Download e-book for iPad: 802.11 wireless network site surveying and installation by Bruce Alexander

By Bruce Alexander

802.11 instant community website Surveying and deploy starts off with an advent to WLAN architectures and definitions after which strikes directly to website survey methodologies, supporting you check and handle your site's particular wishes. The booklet delves into the set up approach for WLAN apparatus, together with the principles and laws to which WLANs needs to adhere, a variety of stumbling blocks that come up whilst fitting WLAN apparatus, and how one can attach WLAN items to the stressed community. 802.11 instant community web site Surveying and set up is your entire advisor to acting a WLAN website survey and effectively fitting your 802.11 instant network.This e-book is a part of the Networking know-how sequence from Cisco Press, which bargains networking execs useful info for developing effective networks, figuring out new applied sciences, and construction profitable careers.

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Understanding RF Power Values RF signals are subject to various losses and gains as they pass from a transmitter through the cable to its antenna, then through the air (and other obstructions such as 44 Part I: Understanding the Prerequisites of a Site Survey Part I: Understanding the Prerequisites of a Site Survey 45 walls and doors), to the receiving antenna, through that cable, and finally to the receiving radio. With the exception of the walls and other obstructions, most of these signal-loss factors are known and can be used in the design process to determine whether an RF system such as a WLAN will work.

Frequency Back in 1864, the Scottish theoretician James Clerk Maxwell first developed the idea that electromagnetic waves arose as an electric current and changed direction. In the 1880s, Heinrich Hertz used this idea to develop the first RF device that sent and then received electromagnetic waves over the air. This radio was capable of increasing the number or frequency of waves produced in a given period of time and how fast they changed. Based on this discovery, his name became a common unit of measure for frequency, where 1 hertz (Hz) means one complete oscillation, or cycle, per second.

When an omni antenna is designed to have higher gain, it results in loss of coverage in certain areas. Part I: Understanding the Prerequisites of a Site Survey 49 50 Part I: Understanding the Prerequisites of a Site Survey Imagine again, the balloon of energy for an isotropic antenna, which extends from the antenna equally in all directions. Now imagine pressing in on the top and bottom of the balloon. This causes the balloon to expand in an outward direction, covering more area in the horizontal pattern, but reducing the coverage area above and below the antenna.

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