IRIG timecode: Difference between revisions

Revision as of 04:18, 13 December 2007

Revision as of 15:19, 17 December 2007

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:0) (DCLS) Direct Current Level Shift (width coded)

:1) Sine wave carrier (amplitude modulated),

:2) [[Manchester_codeManchester code|Manchester]] modulated

:Carrier Resolution:

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For example, one of the most common formats, IRIG B122:

IRIG B122 transmits one hundred pulses per second on an amplitude modulated 1 kHz sine wave carrier, encoding information in BCD. This means that 100 bits of information are transmitted every second. The time frame for the IRIG B standard is 1 second, meaning that one data frame of time information is transmitted every second. This data frame contains information about year (0-99), the day of the year (1-366), hours, minutes, and seconds. Information as to which century it is, is not transmitted. [[Leap second]] announcements are not provided. Although information is transmitted only once per second, a device can sychronize its time very accurately with the transmitting device by using a [[phase locked loop]]. Typical commercial devices will synchronize to within 1 microsecond using IRIG B timecodes.

==ReferenceReferences==

*[https://wsmrc2vger.wsmr.army.mil/rcc/manuals/200-04/TT-45.pdf IRIG standard 200-04 (PDF)]

[[Category:Synchronization]]

==External links==

* [http://www.meinberg.de/english/info/irig.htm IRIG information] IRIG information page with diagrams.

[[Category:Synchronization]]

[[de: IRIG Timecode]]

[[de: IRIG Timecode]]