ZyXEL U-1496S Plus User Guide - Page 68

DISCONNECT LEASED LINE Disconnecting (manually) the leased line will force the U-1496 to switch to the IDLE STATUS screen. Either manually on-line or, if you have set the leased line as the power-on default, turning the power OFF and ON will make the modem go to the leased line again. On the U-1496E, pressing the VOICE/DATA switch will toggle the modem on/off the connected leased line. Chapter Twelve - SPECIAL FUNCTIONS This chapter describes the special features of U-1496 series modems, their functions and uses. SECURITY FUNCTION The U-1496 series modems provide a security function. When enabled, an unauthorized user cannot dial in and make a connection. Two types of security functions are provided. Type 1 security is used when the remote modem is also a U-1496 series modem; type 2 security function is used when the remote modem is any other brand modem. In the type 1 connection, the dial-in (remote) modem will send in its supervisory password for checking at the initial connection handshaking, and the local modem will check this password against its pre-stored acceptable password list. In 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. In level 1 security, the local modem will maintain the connection if the password checking is OK, otherwise the line is disconnected. In level 2 security, if the password is found in local modem's pre-stored acceptable list, it will disconnect the line, dial back at the phone number corresponding to the dial-in password. The line is simply disconnected if the password does not match. There can be 10 user passwords, the corresponding 10 dial back numbers are common to the modem's 10 stored phone numbers. Any character (0-255) can be used in the password, the maximum password length is 8 characters. Security function is only accessible through AT command in terminal mode. Any access attempt will be prompted to enter the supervisory password, the attempt will be rejected if the entered password is not correct. The default supervisory password is "ZyXEL" when modem is shipped out from the factory. This supervisory password is also the password sent for automatic password checking in type 1 connection. To modify the supervisory password, use AT*HS You will be asked for original password and new password and then asked to re-enter new password for verification. For example: Password: (Enter supervisory password) ***** Password: (Enter new supervisory password) ***** Verify: (Enter the new supervisory password again) OK