Configuration / project engineering
5.6 Configuration with Web Based Management
SCALANCE W786-xPRO
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Operating Instructions, Release 08/2007, C79000-G8976-C221-02
antenna must be set permanently. The second antenna socket must also have a 50
Ω
terminator fitted.
Note
For information on the location of the antenna sockets, refer to the section "Connectors for
external antennas".
Scan for access points (only for clients and access points in client mode)
While the client is connected to an access point, it scans for other access points in the
background with which it can connect when necessary. There are three modes for scanning
access points that can be selected in the "Background scan mode" drop-down list box.
If you set "Disable", there is no scan for access points while the client is connected.
If you set "Scan if Idle", there is a scan for access points when no data transfer takes place
for a certain time.
If you set "Scan Always", access points are scanned continuously.
The "Background scan interval" parameter specifies the interval at which further access
points are scanned.
To optimize the scanning for further access points, you can specify channels for the client on
which other access points can be found. To allow this, the "Background Scan Ch.Select"
check box must be set and the channels of the other access points entered in the
"Background Scan Channels" text box. Enter the channels separated by blanks.
If the client finds a better access point, it attempts to connect to it. Before it changes, the new
access point must be better than the current access point by a certain value. The threshold
at which the client changes to the new access point can be specified with the "Roaming
threshold" parameter.
Roaming when there is no Ethernet interface (access point mode only)
If the wired Ethernet interface is no longer available (cable break, connector removed), a
client connected over the wireless network is not aware of this. The access point can then
force the logged-on WLAN clients to roam by deactivating its WLAN interface. The client
then attempts to log on at a different access point. You enable this feature by selecting the
"Force roaming if link down on the Ethernet interface" check box.
Enable WMM
With wireless multimedia, multimedia frames are transferred according to the IEEE 802.11e
standard with a higher priority.
Select the Enable WMM option if you want frames evaluated according to their priority and
sent prioritized over the WLAN interface.
According to the Wi-Fi standard, prioritized frames are classified as follows:
Access Category
Description
802.1d Tags
WMM voice priority
Highest priority
Allows multiple concurrent VoIP calls, with low latency
and toll voice quality
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