Product Details
Details about the physical description and operating environment of the S100 are found in Appendix A, “S100 Specifications” on page 119 of this User Guide.
Details about S100 operations are in “The
Time Standards
The international time standard is called Coordinated Universal Time or, more commonly, UTC. This standard was agreed upon in 1972 by worldwide representatives within the International Telecommunications Union; today, the Internet Engineering Task Force (IETF) sets standards based on the 1972 work. Today UTC is coordinated by the world’s International Bureau of Weights and Measures, or BIPM. (The designations “UTC” and “BIPM” were chosen as a compromise among all the countries’ abbreviations for the terms.)
The global availability and precision of UTC time makes it the ideal source of time for Time. The S100 uses UTC as its time standard.
Global Positioning System (GPS)
The U.S. Department of Defense Global Positioning System (GPS) is a constellation of approximately 29 satellites that orbit Earth twice a day. Their orbits are inclined 56 degrees to the equator. The GPS satellites signals are used by a GPS receiver to precisely determine its own position and time.
The orbits of these satellites and the offset (relative to international standard time, UTC) of their
The “S100 GPS” model uses GPS to obtain time. (The “S100 ACTS” model obtains time by dialing NIST's Automated Computer Time Service (ACTS).)
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