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CNW(4)			     Kernel Interfaces Manual			  CNW(4)

NAME
     cnw -- Netwave AirSurfer wireless network driver

SYNOPSIS
     device cnw

DESCRIPTION
     The  cnw interface provides access to a theoretical 1Mb/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 supported  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 frequency,
     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  in-
     crease memory space available to the PC Card controller.  See pccard(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 interfer-
     ence  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  PC  Card  bus  address space into which to map the device.  See pc-
     card(4) and increase memory available to the PC Card controller.

SEE ALSO
     arp(4), awi(4), inet(4), intro(4), pccard(4)

HISTORY
     The cnw driver was ported from NetBSD by Hiroyuki Aizu  <aizu@jaist.ac.jp>.
     It  first	appeared in NetBSD 1.4.  The first FreeBSD release to include it
     was FreeBSD 5.0.  This manual page was adopted  from  NetBSD  by  Christian
     Brueffer <brueffer@FreeBSD.org>.

FreeBSD 7.4			September 5, 2004			  CNW(4)
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