oc6thsem,ftth

8/9/2019 oc6thsem,FTTH

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What isWhat is

FTTH?FTTH?

Copper

Fiber

24 kbps - 1.5 MbpsOld networks, optimized for voice

CO/HE

19 Mbps - 1 Gbps +Optical networks, optimized for voice,

video and data

CO/HE//

CO/HE//

//


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What is FTTH?What is FTTH? An OAN in whichthe ONU ison orwithin theAn OAN in whichthe ONU ison orwithin the

customers premise. Althoughthe firstinstalledcustomers premise. Althoughthe firstinstalled

capacityofaFTTH network varies,theupgradecapacityofaFTTH network varies,theupgrade

capacityofaFTTH networkexceedsall othercapacityofaFTTH networkexceedsall other

transmission media.transmission media. OAN:OAN: Optical Access NetworkOptical Access Network

ONU:ONU: Optical Network UnitOptical Network Unit

OLT:OLT: Optical LineTerminationOptical LineTermination

CO/HE//

ONUOLT

OAN


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FTTNFiber to the Node

< 25 Mb/s

FTTCFiber to the Curb

25 30 Mb/s

FTTBFiber to the Building

50 100 Mb/s

FTTHFiber to the Home

100 + Mb/s


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Why FTTH?Why FTTH? Enormousinformation carryingcapacityEnormousinformation carryingcapacity

EasilyupgradeableEasilyupgradeable

EaseofinstallationEaseofinstallation

Allows fullysymmetricservicesAllows fullysymmetricservices

ReducedoperationsandmaintenancecostsReducedoperationsandmaintenancecosts

Benefitsofoptical fiber:Benefitsofoptical fiber: Very longdistancesVery longdistances

Strong, flexible,andreliableStrong, flexible,andreliable

Allowssmall diameterand light weightcablesAllowssmall diameterand light weightcables

SecureSecure

Immunetoelectromagneticinterference (EMI)Immunetoelectromagneticinterference (EMI)


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0

10

20

30

40

50

60

70

80

90

100

kilometer

Twisted Pair Co-axial Multimode Single-mode

Why FTTH?Why FTTH? -- longer distances*longer distances*

*Typical distance for1 Gbpssystemcapability


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ArchitecturesArchitectures PON (APON (A--. E. E-- or Gor G--))

//

//

//

//

//

//

//

//

ONU

OLT

Optical splitter

1x16

1x32

Usually 10-20 km


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ArchitecturesArchitectures PON (2) (APON (2) (A--. E. E-- oror

GG--))

//

//

//

//

//

//

//

//

1550 nm broadcast

(if used)

1490* nm data

1310 nm data

* Datamaybetransmittedat 1550 nmifnot used forvideo

ONU

OLT


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ArchitecturesArchitectures Active NodeActive Node

//

//

//

//

//

//

//

ONU

Processing

(powered)

Up to 70 km Up to 10 km

OLT


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ArchitecturesArchitectures Active Node (2)Active Node (2)

//

//

//

//

//

//

//

1550 nm broadcast

(if used)

Data, 1310 or 1550 nm

on separate fibers

OLT

ONU


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ArchitecturesArchitectures Hybrid PONHybrid PON

//

//

//

//

//

//

//

ONU

OLT

Processing

(powered)

Up to 70 km

//

//

Up to 10 km

Optical splitter

Optical splitter


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ArchitecturesArchitectures Hybrid PON (2)Hybrid PON (2)

//

//

//

//

//

//

//

//

//

1550 nm broadcast

Data, 1310 or 1550 nm

on separate fibers

Single fiber, 1550 broadcast, 1310 bidirectional data

OLT

ONU


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Technical considerations - Speed

Service

Required DataRate

VoIP

Streamingaudio

Picturein15 seconds

SDTV

HDTV

FTTH

DSL orcable

modem


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Technology Minutes Hours Days

Modem 56

kb/s2

ISDN 128

kb/s20

DSL 1 Mb/s 2.5

Cable 2.5Mb/s

1

FTTH 0.4

Estimated minimum time to acquire BraveheartAugust 17, 2001:MGM, Paramount Pictures, SonyPictures, Warner Brothers, andUniversal Studios unveiled plansfor a joint venture that wouldallow computer users to

download rental copies of featurefilms over the Internet.

December 9, 2002:Hollywood's Latest Flop

Fortune MagazineThe files are huge. At 952

Megabytes,Braveheart took justless than five hours to downloadusing our DSL Line at home

Technical considerations Speed


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PON link budgetsPON link budgets

A system is limited in the distance you can

send signals and the maximum number oftimes you can split the signal to go to different

subscribers. The main problem is usually that

the signal level drops too low to be usable.


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PON link budgetsPON link budgets

//

Fiber loss per km is 0.25 dB (1550 nm) to

0.4 dB (1260 - 1360 nm)

//

Every time the signal is

split two ways, half the

power goes one way and

half goes the other. So

each direction gets half

the power, or the signal

is reduced by

10log(0.5)=3 dB.

Practical loss is 3.5 dB

nominal, so every two-way split costs about 10

km distance @ 1310 nm


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FTTHFTTHStandards?Standards? Customers wanttousestandardizedsystemsCustomers wanttousestandardizedsystems

formaximumchoicein equipment, lowestformaximumchoicein equipment, lowest

cost,and widespreadavailabilitycost,and widespreadavailability

Therearetwoknown groups workingonTherearetwoknown groups workingon

standardsstandards FSANFSAN Full Service Access NetworkFull Service Access Network

Reportssubmittedto ITU asthestandardsbodyReportssubmittedto ITU asthestandardsbody

Formedby 7 telecomcompaniesin 1995Formedby 7 telecomcompaniesin 1995

Now manymoremembersNow manymoremembers

G.98xseriesofstandards,mostbasedon ATMbut nowG.98xseriesofstandards,mostbasedon ATMbut now

addingothersaddingothers

IEEE 802 EFMIEEE 802 EFM Ethernetin theFirstMileEthernetin theFirstMile Firststandardsdueout 2004Firststandardsdueout 2004

FiberandcopperEthernettothehomeandbusinessFiberandcopperEthernettothehomeandbusiness


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ITUITU--T G.98x seriesT G.98x series

Only published international standard forOnly published international standard for

FTTHFTTH

Describes a Passive Optical NetworkDescribes a Passive Optical Network

carrying ATM traffic and TDMA subscribercarrying ATM traffic and TDMA subscriber

accessaccess

Several versions published since OctoberSeveral versions published since October

19981998

G.983.1G.983.1 -- Basic ATMBasic ATM--PON systemPON system

G.983.2G.983.2 -- ONT management and control interfaceONT management and control interface

G.983.3G.983.3 -- WDM system for enhanced services (i.e.WDM system for enhanced services (i.e.

analog video)analog video)

G.984.1 andG.984.1 and --.2.2 GPON (hybrid ATM and Ethernet)GPON (hybrid ATM and Ethernet)

G.985G.985 100 Mb/s point100 Mb/s point--toto--point, Ethernetpoint, Ethernet


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IEEE 802.3ahIEEE 802.3ah -- Ethernet in the FirstEthernet in the First

Mile (EFM)Mile (EFM) Organizedinformally viathe IEEE 802.3inOrganizedinformally viathe IEEE 802.3in

Fall 2000Fall 2000

Charteredas IEEE 802.3ahin Spring 2001Charteredas IEEE 802.3ahin Spring 2001

Develop 1 Gb/sEthernetaccessstandardsDevelop 1 Gb/sEthernetaccessstandards

includingFTTHincludingFTTH

PointPoint--toto--Point (homerun)Point (homerun)

PointPoint--toto--Multipoint (PON)Multipoint (PON)

Twisted pairstandardstooTwisted pairstandardstoo

Publication 2004Publication 2004


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IEEE 802.3ah EFM statusIEEE 802.3ah EFM status PON Physical Medium Dependent (PMD)PON Physical Medium Dependent (PMD)

basedon ITUbasedon ITU--T 983seriesT 983series

Homerun PMD basedon fastandgigabitHomerun PMD basedon fastandgigabitEthernetstandardsEthernetstandards

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