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800 MHz Broadcast television operating frequencies range from 54 to 800 MHz, microwave ovens are typically around 1250 or 2400 MHz, and microwave radio and satellite links operate in various bands to over 10 GHz Many radar systems operate in a couple of bands around 13 GHz (C band) and around 9 GHz (X band) Similar operating frequencies are used in other countries, with worldwide coordination done through the International Telecommunication Union (ITU) The most significant bands for wireless LANs (WLANs) are 900 MHz (actually 902 928 MHz), 24 GHz (2400 2483 MHz), and 5 GHz (5150 5250 MHz, 5250 5350 MHz, and 5725 5825 MHz) These are existing bands designated for industrial, scientific, and medical applications Most of the current WLAN equipment uses the 24 GHz band (such as 80211b and g), while some of the newer high-speed equipment is targeted for the 5 GHz band (80211a) This band s low-power, unlicensed operation minimizes potential interference by limiting the distance that the signal can travel Other popular WLAN technologies include Bluetooth and WiMAX An older cellular wireless networking standard, CDPD, and a newer GSM wireless standard, GPRS, exists in the cell phone bands, but they are wireless WAN access standards, not really WLAN standards Modulation The information we transmit over a radio frequency is (RF) placed on the carrier wave by a process called modulation A wide variety of modulation schemes exist, but they basically are variations of either amplitude or frequency/phase modulation, sometimes with multiple carriers The AM broadcast band is the simplest example of amplitude modulation The carrier is simply increased or decreased in intensity by the amplitude of an audio signal In contrast, FM broadcast transmission makes the frequency of the output vary in proportion to the audio signal Wireless networking uses several variations of these modulation methods to allow high-speed data to be modulated into an RF signal Popular modulation techniques include one that causes the base or carrier frequency of the transmission to hop around among a select number of discrete frequencies, while encoding the data varying both the amplitude and phase of the signal This encoding is similar to the encoding and modulation methods we use for high-speed modems, with the addition of this frequency hopping behavior Another modulation technique digitally spreads the transmitted signal within a channel bandwidth The formal name for either of these jumping-bean or spread-out transmissions is spread-spectrum operation We will cover more on the reasons for using this technique a little later The two spread spectrum techniques described above are frequency hopping and direct sequence, although there are others.

7 Save the plist file 8 Click Build And Go, and the changes appear in the Settings application (Figure 14-13)

Figure 78 The Configuration dialog for the LinkSys WMP11 gives you access to a few basic parameters the most important of which is the SSID of the network to which you wish to connect You will have to interact with this dialog, or the Site Survey dialog in Figure 79 and the Encryption dialog shown in Figure 710, each time you change networks

FIGURE 132 Line-of-sight operation: Radio-frequency signals at ultra-high frequencies are blocked by obstructions

14:

Figure 14-12

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Line-of-Sight Concepts One of the most important rules in the operation of wireless LANs is that the technology operates only in a straight line, with a relatively unencumbered path This is called line-of-sight operation, because you can usually operate the connection satisfactorily between two points if you can see between them, within obvious range limits (Fig 132) In the upper frequencies of radio transmission, such as those bands used for WLANs, the electromagnetic waves tend to be incapable of penetrating dense objects, particularly those with any surface conductivity In other words, air and glass are no problem, steel and other metals are, and everything else in between is well, in between Many materials will cause an attenuation of the signal Plasterboard and plaster are mild attenuators; cement and cinderblock walls are bad, and steel enclosures are worse The use of foil-covered wallboard, metal wall studs, reinforcing bars, or mesh greatly increases the attenuation of the wireless signal Reflections of a signal may occur because of highly conductive objects in the area of either the transmitter or the receiver For example, a signal might bounce off a metal door, a steel file cabinet, or even a parked truck If the signal travels to the receiver both via a direct and a reflected path, an interference problem called multipath interference can occur If the two signals are of similar strengths and arrive at the receiver out of phase, it may be impossible to recover a usable signal We commonly see this phenomenon on a broadcast television signal as a ghost image when the antenna is misaligned or when large reflective objects are nearby Antenna Operation Antennas operate by capturing the transmitted electromagnetic field and converting the energy to an electrical signal of the same frequency All of the information that

Figure 14-13

Figure 79 The Site Survey dialog for the WMP11 shows you all available wireless networks, similar to Windows XP s View Available Wireless Networks dialog From the list, you can select a different network to connect to

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