>5 </p>
      </td>
      <td width="6%">
      <p align="center"><img src="graphics/right.gif" alt="===&gt;"
 align="bottom" border="0" height="13" width="22"> </p>
      </td>
      <td width="80%">DATA - section 1 (system data)</td>
    </tr>
    <tr>
      <td width="7%">
      <p align="center">6 </p>
      </td>
      <td width="6%">
      <p align="center"><img src="graphics/left.gif" alt="&lt;==="
 align="bottom" border="0" height="13" width="22"> </p>
      </td>
      <td width="80%">ACK</td>
    