NETGEAR XM128 ISDN manual Level 1 Security, Level 2 Security, Table B-1 Types of security

Reference Guide for the Model XM128 ISDN Digital Modem

The two types of security are summarized in Table B-1.

Table B-1.	Types of security
		Type 1 Security	Type 2 Security
Remote (Calling) Site		NETGEAR ISDN device only	Can be modem of any brand
Password Check		Automatic	Interactive
Protocols Supported		X.75, V.120	Any data protocol
AT Commands		*G1 for Level 1 security	*G3 for Level 1 security
		*G2 for Level 2 security	*G4 for Level 2 security
			*G5 for Level 3 security

Level 1 Security

This security level performs only password checking. With Level 1 security, the local modem maintains the connection if the password is matched. Otherwise, the line is disconnected.

Level 2 Security

Level 2 security provides extra calling party number (CPN) checking and callback. The callback number is prestored in the password table. If the password has been matched (in a maximum of three tries over a 40-second time period) with its prestored password list, the local modem checks the calling party number (or origination address for 1TR6) against the prestored number corresponding to the password. If they are matched, the local modem chooses either to keep the connection or to disconnect; then it calls back according to the following settings of bit 6 of S119:

•S119.6=0

This setting prompts the modem to connect and then to call back.

•S119.6=1

This setting prompts the modem to keep the connection.

If the CPN does not match what is stored in the table, the local modem disconnects the call. If CPN is unavailable in the setup message, the local modem disconnects the call and calls back using the prestored number corresponding to the dial-in password.

B-2 Security Functions