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Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
Broadband Access Over HFC Networks
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Broadband Access Over HFC Networks

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Invited speech on Optical Fiber Communication Conference, 1999

Invited speech on Optical Fiber Communication Conference, 1999

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  • 1. Broadband Access over HFC Network Xiaolin Lu OFC 1999 AT&T LabsXL 2/10/99
  • 2. What is this?  Aninvited speech on Optical Fiber Communication Conference (1999) about technology evolution of HFC NetworksXL 2/10/99
  • 3. TollXL 2/10/99
  • 4. INTERDEPENDENCY VOICE VIDEO  Communication  Entertainment Services  Point-to-point  Broadcast  “On-Demand”  Always there Billing  Usage-based  Flat rate  Narrowband/  RF Broadband Transport baseband  Point-to-point  Point-to-multipoint Network  Coax  Twist pairXL 2/10/99
  • 5. OUTLINE  EVOLUTIN OF CABLE INDUSTRY  MOVING FORWARDXL 2/10/99
  • 6. WHEN IT STARTED … HE  Broadcast Tree-and-Branch  Consistent with street layout  Security  Flexible user connection  Reliability  Broadband (1GHz)  QualityXL 2/10/99
  • 7. EVOLVING Transport - Lightwave - RF Network  Upgrade - Distribution - Quality - Trunk  Broadband SDV  AM-VSB - Reliability - Bandwidth Terminal - Upstream - Modem - Protocol Operation - Monitoring - ManagementXL 2/10/99
  • 8. EVOLUTION AND REVOLUTION Need Architecture More Evolution/ Revolution Digital Cable Services Modem Quality Reliability HFC Linear Lightwave RF & DSP Low-cost lightwave Technology and WDMXL 2/10/99
  • 9. Coax to HFC HEXL 2/10/99
  • 10. Coax to HFC FN FN HE FN  Increase transport capability  Improve quality and reliability  Challenge for linear lightwaveXL 2/10/99
  • 11. CHALLENGES OF AM-VSB TRANSMISSION AM- XTR RCV Requirements: CNR 52dB 47dB CTB/CSO -65dBc -55dBc Saleh Limit Challenges: CIR - Linearity - Dispersion - Linearity - Noise - Reflection - Noise - Chirp - Others OMDXL 2/10/99
  • 12. TREND IN LINEAR LIGHTWAVE/RF NEED TECHNOLOGY PRODUCT APPLICATION Moderate  Node Digital 2-way 2- DFB & FP  Hub High- High-end DFB  Capacity+  Analog  Digital External  HE  Trunk  Lower cost Modulator  Hub  Broadcast  Two-way upgrade  EDFA  WDM GaAs RF Coax Coax Plant Amplifier Amplifier UpgradeXL 2/10/99
  • 13. Performance of An Uncooled FP Laser  No TE cooler, no isolator  60 QPSK channels at 2Mbps/ch  ~ $100  Temperature: 200C ~ 800C -2 Theory Room Temperature -3 T>80C Reflection log(BER) -4 -5 -6 -7 -8 -9 -10 2 4 6 8 2 4 6 8 2 0.1 1 10XL 2/10/99 OMD(%) S. Woodward, G. Bodeep, OFC’95
  • 14. RF MODEM TECHNOLOGY I I 10110 10110 DMUX Carrier Carrier MUX S S Recovery 900 900 Q Q Modulation Spectral Efficiency CNR Technique Theory Practical (10-8) QPSK 2 1.2 - 2 15 16-QAM 4 2.5 – 3.5 22.5 64-QAM 6 4.5 – 5 28.5 AM-VSB 47XL 2/10/99
  • 15. New Transport Opportunities DSP Multimedia  MPEG-2, MPEG- etc Digitization RF Modem Digital SCM System  BW efficiency  Robustness  Broadcast/narrowcast digital TV Digital RF Transmission S  Interactive video RF/(wireless)  2-way communication  Front-end Front-  Voice, data, etc  Wireless backhauling Linear Lightwave Low- Low-cost  Maturity LightwaveXL 2/10/99
  • 16. EVOLUTION AND REVOLUTION Need Architecture More Evolution/ Revolution Digital Cable Services Modem Quality Reliability HFC Linear Lightwave RF & DSP Low-cost lightwave Technology and WDMXL 2/10/99
  • 17. CHALLENGES HE FN HE FN HE FN Analog Emerging TV Services 5 50 500 750 1G  Bandwidth Capacity: 5-40MHz/1000s HHP upstream  Transport Integrity: Ingress noise, dynamic range  103-to-1 Architecture: to- Centrally- Centrally-mediated MACXL 2/10/99
  • 18. SOLUTIONS Bandwidth UPGRADE Capacity  Fiber Node Network Segmentation  DWDM Trunk Transport Integrity DOCSIS  High level modulation Modem  Centrally- 103-to-1 mediated MAC ArchitectureXL 2/10/99
  • 19. Fiber Node Segmentation HE FN 1,200 Homes  Long cascade coax bus shared by many users (1000s)XL 2/10/99
  • 20. Fiber Node Segmentation 300 Homes 300 Homes HE FN 300 Homes 300 Homes  1,200 HHP/FN with 300 HHP/BusXL 2/10/99
  • 21. Fiber Node Segmentation RCV H XTR LXL 2/10/99
  • 22. Fiber Node Segmentation H H L L RCV XTR H H L L  Frequency Stacking or DWDM for 4X capacity  Closer tracking of ingress noiseXL 2/10/99
  • 23. DISTRIBUTED HEAD-END HEAD- HE FN Primary Primary Hub HE Ring FN HE  Operation complexity  Cost of CMTS at lower take rateXL 2/10/99
  • 24. DWDM TRUNK SH FN Primary Primary Hub SH Ring FN SH  DWDM transport for end-to-end transparency end-to-  Route diversity for service protection  Consolidate high-end terminals (CMTS) high-XL 2/10/99
  • 25. DWDM TRUNK Primary Hub Secondary Hub 1.3mm XTR Coarse WDM l 1 x 8 DWDM 1 x 8 DWDM l l . . . . . . Fiber Node 1.5mm RCV RCV l 1 x 8 DWDM 1 x 8 DWDM RCV l RCV . . . . . .XL 2/10/99
  • 26. MODERN HFC NETWORK SH FN Primary Primary Hub SH Ring SH FN DWDM Transport Segmentation End-to-end Transparency 4X capacityXL 2/10/99
  • 27. What If We Succeed?  Bandwidth exhaustion  Transport integrity  Take rate and multiple lines  New services  User behavior  Performance 10000 1000 Delay (ms) 100 Life cycle cost 10 v.s. 1 10 20 30 40 50 60 70 80 90 100 Front- Front-end costXL 2/10/99 Users
  • 28. ARCHITECTURES Tree-and-Branch  Broadcast FN  Cascaded ??? Cell-Based  Narrowcast RN  ClusteredXL 2/10/99
  • 29. Mini Fiber Node (mFN) mFN FN mFN Primary Primary Ring Hub mFN FN mFN DWDM Analog Digital TV TV 5 50 500 750 1G  mFN overlay for a cell-based digital platform cell-  Multi- Multi-purpose infrastructure  50- 50-100 times more clean two-way bandwidth two-  Distributed MAC protocol with better performanceXL 2/10/99
  • 30. Early Version of an mFN PrototypeXL 2/10/99
  • 31. Line extender mFNXL 2/10/99
  • 32. DELAY COMPARISON 1000 100 Average delay (ms) 10 mFN-NAD CM 1 0.1 mFN-NAD Cable modem 0.01 10 20 30 40 50 60 70 80 90 100 Number of active usersXL 2/10/99
  • 33. Mini Fiber Node (mFN) mFN FN mFN Primary Primary Ring Hub mFN FN mFN DWDM PCS Analog Digital TV TV 5 50 500 750 1G 2G  Multi- Multi-service platformXL 2/10/99
  • 34. MOVING FORWARD Software  Data/IP Program  Competition Coax Network HFC Upgrade Evolution  Integrity  More services for two-way & HE HE FN broadband Revolution  Lightwave Linear and RF Lightwave  RF Modem Hardware  DSPXL 2/10/99
  • 35. EVOLUTION Demand Bandwidth per Customer Take Rate Applications User Behavior Push Fiber Deeper Split Nodes Higher RF Efficiency TimeXL 2/10/99
  • 36. Fiber Optics for Cable 108 FTTH 107 FTTC (102 HP/node) 106 Fiber termination 105 FSA (103 HP/node) 100 ch AM 104 103 102 40 ch AM 86 92 00 06 Broadcast Two-way BroadbandXL 2/10/99
  • 37. White Space $$ Harmonic Lightwaves Phillips GI Scientific Atlanta ANTEC Ortel Lucent C-COR ??? VolumeXL 2/10/99
  • 38. “There is no wrong technology, there are only wrong assumptions.”XL 2/10/99

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