Carrier Ethernet(CE) services generally refer to the standardized carrier-class transfer services that feature in excellent scalability,reliability,manageability and Quality of Service(QoS) guarantee,and are offered by carriers to users based on Ethernet technologies.One of the important characteristics of CE service is the diversity of its implementation technologies.Enhanced Ethernet technologies consider scalability as their chief objective so as to extend conventional Ethernet bridge technologies;the latest Provider Backbone Bridge Traffic Engineering(PBB-TE) emerges as the technical trend of CE technology.Multi-Protocol Label Switch(MPLS) offers reliable Pseudowire(PW) connections for CE based on Label Switching Path(LSP).The convergence of MPLS and PBB is one of the important evolution trends for CE.Making full use of the existing Optical Transport Network(OTN) infrastructure,the optical ring network technology is the most cost-efficient and effective way to deliver CE services;its future development trend is characterized by enhancing the Operation,Administration and Maintenance(OAM) function and the control plane.
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