North American Network Operators Group|
Date Prev | Date Next |
Date Index |
Thread Index |
Author Index |
Re: Non-GPS derived timing sources (was Re: NTp sources that work in a datacenter)
- From: Peter Lothberg
- Date: Sun Jun 01 11:15:51 2003
> I don't expect GPS to spin out of control soon..
So GPS tracks TAI and the difference is published (2 months after the
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%...)