Defstat

A multilevel alert protocol, defstat, or defense status, was used to define the operations of all Imperial installations, including the Death Star.

Defstat 0 indicated the normal operation of the station. Defstat 1, only a warning, indicated that the station was on alert, and all defenses were upgraded to operational station. Defstat 2 indicated that an enemy craft had been identified in the space surrounding the craft's position. Defstat 3 was the highest level, indicating that the station was actively engaged in combat.

When the Empire took over Research Station Shantipole from the Alliance to Restore the Republic and the Verpine, they implemented the defstat protocols to secure and monitor the base.

Text and facts from the “Defstat” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.