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When connecting to the Internet, the CEN can provide the connectivity required to the ISP's Point of Presence (POP) facilitating any required bandwidth with the granularity, manageability, and service performance supported by Carrier Ethernet. Likewise, when a subscriber wants to connect to an application such as a VoIP gateway, this too can be delivered over Carrier Ethernet. One of the benefits to the Subscribers is that the same CEN Service Provider that provides services for corporate interconnectivity can also provide the Internet connectivity. There are two Ethernet services that are appropriate for this application:
The EVPL is simpler from an implementation point of view, but has scalability issues, requiring many EVPLs. Also, the bandwidth is not shared between subscribers, which may be a problem for large deployments in view of the fact that Internet access is often bursty and used at different times of the day by different subscribers. In the following example an ISP named Turbo 2000 Internet Access Inc. is connected to three enterprises for Internet Access. Each customer connects to the ISP's POP using EVPL with CE-VLAN ID of 2000. This enables the customer to use the same UNI port for other services (e.g. Disaster Recovery, L2VPN, etc.) using different CE-VLAN ID(s). See diagram at right. In this example, assume that Customer 1 has purchased a 300 Mbps downlink service and 100 Mbps uplink service for connecting to the ISP over an unprotected UNI that will be used for another service too. The service has a single CoS, with the following performance objectives measured over a 1 hour period:
The appropriate Service Attributes for Customer 1 are: UNI Attributes
UNI per EVC Attributes
EVC Attributes
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