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):
DESCRIPTION¶
The
an 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
- 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
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⟩.