Printable Pdf

Document ID: 10307.

Introduction

This configuration supports remote users (for example, a home user or a traveling employee) connecting to the network with an analog dial-up modem using V.90 protocol. Using a PC and an analog modem, the user connects through dial-up PPP to a Basic Rate Interface (BRI) on a Cisco 3640 router. A BRI provides a high speed modem connection and costs less than a Primary Rate Interface (PRI).

Note: Only two async users can dial into each BRI at a time due to the channel limitations on a BRI.

Before You Begin

Conventions

For more information on document conventions, see the Cisco Technical Tips Conventions.

Prerequisites

There are no specific prerequisites for this document.

Components Used

This configuration was developed and tested using the software and hardware versions below.

• Cisco 3640
• Cisco BRI network module (use one of the following)

• Digital modem network module (use one of the following: NM-6DM, NM-12DM, NM-18DM, NM-24DM, or NM-30DM)
• LAN interface card
·
• Cisco IOS® Software Release 12.0(2)XC

For more information regarding minimum hardware and software requirements (for example, part numbers and revision numbers), see the Modem over ISDN BRI for the Cisco 3640 Router documentation.

The information presented in this document was created from devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If you are working in a live network, ensure that you understand the potential impact of any command before using it.¨

Background Theory

This configuration uses a local user list for access security on the Cisco router.

Below are the relevant sections of the show version command output with the Cisco IOS Software version and the modem firmware versions used to implement this configuration:

Use the show diag EXEC command to determine the type of hardware installed in your router. The show diag command displays the version number as well as the part number of the hardware modules in the router.

Following is the relevant section of the sample output from the show diag EXEC command:

  maui-nas-04#show diag
  Slot 1:
  BRI (U) port adapter, 4 ports
  Serial number 17156199 Part number 800-01238-06

Configure

In this section, you are presented with the information to configure the features described in this document.

Note: To find additional information on the commands used in this document, use the IOS Command Lookup tool

Network Diagram

This document uses the network setup shown in the diagram below.

Configurations

This document uses the configurations shown below.

Verify

This section provides information you can use to confirm your configuration is working properly.

Certain show commands are supported by the Output Interpreter tool, which allows you to view an analysis of show command output.

• show isdn stat - The status should be:
  layer 1 = active
  layer 2 = MULTIPLE_FRAMES_ESTABLISHED

If Layer 1 is not active, the wiring adapter or port may be damaged or not plugged in. If Layer 2 is in a state of TEI_Assign, the router is not talking to the switch.


• show line - To display the parameters of the lines. Use the show line command to decide which lines need to be configured for dial in.
• show users - To display the line number, connection name, idle time, and terminal location. ·
• show diag - To determine the type of hardware installed in your router.

Troubleshoot

This section provides information you can use to troubleshoot your configuration.

Troubleshooting Commands

Note: Before issuing debug commands, please see Important Information on Debug Commands.

• debug modem - To observe modem line activity on an access server.
• debug modem csm - To debug the call state machine used to connect calls on the modem.
• debug isdn Q931 - To check ISDN connections as users dial in to see what is happening with the ISDN call (for example, if the connection is being dropped).

Related Information

• Modem over ISDN BRI for the Cisco 3640 Router
• Configuring Modem Support and Other Asynchronous Features
• Technical Support - Cisco Systems

All contents are Copyright © 1992-2004 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement.