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Dynamic Frequency Selection (DFS) is a channel allocation scheme specified for wireless LANs, commonly known as Wi-Fi. It is designed to prevent electromagnetic interference by avoiding co-channel operation with systems that predated Wi-Fi, such as military radar , satellite communication , and weather radar , and also to provide on aggregate a ...
Wireless LAN (WLAN) channels are frequently accessed using IEEE 802.11 protocols. The 802.11 standard provides several radio frequency bands for use in Wi-Fi communications, each divided into a multitude of channels numbered at 5 MHz spacing (except in the 45/60 GHz band, where they are 0.54/1.08/2.16 GHz apart) between the centre frequency of the channel.
IEEE 802.11h-2003, or simply 802.11h, refers to a 2003 amendment added to the IEEE 802.11 standard for Spectrum and Transmit Power Management Extensions. It addresses problems like interference with satellites and radar using the same 5 GHz frequency band. [1]
There are some channels that have a special use case called DFS, and it would be a good enhancement of this page to list DFS only channels. My understanding is that 5.25~5.35GHz (Ch52~64) and 5.47~5.725GHz (Ch100~140) can only be used if you do DFS properly and have your radio licensed as being DFS compliant.
My neighbors' 5 GHz channels are all using the non-DFS channels -- now that I have moved to a DFS channel, I have no other signals competing with mine. This is interesting -- it might not make much real-world difference -- but as of now, there's a giant (DFS) band in the middle of the 5 GHz spectrum that I can use all by myself!
The reason given is: UNII-1 Power limit has been raised by FCC (USA). Channels 120-128 are now allowed using DFS (USA). UNII-4 now allowed (USA). 6GHz spectrum graph not present to reflect UNII 5/6/7/8 which is now active in WiFi 6E (USA).. Please help update this article to reflect recent events or newly available information. (May 2023)
In Fixed Channel Allocation or Fixed Channel Assignment (FCA) each cell is given a predetermined set of frequency channels. FCA requires manual frequency planning, which is an arduous task in time-division multiple access (TDMA) and frequency-division multiple access (FDMA) based systems since such systems are highly sensitive to co-channel interference from nearby cells that are reusing the ...
Designed as a hybrid integration between Kodi/XBMC media center software and Dreambox's Enigma2 PVR software scripts, running on an OpenPLi forked from PLi git (which in turn is based on OpenEmbedded Linux operating system for embedded systems), it is as such also fully compatible with PLi plugins and coding infrastructure.