电信级以太网业务及技术

电信级以太网（CE）泛指运营商基于以太网技术向用户提供标准化的具有良好可扩展性、可靠性、可管理性和服务质量（QoS）保证的电信级传送业务，其重要特征是实现技术的多样性。增强以太网技术以提高可扩展性为其首要目标，扩展传统以太网桥技术的最新的PBB一话务工程（PBT）代表了CE的技术发展方向。多协议标记交换（MPLS）技术基于标记交换路径为CE提供可靠的伪线连接，它和运营商骨干网桥（PBB）技术的结合是CE演进的重要方向之一。光环网技术充分利用已有的光传输网络基础设施，是CE最为经济有效的实现方法。未来发展方向是在保持简单性和经济性的基础上着力加强操作、管理、维护（OAM）功能和控制平面功能。

Carrier Ethernet Services and Technologies

Carrier Ethernet(CE) is an inclusive term standing for any operator provided and Ethernet technology based standardized carrier grade transport services with good scalability,reliability,manageability and Quality of Service(QoS) guarantee.One of its important characteristics is the diversity of its implementation techniques.Targeting to the improvement of scalability,the enhanced Ethernet technology extends the traditional Ethernet bridging technology with PBB-Traffic Engineering(PBT) as the representative development direction of CE.Multi Protocol Label Switching(MPLS) provides CE with reliable pseudo wire connection based on label switched path.In particular,the combination of MPLS in conjunction with Provider Backbone Bridge(PBB) is one of the important directions in the CE evolution.Taking full advantage of the existing infrastructure of optical transmission networks,the optical ring networking technology exhibits itself as the most economic implementation scheme of CE.The future development will focus on the enhancement of Operation Administration Maintenance(OAM) and control plane functions with the premise that CE keeps to be simple and inexpensive.