RSU(4)

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

SYNOPSIS
rsu* at uhub? port ?

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.

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 current 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) or on boot with hostname.if(5).

FILES
The driver needs at least version 1.1 of the following firmware file, which is loaded when an interface is attached:

/etc/firmware/rsu-rtl8712fw

A prepackaged version of the firmware can be installed using fw_update(1).

HARDWARE
The following adapters should work:

ASUS USB-N10
ASUS WL-167G V3
Belkin F7D1101 v1
D-Link DWA-131 A1
Hercules HWGUn-54
Hercules HWNUm-300
Planex GW-USNano
Sitecom WL-349 v1
Sitecom WL-353
Sweex LW154
TRENDnet TEW-648UB
TRENDnet TEW-649UB

EXAMPLES
The following example scans for available networks:

    # ifconfig rsu0 scan

The following hostname.if(5) example configures rsu0 to join network “mynwid”, using WPA key “mywpakey”, obtaining an IP address using DHCP:

    nwid mynwid
    wpakey mywpakey
    dhcp

DIAGNOSTICS

rsu0: error N, could not read firmware ... For some reason, the driver was unable to read the microcode file from the filesystem. The file might be missing or corrupted.

rsu0: 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
arp(4), ifmedia(4), intro(4), netintro(4), usb(4), hostname.if(5), ifconfig(8)

HISTORY
The rsu driver first appeared in OpenBSD 4.9.

AUTHORS
The rsu driver was written by Damien Bergamini <damien.bergamini@free.fr>.

CAVEATS
The rsu driver does not support any of the 802.11n capabilities offered by the adapters. Additional work is required in ieee80211(9) before those features can be supported.