Introduction Into Wi-Fi Spectrum Analysis


Wi fi as most people know it is designed around two ranges: as much speed as cheaply as possible. What is missing is definitely the “reliability” requirement.

Now, for most people, Wi-Fi seems to be reliable “enough”. Drop outs are rare and the equipment just will work when you turn on your laptop. This is not always the case whenever you start to get multiple clients connected within the same area. It’s not always the case in corporate environments. This is not always scenario once you start to populate your premises with the multitude of electronic devices which can spew noise into the airspace.

What do I mean by the last issue? Wi-Fi (802. 11b, 802. 11g and soon to generally be 802. 11n) operates on the 2 . 4GHz Industry Clinical and Medical (ISM) band. This particular range of frequencies can be unlicensed. This means that every company is free to use this assortment in any way they see fit (provided they meet the emission benchmarks for that country!! ). This means that the band tends to have crowded. It is not just Wi-Fi. Microwaves, Bluetooth devices as well as some cordless phones, A/V senders, baby monitors, and mobile cameras etc . can emit noise into this group.

Many installers try to optimise their client’s WiFi installation by strategically choosing a subset of the 2 . 4Ghz strap to communicate over. So how can you do the same?

Let’s start off with some background info. WiFi is broken up towards 11 channels along the 2 . 4Ghz spectrum. As an élever, you can specify that a wireless router send all website broadcast traffic over channel 6 for example. All people that connect to of which router will also communicate on the same channel. What is not often known is that Wi-Fi will spread out communications over a very few channels – centred on the chosen channel. In the previous case, I chose channel 6. In reality, the wireless router plus connected clients will also be using channels 4, 5, six and 8 (2 channels on either side with 6). A general rule of thumb is to try and stick to channels you, 6 and 11 to ensure the least interference between immediate networks while still maximising the number of potential networks in the one site.

Now that we have that out of the way, how does a strong installer go about determining what channel to place his machines on? There are two types of tools that need to be consulted.

Wyebot proactively analyzes WiFi networks, identifying and solving problems before they cause damaging downtime. Connect with Wyebot for an optimized network supporting all your business needs.

  1. Assortment analyzer to determine where the sources of noise are
    2. Wi-Fi code reader to determine what other Wi-Fi networks are running within reception assortment.

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