Siemens SIMATIC NET SCALANCE W780 Series Configuration Manual page 278

Configuring with Web Based Management
6.6 "Interfaces" menu
● Multi Radar Detection (only in access point mode)
– Enabled
– Disabled
● Prefer Configured DFS Channel (only in access point mode)
– Enabled
– Disabled
Procedure
1. Enter the values to be set in the input boxes as follows.
2. Select the option checkmark of the required functions.
3. Click the "Set Values" button.
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This function is only available if you have enabled the "DFS" function on the "Basic"
page.
This function is suitable for systems with several access points connected via an
Ethernet network and that send on the same channel.
When an access point detects a radar signal it distributes this information to all
connected access points. If at least one further access point verifies the radar signal
within 40 ms, all connected access points are informed. All the devices sending on this
channel change to a different channel. The channel is blocked for 30 minutes for their
access points in the network.
If you have configured "Auto" for the channel on the "Interfaces > WLAN > AP" page,
the function cannot be used reliably. In this case the verification of the radar signals is
only possible when at least two connected access points happen to transmit on the
same channel. If only one access point detects a signal on a channel, it treats this as
a valid radar signal.
The function is not used. When an access point detects a radar signal it changes to
another channel.. The configured channel is no longer taken into account.
This function is only available if you have enabled the "DFS" function on the "Basic"
page.
If the configured channel of a WLAN interface was blocked due to radar detection and
is released again after 30 minutes the access point changes automatically to the
configured channel.
Before the access point starts the communication on the configured channel it
searches 60 seconds for primary users on the channel. During this time the access
point does not send beacons. If signals are found on the channel, the access point
changes channel and repeats the check. Only when no signals from primary users are
detected after 60 seconds does the access point send on the channel.
If you have configured "Auto" for the channel on the "Interfaces > WLAN > AP" page,
the device does not have a configured channel to which it can return.
The function is not used.
SCALANCE W780/W740 to IEEE 802.11n Web Based Management
Configuration Manual, 08/2018, C79000-G8976-C267-13