User's Manual

Configuration Using Web Based Management and the Command Line Interface
Operation Outdoors
In some countries, there are special wireless channels for data transmission out-
doors. Depending on the country setting you have made, you can select the En-
able 5GHz Outdoor Channels check box to use these wireless channels.
IEEE 802.11b
Select the Enable Basic 11b Mode check box if the SCALANCE W 788 will only
use the transmission rates 1 Mbps and 2 Mbps.
Date Rate
Select a data rate suitable for your application in the Data Rate list box. Restricting
the data rate avoids the additional network load resulting from calculating the best
possible data rate.
Transmit Power
In the Transmit Power list box, you can specify the output power of the
SCALANCE W 788. It may be necessary to reduce the transmit power when using
antennas to avoid exceeding the maximum legal transmit power. Reducing the
transmit power effectively reduces cell size. In some situations, this can have a
positive influence on the transmission quality.
Beacons
Beacons are packets that are sent cyclically by a SCALANCE W 788 to inform cli-
ents of its existence. In the Beacon Interval text box, you specify the interval at
which the SCALANCE W 788 sends beacons.
The DTIM parameter (Delivery Traffic Indication Map) specifies how often the
SCALANCE W 788 sends multicast packets over the wireless interface. If you en-
ter 1 in this box, the SCALANCE W 788 transmits multicast packets directly after
each beacon (recommended setting for normal network environments). The value
5 would mean that the SCALANCE W 788 collects the multicast packets and
sends them after every fifth beacon.
RTS/CTS
RTS/CTS (Ready To Send/Clear To Send) is a method of avoiding collisions
based on an exchange of status information prior to sending the actual data. To
minimize network load resulting from the additional protocol exchange, this method
is used only when a packet size that you select with the RTS/CTS Threshold is ex-
ceeded.
Operating Instructions SCALANCE W 788-1pro / SCALANCE W 788-2pro
80 C79000-G8976-C184-01