What type of electrical interference can be caused by computer network equipment?
Why Computer and network gear runs on crystal-controlled clock oscillators, and those clocks (plus their harmonics and the data streams riding on Ethernet cables) radiate as discrete carriers landing on specific, repeatable frequencies. On the air they show up as birdies that may be bare carriers or may be smeared and modulated by the data traffic, and they can drift or come and go as the equipment's clocks and load change. Switching power supplies in the same equipment add to the harmonic comb.
Watch out A loud AC hum points to a power supply or ground problem at 60/120 Hz, the clicking every few seconds is the classic electric fence charger signature, and a pulsing whine is typical of a vehicle alternator or a variable-speed motor, none of which are clock-derived.
Digital clocks make birdies: network gear gives signals on specific frequencies, not hum, clicks or whine.