2 research outputs found
The Challenges Facing Science Data Archiving on Current Mass Storage Systems
This paper discusses the desired characteristics of a tape-based petabyte science data archive and retrieval system required to store and distribute several terabytes (TB) of data per day over an extended period of time, probably more than 115 years, in support of programs such as the Earth Observing System Data and Information System (EOSDIS). These characteristics take into consideration not only cost effective and affordable storage capacity, but also rapid access to selected files, and reading rates that are needed to satisfy thousands of retrieval transactions per day. It seems that where rapid random access to files is not crucial, the tape medium, magnetic or optical, continues to offer cost effective data storage and retrieval solutions, and is likely to do so for many years to come. However, in environments like EOS these tape based archive solutions provide less than full user satisfaction. Therefore, the objective of this paper is to describe the performance and operational enhancements that need to be made to the current tape based archival systems in order to achieve greater acceptance by the EOS and similar user communities
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Frame Synchronization in PCM Telemetry
International Telemetering Conference Proceedings / September 27-29, 1971 / Washington Hilton Hotel, Washington, D.C.Frame synchronization of PCM telemetry data can be accomplished very effectively by employing the fixed threshold method with a unique strategy. Probability of false sync acquisition and maintenance can be made negligibly small for data having bit error rates less than 10%, at a small sacrifice in acquisition time. Furthermore, experimental results indicate that frame synchronization is significantly affected by the frame sync code length rather than by the code pattern itself, i.e., any pseudo-random code is just as good. The difference in performance between "optimum" codes and any pseudo-random code is negligible.International Foundation for TelemeteringProceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection