NAME
an
—
Aironet Communications 4500/4800
wireless network adapter driver
SYNOPSIS
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):
if_an_load="YES"
DESCRIPTION
Thean
driver provides support for Aironet
Communications 4500 and 4800 wireless network adapters and variants, including
the following:
- Aironet Communications 4500 and 4800 series
- Cisco Aironet 340 and 350 series
Support for these devices include the ISA and PCI 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 and PCI devices are all based on the same core PCMCIA hardware and all have the same programming interface. The ISA and PCI cards appear to the host as normal ISA and PCI devices.
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 operation.
For more information on configuring this device, see ifconfig(8).
DIAGNOSTICS
- an%d: init failed
- The Aironet card failed to become 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.
SEE ALSO
altq(4), arp(4), miibus(4), netintro(4), wlan(4), ancontrol(8), ifconfig(8)
HISTORY
The an
device driver first appeared in
FreeBSD 4.0.
AUTHORS
The an
driver was written by
Bill Paul
<wpaul@ee.columbia.edu>.