
Configuration Using Web Based Management and the Command Line Interface
Operating Instructions SCALANCE W 744-1PRO
C79000-G8976-C185-03
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5.3.5 Advanced G Submenu
Properties of the 802.11g Standard
The IEEE 802.11g is upwards compatible with IEEE 802.11b, both use the 2.4
GHz band. In contrast to 802.11b that specifies data rates up to 11 Mbps, 802.11g
provides for data rates up to 54 Mbps. The 802.11g standard also uses the OFDM
modulation scheme.
Special Options for 802.11g Settings
The options you can set in the Advanced G submenu relate to the way in which
management and control data (RTS/CTS frames, beacons) are sent in the 802.11g
mode. You can also specify that the SCALANCE W744 only supports 802.11g-
compatible devices.
Handling 802.11b Clients
The access point automatically detects whether 802.11b clients exist in the envi-
ronment. To avoid 802.11g packets colliding with 802.11b packets, the access
point can use the RTS/CTS method.
With the 802.11g CTS Mode list box, you specify the use of RTS/CTS (only in the
access point mode).
0 do not use RTS/CTS.
1 always use RTS/CTS with 802.11g packets.
2 only use RTS/CTS when there are 802.11b clients in environment.
You can set the data rate for RTS/CTS frames in the 802.11g CTS Rate list box.
With the 802.11g CTS Type list box, you specify whether a CTS or RTS/CTS is
sent.
802.11g Expansions
With the 802.11g Short Slot Time parameter, you specify whether or not the short
slot time is used. This short slot time should be supported by all
newer clients.
The 802.11g Basic Rate list box specifies the minimum data rate that must be sup-
ported by clients before they can connect to the access point (only in the access
point mode).
With the 802.11g Only Mode parameter, you can specify that only 802.11g clients
can log on at the access point and also that only 802.11g rates are permitted (only
in the access point mode).
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