XAV5501 Powerline AV+ 500 Adapter User Manual
By default, all types of traffic on the Powerline network are assigned the same priority. For most applications, this works fine. However, there are situations where performance improves if you assign a higher priority to certain types of traffic, such as multimedia files.
To prioritize by general application type:
If your network traffic is a mix of multimedia and document/database traffic you might want to give priority to a particular traffic type. If it is important that your multimedia playback is smooth, even while document files are being transferred over the network, then give priority to multimedia traffic. Conversely, if it is more important for your network to be responsive to database applications, give priority to this type of application over multimedia applications.
The Powerline AV Ethernet Adapter supports the following:
•MAC address
•IP port
•VLAN tags
•ToS bits (Type of Service routing)
To set the priority of data transfers by the type of protocol:
1.Start the XAV5501 Powerline Utility and wait for the utility to detect the Powerline AV Ethernet Adapters connected to the network.
You can go to the QoS screen from either the Security icon 
menu or the Powerline device
2.From the