4-1

7112-A2-GB20-20 March 1998
Security 4
Overview
The DSU/CSU provides several methods of security by limiting user access to the
ATI through option settings. Refer to

ATI Access

on page 4-4.
Enable the Login Required option to require a Login ID for the:
— Terminal Port
— Telnet Session
Limit the access:
— Port Access Level option of 1, 2, or 3 for the Terminal port
— Session Access Level option of 1, 2, or 3 for the Telnet Session
Disable the access:
— Telnet Session option
— Facility Data Link (FDL) option
— Ethernet Port Use option
SNMP security is handled through Community Names with access levels and
IP address validation. Refer to

Controlling SNMP Access

on page 4-6.