Autonegotiation And Auto-Sensing - HP -UX 11i Installation And Update Manual

Configuring Built-In PCI Networking

Autonegotiation and Auto-sensing

Autonegotiation and Auto-sensing
Autonegotiation enables devices sharing a link segment to operate at the
optimal mode: 10Base-T or 100Base-TX and half- or full-duplex modes.
If the PCI 10/100Base-TX/9000 card 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.
The fiber card (100Base-FX/9000) does not support autonegotiation.
NOTE If the PCI 10/100Base-TX/9000 card is connected to a device that does
not support autonegotiation or a device that has autonegotiation disabled,
the PCI card will autosense the speed of the link and set itself accordingly.
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 previously in "Manual Speed and Duplex Mode Configuration."
The PCI 10/100Base-TX card 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 autosensing
process will be done again automatically. Autosensing is also done
whenever the interface is reset.
Appendix C 139