AN(4) Kernel Interfaces Manual AN(4)
an -- Aironet 4500/4800 and Cisco 340/350 series wireless network driver
an* at pcmcia? function ?
an* at pci? dev ? function ?
an* at isapnp?
The an driver provides support for Aironet Communications 4500/4800 and
Cisco Aironet 340/350 series wireless network adapters. This includes
the ISA, PCI and PCMCIA varieties. The 4500 series adapters operate at 1
and 2Mbps while the 4800 series and 340/350 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 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
The PCMCIA Aironet cards require 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 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 to join an access
point with an SSID of null string. For ad-hoc mode, in which stations
can communicate among each other without the aid of an access point, the
driver must be set using ifconfig(8).
For more information on configuring this device, see ifconfig(8) and
Cards supported by the an driver include:
Aironet 4500 Series
Aironet 4800 Series
Cisco Aironet 340 Series
Cisco Aironet 350 Series
an%d: init failed The Aironet card failed to come ready after an
initialization command was issued.
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.
an%d: device timeout The Aironet card failed to generate an interrupt to
acknowledge a transmit command.
arp(4), ifmedia(4), netintro(4), ifconfig(8)
The an device driver first appeared in FreeBSD 4.0, and then in
The an driver was written by Bill Paul <wpaulATee.edu>.
NetBSD 6.1.5 December 13, 2000 NetBSD 6.1.5