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3Com Router 3000 Ethernet Family
Configuration Guide
Chapter 3 Modem Configuration
3.1 Overview of Modem
3.1.1 Modem Functions Provided by V 2.41
Modem is a network device that is widely used. It is important for a router to properly
manage and control the use of modem in a network. However, there are many modem
manufacturers and various modem models. Even though all of them support the AT
command set and are compliant with the industry standard, each type of modem differs
somewhat on the implementations and command details.
To offer the optimal flexibility, 3Com series Routers:
1)
Provide the scripts (hereinafter refer to as modem script) for modem management,
hence to enable the user to well control the modems connected to the router. A
modem script can be executed by the following two means:
Execute a modem script directly through the start-script command to initialize the
modem or other configurations.
Trigger the modem script with some special events, such as router startup, and
modem dial-in connection.
2)
Use the script along with the related commands can enhance the remote
configuration function of router. If the asynchronous serial interface works in flow
mode, the user can establish a remote connection to the interface via the dumb
terminal or modem dialup, so as to configure and administer the router.
3)
Directly send AT commands to the modem via the serial interface for managing
the modem.
4)
Intercommunicate with the equipment of other vendors. The asynchronous serial
interfaces of the participating parties are working in flow mode interconnected via
modems.
5)
Provide rich debugging information for modem maintenance and monitoring.
3.1.2 Modem Script
I. Usage of Modem script
3Com series Routers provide the modem scripts for:
Flexibly controlling the modems of different models. For example, using different
initialization AT command strings can make the modems of different
manufacturers or models to better interoperate with the 3Com series Routers.
Implementing the interactive login to remote systems. Interactive negotiation of
the scripts can enable the system enters different link states. For example, after
the asynchronous serial interfaces on the two routers set up a connection via the
3Com Corporation
3-1
Chapter 3 Modem Configuration
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