+</blockquote>
+<div class="system-message">
+<p class="system-message-title">System Message: WARNING/2 (<tt class="docutils">txt/tep126.txt</tt>, line 206)</p>
+Block quote ends without a blank line; unexpected unindent.</div>
+<table border="1" class="docutils">
+<colgroup>
+<col width="47%" />
+<col width="53%" />
+</colgroup>
+<tbody valign="top">
+<tr><td colspan="2">Optional 6LowPAN TinyOS Network Layer</td>
+</tr>
+</tbody>
+</table>
+<div class="system-message">
+<p class="system-message-title">System Message: ERROR/3 (<tt class="docutils">txt/tep126.txt</tt>, line 209)</p>
+Unexpected indentation.</div>
+<div class="system-message">
+<p class="system-message-title">System Message: WARNING/2 (<tt class="docutils">txt/tep126.txt</tt>, line 209)</p>
+Blank line required after table.</div>
+<blockquote>
+<div class="line-block">
+<div class="line"><br /></div>
+</div>
+</blockquote>
+<div class="system-message">
+<p class="system-message-title">System Message: WARNING/2 (<tt class="docutils">txt/tep126.txt</tt>, line 210)</p>
+Block quote ends without a blank line; unexpected unindent.</div>
+<table border="1" class="docutils">
+<colgroup>
+<col width="47%" />
+<col width="53%" />
+</colgroup>
+<tbody valign="top">
+<tr><td colspan="2">Carrier Sense Multiple Access (CSMA)</td>
+</tr>
+</tbody>
+</table>
+<div class="system-message">
+<p class="system-message-title">System Message: ERROR/3 (<tt class="docutils">txt/tep126.txt</tt>, line 213)</p>
+Unexpected indentation.</div>
+<div class="system-message">
+<p class="system-message-title">System Message: WARNING/2 (<tt class="docutils">txt/tep126.txt</tt>, line 213)</p>
+Blank line required after table.</div>
+<blockquote>
+<blockquote>
+<div class="line-block">
+<div class="line"><br /></div>
+</div>
+</blockquote>
+<div class="system-message">
+<p class="system-message-title">System Message: WARNING/2 (<tt class="docutils">txt/tep126.txt</tt>, line 214)</p>
+Block quote ends without a blank line; unexpected unindent.</div>
+<div class="system-message">
+<p class="system-message-title">System Message: ERROR/3 (<tt class="docutils">txt/tep126.txt</tt>, line 214)</p>
+<p>Malformed table.</p>
+<pre class="literal-block">
++------------+------------+
+| |
+</pre>
+</div>
+<div class="system-message">
+<p class="system-message-title">System Message: WARNING/2 (<tt class="docutils">txt/tep126.txt</tt>, line 216)</p>
+Blank line required after table.</div>
+</blockquote>
+</blockquote>
+<div class="system-message">
+<p class="system-message-title">System Message: WARNING/2 (<tt class="docutils">txt/tep126.txt</tt>, line 216)</p>
+Block quote ends without a blank line; unexpected unindent.</div>
+<p>+----------+----------+ +----------+----------+
+| ReceiveP | | TransmitP |
++----------+----------+ +----------+----------+</p>
+<div class="system-message">
+<p class="system-message-title">System Message: ERROR/3 (<tt class="docutils">txt/tep126.txt</tt>, line 219)</p>
+Unexpected indentation.</div>
+<blockquote>
+<div class="line-block">
+<div class="line"><a href="#id7" name="id8"><span class="problematic" id="id8">|</span></a></div>
+</div>
+<div class="system-message" id="id7">
+<p class="system-message-title">System Message: <a name="id7">WARNING/2</a> (<tt class="docutils">txt/tep126.txt</tt>, line 219); <em><a href="#id8">backlink</a></em></p>
+Inline substitution_reference start-string without end-string.</div>
+<div class="system-message">
+<p class="system-message-title">System Message: WARNING/2 (<tt class="docutils">txt/tep126.txt</tt>, line 220)</p>
+Line block ends without a blank line.</div>
+<table border="1" class="docutils">
+<colgroup>
+</colgroup>
+<tbody valign="top">
+</tbody>
+</table>
+<div class="system-message">
+<p class="system-message-title">System Message: ERROR/3 (<tt class="docutils">txt/tep126.txt</tt>, line 221)</p>
+Unexpected indentation.</div>
+<div class="system-message">
+<p class="system-message-title">System Message: WARNING/2 (<tt class="docutils">txt/tep126.txt</tt>, line 221)</p>
+Blank line required after table.</div>
+<blockquote>
+<div class="line-block">
+<div class="line"><br /></div>
+</div>
+</blockquote>
+</blockquote>
+<div class="system-message">
+<p class="system-message-title">System Message: WARNING/2 (<tt class="docutils">txt/tep126.txt</tt>, line 222)</p>
+Block quote ends without a blank line; unexpected unindent.</div>
+<table border="1" class="docutils">
+<colgroup>
+<col width="48%" />
+<col width="52%" />
+</colgroup>
+<tbody valign="top">
+<tr><td colspan="2">SPI bus, GPIO, Interrupts, Timer Capture</td>
+</tr>
+</tbody>
+</table>
+</blockquote>
+</div>
+</div>
+<div class="section" id="cc2420-packet-format-and-specifications">
+<h1><a name="cc2420-packet-format-and-specifications">3. CC2420 Packet Format and Specifications</a></h1>