Cisco Cisco 2600 3600 Series 8-Port Analog Modem Network Module 技术手册

Introduction
 Prerequisites
      Requirements
      Components Used
      Conventions
 Configure
      Network Diagram
      Configurations
 Verify
 Troubleshoot
      Troubleshooting Commands
      Sample Debug Output
 Related Information

This document provides a sample configuration for dialin using a modem with the NM−xAM analog modem
network module. In this scenario, a router with the NM−8AM modem module acts as a remote access server
for dialin into the corporate network. 

Note: This document does not cover using an NM−8AM or NM−16AM for dialout. For such an example,
refer to the document Configuring Dialout with the NM−8AM or NM−16AM Analog Modem Module.

This document assumes you have a good understanding of the various issues associated with modem
configurations. If you need more information on these issues, please refer to the Modem−Router Connection
Guide.

The NM−AM module requires individual analog plain old telephone service (POTS) lines to be plugged into
the ports. Please ensure that the POTS line is functioning properly by connecting a phone to the line and
testing it for incoming and outgoing calls before plugging it into the NM−AM ports.

Individual ports can have individual phone numbers (in this example we are using eight different
phone numbers), or can have all eight in a hunt group with a single dialin number (the phone provider
needs to do this). With the first option, users get a busy signal if a prior call is still connected on that
particular number. With the second option, calls are automatically rolled over to the next available
port.

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Be absolutely sure to use a properly−grounded power source for Cisco 2600 and 3600 routers with
NM−AM modules; otherwise, the NM−AM modem calls have a buzzing sound that manifests itself as
poor or failed connections. Refer to the document Installing the Grounding Lug on Cisco 2600 Series
and Cisco 3600 Series Routers for more information.

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