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<td bgcolor="#336666"><b><font face="Arial" size="2" color="#FFFFFF">4</font></b><font face="Arial" size="2" color="#FFFFFF"><b>.1</b></font></td>
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<td bgcolor="#336666" width="100%"><strong>
<font face="Arial" size="2" color="#FFFFFF">ISDN Concepts</font></strong></td>
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<td bgcolor="#669999" height="25"><b>
<font face="Arial" size="2" color="#FFFFFF">4.1.7</font></b></td>
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<font face="Arial" size="2" color="#FFFFFF">ISDN switch types</font></strong></td>
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<font face="Arial" size="2">Routers must be configured to identify the
type of switch with which they will communicate. Available ISDN switch
types vary, depending in part on the country in which the switch is
being used. As a consequence of various implementations of Q.931, the D
channel signaling protocol used on ISDN switches varies from vendor to
vendor.</font><p>
<font face="Arial" size="2">Services offered by ISDN carriers vary
considerably from country to country or region to region.
<img border="0" src="../../images/1.gif" align="absmiddle" width="12" height="12"> Like modems,
each switch type operates slightly differently, and has a specific set
of call setup requirements. Before the router can be connected to an
ISDN service, it must be configured for the switch type used at the CO.
This information must be specified during router configuration so the
router can communicate with the switch, place ISDN network level calls,
and send data.
<img border="0" src="../../images/2.gif" align="absmiddle" width="12" height="12"></font></p>
<p>
<font face="Arial" size="2">In addition to knowing the switch type the
service provider is using, it may also be necessary to know what service
profile identifiers (SPIDs) are assigned by the telco. A SPID is a
number provided by the ISDN carrier to identify the line configuration
of the BRI service. SPIDs allow multiple ISDN devices, such as voice and
data equipment, to share the local loop. SPIDs are required by DMS-100
and National ISDN-1 switches.</font></p>
<p>
<font face="Arial" size="2">SPIDs are used only in North America and
Japan. The ISDN carrier provides a SPID to identify the line
configuration of the ISDN service. In many cases when configuring a
router, the SPIDs will need to be entered.</font></p>
<p>
<font face="Arial" size="2">Each SPID points to line setup and
configuration information. SPIDs are a series of characters that usually
resemble telephone numbers. SPIDs identify each B channel to the switch
at the central office. Once identified, the switch links the available
services to the connection. Remember, ISDN is typically used for dialup
connectivity. The SPIDs are processed when the router initially connects
to the ISDN switch. If SPIDs are necessary, but are not configured
correctly, the initialization will fail, and the ISDN services cannot be
used.</font></p>
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<b>Web Links</b></font></p>
</font><font FACE="Arial" SIZE="2" COLOR="#808080">
<p>ISDN Switch Types, Codes, and Values<p>
<a target="_blank" href="http://www.cisco.com/en/US/products/sw/iosswrel/ps1831/products_command_reference_chapter09186a00800eea24.html">
http://www.cisco.com/en/US/products/sw/
iosswrel/ps1831/ products_command_reference_ chapter09186a00800eea24.html</a></font></p>
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