DFS = Dynamic Frequency Selection
5 GHz RLAN; Harmonised Standard covering the essential requirements of article 3.2 of Directive 2014/53/EU [etsi.org] (Seite 20f.)
Siehe auch: Allgemeinzuteilung von Frequenzen in den Bereichen 5150 MHz - 5350 MHz und 5470 MHz - 5725 MHz für Funkanwendungen zur breitbandigen Datenübertragung, WAS/WLAN („Wireless Access Systems including Wireless Local Area Networks“) [bundesnetzagentur.de]
An RLAN shall employ a Dynamic Frequency Selection (DFS) function to:
• detect interference from radar systems (radar detection) and to avoid co-channel operation with these systems;
• provide on aggregate a near-uniform loading of the spectrum (Uniform Spreading).
[…]
Radar detection shall be used when operating on channels whose nominal bandwidth falls partly or completely within the frequency ranges 5 250 MHz to 5 350 MHz or 5 470 MHz to 5 725 MHz. This requirement applies to all types of RLAN devices regardless of the type of communication between these devices.
Uniform Spreading is required across the frequency ranges 5 150 MHz to 5 350 MHz and 5 470 MHz to 5 725 MHz. Uniform Spreading is not applicable for equipment that only operates in the band 5 150 MHz to 5 250 MHz.
Siehe auch: Allgemeinzuteilung von Frequenzen in den Bereichen 5150 MHz - 5350 MHz und 5470 MHz - 5725 MHz für Funkanwendungen zur breitbandigen Datenübertragung, WAS/WLAN („Wireless Access Systems including Wireless Local Area Networks“) [bundesnetzagentur.de]