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Consumer Electronics by S. P. Bali

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CHAPTER 42

DATA SERVICES

For most of its past history, telecommunications has been dominated by analog switching, transmission and frequency–division multiplexing. Telecommunication, networks in the 1980s underwent a process of rapid change. The conventional analog telephone was replaced steadily by computer controlled digital networks of immense capacity. The conversion of all telecommunication networks to digital switching and transmission will take some considerable time. Until then, digital and analog facilities must coexist, particularly in many developing countries. Voice is no longer the dominant feature around which networks are designed. From now on networks should carry all types of signals in a digital fashion.

The key concept of ...

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