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Broadband Over Power Lines(BPL)

Broadband over power line (BPL) is another high speed data service available to consumers. It uses medium and low voltage power lines to carry broadband data at speeds between 500 Kbps and 3 Mbps. At these data rates BPL is equivalent to and competes with cable and DSL. Access BPL and In-home BPL are both used to deliver data to the consumer over power lines. Access BPL is used to carry data over the medium voltage and low voltage power lines to the customer’s premises. Power companies also use Access BPL to monitor power grids. In-home BPL defines the technology that is used in side the customer premises to transport data. Many devices are available now that can network your home using the electrical wiring in your house.

BLP data can use either Orthogonal Frequency Division Multiplexing (OFDM) or Direct Sequence Spread Spectrum (DSSS) to deliver its signal. OFDM transmits multiple data signals over a wired or wireless system. It uses a spread spectrum technique that “distributes data over a large number of carriers that are spaced apart at precise frequencies”(OFDM Tutorial). ODFM is commonly used in digital broadcasting in Europe, Japan and Australia (OFDM Tutorial). It is also a world-wide standard for asymmetrical digital subscriber line (ADSL). DSSS is a popular and widely recognized form of spread spectrum. The process multiplies a radio frequency carrier and a pseudo-noise digital signal or chipping code. The chipping code, which is a redundant bit pattern for each bit that is transmitted, makes it possible to recover data if it is damaged during transmission (DSSS).

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