Power - All electronics require it. If there is any loss all internet is lost. What is the difference between AC/DC , high voltage low voltage? Current vs voltage. This details from the point the power comes out of a generator to how a site has its emergency generators powering it and how it interfaces with equipment, how all of this is handled. How does your internet provider handle power equipment and what do they do differently to allow them to have nonstop power and backup power in case the grid goes down.