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<td bgcolor="#336666"><b><font face="Arial" size="2" color="#FFFFFF">5</font></b><font face="Arial" size="2" color="#FFFFFF"><b>.1</b></font></td>
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<td bgcolor="#336666" width="100%"><b style="mso-bidi-font-weight:normal"><span style="font-family:Arial;mso-bidi-font-family:"Times New Roman""><o:p>
<font size="2" color="#FFFFFF">Frame Relay Concepts</font>
</o:p>
<o:p>
</o:p></span></b></td>
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<td bgcolor="#669999" height="25" width="18"> </td>
<td bgcolor="#669999" height="25"><b>
<font face="Arial" size="2" color="#FFFFFF">5.1.3</font></b></td>
<td bgcolor="#669999"><img border="0" src="../../images/transdot.gif" width="10" height="1"></td>
<td bgcolor="#669999" height="25" width="100%"><strong>
<font face="Arial" size="2" color="#FFFFFF">Frame Relay stack layered
support</font></strong></td>
<td bgcolor="#669999" height="25" width="9"> </td>
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<td>
<font FACE="Arial" SIZE="2">
Frame Relay functions by doing the following:</font><ul>
<li>
<font FACE="Arial" SIZE="2">
Takes data packets from a network layer protocol, such as IP or IPX</font></li>
<li>
<font FACE="Arial" SIZE="2">
Encapsulates them as the data portion of a Frame Relay frame
<img border="0" src="../../images/1.gif" align="absmiddle" width="12" height="12">
<img border="0" src="../../images/2.gif" align="absmiddle" width="12" height="12"></font></li>
<li>
<font FACE="Arial" SIZE="2">
Passes them to the physical layer for delivery on the wire</font></li>
</ul>
<p>
<font FACE="Arial" SIZE="2">
The physical layer is typically EIA/TIA-232, 449 or 530, V.35, or
X.21.
The Frame Relay frame is a sub-set of the HDLC frame type. Therefore it is
delimited with flag fields. The 1-byte flag uses the bit
pattern 01111110. If the Frame CheckSum (FCS) does
not match the address and data fields at the receiving end, the frame
is discarded without notification.</font></p>
<p><font face="Arial" size="2"> </font>
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