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DFS


This page explains the DFS (Dynamic Frequency Selection) function.


SX-ND-4350WAN Plus supports DFS (Dynamic Frequency Selection) of the IEEE 802.11h wireless standard. When radar signals are detected, the channel will automatically be switched to avoid interference with radar systems (e.g. weather radar, etc).

One alternative channel can individually be set for W53/W56 channels beforehand, which will be used when radar signals are detected and the channel needs to be switched. When alternative channels are not specified or radar signals are detected even for that channel, SX-ND-4350WAN Plus switches the channel in order of the following:

DFS Channels (5GHz band)

W53 HT20 52 > 56 > 60 > 64 > 36
HT40
+
52 > 60 > 36
-
56 > 64 > 40
W56
HT20
100 > 104 > 108 > 112 > 116 > 120 > 124 > 128 > 132 > 136 > 140 > 100
HT40
+
100 > 108 > 116 > 124 > 132 > 100
-
104 > 112 > 120 > 128 > 136 > 104

  • SX-ND-4350WAN Plus checks if there are radar signals on the DFS channels when it is powered on. During this time, no wireless communication is allowed to SX-ND-4350WAN Plus.
  • If radar signals are detected during or after SX-ND-4350WAN Plus is powered on, the channel needs to be changed in order to avoid wireless interference. Therefore, if DFS channels are selected, the channel could be changed automatically.
  • The radar signals are monitored for a certain amount of time (*) after it is detected, while wireless communication is disabled on SX-ND-4350WAN Plus then. Once radar signals are detected, the channel will not be available for 30 mins. (* This time period differs depending on the country.)


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