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the foundation for telecommunications networks

22 kwietnia 2021, 14:24
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This new architecture positioned the cable industry to deliver video, voice, and data services. The nonprofit CableLabs consortium (described in greater detail in Chapter 2) was established to address end-to-end issues

Its activities are supported by subscription and testing fees paid by its members. CableLabs helped foster the introduction of digital transmission and the hybrid fiber co-axial cable architecture found in modern cable systems and developed a series of specifications for cable modems known as the Data Over Cable System Interface Specification.
Physical connectivity is the foundation for telecommunications networks. Imagine that the United States had never deployed copper wires and coaxial cable to connect its homes and businesses and now wanted to design the best possible telecommunications infrastructure. There is little doubt about the best design choice—optical fiber for high bandwidth complemented by wireless for mobility and flexibility. Optical communications would give everyone the greatest possible amount of bandwidth, would be useful for essentially all applications that have been imagined, and would be future proof—it is known how to continually get more
and more bandwidth out of each fiber. The cost of installing the fiber would be no greater than the cost of a new installation of any other medium.

Today U.S. telecommunications infrastructure has little fiber to the premises, although fiber makes up most long-haul and metropolitan area networks. Realizing the goal of fiber everywhere involves a number of problems requiring research. For example, while the cost of optical components is not a significant problem in core networks because the cost is spread across many users, the components represent a nontrivial expense for local access networks, which serve only one user or a handful of users. How can the cost of optical components be reduced sufficiently to make fiber to the home affordable? What architectural approaches offer the best mix of affordability, performance, and evolvability? What are the future applications that will drive the need for increasing bandwidth

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