nanog mailing list archives
Re: Non-GPS derived timing sources (was Re: NTp sources that work in a datacenter)
From: Peter Lothberg <roll () stupi se>
Date: Sun, 1 Jun 2003 8:13:08 PDT
I don't expect GPS to spin out of control soon..
So GPS tracks TAI and the difference is published (2 months after the fact..) But it's simple to build a 'jamer' that makes GPS reception not work in a limited area, same for Loran-C used in combination with GPS in many Sonet/SDH S1 devices.
but I did wonder how hard it is to find a another reliable clock source of similar quality to GPS to double check GPS.
Short for a lab part of TAI, I really don't knew. GPS price/perfromance is fenomenal.
US clocks account for 40% of the input to TAI.
In the month of April 2003; NIST was 4.662% USNO was 44.314% (and we where 0.501%...) -Peter
Current thread:
- Re: Non-GPS derived timing sources (was Re: NTp sources that work in a datacenter) Peter Lothberg (Jun 01)
- Re: Non-GPS derived timing sources (was Re: NTp sources that work in a datacenter) David G. Andersen (Jun 01)
- Re: Non-GPS derived timing sources (was Re: NTp sources that work in a datacenter) Marshall Eubanks (Jun 01)
- Re: Non-GPS derived timing sources (was Re: NTp sources that work in a datacenter) Sean Donelan (Jun 01)
- Re: Non-GPS derived timing sources (was Re: NTp sources that work in a datacenter) Leo Bicknell (Jun 02)
- Re: Non-GPS derived timing sources (was Re: NTp sources that work in a datacenter) Sean Donelan (Jun 02)
- Re: Non-GPS derived timing sources (was Re: NTp sources that work in a datacenter) N. Richard Solis (Jun 02)
- Re: Non-GPS derived timing sources (was Re: NTp sources that work in a datacenter) Roland Perry (Jun 02)
- Re: Non-GPS derived timing sources (was Re: NTp sources that work in a datacenter) Marshall Eubanks (Jun 01)
- Re: Non-GPS derived timing sources (was Re: NTp sources that work in a datacenter) Jerry Scharf (Jun 28)
- Re: Non-GPS derived timing sources (was Re: NTp sources that work in a datacenter) David G. Andersen (Jun 01)