Set Up Speed and Duplex

In the default mode, an Intel PRO/100 adapter or PRO/1000 adapter using copper connections will attempt to auto-negotiate with its link partner to determine the best setting. If the adapter cannot establish link with the link partner using auto-negotiation, you may need to manually configure the adapter and link partner to the identical setting to establish link and pass packets. This should only be needed when attempting to link with an older switch that does not support auto-negotiation or one that has been forced to a specific speed or duplex mode.

The settings available when auto-negotiation is disabled are:

CAUTION: Only experienced network administrators should force speed and duplex manually.

Your link partner must match the setting you choose.

NOTE: If an adapter is running at 100 Mbps and half duplex, your potential bandwidth is higher than if you run it at 10 Mbps and full duplex.
NOTE: Per the IEEE specification, gigabit speed and duplex cannot be forced. 
NOTE: You cannot change the speed or duplex of Intel PRO/1000 adapters that use fiber cabling.

Manually Configuring Duplex and Speed Settings

If your switch supports the NWay* standard, and both the adapter and switch are set to auto-negotiate, full duplex configuration is automatic, and no action is required on your part. Not all switches support auto-negotiation. Check with your network system administrator to verify whether your switch supports this feature.

Configuration is specific to the driver you’re loading for your operating system. To set a specific Link Speed and Duplex mode, click the link to the appropriate operating system below.

NOTE: Gigabit speed cannot be forced. It can only be auto-negotiated. 
CAUTION: The settings at the switch must always match the adapter settings. Adapter performance may suffer or your adapter may not operate if you configure the adapter differently from your switch.


Last modified on 7/23/02 10:07a Revision 4