Evolution of SAS

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Abstract
SAS is evolving. SAS, which has replaced cabled parallel SCSI as the interconnect technology of choice, provides high bandwidth and high data throughput and is compatible with existing SATA topologies. This paper provides an overview of SAS and discusses how second generation SAS controllers, expanders and port multiplexers can be optimized to ensure better bandwidth utilization, easier management and network robustness.

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 and is included in the S&P 500 Index. For more information, visit www.pmc-sierra.com.

About the Authors
Tim Symons is a Principal Engineer and Storage architect at PMC-Sierra and represents PMCSierra in the storage standard bodies. Prior to joining PMC-Sierra, Mr. Symons was a Storage Systems Architect and Technologist with Adaptec Inc. (formerly Eurologic Systems). Mr. Symons has a Bachelor of Science (Honors) degree in Electrical & Electronic Engineering from the University of Plymouth, UK.

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