Omni 56K Plus Series User’s Guide

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 will send in its supervisor password for checking at the initial connection handshake, and the local modem will check this password against its pre-stored acceptable password list. With a type 2 connection, the remote terminal will be prompted to enter the password at the initial connection and the local modem will do the password checking.

Two levels of security are provided. With level 1 security, the local modem will maintain the connection if the password check is OK, otherwise the line will be disconnected. With level 2 security, the local modem will disconnect the line if the password has been found in its pre-stored acceptable list and then will dial back the phone number corresponding to the dial-in password. The line will be simply disconnected if the password does not march.

4 user passwords may be defined. The corresponding.4 dial-back numbers are the modem’s 4 stored phone numbers. Any character (ASCII 0-127) 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 will result in the modem’s prompting to enter the supervisor password. The attempt will be 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

You will be asked for the original password and a new password and then to re-enter the new password for verification. For example:

PASSWORD (Enter supervisor password)

********

PASSWORD (Enter new supervisor password)

********

Verify (Enter the new supervisor password again)

********

OK

The command AT*Hn will modify the nth user password and the supervisor password on the screen for viewing. Again, you will be prompted to enter the supervisor password first.

The commands below will enable different types and levels of security:

CODE

DESCRIPTION

 

 

*G0

Disable security function (Default).

 

 

*G1

Enable type 1 security with password check. (ZyXEL to ZyXEL only)

 

 

*G2

Enable type 1 security with password check and call-back (ZyXEL to ZyXEL only)

 

 

*G3

Enable type 2 security with password check.

 

 

*G4

Enable type 2 security with password check and call-back.

 

 

*G5

Enable type 2 security with password check and call-back, remote site enters the call-

 

back number.

 

 

Specifications and Function Description

2-9