Introduction
This document explains how to configure Cisco routers and access servers for external modems connected to asynchronous and AUX ports. It explains how to configure the modem to operate properly when connected. This document addresses connection to a console port, but only with reference to concepts, not actual installation practices.
Note: This document is not a reference for the Microcom or MICA modems used internally on the AS5200, AS5300, AS5800, Cisco 2600, or Cisco 3600 routers. This document is also not a reference for synchronous modems, though there can be a number of similarities. This document is a reference for asynchronous modems only. While much of the information here can apply to synchronous modems, do not rely on it when you configure them.
Prerequisites
Requirements
There are no specific prerequisites for this document.
Components Used
The information in this document is based on the software and hardware versions below.
Cisco IOS® Software Releases 9.21 and later
A modem that is V.34-capable (or better)
Note: This document does not address platforms that have reached End of Life status, such as ASMs, MSMs, CSMs, STS-10s or 500-CSs.
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 work in a live network, ensure that you understand the potential impact of any command before you use it.
Conventions
Refer to the Cisco Technical Tips Conventions for more information on document conventions.
Hardware Configuration
The first step to attach a modem to a router is to install the hardware. The main concerns are which cables to use and why or why not to use the console port for a modem cisco service provider.
Cabling Issues
It is important to connect the modem to the router before you configure the modem in order to verify communication between them. If the cabling is incorrect, the rest of the process fails.
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