# Quality of Service

Quality of Service (QoS) allows the adapter to send and receive IEEE 802.3ac tagged frames. 802.3ac tagged frames include 802.1p priority-tagged frames and 802.1Q VLAN-tagged frames. In order to implement QoS, the adapter must be connected to a switch that supports and is configured for QoS. Priority-tagged frames allow programs that deal with real-time events to make the most efficient use of network bandwidth. High priority packets are processed before lower priority packets. Microsoft* Windows* 2000, Windows XP, Windows Vista*, Windows Server* 2003, and Windows Server 2008 support QoS.

Under Windows 2000, Windows XP, and Windows Server 2003, tagging is enabled and disabled using the "QoS Packet Tagging" setting in the Advanced tab in Intel® PROSet. Under Windows Vista and Windows Server 2008, tagging is enabled using the "Priority/VLAN Tagging" setting on the Advanced tab.

Once QoS is enabled in Intel PROSet, you can specify levels of priority based on IEEE 802.1p/802.1Q frame tagging.

The supported operating systems have a utility for 802.1p packet prioritization. For more information, see the Windows system help and Microsoft's knowledge base.

| NOTE: The first generation Intel® PRO/1000 Gigabit Server Adapter (PWLA 8490) does not support QoS frame tagging.

`Last modified on 12/11/07 4:13p Revision 6`