Re: [CentOS] System Time Source

On Thu, May 25, 2017 11:16 am, Lamar Owen wrote: > [Going a bit off-topic here, and going to do a bit of a deep-dive on RF > stuff, but maybe it will be useful to Chris] Lamar, thanks a lot for very instructive write-up!! Valeri > > On 05/24/2017 12:20 PM, Valeri Galtsev wrote: >> It is

Re: [CentOS] System Time Source

[Going a bit off-topic here, and going to do a bit of a deep-dive on RF stuff, but maybe it will be useful to Chris] On 05/24/2017 12:20 PM, Valeri Galtsev wrote: It is insightful, yet... There are a bunch of other factors that may need to be taken into account. Angular transmission pattern of

Re: [CentOS] System Time Source

Time on computers is typically set using Network Time Protocol (NTP) over the internet however I believe these [1] devices do what you're describing. [1] - https://www.meinbergglobal.com/english/products/pci-express-clocks.htm On 24 May 2017 at 15:53, Chris Olson wrote:

[CentOS] System Time Source Responses

It looks like we may have hit on a popular subject with the questions about system time sources.  Thanks for all of the responses.  Our intern and senior software staff now have useful information and new perspective. ___ CentOS mailing list

Re: [CentOS] System Time Source

On Wed, May 24, 2017 10:45 am, Warren Young wrote: > On May 24, 2017, at 8:52 AM, Chris Adams wrote: >> >> Once upon a time, Warren Young said: >>> a. It’s transmitting from a fixed location in a time zone you >>> probably aren’t in — US Mountain —

Re: [CentOS] System Time Source

On 05/24/2017 11:37 AM, Tate Belden wrote: Warren, one slight correction on an other wise nicely written bit of info: The time transmitted from WWV is not Mountain Time. Even though the WWV transmitter farm is located in the Mountain time zone, the signals are transmitted as "Coordinated

Re: [CentOS] System Time Source

On May 24, 2017, at 9:37 AM, Tate Belden wrote: > > The time transmitted from WWV is not Mountain Time. I should have split the paragraph, because I didn’t mean to imply that that was the case. My point in mentioning the transmission location is to show that it’s probably a

Re: [CentOS] System Time Source

On Wed, 24 May 2017, Pete Biggs wrote: The GPS time system is also notoriously very precisely wrong. The time was set when the first satellite was sent up and has never been corrected since - so hasn't taken account of leap seconds or relativistic effects. All that matters for GPS is that the

Re: [CentOS] System Time Source

On 05/24/2017 11:29 AM, Pete Biggs wrote: ... The terrestrial radio clocks are actually not that accurate. They are not designed for keeping things like a system clock "correct". Commercial solutions only keep to within about +/- 0.5s per day, with resynchronisation happening about once a day.

Re: [CentOS] System Time Source

On May 24, 2017, at 8:52 AM, Chris Adams wrote: > > Once upon a time, Warren Young said: >> a. It’s transmitting from a fixed location in a time zone you probably >> aren’t in — US Mountain — being the least populous of the lower 48’s four >> time zones.

Re: [CentOS] System Time Source

Warren, one slight correction on an other wise nicely written bit of info: The time transmitted from WWV is not Mountain Time. Even though the WWV transmitter farm is located in the Mountain time zone, the signals are transmitted as "Coordinated Universal time", UTC, or 'Zulu' time. Here, you

Re: [CentOS] System Time Source

On Wed, 2017-05-24 at 13:53 +, Chris Olson wrote: > One of our STEM interns recently observed that there are > inexpensive clocks that sync via radio to standard time > services.  This begged a question about why every computer > would not have a radio module to receive time.  Our senior >

Re: [CentOS] System Time Source

Once upon a time, Warren Young said: > a. It’s transmitting from a fixed location in a time zone you probably aren’t > in — US Mountain — being the least populous of the lower 48’s four time > zones. You therefore have to configure time zone offset and DST rules, which >

Re: [CentOS] System Time Source

Chris Olson kirjoitti 24.5.2017 klo 16.53: > One of our STEM interns recently observed that there are > inexpensive clocks that sync via radio to standard time > services. This begged a question about why every computer > would not have a radio module to receive time. Terrestrial time services

Re: [CentOS] System Time Source

On May 24, 2017, at 7:53 AM, Chris Olson wrote: > > One of our STEM interns recently observed that there are > inexpensive clocks that sync via radio to standard time > services. There are two major types: 1. WWVB and its equivalents in other countries:

Re: [CentOS] System Time Source

Once upon a time, Chris Olson said: > One of our STEM interns recently observed that there are > inexpensive clocks that sync via radio to standard time > services.  This begged a question about why every computer > would not have a radio module to receive time.  Our

Re: [CentOS] System Time Source

Chris Olson wrote: > One of our STEM interns recently observed that there are > inexpensive clocks that sync via radio to standard time > services.  This begged a question about why every computer > would not have a radio module to receive time.  Our senior > staff did not have a good answer or if

Re: [CentOS] System Time Source

On 05/24/2017 09:53 AM, Chris Olson wrote: One of our STEM interns recently observed that there are inexpensive clocks that sync via radio to standard time services. This begged a question about why every computer would not have a radio module to receive time. Our senior staff did not have a

[CentOS] System Time Source

One of our STEM interns recently observed that there are inexpensive clocks that sync via radio to standard time services.  This begged a question about why every computer would not have a radio module to receive time.  Our senior staff did not have a good answer or if time from such a radio