Designing Fiber-Deep Telephony Networks for Continued Evolution Jim Renfro and Ken ChauvinCorning Cable SystemsThe DLC network is a robust and economical access architecture that has continuously evolved to meet the challenges of changing demographics and increased service demands. Advances in data transmission technology have enabled telco operators to push more and more services to their residential customers, and for the near term, this architecture will continue to be a primary workhorse for brownfield applications. However, sustained growth in bandwidth demands and strong competition from alternative broadband access technologies have significantly changed the landscape. Operators must consider ways to continue to evolve their network in a cost-effective and methodical approach that will enable them to remain competitive in the mid-term.The deployment of fiber-to-the-node (FTTN) and fiber-to-the-curb (FTTC) architectures will continue to push fiber deeper into legacy networks, while at the same time deferring the last segment push to the customer premises. However, in order for operators deploying FTTN and FTTC to remain competitive, they must consider how to effect these upgrades with future upgrades in mind. Specifically, how can these deployments be managed such that they position operators for the final push of fiber to the premises (FTTP). To that end, key considerations to support a natural migration include provisioning fiber assets, optimizing product features, and locating remote network components in a manner that allows a smooth transition to an all-fiber network.This paper explores how telco operators can deploy fiber-deep architectures, while allowing for a more logical migration to pure FTTP networks. Specific topics discussed in this paper include:•Reviewing legacy network architectures•Contrasting key attributes of fiber deep and fiber pure topologies•Strategies for deploying fiber-deep topologies to support a smooth transition to all fiber networks

© 2006 Optical Society of America

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