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.Dd March 23, 2004 .Dt ATU 4 .Os .Sh NAME .Nm atu .Nd Atmel AT76C50x 802.11b wireless network interfaces .Sh SYNOPSIS .Cd "# all architectures" .Cd "atu* at uhub? port ?" .Sh DESCRIPTION The .Nm driver provides support for wireless network adapters based around the Atmel AT76C503, AT76C503A, AT76C505, and AT76C505A USB chipsets and four companion radio chipsets.
p The hardware supports features including 802.11 and 802.3 frames, Wired Equivalent Privacy (WEP), power management, selectable transmission rates, and both BSS and IBSS modes of operation.
p The .Nm driver encapsulates all IP and ARP traffic as 802.11 frames, however it can receive either 802.11 or 802.3 frames.
p The .Nm driver supports Basic Service Set (BSS) operation (also known as infrastructure mode). This mode requires the use of an access point (also known as a base station) to support communication between the adapter and the network.
p The .Nm driver also supports Independent Basic Service Set (IBSS) operation (also known as ad-hoc or point-to-point mode). In IBSS mode stations can communicate amongst themselves without the aid of an access point. Note there are two different modes described as ad-hoc: ad-hoc demo mode, which predates IEEE, is not standardised and does not allow interoperability with cards from other vendors; and IBSS, which is IEEE standardised and permits interoperability. The .Nm driver supports IEEE standardised IBSS operation.
p Wired Equivalent Privacy (WEP) is the de facto encryption standard for wireless networks. It can be typically configured in one of three modes: no encryption; 40-bit encryption; or 128-bit encryption. Unfortunately, due to serious weaknesses in WEP protocol it is strongly recommended that it not be used as the sole mechanism to secure wireless communication. WEP is not enabled by default.
p The following devices are known to be supported by the .Nm driver:
p l -tag -width Ds -offset indent -compact t Tn Acer Peripherals AWL300 t Tn Acer Peripherals AWL400 t Tn Aincomm AWU2000B t Tn Bluetake BW002 t Tn D-Link DWL-120 t Tn Geowave GW-US11S t Tn Linksys WUSB11 t Tn Linksys WUSB11-V28 t Tn Netgear MA101 rev B t Tn Ovislink AirLive WL-1120USB t Tn OvisLink AirLive WL-1130USB t Tn SMC 2662W-AR t Tn SMC 2662W-V4 .El
p The .Nm driver can be configured at runtime with .Xr ifconfig 8 or on boot with .Xr hostname.if 5 using the following parameters: l -tag -width Ds t Cm bssid Ar bssid Set the desired BSSID. t Fl bssid Unset the desired BSSID. The interface will automatically select a BSSID in this mode, which is the default. t Cm chan Ar n Set the channel (radio frequency) to be used by the adapter based on the given channel ID .Ar n . t Fl chan Unset the desired channel to be used by the adapter. The driver will automatically select a channel in this mode, which is the default. t Cm media Ar media The .Nm driver supports the following .Ar media types:
p l -tag -width autoselect -compact t Cm autoselect Enable autoselection of the media type and options. t Cm DS1 Set Direct Spread 1Mbps operation. t Cm DS2 Set Direct Spread 2Mbps operation. t Cm DS5 Set Direct Spread 5.5Mbps operation. t Cm DS11 Set Direct Spread 11Mbps operation. .El t Cm mediaopt Ar opts The .Nm driver supports the following media options: l -tag -width ibss t Cm ibss Select Independant Basic Service Set (IBSS) operation. .El t Fl mediaopt Ar opts Disable the specified media options on the adapter and returns it to the default mode of operation (BSS). t Cm mode Ar mode The .Nm driver supports the following modes: l -tag -width 11b t Cm 11b Force 802.11b operation. .El t Cm nwid Ar id Set the network ID. The .Ar id can either be any text string up to 32 characters in length, or a series of hexadecimal digits up to 64 digits. An empty .Ar id string allows the interface to connect to any available access points. By default the .Nm driver uses an empty string. t Cm nwkey Ar key Enable WEP encryption using the specified .Ar key . The .Ar key can either be a string, a series of hexadecimal digits (preceded by .So 0x Sc ) , or a set of keys of the form .Dq n:k1,k2,k3,k4 , where .Sq n specifies which of the keys will be used for transmitted packets, and the four keys, .Dq k1 through .Dq k4 , are configured as WEP keys. If a set of keys is specified, a comma
q Sq , within the key must be escaped with a backslash. Note that if multiple keys are used, their order must be the same within the network. .Nm is capable of using both 40-bit (5 characters or 10 hexadecimal digits) or 104-bit (13 characters or 26 hexadecimal digits) keys. t Fl nwkey Disable WEP encryption. This is the default mode of operation. .El .Sh FILES The adapter needs some firmware files, which are loaded on demand by the driver when the device is attached:
p l -tag -width Ds -offset indent -compact t Pa /etc/firmware/atu-intersil-int t Pa /etc/firmware/atu-intersil-ext t Pa /etc/firmware/atu-rfmd-int t Pa /etc/firmware/atu-rfmd-ext t Pa /etc/firmware/atu-rfmd2958-int t Pa /etc/firmware/atu-rfmd2958-ext t Pa /etc/firmware/atu-rfmd2958smc-int t Pa /etc/firmware/atu-rfmd2958smc-ext .El .Sh SEE ALSO .Xr arp 4 , .Xr ifmedia 4 , .Xr intro 4 , .Xr netintro 4 , .Xr usb 4 , .Xr hostname.if 5 , .Xr ifconfig 8 .Sh AUTHORS The .Nm driver was written by .An Daan Vreeken and ported to .Ox by .An Theo de Raadt and David Gwynne . .Sh CAVEATS The .Nm driver does not support a lot of the functionality available in the hardware. More work is required to properly support the WEP, IBSS, power management and selectable transmission rate features.