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

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

SYNOPSIS
     txp* at pci? dev ? function ?

DESCRIPTION
     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:

	   ·   3Com 3CR990-TX-95
	   ·   3Com 3CR990-TX-97
	   ·   3Com 3CR990SVR95
	   ·   3Com 3CR990SVR97

     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
     attempt, are: 100Mb/s Full Duplex, 100Mb/s Half Duplex, 10 Mb/s Full
     Duplex, 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

SEE ALSO
     arp(4), ifmedia(4), inet(4), intro(4), ip(4), netintro(4), pci(4),
     tcp(4), udp(4), vlan(4), ifconfig(8)

HISTORY
     The txp driver first appeared in NetBSD 2.0.

BSD				August 21, 2003				   BSD

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