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Broadband over Power lines. by Jayesh Chi Bun Mummoorthy CS 536 – October 22, 2004. Broadband over power lines (BPL). FCC approved last week: power utilities free to carry data on electrical wires to provide broadband services Benefits

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Broadband over power lines l.jpg

Broadband over Power lines

by

Jayesh

Chi Bun

Mummoorthy

CS 536 – October 22, 2004


Broadband over power lines bpl l.jpg
Broadband over power lines (BPL)

  • FCC approved last week: power utilities free to carry data on electrical wires to provide broadband services

  • Benefits

    • Better coverage than phone and cable (e.g. small towns and rural areas)

    • Faster deployment

    • May lower the price

  • Challenges

    • EM interference to various radio signals

      • System to monitor interference,

      • Restrict service in areas where could affect public safety

    • High-voltage and fluctuation can corrupt data

      • Clean data stream if power down to 7000V


How stuff works l.jpg
How Stuff Works?

  • Medium

    • Fibers / Phone lines (to skip disruptive high-voltage lines)

    • Medium voltage wires

  • PHY

    • RF (bundled w/ AC)

    • 4.3MHz – 20.9MHz

    • 84 carriers

    • OFDM

  • MAC

    • CSMA/CA

    • virtual carrier sense

    • contention resolution

    • Encoding: DQPSK

    • Error detection/correction: FEC, ARQ


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How Stuff Connected?

  • How to plug in?

    • Wireless router on poles

    • Special adaptor/modem plugged into electrical outlets

  • Data rates

    • Homeplug Powerline Alliance: 14Mbps

    • Amperion: currently 20Mbps, 100Mbps next year

    • CVEC: claims 256Mbps bidirectionally

  • Prices

    • Amperion: $19/mo

    • Home n/w device: $25

Wall-plugged Ethernet Bridge


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The future

  • Home network

    • Easily create a network via electric outlets

  • Smart electrical grids and devices

    • Read electrical usage

    • Diagnose maintenance problems and feed back

    • Traffic lights, surveillance cams networked instantly

    • Control power use


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Comments on the article & the topic

  • Pros

    • Impact of BPL to broadband providers

    • Provided estimated cost of services

    • Proposed idea of smart electrical devices

  • Cons

    • No technical details about data transmission mechanism over power line

    • No discussion of safety and security

  • Our Opinions

    • +: Alternative to existing network infrastructure

    • +: Opportunity for smart devices

    • -: More trials and testing needed

    • -: Interference problems?

    • -: More at the hands of nature: Rain, Snow, ..

    • -: New medium: Properties of Aluminum wires???

    • -: Will it survive the opposition:

      • ARRL(163,000), FEMA, DERA & many more …


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How Stuff Messed Up?

Short wave/CB: 5.9MHz – 27.41Mhz

Affected FEMA (emergency), ARRL (relay radio)


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