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<p><b>IEEE 802.15.4</b> is a technical standard that defines the operation of a <b>low-rate wireless personal area network</b> (<b>LR-WPAN</b>).  It specifies the <a href="page.php?w=physical_layer">physical layer</a> and <a href="page.php?w=media_access_control">media access control</a> for LR-WPANs, and is maintained by the <a href="page.php?w=IEEE_802.15">IEEE 802.15</a> working group, which defined the standard in 2003.  It is the basis for the <a href="page.php?w=Zigbee">Zigbee</a>, <a href="page.php?w=ISA100.11a">ISA100.11a</a>, <a href="page.php?w=WirelessHART">WirelessHART</a>,</p><p>
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