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Transporting Sub-ODU1 Rate Signals in the OTN

Abstract
The OTN brings the potential for a simplified transparent transport network that can ultimately replace SONET/SDH at Layer 1. In order to do this, however, the OTN must be capable of carrying a number of important legacy, including GE and SONET/SDH, and emerging client signals with sub-ODU1 rates, including SAN and native video signals. This white paper summarizes the different approaches that have been considered for transporting sub-ODU1 client signals. While one approach, the ODU0, has been standardized by the ITU-T, it will be many years before ODU0 support is available in the OTN. The need exists for alternative methods that can be deployed in the meantime, and also to support important long term applications. This white paper describes the alternatives for sub-ODU1 rate client signal transport, and the applications for each.

About PMC
PMC-Sierra is a leading provider of broadband communications and storage semiconductors for metro, access, fiber to the home, wireless infrastructure, storage, laser printers, and fiber access gateway equipment. PMC-Sierra offers worldwide technical and sales support, including a network of offices throughout North America, Europe, Israel and Asia. The company is publicly traded on the NASDAQ Stock Market under the PMCS symbol. For more information, visit www.pmc-sierra.com.

About the Authors
Steve Gorshe, Ph.D. is a Principal Engineer in PMC-Sierra's Chief Technology Officer's organization, working on technology for optical transmission and access systems.

Steve is a Fellow of the IEEE. He has been with PMC-Sierra since 2000, and has 27 years of experience in research and development of telecommunications systems and ICs. His previous work included holding the position of Chief Architect for NEC eLuminant Technologies. He is the current IEEE Communications Society Director of Magazines, Associate Editor-in-Chief and former Broadband Access Series co-editor for IEEE Communications magazine. He is Chief Editor and a technical editor for multiple standards for the ATIS OPTXS Committee (formerly T1X1), which is responsible for ANSI transport network interface standards including SONET. He has is also technical editor for multiple ITU-T standards, including G.7041 (Generic Framing Procedure - GFP), G.8011.1 (Ethernet Private Line Service), and G.Sup43 (Transport of IEEE 10G Base-R in Optical Transport Networks (OTN)). He is a recipient of the Committee T1 Alvin Lai Outstanding Achievement Award and the ATIS Outstanding Contribution award for his standards work. He has 32 patents issued or pending, over 24 published papers, and is co-author of a telecommunications textbook and of two additional book chapters. Steve received his Ph.D. and MSEE from Oregon State University and BSEE from the University of Idaho.

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