AN(4)                     OpenBSD Programmer's Manual                    AN(4)

NAME
     an - Aironet Communications 4500/4800 IEEE 802.11DS wireless network
     adapter

SYNOPSIS
     an* at pcmcia? function ?
     an* at pci? dev ? function ?

DESCRIPTION
     The an driver provides support for the Aironet Communications 4500, 4800
     (aka Cisco 340), and Cisco 350 IEEE 802.11 Direct Sequence wireless net-
     work adapters.  This includes the ISA, PCI, and PCMCIA varieties.  The
     4500 series adapters operate at 1 and 2Mbps while the 4800 and 350 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 pro-
     gramming interface.  However, unlike the Lucent WaveLAN/IEEE cards, the
     ISA and PCI cards appear to the host as normal ISA and PCI devices and do
     not require any pcmcia support.

     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 an
     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 configu-
     ration and the NIC's switch settings must agree.  PCI cards require no
     switch settings of any kind and will be automatically probed and at-
     tached.

     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 an driver
     encapsulates all IP and ARP traffic as 802.11 frames, however, it can re-
     ceive either 802.11 or 802.3 frames.  Transmit speed is selectable be-
     tween 1Mbps, 2Mbps, 5.5Mbps, 11Mbps or "auto" (the NIC automatically
     chooses the best speed).

     By default, the an driver configures the Aironet card for BSS operation
     with an SSID of "".  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 ancontrol(8) utility.

     For more information on configuring this device, see ifconfig(8).

DIAGNOSTICS
     an%d: init failed  The Aironet card failed to come ready after an ini-
     tialization command was issued.

     an%d: failed to allocate %d bytes on NIC  The driver was unable to allo-
     cate memory for transmit frames in the NIC's on-board RAM.

     an%d: device timeout  The Aironet card failed to generate an interrupt to
     acknowledge a transmit command.

SEE ALSO
     arp(4), netintro(4), wi(4), ancontrol(8), ifconfig(8)

HISTORY
     The an device driver first appeared in FreeBSD 4.0. OpenBSD support was
     added in OpenBSD 2.7.

AUTHORS
     The an driver was written by Bill Paul <wpaul@ee.columbia.edu> and ported
     to OpenBSD by Michael Shalayeff <mickey@openbsd.org>.

OpenBSD 3.0                   September 10, 1999                             1
