11 The New Access Network Systems and Enabling Technologies
11.1 Introduction
Different factors have pushed the evolution of the access network from its copper-based architecture to a fiber-based one.
Besides bandwidth increase impelled by the introduction of new services (see Chapter 2, the penetration of ultra-broadband connections stresses the capacity of existing copper cables tosupport a high number of very fast xDSLs. In many cases, copper cables deployed before the diffusion of broadband access presents a non-negligible pair-to-pair interference when xDSL is used. Often, this phenomenon sets a limit to the number of connections possible in a given area, depending on the quality and length of the cables [1].
Moreover, the need of the ...
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