Cẩm nang dữ liệu không dây P6

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Cẩm nang dữ liệu không dây P6

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PUBLIC SATELLITE NETWORKS Satellites have been carrying communications since the early 1960s, serving as relays for voice, video, or data. They have long been dominated by the military and, in their direct broadcast form, by large television communications companies. In 1989 the Gartner Group believed that “the mobile satellite industry will be one of the great growth markets of the next decade—surpassing cellular telephones and digital paging, and in the same league as personal computers.”1 Gartner believed that there would be 800,000 satellite data terminals installed by 1993, growing to 2 million by 1995. A flood of vendors rushed toward this...

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