Implementing Transmultiplexing for SONET/SDH MSPPs

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Abstract
This white paper discusses the fundamental concept of transmultiplexing and its importance for carriers in North America as T1 services continue to witness growth, particularly in wireless backhaul applications. With a large installed base of T1/DS3 networks in North America, transmultiplexing provides a solution that bridges the legacy PDH world with today's SONET/SDH networks.

The paper provides a survey of the transmultiplexing (transmux) functionality from a network, equipment and silicon perspective. It outlines the key role this function plays in next generation networks in North America, and how the requirement for supporting transmux drives carrier equipment and silicon developments. The paper illustrates how MSPP vendors can implement highly scalable ported and portless transmux solutions with PMC-Sierra's PM8318 TEMAP 168, which integrates high-density T1/E1 framing, bi-directional performance monitoring and report messaging.

About PMC
PMC-Sierra is a leading provider of high-speed broadband communications and storage semiconductors and MIPS-Powered processors for Enterprise, Access, Metro Optical Transport, Storage Area Networking and Wireless network equipment. The company offers worldwide technical and sales support, including a network of offices throughout North America, Europe and Asia. The company is publicly traded on the NASDAQ Stock Market under the PMCS symbol and is included in the S&P 500 Index.

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 25 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 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.7043 (Virtual concatenation of PDH signals), G.8040 (GFP mapping into PDH signals), and G.8011.1 (Ethernet Private Line Service) recommendations. 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 29 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.

Kevin So is a Product Marketing Engineer in the Communications Product Division at PMC-Sierra and is responsible for Metro Transport products including PDH and Ethernet-over- SONET/SDH (EoS) mapping devices. Previously, Mr. So held technical sales and R&D positions, including engineering roles with Nortel Networks Optical Components and CDMA divisions. Mr. So holds a master's degree in electrical engineering from Carleton University (Ottawa) and an undergraduate degree in electrical engineering from Queen's University (Kingston).

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