FreeBSD Man Pages

cnw(4)

NAME

     cnw -- Netwave AirSurfer wireless network driver

SYNOPSIS

     device cnw

DESCRIPTION

     The cnw interface provides access to a theoretical 1Mb/s wireless Ether-
     net 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 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 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 inter-
     ference 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 chang-
     ing the IEEE 802.11 channel.

HARDWARE

     Cards supported by the cnw driver include:

     o	 Xircom CreditCard Netwave
     o	 NetWave AirSurfer

DIAGNOSTICS

     cnw0: can't map memory  Indicates that the driver was not able to allo-
     cate enough PC Card bus address space into which to map the device.  See
     pccard(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 5.4		       September 5, 2004		   FreeBSD 5.4

SPONSORED LINKS