# Configuring Speed and Duplex in Microsoft* Windows*

These instructions apply to Microsoft* Windows* 2000, Windows XP, and Windows Server* 2003.

By default, auto-negotiation is enabled. Change this setting only to match your link partner.

1. Navigate to the Device Manager.

2. Open Properties on the adapter you would like to configure.

3. Click the Link tab.

4. Select the appropriate speed and duplex from the Speed and Duplex pull down menu.

5. Click OK.

## Intel® PRO/1000 Adapters Considerations

If auto-negotiation is disabled, the adapter will not operate at gigabit speed (1000 Mbps).

Per the IEEE specification, gigabit speed is available only in full-duplex.

Fiber-based adapters operate only in full duplex, and only at their native speed.

`Last modified on 2/07/05 8:00p Revision 1`