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dynamic frequency selection (WLAN) (DFS)

Dynamic Frequency Selection (DFS) is used in WLANs according to 802.11 to select the transmit frequency. The automatic frequency selection required by the European Telecommunications Standards Institute( ETSI) in WLANs according to 802.11a has a direct influence on the transmit power, the Equivalent Isotropically Radiated Power( EIRP).

RegTP has made general approval for 802.11a networks dependent on whether they have Transmit Power Control( TPC) and Dynamic Frequency Selection( DSF). Radio access points and WLAN devices that have both functions are allowed to transmit indoors in the lower frequency range of 5.15 GHz and 5.35 GHz with a maximum of 200 mW.

Dynamic Frequency Selection is a type of Adaptive Frequency Agility( AFA) and is also used in DECT, among other things, and is used to find an unoccupied channel that is not being used by a telephone or a radio LAN.

Englisch: dynamic frequency selection (WLAN) - DFS
Updated at: 13.04.2009
#Words: 137
Links: frequency (f), European telecommunications standards institute (ETSI), power (P), equivalent isotropically radiated power (radio transmission) (EIRP), transmit power control (802.11a) (TPC)
Translations: DE

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