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From the device to the outside plant installation practice Daniel Lecrosnier

The role of technology. From the device to the outside plant installation practice Daniel Lecrosnier France Telecom /CNET CH : L. Budry, C. Zimmer DT : B. Jacobs FT : F. Bourgart, D. Jugan, C. Kazmierski, A. Madani, S. Mottet HT : G. Gerdai, P. Jeszenoi, K. Szomolanyi

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From the device to the outside plant installation practice Daniel Lecrosnier

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  1. The role of technology From the device to the outside plant installation practice Daniel Lecrosnier France Telecom /CNET CH : L. Budry, C. Zimmer DT : B. Jacobs FT : F. Bourgart, D. Jugan, C. Kazmierski, A. Madani, S. Mottet HT : G. Gerdai, P. Jeszenoi, K. Szomolanyi PT : M. Pousa, Ana Cristina TE : D. Collins TI : P. Bradley, N. Caponio, G. Ciochetto, G. Destefanis, A. Gnazzo Sonera Ltd : A. Immonen daniel. lecrosnier@cnet.francetelecom.fr

  2. Presentation outline • P614 Task 4 : broadband access enabling technologies • FTTx infrastructures : requirements & challenges • xDSL: hardware analysis • Power Lines communications • Conclusions

  3. Task4 : addressing basic technologies State of the art and evolutions Cost figures & standardisation issues FTTx:Optoelectronic modules Optical cabling technologies Point to point / point to multipoint links Measurements and maintenance of the hardware Opportunities for WDM technologies in access Powering Civil work Installation techniques Copper: xDSL techniques Power lines communications ANCIT workshop Torino March 98

  4. F T T B O N U L E X O N U F T T C / C a b F T T H O M M D F O O N U O N U L F T T F / O T O N U O N U D u c t D u c t / d i r e c t b u r i e d M a n h o l e C o n n e c t o r s : C a b l e s : S p l i t t e r : S p l i c e s i n e n c l o s u r e : M D F : m a i n d i s t r i b u t i o n f r a m e O M : o p t i c a l m o n i t o r i n g FTTx infrastructure : hardware & civil work (HFR) (HFC)

  5. Optical access network : specific requirements 1. Reduce the costs:O/E conversion hardware, installation, civil works 2. Overcome many environmental constraints: . aerial cables (humidity, temperature variations, UV, wind, frost, snow, shots) : special fibre/cable design, robust connecting technologies . cable installation using copper civil work (overlay deployment) : low diameter, high density fibre cables . many branching points :easy splicing, fast connector mounting . indoor cabling :low curvature radius fibre/cable . customer installation :hardware must be secure, robust and friendly to handle

  6. ATM/PON standard from FSAN Optical Transmission 2 fibres 1fibre 1fibre WDM WDM 1.3µm 1.3 1.5 1.3+ 1.3- Bit rate (Mbit/s) between Downstream Upstream OLT and ONU Symmetric 155 155.52 155.52 Asymmetric 622 622.08 155.52 Optical path loss 10 - 25 dB (G.982 Class B) 15 - 30 dB (G.982 Class C) Differential path loss 15 dB Overall reflectance at S/R points 32 dB Temperature FTTH ONU 0 to 60°C (case temperature) - 40 to +85°C (storage)

  7. O/E module road map InP Evolution of Technologies Integrated optical module WDM mux/dmux Laser with spot size converter l l , 1 2 l 1 Fibre l Waveguide Photodiode 2 PLC Si platform Hybrid optical module (Planar Lightwave Circuit) Years Micro-optics 1990 2000

  8. Basic cost of O/E modules 5 0 0 Data rate 155 Mbit/s 1996 FSAN data M i c r o - o p t i c s t r e n d P L C H y b r i d I n t e g r a t i o n 4 0 0 ) $ 3 0 0 S U ( E C 2 0 0 I R P 1 0 0 1998 micro-optic 40 dollars 1 0 1 0 1 0 1 0 1 0 2 3 4 5 6 P R O D U C T I O N V O L U M E / Y E A R

  9. 62 mm 5500 kg/km 21mm 363 kg/km 448 copper pairs 648 optical fibres Cabling technologies : feeder section Low diameter, low weight, high density optical cables are available Cost of standard G652 fibre in cable is about 2 times the copper pair’s

  10. Cabling technologies : drop & CPN Need for cables with few single mode fibres - hard environment - today G652 fibre diameter bend : 60 to 40 mm - improved fibre : less sensitive to strain, new coatings à 20 mm target Alternative fibres : - Multimode silica fibre - Plastic clad silica fibre - Plastic fibre easy to connect (indoor use) - fibre still at evaluation stage - cost? easy to connect

  11. Cabling technologies Installation with blowing techniques (ANCIT workshop) First patents from BT : blowing of optical fibre unit - up to 6 fibres - range: up to 800 meters Extended to cables pulling/blowing - range : up to 2400 meters

  12. Cabling technologies Micro cable micro civil work Micro Cabling System from Siemens (ANCIT workshop)

  13. Cabling technologies Connectors : field mounting is recognised as a critical issue Innovations are expected : - simplified mounting procedure - ceramic ferrule replaced by glass, plastic - ferrule-less connector - multi-fibre connectors, miniaturisation - easy fibre preparation, polishing (?) Splices - fusion : preferred by most operators but high cost (40$) - mechanical : under field test Advanced solutions : - MT - RJ system - VF- 45 - SC Light Crimp - Optoclip

  14. P L A N A R G L A S S FIBRE PLC P L A N A R G L A S S FIBRE FIBRE PLC Cabling technologies : splitters 3 technologies : - fibre - planar glass - PLC - High cost : 50 EURO per port COST (EURO) - Location is still an open question - in the field (near customer premises) - at local exchange QUANTITIES

  15. Point to Point ONU OLT ONU Point to Multipoint ONU OLT ONU Splitter in the exchange • Point to Multipoint ONU OLT OLT ONU Splitter in the outside plant A comparison study: P to P / P to MP NOC’98 (Manchester, UK)

  16. Optoelectronic systems Fibre infrastructure Installation techniques Initial cost estimated case 3 cheaper O&M Service Provision Network Upgrading Cost evaluation difficult strategic functionalities Functional comparison 120.00 100.00 80.00 60.00 Evaluation factor (arbitr. units) 40.00 20.00 0.00 Case 1 P to P Case 2 P to MP Splitter in LEX Case 3 P to MP Splitter outside

  17. l m Filter to stop Hardware monitoring based on OTDR Outside plant Local exchange l s F OLT Rm F ONU OS l m l s OTDR l m To other PONs Control OS : Optical selector Rm Reference reflection WDM l m( 1600-1650 nm window )

  18. WDM opportunities in access WDM is booming in trunk networks. What’s about in access? • Where WDM could be used in the access network? • What are the drivers for WDM? • How WDM could be implemented in the access network? • Is WDM technology ready for access application ? (WDM lite) • What economical advantages could be foreseen using WDM? • What could be suggested to Network Operators today?

  19. subscribers LEX LEX 100.000 CC level 1 < 50 km 10.000 level2 < 10 km 200 < 1 km level 3 Customer Premises LAN level 4 FTTB/F/O FTTB/H FTTCab HFC Radio HFR WDM in access : where? why? when? Capacity upgrade Short term Capacity upgrade Service separation Long term Dedicated l Short/mid term

  20. ADSL : hardware analysis • Modems are mainly based on silicon technology • Basic functions : • analogue/digital converter, DSP, interfaces ==> 3 to 5 chips, ~3 million transistors, CMOS 0.5- 0.35µm, < 100$ • splitter, protection (passive components) Today value

  21. ADSL : hardware analysis • Copper network ability to support ADSL depends on historical practices • most European networks length fits quite well • uncertainties rely on : • cable gauge, insulation, design, bridged taps • installation in duct, buried, aerial Testing quality & performance is becoming a critical issue • Indoor cabling • first trials lesson is : ‘‘to be drastically simplified’’... • ‘low disturbance’ solutions recommended

  22. Power Lines communications Transmission of data on low voltage electricity distribution network Foreseen domains of applications : Outdoor Indoor BASE STATION TOWARD CORE NETWORK COAX or FIBRE METER COAX ADAPTORS TRANSFORMER MV/LV POWER LINE CABLES

  23. PLC: first view, open questions • Outdoor : could be an alternative but... • technical feasibility announced, but not clearly demonstrated • limited bandwidth : ~1Mbit/s shared with (200-250) customers connected to the same MV/LV transformer • many noise sources: household appliances, radio-amateur • variable cable impedance • EMC, standardisation & cost issues to be addressed • field trials need co-operation with electricity suppliers A Wooden Horse among Telcos? • Indoor : products are available for low data rate applications

  24. Conclusions Which broadband technologies for access ? • ADSL : ready now for large scale deployment • Fibre based solutions for : • customers whose demand can’t be satisfied with ADSL • business : FTTB/F/O • SOHO & residential : FTTCab/H - HFC, HFR • green field areas, infrastructure renewal • PLC : immaturewith today knowledge

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