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<p>is refreshed. Therefore, the signal is filtered out from the power line, <a href="page.php?w=Signal_modulation">demodulated</a> and modulated on a new <a href="page.php?w=carrier_frequency">carrier frequency</a>, and then injected into the power line again. As PLC signals can span long distances (several hundred kilometers), such facilities only exist on very long power lines using PLC equipment.</p>

<p><big> Power-line carrier communication </big></p>
<p>Power-line carrier communication (PLCC) is mainly used for <a href="page.php?w=telecommunication">telecommunication</a>,</p><p>
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