TXP(4)

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

SYNOPSIS
device txp

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

•   3Com 3CR990-TX-95
•   3Com 3CR990-TX-97
•   3Com 3cR990B-TXM
•   3Com 3CR990SVR95
•   3Com 3CR990SVR97
•   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, nor tcp(4) segmentation. 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 Ethernet 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), tcp(4), udp(4), vlan(4), ifconfig(8)

HISTORY
The txp driver first appeared in OpenBSD 2.9.