Wireless LAN – WLAN
BAT54-Rail/F..
Release
7.54
06/08
3.4
Configuration of WLAN parameters
81
Packet size
Smaller data packets cause fewer transmission errors than larger packets,
although the proportion of header information in the traffic increases, leading
to a drop in the effective network load. Increase the factory value only if your
wireless network is largely free from interference and very few transmission
errors occur. Reduce the value to reduce the occurrence of transmission er-
rors.
Minimum and maximum transmit rate
The access point normally negotiates the data transmission speeds with the
connected WLAN clients continuously and dynamically. In doing this, the ac-
cess point adjusts the transmission speeds to the reception conditions. As an
alternative, you can set fixed values for the minimum and maximum trans-
mission speeds if you wish to prevent the dynamic speed adjustment.
Broadcast rate
The defined broadcast rate should allow the slowest clients to connect to the
WLAN even under poor reception conditions. A higher value should only be
set here if all clients are able to connect "faster".
RTS threshold
The RTS threshold prevents the occurrence of the "hidden station“ phenom-
enon.
Here, the three access points 쐃, 쐇, and 쐋 are positioned such that no direct
wireless connection between the two outer devices is possible. If 쐃 sends a
packet to 쐇, 쐋 is not aware of this as it is outside of 쐃's coverage area. 쐋
may also try, during the transmission from 쐃, to send a packet to 쐇 as well,
because 쐋 has no knowledge of the medium (in this case the wireless con-
nection) being blocked. A collision results and neither of the transmissions
from 쐃 nor 쐋 to 쐇 will be successful. The RTS/CTS protocol is used to pre-
vent collisions.
Network coverage access point 쐋Network coverage access point 쐃
쐃
쐇
쐋
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