an(4), it figures

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+.\" Copyright (c) 1997, 1998, 1999
+.\"    Bill Paul <wpaul@ee.columbia.edu>. All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"    This product includes software developed by Bill Paul.
+.\" 4. Neither the name of the author nor the names of any co-contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"   without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+.\" THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD: src/share/man/man4/an.4,v 1.5 2000/03/02 14:53:45 sheldonh Exp $
+.\"
+.Dd September 10, 1999
+.Dt AN 4 i386
+.Os FreeBSD
+.Sh NAME
+.Nm an
+.Nd
+Aironet Communications 4500/4800 wireless network adapter driver
+.Sh SYNOPSIS
+.Cd "device an"
+.Cd "device an0 at isa? port 0x140 irq 5"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for Aironet Communications 4500 and 4800
+wireless network adapters.
+This includes the ISA, PCI and PCMCIA
+varieties.
+The 4500 series adapters operate at 1 and 2Mbps while
+the 4800 series can operate at 1, 2, 5.5 and 11Mbps.
+The ISA, PCI
+and PCMCIA devices are all based on the same core PCMCIA modules
+and all have the same programming interface, however unlike the
+Lucent WaveLAN/IEEE cards, the ISA and PCI cards appear to the
+host as normal ISA and PCI devices and no not require any PCCARD
+support.
+.Pp
+The PCMCIA Aironet cards require pccard support, including the
+kernel pccard driver support and the
+.Xr pccardd 8
+daemon.
+ISA cards can either be configured to use ISA Plug and Play
+or to use a particular I/O address and IRQ
+by properly setting the DIP switches on the board.
+(The default
+switch setting is for plug and play.)
+The
+.Nm
+driver has Plug and Play support and will work in either configuration,
+however when using a hard-wired I/O address and IRQ, the driver
+configuration and the NIC's switch settings must agree.
+PCI cards
+require no switch settings of any kind and will be automatically
+probed and attached.
+.Pp
+All host/device interaction with the Aironet cards is via programmed I/O.
+The Aironet devices support 802.11 and 802.3 frames, power management,
+BSS (infrastructure) and IBSS (ad-hoc) operation modes.
+The
+.Nm
+driver encapsulates all IP and ARP traffic as 802.11 frames, however
+it can receive either 802.11 or 802.3 frames.
+Transmit speed is
+selectable between 1Mbps, 2Mbps, 5.5Mbps, 11Mbps or
+"auto" (the NIC automatically chooses the best speed).
+.Pp
+By default, the
+.Nm
+driver configures the Aironet card for ad-hoc operation with an SSID
+of "ANY."
+In this mode,
+stations can communicate among each other without the aid of an access
+point.
+To join a service set, the driver must be set for BSS mode using
+the
+.Xr ancontrol 8
+utility.
+.Pp
+For more information on configuring this device, see
+.Xr ifconfig 8
+.Sh DIAGNOSTICS
+.Bl -diag
+.It "an%d: init failed"
+The Aironet card failed to come ready after an initialization command was
+issued.
+.It "an%d: failed to allocate %d bytes on NIC"
+The driver was unable to allocate memory for transmit frames in the
+NIC's on-board RAM.
+.It "an%d: device timeout"
+The Aironet card failed to generate an interrupt to acknowledge a transmit
+command.
+.El
+.Sh SEE ALSO
+.Xr arp 4 ,
+.Xr netintro 4 , 
+.Xr ifconfig 8 ,
+.Xr ancontrol 8
+.Sh HISTORY
+The
+.Nm
+device driver first appeared in
+.Fx 4.0 .
+.Sh AUTHOR
+The
+.Nm
+driver was written by
+.An Bill Paul Aq wpaul@ee.columbia.edu .