Allied Telesis AT-S39 - Manual (Page 34)

Section II: Local or Telnet Management
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For information on enhanced stacking and how to manage different
switches from the same management session, refer to Chapter 4,
Enhanced Stacking on page 57.
Quitting from a
Local Session
To quit a local session, return to the Main Menu and type Q for Quit.
You should always exit from a management session when you are
finished managing a switch. This can prevent unauthorized individuals
from making changes to a switch’s configuration should you leave your
management station unattended.
Note
You cannot operate both a local management session and a Telnet
management session on the same switch simultaneously. Failure to
properly exit from a local or Telnet management session may block
future management sessions.