Also, fiber's high bandwidth and long distance capability allow all hub electronics to be centrally located, rather than distributed in closets throughout a building. Centralization reduces the cost of cabling and electronics, and reduces administration and maintenance efforts by making moves, adds and changes easier. Interfering signals from these sources can couple into copper cables creating sporadic problems that are difficult to troubleshoot and repair. Further, radiated emissions and susceptibility to external interference are almost entirely eliminated simply by the inherent design of optical cables. Fiber is immune to crosstalk .
Crosstalk occurs when unwanted signals are coupled between copper conductors.
Signals cannot couple between fibers in a cable, thus eliminating crosstalk. Fiber systems are easier to test . Even with higher data rates, fiber test requirements have not increased in complexity. Fiber provides greater reliability and equipment safety . Unlike copper facilities, all-dielectric fiber cabling systems do not conduct lightning strikes or electrical currents that can damage sensitive electronic transmission equipment.