
Dial Services Overview
114062 Rev. A 1-3
Dial-on-Demand Service
Dial-on-demand enables you to establish a network connection only when the
router has data to send across the network, or when you dynamically configure the
router to establish a connection. By using the dial-up lines, you significantly
reduce the high costs associated with using leased lines, which connect remote
locations even if there is no data to transmit or receive.
To implement dial-on-demand, the router establishes a demand circuit (that is, the
logical connection) over a physical line. The router establishes a demand
connection for any one of the following reasons:
• The router has data to send across the circuit.
• You specify a time of day to activate the circuit.
• You enable the Force Dial parameter, which instructs the router to force a
connection.
The router brings down the circuit when
• The configured inactivity time expires.
• You schedule a time of day to take the circuit down.
• You enable the Force Take Down parameter, which instructs the router to
force the termination of a connection.
Refer to “
Activating Demand Circuits” for more information.
Dial-on-demand is supported on asynchronous (RS449), synchronous (RS449,
V.35, RS422, and X.21) and ISDN interfaces.
Figure 1-2 shows a demand line
connecting two routers. When the router has data to transmit or when you
configure the router to bring up a demand circuit, the router instructs the dial
device to establish a connection.
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