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$FreeBSD: head/share/man/man4/an.4 56460 2000-01-23 15:04:20Z asmodai $
.Dd September 10, 1999 .Dt AN 4 i386 .Os FreeBSD .Sh NAME .Nm an .Nd Aironet Communications 4500/4800 wireless network adapter driver .Sh SYNOPSIS .Cd "device an" .Cd "device an0 at isa? port 0x140 irq 5" .Sh DESCRIPTION The .Nm driver provides support for Aironet Communications 4500 and 4800 wireless network adapters. This includes the ISA, PCI and PCMCIA varieties. 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 no not require any PCCARD support.
p The PCMCIA Aironet cards require pccard support, including the kernel pccard driver support and the .Xr 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 .Nm 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.
p 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 .Nm 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).
p By default, the .Nm driver configures the Aironet card for ad-hoc operation with an SSID of "ANY." In this mode, stations can communicate among each other without the aid of an access point. To join a service set, the driver must be set for BSS mode using the .Xr ancontrol 8 utility.
p For more information on configuring this device, see .Xr ifconfig 8 .Sh DIAGNOSTICS l -diag t "an%d: init failed" The Aironet card failed to come ready after an initialization command was issued. t "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. t "an%d: device timeout" The Aironet card failed to generate an interrupt to acknowledge a transmit command. .El .Sh SEE ALSO .Xr arp 4 , .Xr netintro 4 , .Xr ifconfig 8 , .Xr ancontrol 8 .Sh HISTORY The .Nm device driver first appeared in .Fx 4.0 . .Sh AUTHOR The .Nm driver was written by .An Bill Paul Aq wpaul@ee.columbia.edu .