D-Link DSR-250N User Manual page 76

Unified Services Router

In the Scheduled days box, check that you want the schedule to be active for
―specific days‖. Select ―Saturday‖ and ―Sunday‖

In the scheduled time of day, select ―all day‖ – this will apply the schedule
between 12 am to 11:59 pm of the selected day.

Click apply – now schedule ―Weekend‖ isolates all day Saturday and
Sunday from the rest of the week.
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User Manual