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AN(4)			 BSD Kernel Interfaces Manual			 AN(4)

     an	-- Aironet Communications 4500/4800 wireless network adapter driver

     To	compile	this driver into the kernel, place the following lines in your
     kernel configuration file:

	   device an
	   device wlan

     Alternatively, to load the	driver as a module at boot time, place the
     following line in loader.conf(5):


     The an driver provides support for	Aironet	Communications 4500 and	4800
     wireless network adapters and variants, including the following:

	   o   Aironet Communications 4500 and 4800 series
	   o   Cisco Aironet 340 and 350 series
	   o   Xircom Wireless Ethernet	Adapter

     Support for these devices include the ISA,	PCI and	PCMCIA varieties.  The
     Aironet 4500 series adapters operate at 1 and 2Mbps while the Aironet
     4800 series and Cisco adapters 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 do	not require any	PCCARD support.

     The PCMCIA	Aironet	cards require PC Card support, including the kernel
     pccard(4) driver.	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 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.

     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 infrastructure

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

     an%d: init	failed	The Aironet card failed	to become 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.

     altq(4), arp(4), miibus(4), netintro(4), wlan(4), ancontrol(8),

     The an device driver first	appeared in FreeBSD 4.0.

     The an driver was written by Bill Paul <>.

BSD				 July 16, 2005				   BSD


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