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Broadband Over Power Line

Broadband Over Power Line. National Telecommunications and Information Administration U.S. Department of Commerce May 25, 2005. Scope. BPL in the Context of Power Line Emissions* Findings Of NTIA BPL Phase 1 Study* Subsequent Technical Findings* Framework of FCC BPL Rules

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Broadband Over Power Line

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  1. Broadband Over Power Line National Telecommunications and Information Administration U.S. Department of Commerce May 25, 2005

  2. Scope • BPL in the Context of Power Line Emissions* • Findings Of NTIA BPL Phase 1 Study* • Subsequent Technical Findings* • Framework of FCC BPL Rules • NTIA’s On-going Study Priorities ___________ *See www.ntia.doc.gov, publications, NTIA BPL Phase 1 Report andComments to FCC

  3. BPL in the Context of Power Line Emissions • Without BPL, power line emissions exceed FCC Part 15 field strength limits and interfere in some cases • Diagnosis and repair of noise emissions can be time-consuming and costly • Some federal radio operators routinely police local power lines for noise emissions, diagnose high emission levels, and work cooperatively with the utility or electricity user to eliminate interference

  4. Some Receiver Antennas are Close to Power Lines

  5. NTIA BPL Study Findings • NTIA Coordinated its studies with FCC/OET • BPL (and other) power line radiated emissions do not emanate from a point source • Multiple points sources (impedance discontinuities) • Traveling wave modes of high radiation intensity • Measurements & modeling • Radiation and local groundwave propagation - Numerical Electromagnetics Code (NEC) ver. 4.1 • Local spacewave propagation toward aircraft – Matlab model using NEC radiation predictions • HF ionospheric propagation - VOACAP software • Phase 1 study addressed potential local interference

  6. Example NEC Analysis(Spatial Distribution of E Field)

  7. Distances From BPL Power Lines Within Which Interference Is Likely Desired Signal Level Service

  8. NTIA Phase 1 Study Findings • Many interference prevention and mitigation techniques exist: advance consultations and BPL frequency agility • Greatest interference risks stem from compliance measurement provisions: • In situ measurement procedures not well defined (ANSI C63 and CISPR 16 & 22) • Irregular spatial distribution of field strength greatly complicates compliance measurements

  9. Subsequent Study Findings • Relatively high levels of field strength are spatially confined • A practical compliance measurement procedure for Access BPL systems can reliably identify the field strength level that is not exceeded at 80% of possible receiver antenna locations at the specified measurement distance from the radiating structure – this is the procedure that was specified in the FCC Report & Order • Ionospheric propagation and aggregation of BPL emissions is not a near-term issue: millions of BPL devices can be deployed before the onset of any such interference problem  Should not delay rulemaking for further study

  10. Framework of FCC BPL Rules • Access BPL emission frequencies must be fungible • Access BPL devices are subject to certification • In-House BPL compliance measurement procedures improved via requirement to measure along outdoor power service lines

  11. NTIA’s On-Going Study Priorities • Update interference risk analyses based on new FCC rules for Access BPL systems • Provide additional guidance: • Prevention of interference • Suspected interference • Prevention of significant noise floor increase via ionospheric propagation

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