About telecom networks
The telecommunications of the world depend heavily on all kinds of fiber optics; in terrestrial fiber optic networks, systems, data centers, colocation and hosting facilities, just to name a few. Terminating equipment, routers, switches etc. are primarily connected together using fiber optics.
In order for voice, video or other data to be transmitted between any two or more locations in the world, using the Internet or by dedicated circuits, fiber optics always play a big part.
The Internet exchanges, data centers, colocation and hosting facilities of the world are interconnected by a network of terrestrial and submarine fiber optic cables.
TeleGeography, a telecommunications market and research firm, provides excellent interactive maps showing the main Internet Exchanges and Submarine Cables of the world: