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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

Hybrid Information Society local access infrastructure including PLT Technology

Power line communication or power line carrier (PLC), also known as Power line Digital Subscriber Line (PDSL), mains communication, power line telecom (PLT), or power line networking (PLN), is a system for carrying data on a conductor also used

for electric power transmission. Broadband over Power Lines (BPL) uses PLC by sending and receiving information bearing signals over power lines to provide access to the Internet.

All power line communications systems operate by impressing a modulated carrier signal on the wiring system. Different types of powerline communications use different frequency bands, depending on the signal transmission characteristics of the power wiring used. Since the power wiring system was originally intended for transmission of AC power, in conventional use, the power wire circuits have only a limited ability to carry higher frequencies. The propagation problem is a limiting factor for each type of power line communications.

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

Comparison between PLT and other relevant technologies

• 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

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

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

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

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

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

PLTopens 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

THANK YOU!!!