Any thing that deals with a network infrastructure is on a battery back up that is also a conditional and surge protector. I know my building has a build in surge protector. We have red, blue, and white outlets in the rooms. Red is emergency and will have power from the generator blue are power conditioned and white is normal.
Plus I don't know about anyone else but there is a range that is used like 55 to 65 Hz if it is anywhere in that range you are fine. Out side of that causes power with electric stuff.