We recommend you have a spectrum policy to help minimize wireless network disruptions caused by sources of interference introduced into your network. To mitigate this issue, provide a spectrum policy that informs all users about the types of devices that are not permitted at your deployment site.Īdditional sources of interference are even more of a problem for static channel plans, (where auto channel selection is disabled), because manual intervention is required to locate and remove the source of the interference or to change the channel plan to avoid the interference. Unwanted sources of interference from devices such as rogue APs, cordless phones, and non-Wi-Fi cameras can reduce wireless network performance. It is preferable that wireless networks not routinely change their channel plan because channel plan changes can be disruptive to the wireless network. When you enable ACD/DCS (auto channel) selection, APs select channels to avoid both Wi-Fi and non-Wi-Fi interference. The interference data is collected by the DCS (Dynamic Channel Selection) algorithm for more informed AP channel changes that result in improved overall network performance and user experience. The Smart Spectrum feature in WatchGuard Wi-Fi Cloud detects and identifies interference sources, both Wi-Fi and non-Wi-Fi. Source: Metageek Wi-Fi Cloud Smart Spectrum Fortunately, Bluetooth devices do not stay on a single frequency for very long and they operate with relatively low power, so their impact is limited.īluetooth frequency spectrum chart. Source: Metageek Bluetoothīluetooth devices are frequency hoppers that can affect all channels in the 2.4 GHz band. Do not put APs near microwave ovens, but when it is unavoidable, we recommend you use channel 1 for the 2.4 GHz radio. Microwave ovens have been known to have severe impacts on performance for nearby APs and clients operating on channels 6 to13. Microwave ovens operate in the upper channels of the 2.4 GHz band. Xbox game controller frequency spectrum chart. Though the channel utilization of these devices is quite low, these controllers can adversely affect Wi-Fi performance in the 2.4 GHz band. Game controllers use their own frequencies and use frequency-hopping. Game controllers for the Microsoft Xbox use non-Wi-Fi 2.4 GHz wireless technology. Neighborhood APs and clients external to your network.Poorly designed wireless network or misconfiguration.To help you to identify sources of interference, you can perform a spectrum analysis during the pre-installation and post-deployment phases. To optimize the performance of your wireless network you must be able to identify, locate and avoid sources of interference. Interference caused by Wi-Fi or non-Wi-Fi devices can greatly reduce performance of wireless networks. If you have a -41 dBm signal strength, and a -96 dBm noise level, this results in an excellent signal-to-noise ratio of +55 dB.If you have a -41 dBm signal strength, and a -50 dBm noise level, this results in a poor signal-to-noise ratio of +9 dB.Values lower than +25 dB result in poor performance and speeds. In general, your signal-to-noise ratio should be +25 dB or higher.This value is represented as a dB value.The signal-to-noise ratio (SNR) is the ratio between the signal strength and the noise level. For example, -96 dBm is a lower noise level than -20 dBm. Negative values indicate less background noise.The closer the value to 0, the greater the noise level.This is the power ratio in decibels (dB) of the measured power referenced to one milliwatt. Noise level is measured in dBm format (0 to -100).If the noise level is too high, it can degrade the strength and performance of your wireless signal.The noise level indicates the amount of background noise in your environment. For example, -41 dBm is a stronger signal than -61 dBm. The closer the value is to 0, the stronger the signal.Signal strength is represented in dBm format (0 to -100).Strong signal strength results in more reliable connections and higher speeds. The signal strength is the wireless signal power level received by the wireless client. To make sure that all users in your environment receive a strong wireless signal, consider these guidelines when you install your WatchGuard APs. Wireless Signal Strength and Noise Levels In this section, you determine where to put the APs and the wireless channels to use. With the information in the capacity planning section of this guide, you can determine how many APs are required for specific deployment use cases. AP Placement and Channel Plan Best Practices
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