ZyXEL G-1000 v2 User's Guide
17.5 System Timeout
There is a system timeout of five minutes (300 seconds) for Telnet/web/FTP connections.
Your G-1000 v2 will automatically log you out if you do nothing in this timeout period, except
when it is continuously updating the status in menu 24.1 or when sys stdio has been
changed on the command line.
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Chapter 17 System Maintenance and Information