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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.
P
ASSWORD
P
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.