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In-house cabling solutions

ANCIT Torino, 30-31 March 1998. In-house cabling solutions. Giuseppe A. AZZINI, Francesco CAVIGLIA, Giuseppe GALLIANO and Adler TOFANELLI CSELT S.p.A. Torino - Italy. Summary. Introduction The services for the residential customers Home network topologies

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In-house cabling solutions

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  1. ANCIT Torino, 30-31 March 1998 In-house cabling solutions Giuseppe A. AZZINI, Francesco CAVIGLIA, Giuseppe GALLIANO and Adler TOFANELLI CSELT S.p.A. Torino - Italy

  2. Summary • Introduction • The services for the residential customers • Home network topologies • Cabling solutions for the new buildings • Cabling solutions for already existing buildings • Cables and components • Economical evaluation • Conclusions

  3. Why “In-house cabling” is so important • Strong impact on the final residential customer for: • costs • unaesthetic presence of cabling infrastructures • The success of the new services depends on customer premises cabling issues • The solution are: • infrastructure/wiring guidelines for new buildings • suitable cabling systems for already existing buildings • new technologies for providing services (radio, use of power wiring...)

  4. Services • The Italian present situation • POTS • ISDN • TV (Terrestrial Radio Broadcast) • CATV (HFC network) • SAT-TV (Satellite Radio Broadcast) • The future • Evolution of the already existing services • Switched Digital Video Broadcasting (SDVB) using xDSL techniques • Fast Internet (xDSL, Cable Data Modem, satellite access...) • Home automation • ?

  5. Modem Services present situation = ISDN NT = POTS = TAP coax coax POTS ISDN Twisted pairs FN coax HFC network

  6. CDM = xDSL NT New services = ISDN NT = POTS = Combiner/splitter = TAP coax coax POTS xDSL xDSL ISDN ISDN Twisted pairs POTS FN coax HFC network

  7. Home Network Topologies • Star • SDVB, Fast Internet (ATM 25 Mbit Ethernet) • POTS (not in Italy) • More flexible • Bus • POTS (Italian Specs.) • ISDN (S-Bus) • TV/CATV Satellite (most used in Italy) • Minimum wiring length

  8. Cabling solutions for new buildings • Guidelines for the new infrastructures • Choice between: • “infrastructure-only” approach (ducts and outlets position) • “wiring” approach (type and number of cable to each outlet) • In-chase ducts are mainly used (for brick walls) • Critical issues are the number of outlets and the ducts dimension (number of installed cables for the second approach)

  9. Italian guidelines for new buildings • “Infrastructure only” approach • Star for future Broadband services (20 mm tube, 1 outlet/room) • Bus for POTS and ISDN (20 mm tube, 1 outlet/room) • Presence of a box at the star centre size: (300x200x80 mm) • The convenience for ducts larger than 20 mm is under consideration A 20 mm duct completed filled

  10. U.S.A. national standard (draft EIA/TIA 570)“Residential Telecommunications cabling standard” • “Wiring” approach • Star topology • 3 different cabling grades Grade 1 : 1 x 75 W coax 2 x twisted pair (UTP cat.3) Grade 2 : 2 x 75 W coax1 x 4 twisted pair (UTP cat.3) Grade 3: 2 x 75 W coax 2 x 4 twisted pair (UTP cat.5)optical fibres (optional) • Wall space at the star centre for a distribution device(e.g. 0.8x0.9 m for a grade 2cabling) • “Wiring” approach requires the installation of a large number of cables • Rules coordinated with the “Residential Gateway” approach

  11. Cabling solutions for Existing Buildings • In-chase ducts technique is not viable for costs and inconveniences • Suitable techniques are: • raceways • Wall direct riveting • The main purpose is to provide the link when needed: • Raceway solution allows a sharing of the infrastructure for future upgrading • Raceways have a stronger aesthetic impact but new products are coming • No strong differences among cable types (optical, UTP, coax..)

  12. 5 MHz 1 GHz ³ 2.5 GHz ~1 MHz 5 MHz 1 GHz Coaxial Cables and Components Used for CATV distribution (5 -1000 MHz) Opportunity: Open to the satellite band But: Cost increase Opportunity: Open to low frequency But: Non standard VDSL signals branching devices

  13. Coaxial cabling used for low frequencyVDSL signals (e.g. DAVIC solution) TAP COMBINER Oultlet Outlet Set top box TV CATV(50 MHz to 1 GHz) Outlet PC VDSL terminal VDSL (1 to 30 MHz)

  14. Silica or Plastic Optical Fibres and connectors • Silica Fibre for low cost applications: multimode 62.5 mm • Good transmission performances • Low cost connectors are appearing on the market • Step index Plastic Optical Fibre • Acceptable transmission performances • Easy to be connected (low cost)

  15. Aramidic yarns (e.g. Kevlar) About 1 mm 3.8 mm Optical cables for residential applications FO have small intrinsic dimensions, but require adequate protection The optimum cable structure depend on the installation method • Cables to be pulled in ducts • Tensile resistance is important • Cables to be installed in raceways • Small size is important • Cables for direct riveting to wall • Crush resistance is important • Under carpet cables • Flat, good crush resistance Coiled steel

  16. An economical evaluation • The economical impact of the cabling for broadband (BB) outlets using: • Different Infrastructure solutions • In-chase ducts (a new building with pre-installed ducts is presumed) • Raceways • Wall riveting • Different cables • UTP (Cat. 5) • Silicon multimode fibre (62.5 mm core) • Plastic Optical Fibre • Evaluation based on an example with: • Installation of 2 BB outlets (at time 1) and 2 further BB outlets (at time 2)

  17. 600 400 200 0 Ducts UTP Raceway Si Fibre Wall POF An economical evaluation (2 outlets) • Time 1 - Total cost (in Euro) for two BB outlet • The cost for the Ducts solution includes the cost of pre-installed ducts for 8 potential outlets (325 Euro)

  18. 600 400 200 0 Ducts UTP Raceway Si Fibre Wall POF An economical evaluation (upgraded to 4 outlets) • Time 2 - Total cost (in Euro) after the addition of 2 further BB outlets • The cost for the Ducts solution includes the cost of pre-installed ducts for 8 potential outlets (325 Euro)

  19. An economical evaluation (discussion) • In-chase ducts solution is the more expensive.(However: most of the cost is in the pre-installed duct infrastructure, that often can be regarded as an investment, as it grants elasticity and increases the value of the the house) • Direct wall riveting is the cheaper solution • The Si Fibre solution appears to be more expensive than UTP or POF solution.(However: the difference arises from the cost of connectors;the foreseeable venue of cheaper connectors will close the gap) • The cost does not strongly depend on the physical carrier (UTP, Si fibre, POF); hence the driving force in choosing it is not the economical aspect

  20. Conclusions • For the in-house-cabling, three main techniques are available: in-chase ducts, raceways, direct riveting • For new building the future development of the services requires a guideline on the cabling infrastructure • For already existing building only raceway and direct riveting are applicable, but with a negative impact on the aesthetic • The costs of the in-chase ducts technique are higher than the others, but with advantages in elasticity and aesthetic • The cost of the cabling does not notably depend on the physical carrier (UTP, Si fibre or POF)

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