Technical information

Wireless LAN Mode
2-42 AT+i Commands Reference Manual May 31, 2008
Wireless LAN Mode
The W24 includes a Wireless LAN driver for the Marvell 88W8686 802.11b/g WiFi chipset. In
addition, the W24 firmware contains WEP and WPA encryption of WPA-PSK with TKIP and
WPA2-PSK with AES for this chipset.
WPA security requires a parameter that contains the Personal Shared Key (PSK), sometimes
referred to as the passphrase. The Wireless LAN Passphrase (WLPP) parameter is used to set the
passphrase. When passphrase contains a value, W24 uses WPA security when connecting to an
Access Point (AP). Note, however, that for WPA-PSK to be active, an SSID (+iWLSI parameter)
must also be defined. This parameter has precedence over WEP parameters. In other words, when
WLPP contains a value (and WLSI is defined) WPA is used - even if WEP parameters are
defined. The maximum allowable wireless LAN transmission rate is determined by the WLTR
command.
The type of WPA protocol to be used is determined by the value of the WSEC parameter: a '0'
value means the WPA-TKIP protocol will be used, whereas a '1' value specifies the WPA2-AES
protocol.
Several commands, listed below, enable W24 to control the operation of the Marvell WiFi
chipset.
+iWLTR - Wireless LAN Transmission Rate
Syntax: AT+iWLTR=<tr>
Sets the maximum allowable wireless LAN transmission rate.
After a SW reset, WLTR returns to its default value
(54 Mbps).
Parameters:
<tr> tr=0..13
Command Options:
tr=0 Maximum supported transmission rate (54 MBps)
tr=1 Limited to 1 Mbps
tr=2 Limited to 2 Mbps
tr=3 Limited to 5.5 Mbps
tr=4 Limited to 11 Mbps
tr=5 Reserved
tr=6 Limited to 6 Mbps
tr=7 Limited to 9 Mbps
tr=8 Limited to 12 Mbps
tr=9 Limited to 18 Mbps
tr=10 Limited to 24 Mbps
tr=11 Limited to 36 Mbps