Avaya Configuring Dial Services Manual do Utilizador descarregar pdf (Página 29)

Dial Services Overview

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.

Dial-on-demand is supported on synchronous lines (RS232, V.35, RS422, and

X.21) and ISDN interfaces. To implement dial-on-demand, the router establishes a

demand circuit (that is, the logical connection) over a physical line. The router

activates a demand circuit 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 a force dial. The router forces the establishment of a circuit.

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 a force take-down.

Refer to “Activating Demand Circuits” for more information.

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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Avaya Configuring Dial Services Manual do Utilizador Página 29