrea, packets*

Is Encrytion )ech"nis) necess"ry in

&"ssi#e 'tic"l (etwor* 8

n w c aer o e


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n w c aer o e,odel the encrption ,ust

/e placed8

. the encrption is placed in the 9A laer then it willencrpt the 9A .ra,e paload onl0 and leave theheaders in plain text* 2his ,ethod prevents ,aliciousON!s .ro, reading the paload0 /ut the ,a still

learn other ON!s 9A address* ,ple,enting the encrption sche,e on the phsical

laer would encode the entire /it strea,0 including the.ra,e headers and "* n this sche,e no in.or,ationis learned / a ,alicious ON!* But the di1cult is thephsical laer is a connectionless laer* "e7uiring thePhsical laer in a Oerent kes .ordi>erent ON!s will ,ake it connection-aware*

#o encrption in EPON still re,ains an open 7uestion*


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Bene;ts o. Ethernet PONs

Cigher /andwidth: up to F*3 G/ps s,,etricEthernet /andwidth

erings ,eans higher revenues


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Cigher /andwidth

9ore su/scri/ers per PON

9ore /andwidth per su/scri/er

Cigher split counts 6ideo capa/ilities

Better Io#


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9ore "evenue

EPONs support .or legac 290 A29 and #ONE2

services* eliver o. new Giga/it Ethernet0 .ast Ethernet0

P ,ulticast and dedicated wavelength services* Provisioning o. /andwidth in scala/le 4D J/ps

incre,ents up to F G/ps*

2ailoring o. services to custo,er needs withguaranteed #


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EEE P'*ah status

2he standards work .or Ethernet in the localsu/scri/er access network is /eing done in theEEE P'*ah Ethernet in the ?irst 9ile (E?9) 2ask

?orce*n order to evolve Ethernet .or local su/scri/ernetworks0 P'*ah is .ocused on .our pri,arstandards de;nitions:

Ethernet over copper

Ethernet over PP ;/er Ethernet over P9P ;/er Operation0 ad,inistration0 and ,aintenance (OA9)


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IEEE 02$3"h h"s !een "ro#e$ ,"teri"ls concerning the

&02$3"h st"n"rs eort "n the resent"tion )"teri"lsc"n !e oun "t:

;http:$$www.ieee%&'.or$$e*m$inde+.html

;http:$$www.ieee%&'.or$$e*m$pulic$inde+.html

http://www.ieee802.org/3/efm/index.htmlhttp://www.ieee802.org/3/efm/public/index.htmlhttp://www.ieee802.org/3/efm/public/index.htmlhttp://www.ieee802.org/3/efm/index.html


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2he 9arket .or EPONs

Analsts expect the optical access,arket to grow rapidl*

B (anadian ,perial Bank o.o,,erce) .orecasts the ,arket .orPON access sste, to reach KF /illion/ ''D .ro, K ,illion in '''*

PP optical Ethernet o>er the /estpossi/ilit o. a turnaround in theteleco, sector*


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onclusion

2he .uture o. /road/and access networkis likel to /e a co,/ination o. point-to-point and point-to-,ultipoint Ethernet0opti,i=ed .or transporting P data0 aswell as ti,e critical voice and video*


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"e.erences

2opics in

Ethernet Passive Optical Network Epon Building a Next884

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