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PGT(4)                   BSD Kernel Interfaces Manual                   PGT(4)

     pgt -- Conexant/Intersil Prism GT Full-MAC IEEE 802.11a/b/g wireless net-
     work device

     pgt* at cardbus?
     pgt* at pci?

     The pgt driver provides support for Conexant/Intersil GT-series devices
     which can support the Full-Mac firmware, using the ISL3877, ISL3880, and
     ISL3890 chips.  The pgt driver will not (yet) work on similar devices
     using the ISL3886 or similar chips which use the Soft-Mac firmware.

     These are the modes the pgt driver can operate in:

     BSS mode       Also known as infrastructure mode, this is used when asso-
                    ciating with an access point, through which all traffic
                    passes.  This mode is the default.

     IBSS mode      Also known as IEEE ad-hoc mode or peer-to-peer mode.  This
                    is the standardized method of operating without an access
                    point.  Stations associate with a service set.  However,
                    actual connections between stations are peer-to-peer.

     Host AP        In this mode the driver acts as an access point (base sta-
                    tion) for other cards.

     monitor mode   In this mode the driver is able to receive packets without
                    associating with an access point.  This disables the
                    internal receive filter and enables the card to capture
                    packets from networks which it wouldn't normally have
                    access to, or to scan for access points.

     The pgt driver can be configured to use hardware Wired Equivalent Privacy
     (WEP).  It is strongly recommended that WEP not be used as the sole mech-
     anism to secure wireless communication, due to serious weaknesses in it.

     The pgt driver can be configured at runtime with ifconfig(8) or on boot
     with hostname.if(5).

     The driver needs a set of firmware files which are loaded when an inter-
     face is brought up:


     These firmware files are not free because Conexant refuses to grant dis-
     tribution rights.  In fact they have rebuffed thousands of attempts to
     start a dialogue on this issue.  As a result, even though OpenBSD
     includes the driver, the firmware files cannot be included and users have
     to download these files on their own.

     A prepackaged version of the firmware can be installed using

     The following cards are among those supported by the pgt driver:

           Card                                      Chip       Bus
           3COM 3CRWE154G72                          ISL3880    CardBus
           D-Link DWL-g650 A1                        ISL3890    PCI
           I-O Data WN-G54/CB                        ISL3890    PCI
           I4 Z-Com XG-600                           ISL3890    PCI
           I4 Z-Com XG-900                           ISL3890    PCI
           Intersil PRISM Indigo                     ISL3877    PCI
           Intersil PRISM Duette                     ISL3890    PCI
           NETGEAR WG511 (Taiwanese, not Chinese)    ISL3890    CardBus
           PLANEX GW-DS54G                           ISL3890    PCI
           SMC EZ Connect g 2.4GHz SMC2802W          ISL3890    PCI
           SMC EZ Connect g 2.4GHz SMC2835W-v2       ISL3890    CardBus
           SMC 2802Wv2                               ISL3890    PCI
           Soyo Aerielink                            ISL3890    CardBus
           ZyXEL ZyAIR G-100                         ISL3890    CardBus

     The following example scans for available networks:

           # ifconfig pgt0 scan

     The following hostname.if(5) example configures pgt0 to join network
     ``mynwid'', using WEP key ``mywepkey'', obtaining an IP address using

           nwid mynwid
           nwkey mywepkey

     The following hostname.if(5) example creates a host-based access point on

           mediaopt hostap
           nwid mynwid
           nwkey mywepkey

     arp(4), cardbus(4), ifmedia(4), intro(4), netintro(4), pci(4),
     hostname.if(5), hostapd(8), ifconfig(8)

     The pgt driver first appeared in OpenBSD 4.0.

     The pgt driver was originally written for FreeBSD by Brian Fundakowski,
     and then rewritten for OpenBSD by Marcus Glocker and Claudio Jeker.

     Host AP mode doesn't support power saving.  Clients attempting to use
     power saving mode may experience significant packet loss (disabling power
     saving on the client will fix this).

BSD                             April 16, 2013                             BSD