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