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222 AppendixD
PCI 10/100Base-TX/3000 Quick Installation
Notes on Manual Speed and Duplex Mode Configuration
Notes on Manual Speed and Duplex Mode
Configuration
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.