This Recommendation addresses Ethernet quality of service (QoS) control for next generation networks. It specifies the following:

• Service definitions and general requirements for Ethernet-based NGNs.

• Reference model of QoS architecture for Ethernet-based NGNs.

• Traffic management mechanisms for Ethernet-based NGNs.

• Operation, administration and maintenance (OAM) mechanisms for Ethernet-based NGNs.

• Protection and restoration mechanisms for Ethernet-based NGNs.

The OAM and protection and restoration mechanisms are specified by reference to other Recommendations.

Ethernet-based NGN is broadly characterized as the employment of IP protocols for the control of Ethernet data flows. In the data link layer, data link features and interfaces defined in [b-IEEE 802.3] will not be altered.

As considered in this Recommendation, the Ethernet network encompasses not only the customer's local network but also the operator's access and core networks, which are assumed to employ Ethernet technology.