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+
+<head>
+<meta http-equiv="Content-Language" content="en-us">
+<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
+<title>Content</title>
+<base target="_self">
+</head>
+
+<body background="../../images/bg.gif" topmargin="0" leftmargin="0" marginheight="0" marginwidth="0" onLoad="window.focus();" link="#808080" vlink="#808080" alink="#808080">
+
+<table border="0" cellpadding="0" cellspacing="0" width="100%">
+ <tr>
+ <td bgcolor="#336666" width="18" valign="top">
+ <img border="0" src="../../images/content_lines.gif" width="16" height="25">
+ <img border="0" src="../../images/transdot.gif" width="2" height="1"></td>
+ <td bgcolor="#336666"><font face="Arial" size="2" color="#FFFFFF"><b>5.1</b></font></td>
+ <td bgcolor="#336666"><img border="0" src="../../images/transdot.gif" width="10" height="1"></td>
+ <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>
+ </span></b></td>
+ <td width="9" bgcolor="#336666"> </td>
+ </tr>
+ <tr>
+ <td bgcolor="#669999" height="25" width="18"> </td>
+ <td bgcolor="#669999" height="25"><b><font face="Arial" size="2" color="#FFFFFF">
+ 5.1.1</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">Introducing Frame Relay</font></strong></td>
+ <td bgcolor="#669999" height="25" width="9"> </td>
+ </tr></table>
+
+<table border="0" cellpadding="0" cellspacing="0" width="95%" bordercolor="#111111">
+ <tr>
+ <td width="15"></td>
+ <td>
+
+ <p><font face="Arial" size="2">Frame Relay is an International
+ Telecommunication Union Telecommunications Standardization Sector (ITU-T)
+ and American National Standards Institute (ANSI) standard. Frame Relay
+ is a packet-switched, connection-oriented, WAN service. It operates at
+ the data link layer of the OSI reference model.
+ Frame Relay uses a subset of the high-level data link
+ control (HDLC) protocol called Link Access Procedure for Frame Relay (LAPF). Frames
+ carry data between user devices called data terminal equipment
+ (DTE), and the data communications equipment (DCE) at the edge of the
+ WAN. <img border="0" src="../../images/1.gif" align="absmiddle" width="12" height="12"></font><p><font face="Arial" size="2">
+ Originally Frame Relay was designed to allow ISDN equipment to have access to a packet-switched
+ service on a B channel. However, Frame Relay is now a stand-alone
+ technology.</font><p><font face="Arial" size="2">A Frame Relay network
+ may be privately owned, but it is more commonly provided as a service by
+ a public carrier. It typically consists of many
+ geographically scattered Frame Relay switches interconnected by trunk
+ lines. <img border="0" src="../../images/2.gif" align="absmiddle" width="12" height="12">
+ <img border="0" src="../../images/3.gif" align="absmiddle" width="12" height="12"></font><p><font face="Arial" size="2">
+ Frame Relay is often used to interconnect LANs. When
+ this is the case, a router on each LAN will be the DTE. A serial
+ connection, such as a T1/E1 leased line, will connect the router to a Frame
+ Relay switch of the carrier at the nearest point-of-presence for the
+ carrier. The Frame
+ Relay switch is a DCE device. Frames from one DTE will be moved across the network
+ and delivered to other DTEs by way of DCEs.
+ <img border="0" src="../../images/4.gif" align="absmiddle" width="12" height="12"></font><p>
+ <font face="Arial" size="2">Computing equipment that is not on a LAN may
+ also send data across a Frame Relay network. The computing equipment will use a Frame Relay access
+ device (FRAD) as the DTE. </font></p>
+
+ <p>
+ <TABLE bgcolor="#B0AFAF" width="95%" border="0" cellspacing="0" cellpadding="0">
+ <TR>
+ <TD valign="top">
+ <TABLE bgcolor="#669999" width="100%" cellspacing="0" cellpadding="0" border="0">
+ <TR>
+ <TD width="5">
+ <img border="0" src="../../images/lab_toplft.gif" width="116" height="23"></TD>
+ <TD><IMG alt="" height="1" width="3" src="../../images/s.gif"></TD><TD align="right" valign="top">
+ <IMG alt="" src="../../images/corner_ur_7.gif" width="7" height="7"></TD>
+ </TR>
+ </TABLE>
+
+ <TABLE bgcolor="#B0AFAF" width="100%" cellspacing="0" cellpadding="0" border="0">
+ <TR>
+ <TD>
+ <TABLE width="100%" cellpadding="2" cellspacing="0" border="0" bordercolor="#111111">
+ <TR>
+ <TD bgcolor="#ffffff" width="15"> </TD>
+ <TD bgcolor="#ffffff"><font FACE="Arial" SIZE="2" COLOR="#000000">
+ <p><font color="#808080">
+ <img border="0" src="../../images/links_icon.gif" width="25" height="25">
+ <b>Web Links</b></font></p>
+ </font><font FACE="Arial" SIZE="2" COLOR="#808080">
+
+ <p>Frame Relay<p>
+ <a target="_blank" href="http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/frame.htm">
+ http://www.cisco.com/univercd/cc/
+ td/doc/ cisintwk/ito_doc/ frame.htm</a></font></p>
+
+ <p>
+ <IMG alt="" height="2" width="1" src="../../images/s.gif"></p>
+ </TD>
+ </TR>
+ </TABLE>
+ </TD>
+ </TR>
+ </TABLE>
+ </TD>
+ </TR>
+ </TABLE><p>
+
+ <font face="Arial" size="2"> </font>
+
+ </td>
+ </tr>
+ </table>
+
+</body>
+
+</html>
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