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<p>communications technologies. The systems divide the region covered into multiple geographic areas. Each area has a low-power transmitter or radio relay antenna device to relay calls from one area to the next area.<br/>
*Radio and <a href="page.php?w=spread_spectrum">spread spectrum</a> technologies&nbsp;- Wireless local area networks use a high-frequency radio technology similar to digital cellular and a low-frequency radio technology. Wireless LANs use spread-spectrum technology to enable communication between multiple devices in a limited area.</p><p>
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