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NAME

     rsu — Realtek RTL8188SU/RTL8192SU USB IEEE 802.11b/g/n wireless network device

SYNOPSIS

     To compile this driver into the kernel, place the following lines in your kernel
     configuration file:

           device ehci
           device uhci
           device ohci
           device usb
           device rsu
           device rsufw
           device wlan

     Alternatively, to load the driver as a module at boot time, place the following lines in
     loader.conf(5):

           if_rsu_load="YES"
           rsu-rtl8712fw_load="YES"

DESCRIPTION

     The rsu driver supports USB 2.0 wireless network devices based on Realtek RTL8188SU,
     RTL8191SU and RTL8192SU chipsets.

     The RTL8188SU is a highly integrated 802.11n adapter that combines a MAC, a 1T1R capable
     baseband and an RF in a single chip.  It operates in the 2GHz spectrum only.

     The RTL8191SU is a highly integrated multiple-in, single-out (MISO) 802.11n adapter that
     combines a MAC, a 1T2R capable baseband and an RF in a single chip.  It operates in the 2GHz
     spectrum only.

     The RTL8192SU is a highly integrated multiple-in, multiple-out (MIMO) 802.11n adapter that
     combines a MAC, a 2T2R capable baseband and an RF in a single chip.  It operates in the 2GHz
     spectrum only.

     These are the modes the rsu driver can operate in:

     BSS mode       Also known as infrastructure mode, this is used when associating with an
                    access point, through which all traffic passes.  This mode is the default.

     monitor mode   In this mode the driver is able to receive packets without associating with
                    an access point.  This disables the internal receive filter and enables the
                    card to capture packets from networks which it wouldn't normally have access
                    to, or to scan for access points.

     The rsu driver can be configured to use Wired Equivalent Privacy (WEP) or Wi-Fi Protected
     Access (WPA-PSK and WPA2-PSK).  WPA is the de facto encryption standard for wireless
     networks.  It is strongly recommended that WEP not be used as the sole mechanism to secure
     wireless communication, due to serious weaknesses in it.

     The rsu driver can be configured at runtime with ifconfig(8).

FILES

     /usr/share/doc/legal/realtek.LICENSE  rsu firmware license

     The driver needs at least version 1.2 of the following firmware file, which is loaded when
     an interface is attached:

           /boot/kernel/rsu-rtl8712fw.ko

HARDWARE

     The rsu driver provices support for Realtek RTL8188SU/RTL8192SU USB IEEE 802.11b/g/n
     wireless network adapters, including:

           ASUS USB-N10
           Belkin F7D1101 v1
           D-Link DWA-131 A1
           EDUP EP-MS150N(W)
           Edimax EW-7622UMN
           Hercules HWGUn-54
           Hercules HWNUm-300
           Planex GW-USNano
           Sitecom WL-349 v1
           Sitecom WL-353
           Sweex LW154
           TRENDnet TEW-646UBH
           TRENDnet TEW-648UB
           TRENDnet TEW-649UB

EXAMPLES

     Join an existing BSS network (i.e., connect to an access point):

           ifconfig wlan create wlandev rsu0 inet 192.168.0.20 \
               netmask 0xffffff00

     Join a specific BSS network with network name “my_net”:

           ifconfig wlan create wlandev rsu0 ssid my_net up

     Join a specific BSS network with 64-bit WEP encryption:

           ifconfig wlan create wlandev rsu0 ssid my_net \
                   wepmode on wepkey 0x1234567890 weptxkey 1 up

DIAGNOSTICS

     %s: failed load firmware of file rsu-rtl8712fw  For some reason, the driver was unable to
     read the microcode file from the filesystem.  The file might be missing or corrupted.

     device timeout  A frame dispatched to the hardware for transmission did not complete in
     time.  The driver will reset the hardware.  This should not happen.

SEE ALSO

     intro(1), netintro(4), rsufw(4), usb(4), wlan(4), arp(8), hostapd(8), ifconfig(8),
     wpa_supplicant(8)

HISTORY

     The rsu driver first appeared in OpenBSD 4.9 and FreeBSD 10.0.

AUTHORS

     The rsu driver was written by Damien Bergamini <damien@openbsd.org> and ported by Rui Paulo
     <rpaulo@freebsd.org>.  The 802.11n support was added by Adrian Chadd <adrian@freebsd.org>.

CAVEATS

     The rsu driver currently does not support 802.11n transmit aggregation, either A-MSDU or A-
     MPDU.

     The rsu driver does not capture management frames in non-monitor modes; without this
     limitation some firmware functions (e.g., 'join bss') will not work properly.