dial-up connection

dial-up connection: The connection to your network if you use a device that uses the telephone network. This includes modems with a standard telephone line, ISDN cards with high-speed ISDN lines, or X.25 networks.

If you are a typical user, you might have one or two dial-up connections, for example, to the Internet and to your corporate network. In a more complex server situation, multiple network modem connections might be used to implement advanced routing.