Chapter6 powerline

  • 13 trang
  • file .pdf
Power Line
Chapter 6
Powerline Network
Korea-Vietnam Friendship IT College
Power Line
Overview
• Introduction
• Broadband over Powerline (BPL)
technology
• Equipments
• Standards
2
Korea-Vietnam Friendship IT College
Power Line
Introduction
• Broadband over power line is a method for sending high-
speed communications information over electric utility
lines.
3
Korea-Vietnam Friendship IT College
Power Line
Benefits
• No more wires, just plug in
• Share your internet connection with other home devices
• Move your computer anywhere you want to in your
house
• Easy to install
• High transmission rate
– Up to 100Mbps
• Secure data-encryption
• Utilizes existing power source
4
Korea-Vietnam Friendship IT College
Power Line
Broadband over Powerline technology
End-to-end BPL technology
5
Korea-Vietnam Friendship IT College
Power Line
Broadband over Powerline technology
• Through "conditioning" of the existing electricity
infrastructure, electrical utilities can transmit regular low
frequency signals at 50 to 60Hz and much higher
frequency signals above 1MHz without affecting either
signal. The lower frequency signals carry power, while
the higher frequency signals can transmit data
6
Korea-Vietnam Friendship IT College
Power Line
Broadband over Powerline technology
• The signal modulation technique used in Access BPL is
OFDM (Orthogonal Frequency Division Multiplexing).
• The important characteristic of OFDM is its ability to
spread the data signals over a much greater bandwidth
allowing it to adaptively overcome noise in the
communication system.
7
Korea-Vietnam Friendship IT College
Power Line
Equipments
• Base station server
• Conditioning Unit
• Service Unit
8
Korea-Vietnam Friendship IT College
Power Line
Base Station Server
• Designed for basic street electrical cabinets
• Typically, one street cabinet contains 12 base station
units
• Base stations typically serve approximately 50 customers
• The server operates via IP to create a LAN type
environment for each local service area
9
Korea-Vietnam Friendship IT College
Power Line
Conditioning Unit
• Placed near the electric meter at each customer’s home
• The CU uses band pass filters to separate the electricity
and data signals
10
Korea-Vietnam Friendship IT College