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cnw(4) [netbsd man page]

CNW(4)							   BSD Kernel Interfaces Manual 						    CNW(4)

cnw -- Netwave AirSurfer wireless network driver SYNOPSIS
cnw* at pcmcia? function ? DESCRIPTION
The cnw interface provides access to a theoretical 1 Mb/s wireless Ethernet network based on the Netwave AirSurfer Wireless LAN (formerly known as the Xircom Netwave Wireless LAN). Note that the driver does not support newer devices such as the Netwave AirSurfer ``Plus'', or the BayStack 650/660. These devices are sup- ported by the awi(4) driver. Netwave devices are not compatible with IEEE 802.11 wireless networks. Also note that there are Netwave devices with different wireless fre- quency, depending on the radio band plan in each country. The card uses 36K of I/O memory mapped to the card. You may need to increase memory space available to the PCMCIA controller. See pcmcia(4) for details. In use, the cards appear to achieve up to a 420Kb/s transfer rate, though a transfer rate between 250Kb/s and 350Kb/s is typical. The card operates in the 2.4GHz frequency range and is subject to interference from microwaves, IEEE 802.11 wireless network devices, as well as earth. For example, it seems that IEEE 802.11 channel 14 conflicts with Netwave (US frequency). They interfere with each other if they are both operated in the same geographic region, causing weird packet loss. You may be able to avoid the interference with IEEE 802.11 devices, by changing the IEEE 802.11 channel. HARDWARE
Cards supported by the cnw driver include: Xircom CreditCard Netwave NetWave AirSurfer DIAGNOSTICS
cnw0: can't map memory Indicates that the driver was not able to allocate enough PCMCIA bus address space into which to map the device. See pcmcia(4) and increase memory available to the PCMCIA controller. SEE ALSO
arp(4), awi(4), inet(4), intro(4), pcmcia(4), cnwctl(8) BSD
January 5, 1997 BSD

Check Out this Related Man Page

AN(4)							   BSD Kernel Interfaces Manual 						     AN(4)

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 following: 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 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 manage- ment, 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 automati- cally 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 <>. BSD
July 16, 2005 BSD
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