Three factors characterize today’s broadband access networks. First, the DSLAM and aggregation network are based on ATM switching. Secondly, the service and subscriber intelligence is centralized in the network. And thirdly, the main service offered is high-speed Internet access. This paper will explain how the deployment of new multimedia services (such as broadcast TV, NGN voice services, gaming, etc.) and the concurrent adoption of Ethernet technology require a novel broadband access network design. It explores scalable Ethernet connectivity models for broadband access: the intelligent bridging model and the cross-connect model. For efficient and optimized support of multimedia services, these models should be complemented by multi-media service enablers on the DSLAM, such as service enablers for IP auto-configuration, Quality of Service and multicast. This results in a network architecture where subscriber intelligence and service intelligence are distributed in the access network. These enablers are a first step towards the support of more broadband services that tend to rely as much on communication as on content retrieval.
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