an(4)

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

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

+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 automati
cally 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, howev
er it can
receive either 802.11 or 802.3 frames. Transmit speed is
selectable
between 1Mbps, 2Mbps, 5.5Mbps, 11Mbps or "auto" (the NIC au
tomatically
chooses the best speed).
By default, the an driver configures the Aironet card for
infrastructure
operation.
For more information on configuring this device, see ifcon
fig(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 un
able 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

arp(4), miibus(4), netintro(4), wlan(4), ancontrol(8), if
config(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>.
BSD July 16, 2005
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