Buku PDF Fundamentals of Telecommunications

Fundamentals of Telecommunications

Second Edition
Roger L. Freeman

INTRODUCTORY CONCEPTS

1.1 WHAT IS TELECOMMUNICATION?

Many people call telecommunication the world’s must lucrative industry. In the United States, 110 million households have telephones and 50% of total households in the U.S. have Internet access and there are some 170 million mobile subscribers. Long-distance service annual revenues as of 2004 exceeded 100 × 109 dollars.1 Prior to divestiture (1983), the Bell System was the largest commercial company in the United States. It had the biggest fleet of vehicles, the most employees, and the greatest income. Every retiree with any sense held the safe and dependable Bell stock. Bell System could not be found on the “Fortune 500” listing of the largest companies. In 1982, Western Electric Co., the Bell System manufacturing arm, was number seven on the “Fortune 500.” However, if one checked the “Fortune 100 Utilities,” the Bell System was up on the top. Transferring this information to the “Fortune 500” put Bell System as the leader on the list. We know it is big business; but what is telecommunications? Webster’s (Ref. 1) calls it communications at a distance. The IEEE Standard Dictionary (Ref. 2) defines telecommunications as the transmission of signals over long distance, such as by telegraph, radio, or television. Another term we often hear is electrical communication. This is a descriptive term, but of somewhat broader scope. Some take the view that telecommunication deals only with voice telephony, and the typical provider of this service is the local telephone company. We hold a wider interpretation. Telecommunication encompasses the electrical communication at a distance of voice, data, and image information (e.g., TV and facsimile). These media, therefore, will be major topics of this book. The word media (medium, singular) also is used to describe what is transporting telecommunication signals. This is termed transmission media. There are four basic types of medium: wire pair, coaxial cable, fiber optics, and radio.

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