# Quality of Service (QoS)

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.

To implement QoS, the adapter must be connected to a switch that supports and is configured for 802.1p QoS.

Tagging is enabled and disabled using the "QoS Packet Tagging" field in the Advanced tab in the Device Manager.

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

Microsoft* Windows 2000 has its own utility for 802.1p packet prioritization. For more information on the Windows 2000 utility, see the Windows 2000 system help. Use the Index tab and search for the term "QoS." Select the "Windows 2000 Administration Tools" topic.

Additional information is available at the QoS WMI Provider page.

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

`Last modified on 3/03/04 3:04p Revision 3`