News for hackers. Stuff that matters.

A comment on One second per second is harder than it sounds. Parent comment

Re:One second per second is harder than it sounds by nick_riviera on Tuesday July 22, 2014 @05:05AM (#8067946)
We had radio time receivers (Rugby MSF, now Anthorn MSF) for a long time in the UK. Just plug them into an RS232 hole and have a site-wide master NTP server on that box, fire up the daemon and you're done.

I think the last one we paid for was in the region of $250 as the hardware is very simple.

http://www.npl.co.uk/science-technology/time-frequency/produ...

GPS is an interesting prospect but they are pretty HF which is a PITA if you have a unit inside a rack inside a machine room inside a building. MSF is 60KHz so is ground wave propagation so it had great coverage.

[ Parent | on HN ]
Re:One second per second is harder than it sounds by easytiger on Tuesday July 22, 2014 @05:54AM (#8068106)
But worth noting it is only ±1 ms accuracy which is not useful in many applications.
[ Parent | on HN ]
Re:One second per second is harder than it sounds by nick_riviera on Tuesday July 22, 2014 @06:29AM (#8068203)
Very true, but system-wide consistency across all participants is a different problem to external reference accuracy but it starts as a reasonable basis that you can reason about.
[ Parent | on HN ]