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PSAP Master Clock STA - Public Review-Breen feedback 5-3-2016 Term or Abbreviation (Expansion) ASCII (American Standard Code for Information Interchange) BCD (Binary Coded Decimal) IRIG (Inter-RangeInstrumentation Group) NIST (National Institute of Standards and Technology) Definition / Description A standard for defining codes for information exchange between equipment produced by different Manufacturers. A code that follows the American Standard Code for Information Interchange. Ref: NENA-STA-027 (originally 04-001) Ref: NENA 02-010 A coding system in which each decimal digit from 0 to 9 is represented by four binary (0 or 1) digits. This group, in 1959, proposed a series of time code formats now known as IRIG or NASA time codes. The U.S. Government agency that oversees the operation of the U.S. National Bureau of Standards. NIST works with industry and government to advance measurement science and to develop standards in support of industry, commerce, scientific institutions, and all branches of government. NTP (Network Time Protocol) A powerful utility for synchronizing system clocks over a TCP/IP network SBS (Straight Binary Seconds) A binary number that appears in the IRIG time code which represents the total number of seconds since Midnight. A networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks. SNTP (Simple Network Time A utility for synchronizing system clocks over a TCP/IP network. This protocol is similar to NTP and Protocol) is used when the ultimate performance of the full NTP Implementation is not needed. TTL (Transistor to Transistor An internal transfer standard for electronics devices in which a 1 state is +5 volts and a zero state is 0 volts. [There is a Comment in v19 that reads: “change the definition of Logic) TTL from “Transistor to Transistor Logic” to “Transistor-Transistor Logic”. Alternatively, just remove the definition, as it is not particularly unique to emergency telecommunications.”] UPS (Uninterruptible Power A backup system designed to provide continuous power in the event of a commercial power failure or fluctuation. A device that provides battery backup when the electrical Supply) power fails or drops to an unacceptable voltage level. Small UPS systems provide power for a few minutes; enough to power down the computer in an orderly manner, while larger systems have enough battery for several hours. Ref: NENA-INF-017 **New (N) / Update (U) U (this adds a Ref to existing, so it is an “U”. Use MG definition, it contains a Reference N N U There is a better description (shown here) pending approval in MG v19, from i3v2 U Use MG definition, it contains a Reference Not new or Updated. N Keep this to fill the existing gap in MG There is a better description (shown here) pending approval in MG v19 Term or Abbreviation (Expansion) Definition / Description UTC (Coordinated Universal Also known as Zulu or GMT. Time provided by National Institute of Standards and Technology (NIST) and United States Naval Observatory (USNC). Time) The primary time standard by which the world regulates clocks and time. It is, within about 1 second, mean solar time at 0° longitude; it does not observe daylight saving time. The primary time standard in the world based on the time zone in Greenwich. **New (N) / Update (U) There is a better description (shown here) pending approval in MG v19