Wireless LAN – WLAN
82
3.4
Configuration of WLAN parameters
BAT54-Rail/F..
Release
7.54
06/08
To this end, 쐃 precedes the actual transmission by sending an RTS packet
to 쐇, that 쐇 answers with a CTS. The CTS sent by 쐇 is now within "listening
distance" of 쐋, so that 쐋 can wait with its packet for 쐇. The RTS and CTS
signals each contain information about the time required for the transmission
that follows.
A collision between the very short RTS packets is improbable, although the
use of RTS/CTS leads to an increase in overhead. The use of this procedure
is only worthwhile where long data packets are being used and the risk of col-
lision is higher. The RTS threshold is used to define the minimum packet
length for the use of RTS/CTS. The best value can be found using trial and
error tests on location.
Long preamble for 802.11b
Normally, the clients in 802.11b mode negotiate the length of the preamble
with the access point. "Long preamble" should only be set when the clients
require this setting to be fixed.
3.4.6 Additional WLAN functions
Apart from the different encryption methods 802.11i/AES, WPA/TKIP or
WEP and the closed network, a variety of other functions exist for securing
the operation of a wireless network. The Redirect function provides the con-
venient control over the connection of WLAN clients in changing environ-
ments. As this function has significance to other modules of the BAT LCOS,
the configuration parameters are to be found outside of the WLAN settings.
U Redirect function
Clients within wireless networks often have one main aspect in common: a
high degree of mobility. The clients are thus not always connected to the
same access point, but frequently change between access points and the re-
lated LANs.
CTS signal from
, can also be
received by 쐋
RTS signal from 쐃 to 쐇
쐃
쐇
쐋
To Next Page
Loading...
