Black Box Modem MD885A-R3 Bedienungsanleitung PDF herunterladen (Seite 63)

Modem 34336

4.7 Modem Security Operation

In 2-Wire-Dial Hayes emulation mode only, the Modem can be configured to

provide security on incoming calls. Remote users attempting to connect to the

Modem are required to enter a password. Incoming calls are accepted only if

the user enters a valid password.

NOTE

The security features described in this manual provide a deterrent to

unauthorized access. No communications system can be made perfectly

secure.

ASSWORD

ROTECTION

NOTE

Password protection functions only if the Modem is in Hayes emulation

mode, error correction and/or buffer mode are enabled, and the data

format is asynchronous.

In Hayes mode only, the Modem can be configured for two types of security

operation: security callback or password pass-through operation. Both types of

security operation provide security on incoming calls by requiring remote

users to enter a valid password. In addition, access to Hayes compatible

commands for viewing and storing phone numbers is password-protected.

If callback operation is enabled, the Modem calls back an authorized user

after he or she enters a valid password. If pass-through operation is enabled,

the Modem passes a connection on to the DTE interface only after it receives

a valid password.

The password-protection scheme used by the Modem for incoming calls is

summarized below.

• A remote modem calls the local Modem.

• Local Modem answers.

• Remote user sends carriage return [CR].

• Local Modem sends PASSWORD? query, displayed on remote terminal.

• Remote user sends unique password (assigned to remote modem).

• Local Modem confirms password and, according to the password, grants

access (if programmed for pass-through operation) or initiates security

callback.

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Black Box Modem MD885A-R3 Bedienungsanleitung Seite 63