Actually...my bad! Looking at the 2106ds, The F connector and the 115volt plug on the right side is for any TV [power and signal] you have mounted outside at the Backer Location.
Blubugger

post a pic of it

If you are pointing to the F type [television] connector right below the 115volt outlet: it is for the TV signal should you want to get cable TV reception at your local or travelling RV Park. Hope this helps!

cms