Avaya Configuring Dial Services Bedienungsanleitung PDF herunterladen (Seite 120)

Configuring Dial Services

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117353-B Rev. 00

Router A calls Router B. When Router A makes the call, it places its local CHAP

name, Branch_A, and CHAP secret in the CHAP challenge message. Router B’s

caller resolution table shows Branch_A assigned to Circuit 5, the connection to

Router A. When Router B receives the call, it looks in its table, confirms

Router A’s CHAP name (referred to as the Caller Name in the table) and CHAP

secret, and activates Circuit 5.

Conversely, when Router B calls Router A, it places its local CHAP name,

Branch_B, in the CHAP challenge message. Router A looks in its table, verifies

that Router B is an authorized caller, and brings up Circuit 27, the connection to

Router B.

PAP is similar to CHAP, but PAP uses a PAP ID and password as part of the

identification process. The calling router places its PAP ID and password in the

authenticate request to the called router. The called router first looks in the caller

resolution table to find the PAP ID (referred to as the Caller Name in the table). If

the router finds the PAP ID, it then checks the table for the password associated

with the ID and compares it to the password in the authenticate request. If the

passwords match, the router brings up the circuit.

To configure the caller resolution table, see Chapter 14, “Customizing Caller

Resolution.” For more information about CHAP names and PAP IDs, see

Configuring PPP Services.

Asynchronous PPP

Asynchronous PPP provides communication for asynchronous interfaces on the

, ASN, and ANH (using the Dual Sync Net Module); ARN (using any Serial

Expansion Module); and BLN and BCN

(using the Octal Sync Net Module).

There are several advantages to asynchronous communications:

• Low cost -- Analog lines are less expensive than high-speed digital lines.

Asynchronous modems are less expensive than synchronous modems. You

can also dial directly into the router without using a terminal server or other

port-concentration devices.

• Effective use of router hardware -- You can use an available serial port on

the router for a dial-up application.

• Line availability -- Analog lines are available in most locations, enabling you

to dial in from any remote location.

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Avaya Configuring Dial Services Bedienungsanleitung Seite 120