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TXP(4)			 BSD Kernel Interfaces Manual			TXP(4)

     txp -- 3Com 3XP Typhoon/Sidewinder	(3CR990) Ethernet interface

     device txp

     The txp interface provides	access to the 10Mb/s and 100Mb/s Ethernet net-
     works via the 3Com	Typhoon/Sidewinder chipset.  This driver supports the
     following cards:

	   o   3Com 3CR990-TX-95
	   o   3Com 3CR990-TX-97
	   o   3Com 3cR990B-TXM
	   o   3Com 3CR990SVR95
	   o   3Com 3CR990SVR97
	   o   3Com 3cR990B-SRV

     Basic Ethernet functions are provided as well as support for vlan(4) tag
     removal and insertion assistance, receive ip(4), tcp(4), and udp(4)
     checksum offloading, and transmit ip(4) checksum offloading.  There is
     currently no support for transmit tcp(4) or udp(4)	checksum offloading,
     tcp(4) segmentation, nor ipsec(4) acceleration.  Note that	hardware
     checksumming is only used when the	interface is not in bridge(4) mode.

     Each of the host's	network	addresses is specified at boot time with an
     SIOCSIFADDR ioctl(2).  The	txp interface employs the address resolution
     protocol described	in arp(4) to dynamically map between Internet and Eth-
     ernet addresses on	the local network.

     When a txp	interface is brought up, by default, it	will attempt to	auto-
     negotiate the link	speed and duplex mode.	The speeds, in order of	at-
     tempt, are: 100Mb/s Full Duplex, 100Mb/s Half Duplex, 10 Mb/s Full	Du-
     plex, and 10 Mb/s Half Duplex.

     The txp supports several media types, which are selected via the
     ifconfig(8) command.  The supported media types are:

     media autoselect
	     Attempt to	autoselect the media type (default)

     media 100baseTX mediaopt full-duplex
	     Use 100baseTX, full duplex

     media 100baseTX [mediaopt half-duplex]
	     Use 100baseTX, half duplex

     media 10baseT mediaopt full-duplex
	     Use 10baseT, full duplex

     media 10baseT [mediaopt half-duplex]
	     Use 10baseT, half duplex

     arp(4), ifmedia(4), inet(4), intro(4), ip(4), tcp(4), udp(4), vlan(4),

     The txp driver first appeared in OpenBSD 2.9.

BSD				April 15, 2001				   BSD


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