Bruce Alexander's 802.11 wireless network site surveying and installation PDF

By Bruce Alexander

ISBN-10: 1587051648

ISBN-13: 9781587051647

802.11 instant community website Surveying and deploy starts off with an creation to WLAN architectures and definitions after which strikes directly to web site survey methodologies, assisting you examine and tackle your site's particular wishes. The booklet delves into the deploy procedure for WLAN gear, together with the principles and laws to which WLANs needs to adhere, a number of hindrances that come up while fitting WLAN gear, and how one can attach WLAN items to the stressed community. 802.11 instant community website Surveying and set up is the complete consultant to acting a WLAN website survey and effectively fitting your 802.11 instant network.This booklet is a part of the Networking expertise sequence from Cisco Press, which bargains networking pros priceless details for developing effective networks, realizing new applied sciences, and construction profitable careers.

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Cell sizes at given data rate can be thought of as concentric circles with higher data-rate circles nested within the coverage area of the immediately higher data rate. Selecting only the highest data rate will require a greater number of APs to cover a given area; therefore, care must be taken to develop a compromise between required aggregate data rate and overall system cost. An example of data rate versus range is shown in Figure 2-18. Figure 2-18. Data Rate Versus Range Part I: Understanding the Prerequisites of a Site Survey 59 60 Part I: Understanding the Prerequisites of a Site Survey Modulation Versus Coverage Another factor that can affect range and coverage is the modulation scheme.

Today, a 56-kbps modem gets much higher speeds over the same phone line as the 300-baud modem. This increase in speed results in the modem compressing the data into the same amount of space (or spectrum in the case of RF) and using the same overall bandwidth of the phone line as the 300-baud modem used. One problem that may arise is that any noise on the phone line will reduce the modem speed. As the data is further compressed, it requires a stronger signal as compared to the noise level. More noise means slower speed for the data to be received correctly.

The size of the balloon represents the amount of RF energy that the transmitter is sending to the antennas, and the antenna is converting the energy to radiated RF energy. As you learn about other antenna types, you will see that the overall energy radiated from the antenna is not increased, it is just redirected. As was the case with the dipole antenna discussed earlier in this chapter, this perfect round balloon of energy that an isotropic antenna provides becomes something totally different in shape.

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802.11 wireless network site surveying and installation by Bruce Alexander


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