Convergence through packet-aware transport [Invited]

Abstract

We provide a comprehensive description of the Packet-Aware Transport Network (PATN) architecture first introduced in [IEEE Commun. Mag. (3) 120 (2004)]. The PATN architecture provides a more efficient transport of data services such as Ethernet and IP than traditional time-division multiplexing-(TDM) centric access network architectures. The PATN architecture builds upon several emerging technologies and improvements in silicon processing to seamlessly converge multiple network functions onto a single platform, optimize network utilization, and reduce operating costs. The PATN architecture is also designed to support all existing TDM voice, private line, and data services. To validate this architecture we implemented a comprehensive test bed that provides a microcosm of local, metro, and long-distance transport networks. We describe this evaluation methodology and present experimental results of key aspects of the PATN.

Virtual routers on the move

“…However, in practice, what appears as a direct link at the IP layer often corresponds to a series of connections through different network elements at the transport layer. For example, in today's ISP backbones, "direct" physical links are typically realized by optical transport networks, where an IP link corresponds to a circuit traversing multiple optical switches [9,34]. Recent advances in programmable transport networks [9,3] allow physical links between routers to be dynamically set up and torn down.…”

Restoration Design in IP over Reconfigurable All-Optical Networks

“…All the middle SONET and Digital Cross-Connect System (DCS) layers are eliminated. Traditional subwavelength TDM private line service will be transported over the IP network via pseudo-wire circuit emulation with guaranteed minimum latency and quality of service (QoS) [5,6]. Besides providing direct links for the IP layer, the optical network also provides wavelength services via optical connections that consist of one or multiple wavelengths.…”