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Power Line Communications (PLC) is the ability to use the existing power line
infrastructure, either within a building or on the distribution grid, to send and
receive data for the purposes of communications.
PLC is typically used to enable communications to electronic devices, such as
appliances, utility meters, lighting control systems, heating ventilation and air
conditioning units, and virtually any device that is connected to power. In
addition, PLC can be used to enable the "last mile" communication, from the
pole-top to a residence.
Given the ability to communicate reliably in these situations, there are great
opportunities and potential for convenience and cost-saving
applications.
The following excerpt is taken directly from the thesis by L. Selander refered to above.
This chapter from the thesis provides a detailed explanation of power line communications;
what it is and what it involves. As well, it gives information about a real world installation
and application of power line communications
"Chapter 1 - Introduction"