Power lines can be used to transmit data through a technology called Power Line Telecommunications (PLT). PLT takes advantage of the fact that power lines already connect to nearly every building. It provides new services like remote electricity meter reading and broadband internet that are difficult for other technologies to implement. While power lines offer widespread connectivity and support growing information services, PLT has seen limited adoption due to a lack of standardization, unclear business incentives, and some interference and security concerns. Broadband over Power Lines (BPL) sends high-speed internet over power lines either within a home or as the main access method, but can face problems with equipment interference and responsibility for radio disruptions. More development is still needed to improve PLT

1. TRANSMISSION OF DATA OVER
ELECTRIC POWER LINES

2. INTRODUCTION
Power Line Telecommunications (PLT)
• aims at the utilization of the electricity power lines for
the transmission of data
• gains importance that every building is connected to the
power grid that cannot be matched by either the
telecommunications or cable TV wiring
• provides new services to the users, which are difficult to
implement by other technologies, e.g., remote electricity
meter reading, broadband over internet and many

3. Hybrid Information Society local access infrastructure
including PLT Technology

4. RELEVANCE OF PLT
The power grid
Is ubiquitous
offers last-mile connectivity
supports information-based services with strong
growth potential
Is already in place, thus enhancing cost-
effectiveness
Three main categories of new ICT-based
applications --Energy Services, Telecommunication
services, A New category of value-added customer
services

5. Comparison between PLT and other relevant technologies

6. WHY LIMITED EXPLOITATION?
• PLT technology is young and still evolving; its capabilities
still need expansion
• There is a lack of standardization and interoperability of
PLT-relevant products
• commercial incentives to exploit such a telecom
infrastructure as PLT not yet been clear
• Increased PLT transfer speed and reliability

7. BROADBAND OVER POWER LINES
Broadband over power lines (BPL)
• Can plug the computer into any electrical outlet in the
home, instantly have access to high-speed Internet
• Tested in several cities around the United States and the
United Kingdom
Two types of BPL service
• In-House BPL
• Access BPL

8. BROADBAND TO HOME
electricity and the RF used to transmit data vibrate at certain
frequencies
If electricity spikes at a frequency that is the same as the RF
then it will cancel out that signal and the data transmission
will be damaged en route
BPL bypasses this problem by using medium-voltage lines --
the data can only travel so far before it degrades

10. BROADBAND TO HOME
special devices installed called repeaters take in the data and
repeat it in a new transmission, amplifying it for the next
journey
CT coupler allows the data on the line to bypass transformers
Transformer's job is to reduce the 7,200 volts down to the
240-volt standard
some carry the signal in with the electricity on the power line,
while others put wireless links on the poles and send the
data wirelessly into homes

11. PROBLEMS FOR PLT USERS
• could cause malfunctions of your electrical equipment,
such as battery chargers, audio-video systems
• causes interference to important radio services, the user
might be held responsible for the damage
• Since all users share the same physical access, data
sniffing can be done and security is a problem
• achievable bandwidth and download rate is significantly
lower than customers expect
• To receive telecommunication services and energy from
the same company will create a dangerous new monopoly

12. RECENT DEVELOPMENTS
More work required in the area of PLT hardware product
development, production of appropriate standards and new
software applications
– improvements both in terms of capabilities (speed,
reliability), investment and exploitation costs,
interoperability
– wide range of advanced software application in need of
further investigations and field tests
– A number of associated regulatory and standardization
problems for commercialization

13. CONCLUSION
PLT
opens up new opportunities for the mass provision of local,
last-mile access at a reasonable cost
offers a permanent on-line connection, as symmetric, two-
way communication, has good performance, very good
geographical coverage, relatively cheap
Faces problems -- PLT as a provider of the local access
infrastructure,PLT-based development of applications and
services
play a significant role as a provider of necessary Information
Society local infrastructure

14. REFERENCES
www.howstuffworks.com
www.metering.com
www.wikepedia.org

15. THANK
YOU!!!