PON design considerations for FTTH FTTx

EPON N t kEPON Network Design ConsiderationsDesign Considerations

By SUN Telecomhttp://www.suntelecom-cn.com/

SSummarizationummarization www.suntelecom-cn.com

1. Bandwidth Requirements2. Splitting Architecture3 Distance3. Distance4. Optical power budget to make sure the optical loss in

proper rangeproper range5. Services to provide6. Update the existing network7. Network Nodes8. Cables

1.1.BBandwidth Requirementsandwidth Requirements1. The number of subscribers.2. Bandwidth for each subscriber. 3. Bandwidth Calculation:4. Actual Average Bandwidth = Bandwidth for each User x

Network Concurrent Rate x Online Rate or Actual Total Bandwidth = Bandwidth for each Subscriber x The Number of Subscribers x Network Concurrent Rate xNumber of Subscribers x Network Concurrent Rate x Online Rate

5. According to the effective bandwidth of each PON gport(about 900M) calculate the number of PON cards.

6. Distribute different bandwidth for different users according to the situation.

7. Reserve bandwidth for update if needed.

2.2.SSplitting Architectureplitting Architecture

1 The splitting architecture is depend on the distribution of1. The splitting architecture is depend on the distribution of the users, and the need of service providing.

2. Decide 1-stage splitting or 2-stage splitting.3. Consider average splitting or not. Generally in EPON

system PLC splitter will be used for equal optical power di ision and FBT splitter for neq al optical po er di isiondivision and FBT splitter for unequal optical power division.The comparison as follows:

SSplitting Architectureplitting Architecture

Parameters PLC Splitter FBT Splitter

Wavelength Range (nm) 1260 ~ 1650nm Single/dual/triple window

S litti R ti E l di i i Equal or non-equalSplitting Ratio Equal division Equal or non equal division

Dimensions Small Large size for multi channelchannel

Wavelength Sensitivity Low High

Low splitting channel Price is lower for smallCost Low splitting channel, high price

Price is lower for small channel splitter

SSplitting Architectureplitting Architecture www.suntelecom-cn.com

4. For PLC splitter we have following splitting architectures: p g p g1. Distribution Splitting2. Aggregation Splitting3. Centralized Splitting

Cascading Splitting (1 x 8 / 1x 4 or 1x 4 / 1x 8)Cascading Splitting (1 x 8 / 1x 4 or 1x 4 / 1x 8)

PlacementPlacementPOS Located in LCP and NAP

F tFeaturesMulti-point testing and maintenanceHi h ti l lHigh optical lossLow OLT PON port utilization rateComplicated net ork str ct re hard to maintainComplicated network structure, hard to maintain

Application A i l th dAerial access method Network reform

Single Splitting (1 : 32)Single Splitting (1 : 32)

PlacementPlacementLCP

FeaturesFeaturesIntegrated link testing and user managementLow Optical losspHigh OLT PON port utilization rateLow cost for splitterSimple network topology, easy to maintain

ApplicationDuct access methodNew Project

PlacementCOCO

FeaturesSingle point link testing and maintainSingle point link testing and maintainLow Optical lossHigh OLT PON port utilization rateLow cost for splitterDedicated cable for each houseFlexible topologyFlexible topologyHuge infrastructure cost

ApplicationppDuct access, new project, user close to CO

1 EPON can support a transmitting distance for about 201. EPON can support a transmitting distance for about 20 km under 1:32 splitting ratio, and about 10 km under 1:64 splitting ratio.

2. The distance mainly depends on the optical loss. The higher the optical loss is, the shorter the transmitting distance will bedistance will be.

3. If the transmitting distance of cable is more than 2 km, fiber splicing should be taken into account.

4. For nodes in different distances we may use FBT splitter to distribute more optical power for the further node and less optical power for the nearer node thusnode and less optical power for the nearer node thus make sure all the nodes can get enough optical power.

5.5.OOptical power budget ptical power budget

1. EPON System1. EPON System2. CATV System

LLight Budget Calculationight Budget CalculationItems Unit Single Fiber (PX20)

OLTOLTMean Output Power MIN dBm 2Mean Output Power MAX dBm 7Mi S iti it dB 29Min Sensitivity dBm -29Min Overload dBm -10

ONUMean Output Power MIN dBm -1Mean Output Power MAX dBm 4Min Sensitivity dBm 25Min Sensitivity dBm -25Min Overload dBm -3

Optical PowerMax. Optical Power Consume dB 27Min Optical Power Consume dB 14

PPower Loss Point Analysisower Loss Point AnalysisName Avg. Loss (dB)

Adapter 0 2

Connection

Adapter 0.2

Quick Connection Connector 0.4

Fusion Splicing 0 1Fusion Splicing 0.1

1:32 16.5

1:16 13 5

Splitter

1:16 13.5

1:8 10.5

1:4 7 21:4 7.2

1:2 3.2

1310nm 0 36 /kmCable (G. 652)

1310nm 0.36 /km

1490nm 0.25 /km

OODNDN Light Budgeting (Example)Light Budgeting (Example)

Length of Fiber CableLength of Fiber CableWavelength of the LightQ fQuantity of AdapterNumber of Quick Connection ConnectorSplitter

220km Optical Loss (1 Splitter)0km Optical Loss (1 Splitter)

Loss Type QtyAvg. Loss (dB)

Total Avg. Loss (dB)

1:64 1:32 1:16 1:8 1:4 1:2(dB)Cable (G.652) (km) 20 0.36 7.2 7.2 7.2 7.2 7.2 7.2Adapter (pc) 7 0.2 1.4 1.4 1.4 1.4 1.4 1.4Quick Connection Connector (pc) 1 0.4 0.4 0.4 0.4 0.4 0.4 0.4

Extra Loss 1 1 1 1 1 1 1 1Extra Loss 1 1 1 1 1 1 1 1

Passive

1;64 1 19.7 19.71:32 1 16.5 16.5Passive

Optical Splitter (pc)

1:16 1 13.5 13.51:8 1 10.5 10.5

(pc) 1:4 1 7.2 7.21:2 1 3.2 3.2

Total Loss (dB) 29 7 26 5 23 5 20 5 17 2 13 2Total Loss (dB) 29.7 26.5 23.5 20.5 17.2 13.2

1100km Optical Loss (km Optical Loss (2 2 Splitters)Splitters)

Loss Type QtyAvg. Loss (dB)

Total Avg. Loss (dB)

1:64 1:32 1:16 1:8 1:4 1:2(dB)Cable (G.652) (km) 10 0.36 3.6 3.6 3.6 3.6 3.6 3.6Adapter (pc) 8* 0.2 1.6 1.6 1.6 1.6 1.6 1.6Quick Connection Connector (pc) 1 0.4 0.4 0.4 0.4 0.4 0.4 0.4

Extra Loss 1 1 1 1 1 1 1 1Extra Loss 1 1 1 1 1 1 1 1

Passive

1;64 1 19.71:32 1 16.5 16.5Passive

Optical Splitter (pc)

1:16 1 13.5 13.51:8 1 10.5 10.5

(pc) 1:4 1 7.2 7.21:2 1 3.2 3.2 3.2 3.2 3.2 6.4* 3.2

Total Loss (dB) 26 3 23 3 20 3 16 9 12 9 9 7Total Loss (dB) 26.3 23.3 20.3 16.9 12.9 9.7

11:64, 1:32 Optical Budgeting:64, 1:32 Optical Budgeting

20km 15km 10km 5km

1:64 1:32 1:64 1:32 1:64 1:32 1:64 1:32

1:64 29.5 27.75 26 24.25

1:32 26.3 24.55 22.8 21.05

Preserve 3 3 3 3 3 3 3 3

Total Loss 32.5 29.3 30.75 27.55 29 25.8 27.25 24.05

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1550nm1550nmTransmitter: 17.5dBm

( )Receiver: -6 ~ 2dBm (-10 ~ 2dBm)17.5dBm – 23.3dBm = - 5.8dBm

5.5.SServices to provideervices to provide

1. EPON provides services such as data, IPTV/CATV and VoIP, widely used in various applications like FTTH, FTTB, FTTC, triple pla sec rit s stem ideo s r eillance s stemtriple play, security system, video surveillance system, intelligent community, city hotspot (airport, station, etc.), Wi-Fi access and even TDM over EPONFi access, and even TDM over EPON.

2. FTTH topology.3. FTTB/C topology.4. FTTO topology.5. EPON surveillance topology.

FFTTH topologyTTH topology www.suntelecom-cn.com

FTTB/C Topology www.suntelecom-cn.com

FTTO Topology www.suntelecom-cn.com

EEPON surveillance topologyPON surveillance topology

1. Update the existing network by adding cables and devices to provide new services.

2. CATV coaxial network can be upgraded to HFC network to provide triple play service by adding EOC devicesprovide triple play service by adding EOC devices.

3. Pure data EPON network can be upgraded to provide CATV service by adding WDM devices.service by adding WDM devices.

4. CATV fiber optical network can be upgraded to provide triple play service.

5. Former fiber optical network can also be upgraded to provide services for a wider area and more users.


1 Deployment and design requirement1.Deployment and design requirement

①OLT central office should be easy to handling large①OLT central office should be easy to handling large equipment②Enough space for device installation and storage③Good working environment (Temperature & Humidity)④Central Office construction standard⑤CO ith fi f t i t⑤CO with fire safety equipment⑥The CO should be far away from high-intensity vibration source, noise source, electromagnetic interference, andsource, noise source, electromagnetic interference, and flammable and explosive materials


2 Power supply requirement2.Power supply requirement

①Provide 48V power supply①Provide -48V power supply②Highest power load requirement that the area can have③Individual power line access dedicated power③Individual power line access, dedicated power distribution box④UPS power supply④UPS power supply


3 Grounding requirement3.Grounding requirement

①AC/DC Power supply grounding①AC/DC Power supply grounding②Section size of grounding wire should greater than 25mm225mm2③Ground resistance should be less than 5 ohm

User aggregation pointUser aggregation pointLocated in place that is easy to manage and

i t imaintainBuilding distributor, weak current vertical shaft,

d i l i bioutdoor optical cross-connection cabinet, man hole, pole etcActive connection, easy to inspect and maintain


Close to subscriberClose to subscriberThe terminal device can not too big

fFloor vertical shaft, staircase, electrical poleDistribution cable spliced with drop cable


For FTTH application dedicated box for installFor FTTH application, dedicated box for install ONU, embedded on the wallL l lLocal power supply


Feeder Fiber CableFeeder Cable for connection Cable from ODF in central office and splitter distribution cabinet in LCP.Direct burial duct or aerial installationDirect burial, duct, or aerial installation.

Distribution Fiber CableFor connection Splitter distribution point to fiber distribution pointFor connection Splitter distribution point to fiber distribution point, Indoor or outdoor application.

Drop CableThe last-mile of the ODN, from fiber distribution point to user terminal. Direct burial duct or aerial installationDirect burial, duct, or aerial installation.


TThanks!hanks!TThanks!hanks!

By SUN Telecomhttp://www.suntelecom-cn.com/

PON design considerations for FTTH FTTx

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