The major benefit of fibre cable is the capability to transmit data at exceptionally high speed over long distances without suffering from signal degradation. Since the 1970s fibre cables have been laid alongside railway lines across the country as the cable is not affected by high voltage Electro Magnetic Radiation from the track or the train’s electric motors. Fibre cables are also suspended within or alongside electrical cable on pylons making the expansion of country wide communications easier.
The benefits of fibre optic cables are achieved with LED or laser light travelling down glass tubes with diameters of 62.5 microns down to 9 microns. This light is not prone to degradation over distance as is the case with electrical signals. The secondary advantage is its resilience to external influences such as weather, water ingress and electrical interference including lightning.
For these reasons fibre optic cables are particularly suited for long distance network links as well as in factories, workshops and assembly plants where electrical interference from large motors and welders could interfere with the electrical signalling.