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32-4 At A, a client-server
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wireless LAN. At B, a peer-to-peer wireless LAN.
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lowest altitude is called perigee; the point of greatest altitude is called apogee. The apogee can be, and often is, much greater than the perigee. Such a satellite orbits at a speed that depends on its altitude. The lower the altitude, the faster the satellite moves. A satellite with an elliptical orbit crosses the sky rapidly when it is near perigee, and slowly when it is near apogee; it is easiest to use when its apogee is high above the horizon, because then it stays in the visible sky for a long time. Every time a MEO satellite completes one orbit, the earth rotates beneath it. The rotation of the earth rarely coincides with the orbital period of the satellite. Therefore, successive apogees for a MEO satellite occur over different points on the earth s surface. This makes the tracking of individual satellites a complicated business, requiring computers programmed with accurate orbital data. For a MEO system to be effective in providing worldwide coverage without localized periodic blackouts, the orbits must be diverse, yet coordinated in a precise and predictable way. In addition, there must be enough satellites so that each point on the earth is always on a line of sight with one or more of the satellites, and preferably, there should be at least one bird in sight near apogee at all times.
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Wireless Networks A local area network (LAN) is a group of computers linked together within a building, campus, or other small region. The interconnections in early LANs were made with wire cables, but wireless links are increasingly common. A wireless LAN offers flexibility, because the computer users can move around without having to bother with plugging and unplugging cables. This arrangement is
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ideal when notebook computers (also known as laptops) are used. The way in which a LAN is arranged is called the LAN topology. There are two major wireless LAN topologies: the client-server wireless LAN and the peer-to-peer wireless LAN. In the client-server topology (Fig. 32-4A), there is one large, powerful, central computer called a file server, to which all the smaller personal computers (labeled PC) are linked. The file server has enormous computing power, high speed, and large storage capacity, and can contain all the data for every user. End users do not communicate directly. All the data must pass through the file server. In a peer-to-peer LAN (Fig. 32-4B), all of the computers in the network are PCs with more or less equal computing power, speed, and storage capacity. Each user maintains his or her own data. Subscribers can, and almost always do, communicate directly without the data having to pass through any intermediary. This offers greater privacy and individuality than the client-server topology, but it is slower when a large number of users need to share data. Client-server LANs are favored by large institutions. Small businesses and schools, or departments within a larger corporation or university, prefer to use peer-to-peer LANs, mainly because they are cheaper and easier to maintain. In these illustrations, only three PCs are shown in the networks. But any LAN can have as few as two, or as many as several dozen, computers. Home Internet users sometimes employ a modified version of the arrangement shown in Fig. 324A. In place of the file server, a device called a wireless router provides a hub through which the computers can communicate. The router is connected to the Internet by a high-speed interface such as a cable modem, allowing several computers in a household to have Internet access at the same time.
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In most countries of the world, people can obtain government-issued licenses to send and receive messages by radio for nonprofessional purposes. In America, this hobby is called amateur radio or ham radio. If you want only to listen to communications and broadcasting, and not to transmit signals, you do not need a license in the United States (although you do need one in some countries).
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Who Uses Amateur Radio Anyone can use ham radio, provided they can pass the tests necessary to obtain a license. Amateur radio operators (or hams) can communicate in numerous modes, including voice, Morse code, television, and various forms of text messaging. Text messaging can be done in real time, or by posting messages similar to electronic mail (e-mail). Radio amateurs have set up their own radio networks. Some of these networks have Internet gateways. This mode is known as packet radio. Some radio hams chat about anything they can think of (except business matters, which are illegal to discuss via ham radio). Others like to practice emergency communications skills, so they can be of public service during crises such as hurricanes, earthquakes, or floods. Still others like to go out into the wilderness and talk to people far away while sitting out under the stars and using battery power. Amateur radio operators communicate from cars, boats, aircraft, and bicycles; this is called mobile operation. When transceivers are used while walking or hiking, it is known as portable or handheld operation. Amateur Equipment and Licensing A simple ham radio station has a transceiver (transmitter/receiver), a microphone, and an antenna. A small station can fit on a desktop, and is about the size of a home computer or hi-fi stereo system.
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