What is Dark Fiber ?
As its name suggests, it is a fiber without light. It is, then, the optical fiber "without illuminating" , or what is the same, installed but not used. That is, it is the infrastructure that is ready for future customers to buy the bandwidth and on it to open the way to the technology that best suits them. The tubes that are installed under the ground to transport -among other things- fiber optics, usually have a higher capacity than the demand for communications requires. It is understandable, then, that the operating companies to open the streets decide to leave installed "threads" without using to avoid having to raise the floors every time the demand for connections increases. The best analogy is that of a traffic jam: if by a road that connects two cities pass many cars, by expanding that road the vehicles will circulate more fluidly, and even more cars can pass by there. In other words, they will increase the capacity and speed of the circulation. Hence, those conduits so wide that they build and bury the companies, because they foresee that every time we will need more capacity and speed to transfer and conserve data. In addition, they can do business by offering their infrastructure to other operators.
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