subject: Foreword Keen On Wi-fi Spectrum Analysis [print this page] Wi-Fi as the majority populace is on familiar terms with it is designed around two parameters: as much speed as cheaply as likely. What is absent is the "reliability" prerequisite.
Well, for most people, Wi-Fi seems reliable "enough." Dropouts are rare, and the team only works if you on your laptop. This is not always the case when they start to connect to multiple clients in the same area. This is not always the case in enterprise environments. This is not always the case when it starts to fill their systems with the variety of electronic devices that set the tone in the air can.
What I mean by the last point, Wi-Fi (802.11b, 802.11g, 802.11n, and soon to be) in the 2.4 GHz industrial scientific and medical (ISM). This frequency range is not allowed. This means that each company is free to use this frequency as they see fit (provided they meet emission standards for this country!) To see. This means that the belt tends to fill. This is not just Wi-Fi. Microwave ovens, Bluetooth and some cordless phones, transmitting A / V, baby monitors and wireless cameras, etc. can make noise in this band.
A lot of installers try to optimize their clients WiFi installs by strategically choosing a subset of the 2.4 GHz band to exchange a few words over. So how can you do the same?
Let's start with some basic information. WiFi is divided into 11 channels across the entire 2.4 GHz spectrum. If an installer, you can use a wireless router sends all traffic on channel 6, for example. All persons who are connected to the router, are also to communicate on the same channel. What is known is that the wireless communications across multiple channels - focused on the selected channel. In the example above, it was decided to give 6-channel In fact, the router connected clients, and channels 4, 5, 7 and 8 (two channels on either side of Figure 6). A general rule is to try to the channels 1, 6 and 11 maintain that no interference between adjacent systems, in which the number of possible networks in the same place.
At the present that we have that out of the way, how does an installer go about determining what channel to place his equipment on? There are two types of tools that need to be consulted.
Spectrum analyzer to determine where the sources of noise are
Wi-Fi scanner to determine what other Wi-Fi networks are running within reception range.
A spectrum is essentially "listens" to a certain range and displays the results to interpret for you. It is here to tell you how much seeing the "power" at each frequency. If an installer, try to identify trends in the series, and eventually you become an expert in the identification of these models and their association with certain devices. Based on diet and at each frequency, we can identify, represent gaps or areas of less power, to his team to watch. A spectrum analyzer is truly affordable Wi-Spy. Australia can be traced Wi-Spy Australia or the United States in the mutagen. Chanalyzer is the main software used with the Wi-Spy, and you can watch videos of Chanalyzer in use [http://www.tesca.in] see the link.
Most (un) known WiFi scanner for Windows, Netscape dry. When executed, the software is different SSID and channel number corresponding instantaneous signal to noise ratio (SNR). Try the camera in a place where there are other Wi-Fi channels are used, or overlap with those with the lowest SNR, if you can not find a free channel. Again trying to keep on channel 1, 6 and 11 if possible. Keep in mind, an eye, where the sound sources are based on information from the spectrum analyzer based on love.
