By Frank J. Derfler, Les Freed, Frank Derfler
ISBN-10: 0768655544
ISBN-13: 9780768655544
ISBN-10: 0789724456
ISBN-13: 9780789724458
For introductory and common networking classes. How Networks paintings, Millennium version is a whole colour, illustrated consultant on networking know-how. This ebook offers the basics of networking with distinctive pictures that illustrate those recommendations. scholars will locate tough networking ideas defined in an easy-to-understand structure.
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Extra info for How Networks Work Millennium Edition
Example text
Keypunch operators didn't require extensive training because the keypunch keyboard resembled a standard typewriter keyboard. But the biggest disadvantage of the punched-card system was that it allowed only one program to run on the computer at one time. The next step forward in the human-machine interface was the interactive printing terminal. Instead of punching holes in a card, the terminal sent keystrokes directly to the computer. The computer responded by sending characters to the terminal's printer.
Edison had discovered that certain carbon compounds change their electrical resistance when subjected to varying pressure. Edison sandwiched a carbon button between a metal membrane and a metal support. When sound struck the membrane, it exerted pressure on the carbon button, varying the flow of electricity through the microphone. Despite the hostilities between Bell and Western Union, the Bell people were quick to realize the superiority of Edison's design. When the Bell v. Western Union lawsuit was settled in 1879, Bell took over rights to Edison's transmitter.
Rather than retaining patent rights, Edison often sold his patent rights to finance research in other areas. Page 12 CHAPTER 2 The Telephone Page 13 Alexander Graham Bell invented the telephone, right? Well, right and wrong. Although Bell has received the lion's share of the credit, several other inventors also played major roles in the development of the telephone. In 1861, German schoolteacher Phillip Reis created a device he called a telephone. Reis's device could transmit musical tones; had Reis spent more time refining the equipment, he might have succeeded in producing a viable voice telephone.