HP (Hewlett-Packard) 100BASE-TX ユーザーズマニュアル

Installing and Configuring PCI 10/100 Base-TX

If a PCI 10/100Base-TX/9000 port is connected to a device, such as a
switch, that is autonegotiating, the PCI card will autonegotiate with the
device to mutually determine the highest possible speed and duplex
settings between them.

If a PCI 10/100Base-TX/9000 port is connected to a device that does not
support autonegotiation or a device that has autonegotiation disabled, the
PCI port will autosense the speed of the link and set itself accordingly.
The duplex mode of the card will be set to half-duplex in this
case. If you want the card to operate in full-duplex mode, you have to set
it using the method described in Manual Speed and Duplex Mode
Configuration.

The PCI 10/100Base-TX port will sense when the connection between
itself and a hub or switch on the other end of a link has been broken. If a
connection is made to another (or the same) device, the autonegotiation
and autosensing process will be done again automatically.
Autonegotiation and autosensing are also done whenever the interface is
reset.

The following documents summarize installation, configuration,
verification and troubleshooting of the Dual Port 100Base-TX and Dual
Port Wide Ultra2 SCSI card: