Because this PCI 10/100Base-TX LAN card supports autonegotiation, you should
not normally need to manually set the duplex mode. Sometimes you may need to
manually set the duplex mode of the card — for example, if the switch is
operating at full duplex but does not autonegotiate.
Full-duplex mode is most commonly found in switches rather than hubs. It may be
found in either 10 Mbit/s or 100Mbit/s switch devices. Full-duplex mode may
provide a throughput advantage under some circumstances, but the degree of the
advantage is application-dependent.
The PCI 10/100Base-TX card support both half- and full-duplex operation.
Ensure that the speed, duplex mode, and autonegotiation of the associated
switch are configured the same as in the NMMGR configuration for the PCI
10/100Base-TX card. If the switch supports autonegotiation on the ports
connected to the cards, this should be enabled as explained in "Notes on
Autonegotiation and Autosensing."
To manually set the duplex mode of the PCI card, refer to the link
configuration screen in the active NMCONFIG network configuration file, using
NMMGR to access the configuration data and make changes.
Appendix D PCI 10/100Base-TX/3000 Quick Installation
Complete PDF