Night Owl PRO-1681TB-2DMA user manual - Manual (Page 46)

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Chapter 15: Advanced Menu
Advanced Menu
Use this menu to access the Alarm, Network, Comm, and PTZ menus.
Be sure to Apply all changes made to the menus. If you do not
apply the changes, they will not be saved.
You can select the
Default button on any page to restore the
DVR’s original settings.