By Ron Olexa
This isn't one other e-book approximately fitting a house or pastime wireless method. as a substitute, this ebook exhibits you ways to devise, layout, set up, and function WLAN structures in companies, associations, and public settings akin to libraries and lodges. In different phrases, this booklet is filled with critical info for critical execs answerable for enforcing strong, excessive functionality WLANs masking components as small as a espresso store or as huge as complete communities.Ron Olexa presents a great starting place in RF/wireless concept because it applies to WLANs. His certain, thorough insurance of propagation at GHz frequencies is helping you already know the mysteries of WLAN assurance (such as the way it can switch from season to season as a result of foliage). Youll additionally know about antenna radiation styles and achieve so that you can layout you WLAN to have the assurance you would like with out inflicting interference to (or agony interference from) different WLANs.* Covers the generally used 802.11 kinfolk, in addition to the recent 802.16 and 802.20 criteria* specializes in massive advertisement community implementations, corresponding to in public structures and companies* writer has over 25 years of expertise with mobile platforms and instant networks
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Implementing 802.11, 802.16 and 802.20 wireless networks: planning, troubleshooting, and maintenance
This isn't one other ebook approximately fitting a house or pastime wireless process. in its place, this booklet indicates you ways to devise, layout, set up, and function WLAN structures in companies, associations, and public settings resembling libraries and resorts. In different phrases, this booklet is filled with severe info for severe execs liable for enforcing powerful, excessive functionality WLANs overlaying components as small as a espresso store or as huge as whole groups.
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0000000001 mw Figure 2-10: dBm chart and power illustration Because of the vanishingly low signal power received by the antenna, the RF amplifier must generate minimal noise while increasing the signal voltage by a large factor. The specifications that denote the effectiveness of a weak-signal amplifier are sensitivity, defined as the ability to discern a weak signal, and the intercept 42 Basic Radio and RF Concepts point which defines how the device behaves in the presence of large signals. Design of an RF amplifier is always a trade-off between these two factors.
It is required to go through an FCC certification process. This certification is accomplished by an independent testing lab, which conducts tests and measurements on the equipment to assure that it meets the FCC’s technical requirements for the band in which it operates. S. The FCC publishes the results of these tests as public record. They can be found at the FCC Equipment Authorization System Generic Search web page. cfm. Knowing as little as the manufacturers name and the band of operation will allow you to use this search engine to identify certified equipment.
It is easier to get high gains in a directional antenna because it emits energy over less than 360 degrees. Common horizontal patterns are 180, 120, 100, 90, 60, 45, 30, and 15 degrees. 20 Wireless Networks These antennas are useful in providing controlled area coverage. Still others are designed to support point-to-point links. These antennas are made with a parabolic reflector that focuses the energy into a beam that can be as narrow as 2 degrees. As shown in Figure 2-8, as compared to a 120-degree antenna commonly used to provide wide area coverage, parabolic reflector antennas have too narrow a pattern for area coverage, but because of their high gain can be used to extend the range of a system to a fixed location outside the nominal coverage area provided by the wider beamwidth antenna.