Avaya Configuring Dial Services Bedienungsanleitung PDF herunterladen (Seite 38)

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Configuring Dial Services

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Demand Lines and Pools

Demand lines provide the physical connections over which the demand circuits

transmit and receive data. To maximize the number of circuits that can be active

simultaneously, you establish a demand pool.

A demand pool is a group of one or more lines that reside in the same slot on the

router. You identify each demand pool by assigning a demand pool ID. Lines in a

demand pool can connect to a modem, directly to a PSTN (using the ARN with

the V.34 Modem Adapter Module), or directly to an ISDN network (using a router

with internal ISDN capability).

You can combine asynchronous, synchronous, and ISDN interfaces in a single

pool. The synchronous interfaces can use Raise DTR or V.25bis signaling for

modem connections. The asynchronous interfaces can use Raise DTR, V.25bis, or

Hayes signaling for modem connections. Hayes signaling requires that you use AT

modem commands to send dialing instructions to the modem. The ISDN lines use

ISDN signaling for network connections.

How Demand Lines, Pools, and Circuits Work Together

When you create demand circuits, you assign a demand pool ID to each circuit.

Note that many demand circuits can use the same demand pool and, therefore, can

use the same lines in that pool. The line itself does not have a specific network

address; it is the circuit that has the associated network address.

When the router has data to send across a demand circuit, the circuit searches for

an available demand line from its associated demand pool. When it finds an

available line, the router establishes a dial-up connection to the remote router. The

router terminates the connection when there is no more data to send or receive,

when you manually take down the connection, or when the scheduled time for an

active connection expires.

Figure 1-3

shows the relationship between demand lines, pools, and circuits using

PPP as the data link layer protocol.

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