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
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 sub
- ject to interference from microwaves, IEEE 802.11 wireless network de
- vices, 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 de - vices, by changing 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 allocate enough PC Card bus address space into which to map the
- device. See
pccard(4) and increase memory available to the PC Card con - troller.
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>. - BSD September 5, 2004