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58 lines
1.4 KiB
58 lines
1.4 KiB
# Cubo Libre Clock
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Time source will come from Internet NTP and external GPS antenna for
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confirmation. Other external time sources will be considered.
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## Precision Time Protocol (PTP)
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Use precision time protocol within the cluster.
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* Mellanox SN2100 / SN2700 (Spectrum silicon) switches with MLNX-OS/ONYX (in GA since 3.6.5011) for PTP IEEE-1588 (SMPTE ST2059-2 profile)[41] or with Cumulus Linux (from version 3.6) with the ptp4l Linux package.[42]
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## Network Time Protocol (NTP)
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Network Time Protocol is used for time sync from the Internet.
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* Run time server on cluster firewall.
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## GPS
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* External GPS with serial connection to cluster firewall.
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## WWVB
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* WWVB
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https://en.wikipedia.org/wiki/WWVB
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303-499-7111
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https://www.nist.gov/time-distribution/radio-station-wwvb
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https://github.com/TaaviE/radioclkd2
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BPSK new signal on WWVB since 2012 (?)
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http://everset-tech.com/signal/
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http://everset-tech.com/wp-content/uploads/2014/11/CMOSBPSKReceiver.pdf
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## CDMA
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* CDMA time server
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http://beaglesoft.com/celsynhome.htm
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Garmin CDMA35
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Multitech CDMA
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## ACTS
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* The NIST transmits in its own standard Automated Computer Timer Service (ACTS). It is contacted via TCP/IP on port 13
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## Misc
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* Explore SDR/FPGA possibilities.
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* Very particular about very good computer time:
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"The International Occultation Timing Association"
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http://www.lunar-occultations.com/iota/iotandx.htm
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http://beaglesoft.com/radsynreceiver.htm
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* IRIG-B
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