Avaya Configuring Dial Services Manual do Utilizador descarregar pdf (Página 36)

100

101

Configuring Dial Services

1-8

117353-B Rev. 00

In Figure 1-3, three circuits share two physical lines that make up Demand pool 1.

Note that only two of the circuits using Demand pool 1 can be active

simultaneously because only two modems are available. The IP addresses are

associated with each circuit, not with the physical line.

In addition to assigning a demand pool ID to each circuit, you can assign protocol

interfaces and configure phone lists for use with V.25bis, Hayes, and ISDN

signaling. For more information, see “Customizing Phone Lists” on page 13-1.

Demand Circuit Protocols

The protocol for a demand circuit can be either PPP or frame relay. A frame relay

demand circuit can have any number of service records and PVCs. Typically,

frame relay connections are used with ISDN lines. PPP and frame relay circuits

can use the same demand pool.

Figure 1-3

on page 1-7 shows an example of a PPP demand circuit over modem

lines; Figure 1-4

shows a frame relay demand circuit over ISDN lines.

Figure 1-4. Dial-on-Demand Connection over a Frame Relay Network

Router A

Router B

Router C

DS0033A

Router D

Frame Relay network

Frame

Relay

switch

Frame

Relay

switch

Frame

Relay

switch

Frame

Relay

switch

T1/HSSI/SYNC

BRI

PRI

Raise DTR/V.25bis

MODEM

Key

Leased line

Dial-up line

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