>
      <td bgcolor="#ccffcc" width="50%"><i>Variable header: Backup</i></td>
    </tr>
    <tr>
      <td bgcolor="#ffcccc">TI:</td>
      <td bgcolor="#ffcccc" width="50%"><b><tt>85&nbsp;56&nbsp;09&nbsp;00</tt></b></td>
      <td bgcolor="#ffcccc" width="50%"><i>Acknowledgement of header</i></td>
    </tr>
    <tr>
      <td bgcolor="#ffcccc">&nbsp;</td>
      <td bgcolor="#ffcccc" width="50%"><b><tt>85&nbsp;09&nbsp;09&nbsp;00</tt></b></td>
      <td bgcolor="#ffcccc" width="50%"><i>Clear to send backup</