KEYWORDS: Internet, Local area networks, Network architectures, Fast packet switching, Time division multiplexing, Interfaces, Clouds, Network security, Systems modeling, Data modeling
With its low cost, ubiquity, and scale, Ethernet is the technology most widely envisioned to change the economics of packet service delivery for both carriers and their customers. This paper discusses a new architecture that simplifies and lowers the cost to deliver data services. By fully integrating Ethernet with existing SONET/SDH networks in a "Virtual Ethernet Ring," carriers can now provide a multipoint Ethernet service that can span long distances across multiple metro areas.
This architecture leverages the plug-and-play advantages of Ethernet - auto-provisioning, broadcast and discovery, etc. - across a distributed wide area network. It provides the advantage of granular, software-provisioned bandwidth to the customer. It also provides SONET/SDH quality resilience with security and bandwidth guarantee. By incorporating protocol mediation technology, this architecture enables the migration from today's frame relay, ATM and IP services to a new generation of granular, readily scalable Ethernet services such as Ethernet Private Line, Ethernet Virtual Private Lines and Internet/Frame Relay/ATM/Access Services.
KEYWORDS: Fast packet switching, Switches, Internet, Network architectures, Time division multiplexing, Local area networks, Bridges, Computer architecture, Circuit switching, Data communications
Data services are a primary target for increasing carrier revenues. As carriers prepare to capture this opportunity, they must determine how to cost-effectively deliver the more flexible and scalable bandwidth customers are requesting. Ethernet has emerged as a key technology for delivering these next-generation services; it is easy-to-use, widely understood and offers lower cost to both carriers and end customers. With more bandwidth available in the carrier core, the next challenge is the Metropolitan Area Network (MAN), where data services have been constrained by technologies optimized for voice services.
This paper describes an Ethernet-over-SDH/SONET migration scenario that enables a portfolio of metro data services, such as Internet access and Virtual Private Lines, which can be delivered. It illustrates how optimizing SONET/SDH networks for next-generation data services will prove to be more cost-effective, scalable, manageable and resilient.
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