Cisco Cisco Catalyst 6000 Multilayer Switch Feature Card MSFC2 Installation Guide

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Connecting Cisco Digital Modem Network 
Modules to the Network
Revised: May 1, 2008, OL-12813-01
This guide describes how to connect Cisco digital modem network modules to your network. It contains 
the following sections:
Digital Modem Network Modules Overview
These modules (see 
) contain 6, 12, 18, 24, or 30 V.34+ digital modems for a direct digital 
connection to an Integrated Services Digital Network (ISDN) Primary Rate Interface (PRI) or Basic Rate 
Interface (BRI) channel, allowing you to mix digital and analog calls to provide remote access to a LAN. 
Figure 1
Digital Modem Network Module
Digital modem network modules do not provide network interfaces of their own, but instead handle 
analog calls passing through other router interfaces. In addition to the digital modem module, the router 
must contain a PRI or BRI interface to connect to the ISDN channel, and another interface, such as 
Ethernet, to provide connectivity to the LAN. The PRI or BRI module concurrently handles digital ISDN 
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