ZyXEL Communications Omni TA128 - Manual (Page 100)

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Security Functions
The TA128 provides security functions that may be enabled to
prevent unauthorized connections. Two types of security functions
are provided.
Security Types and Levels
Type 1 security is to be used when the remote TA is a ZyXEL
ISDN TA.
Type 2 security is to be used with non-ZyXEL remote TA’s.
With a Type 1 connection, the dial-in (remote) TA will send in its
supervisor password for matching with the local TA128’s pre-
stored password list. With a Type 2 connection, the remote
terminal will be prompted to enter the password at the initial
connection and the local TA128 will match the entered password
with the pre-stored password list.
The two types of security are summarized in the table below:
Type 1 Security Type 2 Security
Remote
(Calling) Site ZyXEL ISDN device
only Can be TA of any
brand
Password
Check Automatic Interactive
Protocols
Supported X.75, V.120 Any data protocol
AT Commands *G1 for Level 1
security
*G2 for Level 2
security *G3 for Level 1
security
*G4 for Level 2
security
*G5 for Level 3
security