Does D7800 compatible to fiber optic ?

[antinode]

   Visit http://netgear.com/support , put in your model number, and look
for Documentation.  Get the User Manual.  Look for "Set Up the Modem
Router for Cable or Fiber Service".

[michaelkenward]

There is a manual for the D7800 somewhere at the end of this link:

>>> D7800 | Product | Support | NETGEAR <<<

See page 32.