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AN(4)		       FreeBSD Kernel Interfaces Manual			 AN(4)

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

     device an
     device an0	at isa?	port 0x140 irq 5

     The an driver provides support for	Aironet	Communications 4500 and	4800
     wireless network adapters.	 This includes the ISA,	PCI and	PCMCIA vari-
     eties.  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 do not	require	any PCCARD support.

     The PCMCIA	Aironet	cards require pccard support, including	the kernel
     pccard driver support and the 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	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
     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).

     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 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.

     arp(4), miibus(4),	netintro(4), ancontrol(8), ifconfig(8)

     The an device driver first	appeared in FreeBSD 4.0.

     The an driver was written by Bill Paul <>.

FreeBSD	4.8		      September	10, 1999		   FreeBSD 4.8


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