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<td width="100%" bgcolor="#336666"><b><font face="Arial" size="2" color="#FFFFFF">Overview</font></b></td>
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<font face="Arial" size="2">Integrated Services Digital Network
(ISDN) is a network that provides end-to-end digital connectivity
to support a wide range of services including voice and data
services.</font><p><font face="Arial" size="2">ISDN allows
multiple digital channels to operate simultaneously through the
same regular phone wiring used for analog lines, but ISDN
transmits a digital signal rather than analog. Latency is much
lower on an ISDN line than on an analog line.</font></p>
<p><font face="Arial" size="2">Dial-on-demand routing (DDR) is a
technique developed by Cisco that allows the use of existing
telephone lines to form a wide-area network (WAN), instead of
using separate, dedicated lines. Public switched telephone
networks (PSTNs) are involved in this process.</font></p>
<p><font face="Arial" size="2">DDR is used when a constant
connection is not needed, thus reducing costs. DDR defines the
process of a router connecting using a dialup network when there is
traffic to send, and then disconnecting when the transfer is
complete.</font></p>
<p><font face="Arial" size="2">Students completing this module should be able to:</font></p>
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<li><font face="Arial" size="2">Define the ISDN standards used
for addressing, concepts, and signaling</font></li>
<li><font face="Arial" size="2">Describe how ISDN uses the
physical and data link layers</font></li>
<li><font face="Arial" size="2">List the interfaces and
reference points for ISDN</font></li>
<li><font face="Arial" size="2">Configure the router ISDN
interface</font></li>
<li><font face="Arial" size="2">Determine what traffic is
allowed when configuring DDR</font></li>
<li><font face="Arial" size="2">Configure static routes for DDR</font></li>
<li><font face="Arial" size="2">Choose the correct encapsulation
type for DDR</font></li>
<li><font face="Arial" size="2">Be able to determine and apply
an access list affecting DDR traffic</font></li>
<li><font face="Arial" size="2">Configure dialer interfaces</font></li>
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<p><font face="Arial" size="2"> </font>
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