nanog mailing list archives
Re: Cost-effectivenesss of highly-accurate clocks for NTP
From: Baldur Norddahl <baldur.norddahl () gmail com>
Date: Fri, 13 May 2016 23:01:21 +0200
Den 13. maj 2016 21.40 skrev "Eric S. Raymond" <esr () thyrsus com>:
Traditionally dedicated time-source hardware like rubidium-oscillator GPSDOs is sold on accuracy, but for WAN time service their real draw is long holdover time with lower frequency drift that you get from the cheap, non-temperature-compensated quartz crystals in your PC. There is room for debate about how much holdover you should pay for, but you'll at least be thinking more clearly about the problem if you recognize that you *should not* buy expensive hardware for accuracy. For WAN time service, in that price range, you're wither buying holdover and knowing you're doing so or wasting your money.
Ok how many hours or days of holdover can you expect from quartz, temperature compensated quartz or Rubidium? Should we calculate holdover as time until drift is more than 1 millisecond, 10 ms or more for NTP applications? I am thinking that many available datacenter locations will have poor GPS signal so we can expect signal loss to be common. Some weather patterns might even cause extended GPS signal loss. Regards Baldur
Current thread:
- Cost-effectivenesss of highly-accurate clocks for NTP Eric S. Raymond (May 13)
- Re: Cost-effectivenesss of highly-accurate clocks for NTP Baldur Norddahl (May 13)
- Re: Cost-effectivenesss of highly-accurate clocks for NTP Baldur Norddahl (May 14)
- Re: Cost-effectivenesss of highly-accurate clocks for NTP Mel Beckman (May 14)
- Re: Cost-effectivenesss of highly-accurate clocks for NTP Eric S. Raymond (May 15)
- Re: Cost-effectivenesss of highly-accurate clocks for NTP Mel Beckman (May 15)
- Re: Cost-effectivenesss of highly-accurate clocks for NTP Eric S. Raymond (May 15)
- Re: Cost-effectivenesss of highly-accurate clocks for NTP joel jaeggli (May 15)
- Re: Cost-effectivenesss of highly-accurate clocks for NTP Mel Beckman (May 15)
- Re: Cost-effectivenesss of highly-accurate clocks for NTP Lamar Owen (May 16)
- Re: Cost-effectivenesss of highly-accurate clocks for NTP Mel Beckman (May 16)
- RE: Cost-effectivenesss of highly-accurate clocks for NTP Jameson, Daniel (May 16)
- Re: Cost-effectivenesss of highly-accurate clocks for NTP Baldur Norddahl (May 14)
- Re: Cost-effectivenesss of highly-accurate clocks for NTP Baldur Norddahl (May 13)