# Configuring Speed and Duplex in Windows*

These instructions apply to Windows 98, Windows NT*, Windows 2000, Windows XP, and Windows Server 2003.

The methods used to configure Intel® PRO/100 and PRO/1000 adapters differ slightly. See the section specific to your adapter for configuration instructions.

- Intel PRO/100 Adapters

- Intel PRO/1000 Adapters

## Configuring Intel PRO/100 Adapters

The default setting is for auto-negotiation to be enabled. Change this setting only to match the link partner.

## Configuring Intel PRO/1000 adapters

The default setting is for auto-negotiation to be enabled.

For Intel PRO/1000 fiber adapters, auto-negotiation is the only speed. For other Intel PRO/1000 adapters, change this setting only if you are encountering problems linking to a link partner. In this case, change the settings to match the link partner.

| NOTE: The adapter will not operate at gigabit speed (1000 Mbps) if you disable auto-negotiation.
| NOTE: You cannot change the speed or duplex of Intel PRO/1000 adapters that use fiber cabling.

If Auto Negotiation is disabled, you can specify Forced Speed (to 10 or 100 Mbps, but not 1000 Mbps) and Duplex. In this situation, the Negotiable Speeds and Duplexes checkboxes are disabled, since these are set to advertise speeds during auto-negotiation.

If Auto Negotiation is enabled, the Negotiable Speeds and Duplexes checkboxes are enabled, allowing specific speed advertisement and disabling the Forced Speed and Duplex selection buttons.

`Last modified on 5/06/04 10:51a Revision 5`