Description
2.2 Product properties
SCALANCE W788-xPRO/RR / SCALANCE W74x-1PRO/RR
Operating Instructions (Compact), Release 08/2007, A5E00413342-05
75
Possible applications of the SCALANCE W747-1RR
The SCALANCE W747-1RR provides the same functionality as the SCALANCE W746-
1PRO. The device is also capable of optimized data transfer and handover times in iPCF
mode.
Note
For PNIO communication, we always recommend that you enable the iPCF mode.
Properties of the SCALANCE W788-xx / W74x-1xx
● The Ethernet interface supports 10 Mbps and 100 Mbps, both in full and half duplex as
well as autocrossing and autopolarity.
● Operating the wireless interface in the frequency bands 2.4 GHz and 5 GHz.
● The wireless interface is compatible with the standards IEEE 802.11a,
IEEE 802.11b, and IEEE 802.11g. In the 802.11a- and 802.11g mode, the gross
transmission rate is up to 54 Mbps. In turbo mode, the transmission rate is up to 108
Mbps (not permitted in all countries and modes).
Note
If the SCALANCE W788-xPRO / W788-xRR is operated in turbo mode (A, G or H turbo),
remember that the channels adjacent to the set transmission channel are also used for
communication. Disturbances can therefore occur on these channels when there are
neighboring wireless systems. The data throughput can also be reduced if there is
competition for use of these channels.
● As an expansion of the 802.11a mode, it is also possible to operated according to the
IEEE 802.11h standard. In 802.11h mode, the procedures "Transmit Power Control"
(TPC) and "Dynamic Frequency Selection" (DFS) are used in the range 5.25 - 5.35 and
5.47 - 5.75 GHz. In some countries, this allows the frequency subband of 5.47 -
5.725 GHz to be used outdoors even with a higher transmit power.
TPC is a technique of controlling the transmit power and can reduce it to the strength
actually required. With dynamic frequency selection (DFS), the access point searches for
primary users (for example radar) on a randomly selected channel before starting
communication. If signals are found on the channel, this channel is disabled for 30
minutes and the availability check is repeated on another channel.
The gross transmission rate is up to 54 Mbps in 802.11h mode.
● Support of the authentication standards WPA, WPA-PSK, WPA2, WPA2-PSK and
IEEE 802.1x and the encryption methods WEP, AES and TKIP.
● Suitable for inclusion of a RADIUS server for authentication.
● Device-related and application-related monitoring of the wireless connection.
● The interoperability of the devices with Wi-Fi devices of other vendors was tested
thoroughly.
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