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Typically transformers prevent propagating the signal, which requires multiple technologies to form very large networks. Various data rates and frequencies are used in different situations. A number of difficult technical problems exist between wireless and power-line communication, notably those of spread spectrum radio signals operating in a crowded environment. Radio interference, for example, has long been a concern of amateur radio groups.
This article needs to be updated. Please update this article to reflect recent events or newly available information. Narrowband power-line communications began soon after electrical power supply became widespread.
Consumer products such as baby alarms have been available at at least since 1940. 200 and 800 bits per second.
In the 1970s, the Tokyo Electric Power Co. Since then, there has been a surge of interest in using the potential of digital communications techniques and digital signal processing.