Specifications

3-51
Software Configuration Guide for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Routers
OL-1957-03
Chapter 3 Configuring with the Command-Line Interface
Configuring the Digital Modem Network Module for the Cisco 3640 Router
Prerequisites
Before you can configure a modem interface, complete the following prerequisite tasks:
• Install a PRI network module and another module (such as Ethernet) to provide connectivity to the
LAN. Digital modem network modules do not provide physical network interfaces of their own, but
instead handle analog calls passing through the PRI network module. The PRI module is capable of
concurrently handling digital ISDN data and remote voice-channel (analog) modem connections.
The digital modem module provides a pool of available modems that can be used for both incoming
and outgoing calls.
For information on how to correctly install a PRI network module, refer to the 1-Port and 2-Port
ISDN-PRI Network Module Configuration Note. For information on how to install an Ethernet
module, refer to the 1-Port Ethernet Network Module Configuration Note or the 4-Port Ethernet
Network Module Configuration Note. For other modules, refer to the specific configuration notes
pertaining to them.
Note • The PRI module must be hardware revision -03; earlier revisions are incompatible with digital
modem modules. For more information, refer to the “Software and Hardware Requirements”
section in the Digital Modem Network Module Configuration Notes.
• Install the Digital Modem Network Module in a chassis slot. For information on how to correctly
install this network module, refer to the “Installing a Digital Modem Network Module in a Chassis
Slot” section in the Digital Modem Network Module Configuration Note.
• Complete basic device configuration, including host name, username, protocol, and security
configuration.
• Make sure that you have the following information:
– ISDN PRI Switch type
– T1 (or E1) information, such as line code and framing type
– Channel-group information and time-slot mapping
Configuration Tasks
Complete the following tasks to configure the digital modem module interfaces:
• Configure the E1/T1 Network Module for ISDN PRI, page 3-52
• Configure the ISDN D-Channel Serial Interfaces, page 3-53
• Configure the Loopback Interface, page 3-55
• Configure the LAN Interface, page 3-55
• Create the Group Asynchronous Interface, page 3-55
• Configure the ISDN Dialer Interface, page 3-56
• Configure the Default IP Pool Information, page 3-57
• Configure Modem Lines for Dial-In and Dial-Out, page 3-57
These tasks are described in the following sections.