Re: Non-GPS derived timing sources (was Re: NTp sources that work in a datacenter)

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