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<td bgcolor="#336666"><b><font face="Arial" size="2" color="#FFFFFF">4.2</font></b></td>
<td bgcolor="#336666"><img border="0" src="../../images/transdot.gif" width="10" height="1"></td>
<td bgcolor="#336666" width="100%"><strong>
<font face="Arial" size="2" color="#FFFFFF">ISDN Configuration</font></strong></td>
<td width="9" bgcolor="#336666"> </td>
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<tr>
<td bgcolor="#669999" height="25" width="18"> </td>
<td bgcolor="#669999" height="25"><b>
<font face="Arial" size="2" color="#FFFFFF">4.2.2</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">Configuring ISDN PRI</font></strong></td>
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<p>
<font face="Arial" size="2">ISDN PRI is delivered over a leased T1 or
E1 line. The main PRI configuration tasks are as follows:
<img border="0" src="../../images/1.gif" align="absmiddle" width="12" height="12"></p>
<ol>
<li>Specify the correct PRI switch
type that the router interfaces with at the CO of
the ISDN provider. </li>
<li>Specify the T1/E1 controller, framing type, and line coding for
the facility of the ISDN provider. </li>
<li>Set a PRI group timeslot for the T1/E1 facility and indicate the
speed used. </font></li>
</ol>
<p><font face="Arial" size="2">Because routers connect to PRI using
T1/E1, there is no "interface pri� command. Instead, the physical
interface on the router that connects to the leased line is called a
T1 controller, or an E1 controller, if an E1 line is being used. This
controller must be configured properly in order to communicate with the
carrier network. The ISDN PRI D and PRI B channels are configured
separately from the controller, using the
</font><font face="Courier New" size="2"><b>interface serial</b></font><font face="Arial" size="2"> command.
</font></p>
<p><font face="Arial" size="2">Use the </font>
<font face="Courier New" size="2"><b>isdn switch-type</b></font><font face="Arial" size="2"> command to
specify the ISDN switch used by the provider to which the PRI
connects. As with BRI, this command can be issued globally or in
interface configuration mode. The table shows the switch types
available for ISDN PRI configuration:
<img border="0" src="../../images/2.gif" align="absmiddle" width="12" height="12"></font></p>
<blockquote>
<p><font face="Courier New" size="2">Router(config)#<b>isdn
switch-type
primary-net5 </b> </font></p>
</blockquote>
<p><font face="Arial" size="2">Configuring a T1 or E1 controller is
done in four parts:
<img border="0" src="../../images/3.gif" align="absmiddle" width="12" height="12"></p>
<ol>
<li>From global configuration mode,
specify the controller and the slot/port in the router where the PRI
card is located:
</font><font face="Courier New" size="2">
<p>Router(config)#<b>controller</b>
{<b>t1</b> |
<b>e1</b>} {<i>slot</i>/<i>port</i>} <br>
Router(config-controller)# </li>
<br>
</li></font><font face="Arial" size="2"><li>Configure the framing, line coding, and clocking, as dictated by
the service provider. The </font><font face="Courier New" size="2">
<b>framing</b></font><font face="Arial" size="2">
command is used to select the frame
type used by the PRI service provider. For T1, use the following
command syntax:
</font><font face="Courier New" size="2">
<p>Router(config-controller)#<b>framing</b> {<b>sf</b> | <b>esf</b>}</p>
</font><font face="Arial" size="2">
For E1 lines, use the </font><font face="Courier New" size="2">
<b>framing</b></font><font face="Arial" size="2">
command with the following options:
</font><font face="Courier New" size="2">
<p>Router(config-controller)#<b>framing</b> {<b>crc4</b> | <b>no-crc4</b>}
[<b>australia</b>] </p>
</font><font face="Arial" size="2">
Use the </font><font face="Courier New" size="2">
<b>linecode</b></font><font face="Arial" size="2">
command to identify the physical-layer signaling
method on the digital facility of the provider:
</font><font face="Courier New" size="2">
<p>Router(config-controller)#<b>linecode</b> {<b>ami</b> | <b>b8zs</b>|
<b>hdb3</b>} </p>
</font><font face="Arial" size="2">
<p>In North America, the B8ZS signaling method is used for T1 carrier
facilities. It allows a full 64 kbps for each ISDN channel. In Europe,
it is typically HDB3 encoding that is used.</p>
</li>
<li>Configure the specified interface for PRI operation and the number
of fixed timeslots that are allocated on the digital facility of the
provider:
</font><font face="Courier New" size="2">
<p>Router(config-controller)#<b>pri-group</b> [<b>timeslots</b>
<i>range</i>] </font></p>
<font face="Arial" size="2">
<p>For T1, the range of timeslots used is 1-24. For E1 the range of
timeslots used is 1-31.</p>
</li>
<li>Specify an interface for PRI D-channel operation. The interface
is a serial interface to a T1/E1 on the router: </font>
<p><font size="2" face="Courier New">Router(config)#<b>interface serial</b>{<i>slot/port:</i> | <i>unit:</i>}{<b>23</b> | <b>15</b>} </font>
</font></li>
</ol>
<p><font face="Arial" size="2">Within an E1 or T1 facility, the
channels start numbering at 1. The numbering ranges from 1 to 31 for
E1 and 1 to 24 for T1. Serial interfaces in the Cisco router start
numbering at 0. Therefore, channel 16, the E1 signaling channel, is
channel 15 on the interface. Channel 24, the T1 signaling channel,
becomes channel 23 on the interface. Thus, interface serial 0/0:23
refers to the D channel of a T1 PRI. </font></p>
<p><font face="Arial" size="2">Subinterfaces, commonly used with Frame
Relay, are designated with a dot, or period. For example, Serial
0/0.16 is a subinterface. Do not confuse the channels of a T1 or E1
with subinterfaces. Channels use a colon instead of a dot to indicate
the channel number: </font></p>
<ul>
<li><font face="Arial" size="2">S0/0.23 refers to a Subinterface</font></li>
<li><font face="Arial" size="2">S0/0:23 refers to a channel </font>
</li>
</ul>
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<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>
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<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">
<a href="javascript:void(0)" onClick="window.open('../../elabs/mod04/elab_4_2_2/elab4_2_2.html','Interactivity','width=740,height=390,toolbar=0,resizable=yes,scrollbars=0,screenX=26,screenY=38,left=26,top=38');">
<img border="0" src="../../images/lab_icon.gif" width="25" height="25"><b></a>
<a href="javascript:void(0)" onClick="window.open('../../elabs/mod04/elab_4_2_2/elab4_2_2.html','Interactivity','width=740,height=390,toolbar=0,resizable=yes,scrollbars=0,screenX=26,screenY=38,left=26,top=38');">Lab Activity</a></b></font></p>
</font><font FACE="Arial" SIZE="2" COLOR="#808080">
<p>e-Lab Activity:
</font><font FACE="Courier New" SIZE="2" COLOR="#808080">
<b>isdn switch-type</b></p>
</font><font FACE="Arial" SIZE="2" COLOR="#808080">
<p>In this activity, the student will demonstrate how to use the
</font><font FACE="Courier New" SIZE="2" COLOR="#808080">
<b>isdn switch-type</b></font><font FACE="Arial" SIZE="2" COLOR="#808080">
command.</p>
<font FACE="Arial" SIZE="2" COLOR="#000000">
<p></TD>
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<TD width="5">
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<TD><IMG alt="" height="1" width="3" src="../../images/s.gif"></TD><TD align="right" valign="top">
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<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>Configuring ISDN PRI<p>
<a target="_blank" href="http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_configuration_guide_chapter09186a00800ca71d.html">
http://www.cisco.com/en/US/products/sw/
iosswrel/ps1835/products_configuration_
guide_chapter09186a00800ca71d.html</a></font></p>
<p>
<IMG alt="" height="2" width="1" src="../../images/s.gif"></p>
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<font face="Arial" size="2"> </font>
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</blockquote>
</blockquote>
</blockquote>
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