Some disadvantages of using fiber optic cables:
fiber cables are more expensive to install compared to conventional cables having conventional metal wire conductors
fiber-optic cables are more fragile than metal wire conductors, so they must have adequate and strong protective sheathing to suit the environment in which they are to be installed
fiber-optic cables have higher costs for their electronic end-terminals compared to the end-terminals needed for conventional cables having metal wire conductors
fiber-optic cables are more difficult to split: more electronic end-terminal units must be used than for cables using conventional metal wire conductors.
Some advantages of using fiber optic cables:
very high maximum effective bandwidth
very long maximum distances between end terminals so that the costs of having to install and maintain intermediate repeaters can be saved
freedom from electro-magnetic interference.
Conventional cables, having metal wire conductors, suffer from the opposite of each of those factors:
low maximum effective bandwidth
short maximum distances between end-terminals and between any intermediate repeaters, so the extra costs of having to install – and maintain – several intermediate repeaters must be planned-for
they are always at risk from electro-magnetic interference unless they are efficiently shielded at extra cost.