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     otus — Atheros AR9170 USB IEEE 802.11a/b/g/n wireless network device


     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 otus
           device wlan

     Alternatively, to load the driver as a module at boot time, place the following line in



     The otus driver supports USB 2.0 wireless network devices based on the Atheros AR9170

     The Atheros AR9170 is a draft-802.11n adapter that uses an external radio to operate in
     either 2.4GHz only or 2.4GHz and 5GHz.

     The AR9101 radio supports 1T1R operation in 2GHz only.

     The AR9102 radio supports 2T2R operation in 2GHz only.

     The AR9104 radio supports 2T2R operation both 2GHz and 5GHz.

     These are the modes the otus 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 otus 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 otus driver can be configured at runtime with ifconfig(8).


     The driver needs at least version 1.0 of the following firmware files, which is loaded when
     an interface is attached:



     The otus driver provices support for Atheros AR9170 USB IEEE 802.11b/g/n wireless network
     adapters, including:

           3Com 3CRUSBN275
           Arcadyan WN7512
           CACE AirPcap Nx
           D-Link DWA-130 rev D1
           D-Link DWA-160 rev A1
           D-Link DWA-160 rev A2
           IO-Data WN-GDN/US2
           NEC Aterm WL300NU-G
           Netgear WNDA3100
           Netgear WN111 v2
           Planex GW-US300
           SMC Networks SMCWUSB-N2
           TP-Link TL-WN821N v1, v2
           Ubiquiti SR71 USB
           Unex DNUA-81
           Z-Com UB81
           Z-Com UB82
           ZyXEL NWD-271N


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

           ifconfig wlan create wlandev otus0 inet \
               netmask 0xffffff00

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

           ifconfig wlan create wlandev otus0 ssid my_net up

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

           ifconfig wlan create wlandev otus0 ssid my_net \
                   wepmode on wepkey 0x1234567890 weptxkey 1 up


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


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


     The otus driver first appeared in OpenBSD 4.6.


     The otus driver was written by Damien Bergamini <> and ported by Adrian
     Chadd <>.


     The otus driver only supports 802.11a/b/g operations.  802.11n operation is not supported at
     this time.