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Carrier Ethernet Interconnect is the key building block for deployment of local regional and global ubiquitous Carrier Ethernet networks.

The principle element is the External Network Network Interface (ENNI) being the physical demarcation point between the responsibility of the two Service Providers defined in MEF 26.1. Service frames passing between two autonomous Carrier Ethernet networks. This include service mapping where support for multiple classes of service, bandwidth profiles, frame disposition (color) is not identical. Guidance is provided as part of MEF 23.1.


  • For service providers acting in a retail capacity
    Typically needing to access branch offices located remotely and accessible via another service provider. The impact is to provide a large regional or global virtual footprint allowing a consistent and deterministic service for its end user customers. This is most dramatic for smaller providers.
  • For service providers acting in a wholesale capacity
    Brings reuse of of existing deployed infrastructure to generate new revenue at low cost. For new providers it is recommended to implement the simplified E-Access services of MEF 33.
  • For enterprises
    Meets to requirement to deliver IT applications in a predictable and consistent manner irrespective to the remote end user location
  • For providers of long haul services
    Enables long haul service contracts to be executed to an industry standard
The following chart shows some of the permutations using ENNI.
The diagram shows the use of a Carrier Ethernet Exchange handling both the physical and service cross-connections between many providers.