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BPL-Broad Band Over Power Lines
By Nanditha Devidasan Reg No:CUAGMCA012 S5 MCA BPL
INTRODUCTION
BPL is a term used to describe the existing electrical lines to provide the medium for high speed communication network.
BPL layers high speed internet access over existing electric wiring.
BPL also known as power line communication is achieved by super imposing voice or data signal onto the line carrier.
BPL also known as powerline telecommunication capable of providing high data rates.
PLB-Power line broad band. BPL
CONTENTS
What is PLC. Working of PLC. PLC Encoding. PLC Backbone. PLC into home. Categories of PLC. Applications. Issues. Advantages. Limitations. Challenges. Conclusions.
BPL
In this figure BPL can be used to inter connect PCs or other devices within a building using the building’s wiring BPL
WHAT IS PLC
PLC or BPL allows transmission of data over power lines.
Power line communications uses the RF signal sent over medium and low voltage AC power lines.
The RF signal is modulated with digital information that is converted by an interface in the home or small business into Ethernet compatible data.
BPL
WORKING OF PLC
Power gridPower grid is a system of high tension cables by which electrical power is distributed through out a region. Power grid also uses generators, substations, transformers and other distributors that carry electricity from the power plant all the way to a plug in the wall. Power is generated at Power stations and distributed around a medium to large geographical area via HV lines or High Voltage lines. In areas where power needs to be distributed to consumers transformers will be used to convert this high voltage into a lower voltage for transport over MV or Medium Voltage lines. These transformers are generally located at electrical substations operated by the utility or power supplier. Such medium voltage lines will be used to transport electricity around smaller geographical areas such as towns and small countries etc. BPL
BPL
A typical BPL system consists of four basic functions.
The injector is used to put the internet protocol signal onto the power line. The repeater is used to boost the signal. The extractor is used to take the internet protocol signal off the power line. The modem is used to transfer the internet signal from the power outlet to the computer. BPL
BPL
BPL modems
The BPL modem simply plugs into the wall and then into your computer. These modems are capable of speeds comparable to DSLBPL or cable modems.
PLC Encoding Various encoding schemes.
GMSk- Used with Single Carrier Version of PLC providing low bandwidth<1MB.
CDMA-Used with single carrier version of PLC providing low bandwidths<1MB
OFDM-Used with the multi carrier version of PLC providing a bandwidth of 45MB.
BPL
PLC Back bones
BPL
PLC into HOME There are 2 means getting the broadband into home from electrical pole.
Using Wireless Device.-One method is to use a wireless device located on the power line to broadcast a radio signal containing the data with a receiver located in the home.
Passing via a transformer.-The alternative is to allow the PLC frequencies to either skip around or pass through the transformer and continue onto the home allowing any devices with PLC connections to be plugged in anywhere in the home. BPL
Categories of PLC or BPL
In building BPL-These BPL systems use the buildings elecrtrical wiring to network computers within a building.
Access BPL-Access BPL uses electrical distribution lines.
Control BPL- This control BPL operates below 500khz
BPL
Comparison
ISDN
Cable Modems
DSL
PLC
Twisted Pair
Coaxial Cable
Twisted Pair
Electrical Power Lines
Transmission Media
Capacity
Connection
128Kbps 2 X 64kbps B Channels 1 x 16kbps D Channel for signalling online
Theoretical carrying capacity of coax is hundreds of times greater than twisted pair. However the full capacity of the cable is not available for data users
ADSL providers give specific statements about the bandwidth e.g. 1Mbps Downstream, 256Kbps Upstream and generally achieve 80% of it consistently.
PLC now supports higher data rates such as 45Mbps.
Dedicated
Shared
Dedicated
Shared
Availability
On demand only
Not everyone has cable but if you do have cable and the cable company provides internet access you can get it.
Most people have telephones but not all users are close enough to their end office to get ADSL.
Power Grid is everywhere.
Security
Dedicated Connection so it is reasonably secure.
Any cable user can easily read all the packets going down the cable. l.
Secure as ADSL is a point-topoint medium.
Reliability
Telephone network is generally more reliable than cable. .
With cable, if the power goes to any amplifier along the line, all downstream users are cut off instantly.
Telephone network is generally more reliable than cable.
If the power goes down, obviously no data will be sent.
Advantages
-Mature and Robust -Widely Available (in urban areas)
-Excellent Performance -Permanently on-line
-Good performance -Permanently on-line
-Good Performance -Permanently on-line -Good geographical coverage
-Expensive for consumer market -On demand only
-Limited geographical coverage -currently only available BPL in certain areas -contention based
-Length of local loop affects performance -contention based (different ISP’s have different contention ratios
Disadvantages
Latest PLC technology uses secure data encryption.
-Still at development stage -Has no significant customer base yet
APPLICATIONS In house applications-These applications occur within a single building with both ends of the communications link within the same building. The building might be a house, an apartment block or an office building. The path over which the transfer of data occurs within these buildings is relatively short - typically it is less than 100 m between devices. Systems using higher These applications occur within a single building with both ends of communications.
Last –Mile-These applications typically include the distribution to the home or office of Internet and other services by broadband service suppliers. In addition to broadband Internet connections, these broadband distribution systems are intended to also provide voice (IP telephony), video (VHS video quality), surveillance systems, entertainment (gaming) and utilities metering (electricity/water/gas) services BPL
ISSUES
Compatibility between private and public works
Telecommunications policy issues.
Radio communication issues.
BPL
ADVANTAGES PLC provides many advantages for providers of the service and also more importantly for the end users of the service. Coverage-A power grid is every where.
The equipment needed to set-up PLC is cheaper than that of DSL and cable modems.
Using existing power outlets in home making is easier to set up.
For users in rural areas ,who cannot receive DSL or cable modems PLC can provide an all in one service.
BPL
Electric Internet Benefits.
Affordable-uses existing electrical wiring.
Easy to use-No software is necessary simply plug and play.
Reliable-It provides universal coverage.
Fast-6 million bits per second. BPL
LIMITATIONS
Media limitations. Distances. Equipment. Cost. Competition. Security.
BPL
CHALLENGES Economic model is still somewhat unproven. Technology will need more testing. -Testing for manufacturability, reliability. The technology is not future proof. Radio interference-, if large scale, may shut off the technology very quickly.. Other competing wireless broadband technologies have great promise and big backers. BPL
CONCLUSION
BPL is only one of many technologies for delivery of highspeed data communications for Internet access.
BPL may potentially be used as the communications solution for numerous Utility Applications.
BPL offers a potential new alternative for broadband Internet services.
BPL systems deliver high-speed data services over the existing power lines by conduction of radio frequency energy BPL
REFERENCES http://www.antennex.com/shack/Aug03/plc.htm http://www.lonestarbroadband.org/technology/powerlines.htm http:// www.wikipedia.org http://www.homeplug.org http://www.linksys.com
BPL
Thank You
BPL
By Nanditha Devidasan Reg No:CUAGMCA012 S5 MCA BPL
INTRODUCTION
BPL is a term used to describe the existing electrical lines to provide the medium for high speed communication network.
BPL layers high speed internet access over existing electric wiring.
BPL also known as power line communication is achieved by super imposing voice or data signal onto the line carrier.
BPL also known as powerline telecommunication capable of providing high data rates.
PLB-Power line broad band. BPL
CONTENTS
What is PLC. Working of PLC. PLC Encoding. PLC Backbone. PLC into home. Categories of PLC. Applications. Issues. Advantages. Limitations. Challenges. Conclusions.
BPL
In this figure BPL can be used to inter connect PCs or other devices within a building using the building’s wiring BPL
WHAT IS PLC
PLC or BPL allows transmission of data over power lines.
Power line communications uses the RF signal sent over medium and low voltage AC power lines.
The RF signal is modulated with digital information that is converted by an interface in the home or small business into Ethernet compatible data.
BPL
WORKING OF PLC
Power gridPower grid is a system of high tension cables by which electrical power is distributed through out a region. Power grid also uses generators, substations, transformers and other distributors that carry electricity from the power plant all the way to a plug in the wall. Power is generated at Power stations and distributed around a medium to large geographical area via HV lines or High Voltage lines. In areas where power needs to be distributed to consumers transformers will be used to convert this high voltage into a lower voltage for transport over MV or Medium Voltage lines. These transformers are generally located at electrical substations operated by the utility or power supplier. Such medium voltage lines will be used to transport electricity around smaller geographical areas such as towns and small countries etc. BPL
BPL
A typical BPL system consists of four basic functions.
The injector is used to put the internet protocol signal onto the power line. The repeater is used to boost the signal. The extractor is used to take the internet protocol signal off the power line. The modem is used to transfer the internet signal from the power outlet to the computer. BPL
BPL
BPL modems
The BPL modem simply plugs into the wall and then into your computer. These modems are capable of speeds comparable to DSLBPL or cable modems.
PLC Encoding Various encoding schemes.
GMSk- Used with Single Carrier Version of PLC providing low bandwidth<1MB.
CDMA-Used with single carrier version of PLC providing low bandwidths<1MB
OFDM-Used with the multi carrier version of PLC providing a bandwidth of 45MB.
BPL
PLC Back bones
BPL
PLC into HOME There are 2 means getting the broadband into home from electrical pole.
Using Wireless Device.-One method is to use a wireless device located on the power line to broadcast a radio signal containing the data with a receiver located in the home.
Passing via a transformer.-The alternative is to allow the PLC frequencies to either skip around or pass through the transformer and continue onto the home allowing any devices with PLC connections to be plugged in anywhere in the home. BPL
Categories of PLC or BPL
In building BPL-These BPL systems use the buildings elecrtrical wiring to network computers within a building.
Access BPL-Access BPL uses electrical distribution lines.
Control BPL- This control BPL operates below 500khz
BPL
Comparison
ISDN
Cable Modems
DSL
PLC
Twisted Pair
Coaxial Cable
Twisted Pair
Electrical Power Lines
Transmission Media
Capacity
Connection
128Kbps 2 X 64kbps B Channels 1 x 16kbps D Channel for signalling online
Theoretical carrying capacity of coax is hundreds of times greater than twisted pair. However the full capacity of the cable is not available for data users
ADSL providers give specific statements about the bandwidth e.g. 1Mbps Downstream, 256Kbps Upstream and generally achieve 80% of it consistently.
PLC now supports higher data rates such as 45Mbps.
Dedicated
Shared
Dedicated
Shared
Availability
On demand only
Not everyone has cable but if you do have cable and the cable company provides internet access you can get it.
Most people have telephones but not all users are close enough to their end office to get ADSL.
Power Grid is everywhere.
Security
Dedicated Connection so it is reasonably secure.
Any cable user can easily read all the packets going down the cable. l.
Secure as ADSL is a point-topoint medium.
Reliability
Telephone network is generally more reliable than cable. .
With cable, if the power goes to any amplifier along the line, all downstream users are cut off instantly.
Telephone network is generally more reliable than cable.
If the power goes down, obviously no data will be sent.
Advantages
-Mature and Robust -Widely Available (in urban areas)
-Excellent Performance -Permanently on-line
-Good performance -Permanently on-line
-Good Performance -Permanently on-line -Good geographical coverage
-Expensive for consumer market -On demand only
-Limited geographical coverage -currently only available BPL in certain areas -contention based
-Length of local loop affects performance -contention based (different ISP’s have different contention ratios
Disadvantages
Latest PLC technology uses secure data encryption.
-Still at development stage -Has no significant customer base yet
APPLICATIONS In house applications-These applications occur within a single building with both ends of the communications link within the same building. The building might be a house, an apartment block or an office building. The path over which the transfer of data occurs within these buildings is relatively short - typically it is less than 100 m between devices. Systems using higher These applications occur within a single building with both ends of communications.
Last –Mile-These applications typically include the distribution to the home or office of Internet and other services by broadband service suppliers. In addition to broadband Internet connections, these broadband distribution systems are intended to also provide voice (IP telephony), video (VHS video quality), surveillance systems, entertainment (gaming) and utilities metering (electricity/water/gas) services BPL
ISSUES
Compatibility between private and public works
Telecommunications policy issues.
Radio communication issues.
BPL
ADVANTAGES PLC provides many advantages for providers of the service and also more importantly for the end users of the service. Coverage-A power grid is every where.
The equipment needed to set-up PLC is cheaper than that of DSL and cable modems.
Using existing power outlets in home making is easier to set up.
For users in rural areas ,who cannot receive DSL or cable modems PLC can provide an all in one service.
BPL
Electric Internet Benefits.
Affordable-uses existing electrical wiring.
Easy to use-No software is necessary simply plug and play.
Reliable-It provides universal coverage.
Fast-6 million bits per second. BPL
LIMITATIONS
Media limitations. Distances. Equipment. Cost. Competition. Security.
BPL
CHALLENGES Economic model is still somewhat unproven. Technology will need more testing. -Testing for manufacturability, reliability. The technology is not future proof. Radio interference-, if large scale, may shut off the technology very quickly.. Other competing wireless broadband technologies have great promise and big backers. BPL
CONCLUSION
BPL is only one of many technologies for delivery of highspeed data communications for Internet access.
BPL may potentially be used as the communications solution for numerous Utility Applications.
BPL offers a potential new alternative for broadband Internet services.
BPL systems deliver high-speed data services over the existing power lines by conduction of radio frequency energy BPL
REFERENCES http://www.antennex.com/shack/Aug03/plc.htm http://www.lonestarbroadband.org/technology/powerlines.htm http:// www.wikipedia.org http://www.homeplug.org http://www.linksys.com
BPL
Thank You
BPL
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