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Some configuration is required on a router so it can place and receive asynchronous calls. There is often confusion between the
interface async and
line commands. The major difference is that the
interface async command lets you configure the protocol (logical) aspects of an asynchronous port, as shown in the Figure.
The line
command lets you configure the physical aspects of the same port,
such as the modem attached to it as shown in the Figure.
The async commands can be thought of as internal configuration; the
line commands configure external characteristics of the configuration. For example, you configure the basic modem-related parameters on an access server using the
line command, but you configure the protocol encapsulation and authentication schemes with the
interface async command.
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