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
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