ZyXEL Communications 2864I - Manual (Page 129)

116 Telnet Configuration and Capabilities
IP in menu 1, telnet will still be available provided you assign
the Prestige an IP address.
Telnet Capabilities
Single Administrator
To prevent confusion and discrepancy on the configuration,
Prestige will only allow one terminal connection at any time.
Prestige also gives priority to the RS-232 connection over
telnet . If you have already connected to the Prestige via
telnet , you will be logged out if another user is connecting to the
Prestige via the RS-232 cable. Only after the other administrator
has been disconnected will you be able to
telnet to the Prestige
again.
System Timeout
When you are connected to the Prestige via telnet , there is a
system timeout of 5 minutes (300 seconds). If you are not
configuring the device and leave it inactive for this timeout period,
then the Prestige will automatically disconnect you.