nanog mailing list archives
Re: NIST NTP servers
From: Chuck Anderson <cra () WPI EDU>
Date: Fri, 13 May 2016 10:46:02 -0400
On Fri, May 13, 2016 at 10:12:49AM -0400, Lamar Owen wrote:
On 05/11/2016 09:46 PM, Josh Reynolds wrote:maybe try [setting up an NTP server] with an odroid?... I have several ODroid C2's, and the first thing to note about them is that there is no RTC at all. Also, the oscillator is just a garden-variety non-temperature-compensated quartz crystal, and not necessarily a very precise one, either (precise quartz oscillators can cost more than the whole ODroid board costs). The XU4 and other ODroid devices make nice single-board ARM computers, but have pretty ratty oscillator precision. You really have to have at least a temperature compensated quartz crystal oscillator (TCXO) to even begin to think about an NTP server, for anything but the most rudimentary of timing. Ovenized quartz oscillators (OCXO) and rubidium standards are the next step up, and most reasonably good GPS-disciplined clocks have at least an ovenized quartz oscillator module (the Agilent Z3816 and kin are of this type).
Does anyone know of any COTS NTP servers that are based on non-ancient Linux kernel versions? In 2012 we bought new GPS/CDMA NTP servers with OCXO that are based on Linux 2.4, but they are fiddly as you can imagine with such an ancient software stack. What would people recommend for NTP server hardware/software?
Current thread:
- Re: NIST NTP servers, (continued)
- Re: NIST NTP servers Brandon Vincent (May 11)
- Re: NIST NTP servers Jon Meek (May 11)
- Re: NIST NTP servers Josh Reynolds (May 11)
- Re: NIST NTP servers Lamar Owen (May 13)
- Re: NIST NTP servers Mel Beckman (May 13)
- Re: NIST NTP servers Lamar Owen (May 13)
- Re: NIST NTP servers Mel Beckman (May 13)
- Re: NIST NTP servers Mel Beckman (May 13)
- Re: NIST NTP servers Lamar Owen (May 14)
- Re: NIST NTP servers Laszlo Hanyecz (May 13)
- Re: NIST NTP servers Chuck Anderson (May 13)
- Re: NIST NTP servers Sharon Goldberg (May 13)
- RE: NIST NTP servers John Souvestre (May 12)
- Re: NIST NTP servers Chris Adams (May 12)
- RE: NIST NTP servers John Souvestre (May 12)
- RE: NIST NTP servers Chuck Church (May 11)
- Re: NIST NTP servers George Herbert (May 12)
- RE: NIST NTP servers Allan Liska (May 11)
- RE: NIST NTP servers Chuck Church (May 10)