Security Function - ZyXEL Communications Omni 56K User Manual

User's Guide for ZyXEL Omni 56K USB Modem

3.3.2 Security Function

The Omni modem provides a security function, that (when enabled) prevents an unauthorized
user from making a connection. Two types of security function are provided. Type 1 security is
used when the remote modem is also a ZyXEL modem; type 2 security is used when the
remote modem is any other brand of modem.
With the type 1 connection, the dial-in (remote) modem sends in its supervisor password for
checking at the initial connection handshake, and the local modem checks this password
against its pre-stored acceptable password list. With a type 2 connection, the remote terminal is
prompted to enter the password at the initial connection and the local modem does the
password checking.
Two levels of security are provided. With level 1 security, the local modem maintains the
connection if the password check is OK, otherwise the line is disconnected. With level 2
security, the local modem disconnects the line if the password has been found in its pre-stored
acceptable list and then dials back the phone number corresponding to the dial-in password.
The line is simply disconnected if the password does not match.
Four user passwords may be defined. The corresponding four dial-back numbers are the
modem's four stored phone numbers. Any character (ASCII 0 to 127) can be used in the
password. The maximum password length is 8 characters.
The security functions are only accessible through AT commands in terminal mode. Any
access attempt results in the modem's prompting to enter the supervisor password. The attempt
is rejected if the entered password is not correct. The default supervisor password is ZyXEL
when the modem is shipped from the factory. This supervisor password is also the password
sent for automatic password checking in a type 1 connection. To modify the supervisor
password, use
AT*HS
3-11