[ntp:questions] Re: Looking for time sync hardware supported under Linux for under $400?
timkeck at gmpexpress.net
Wed Jan 18 10:23:23 UTC 2006
Richard B. Gilbert wrote:
> You can get an "FS Oncore" GPS Timing receiver from Synergy Systems
> You should plan to purchase one with the "evaluation kit" unless you are
> equipped to design and produce your own circuit board. I bought one
> about fourteen months ago when they were still manufactured by Motorola
> and paid about $200 US for it. It comes with a power supply (wall
> wart) and an antenna. I've been using it with a Sun Ultra 10 running
> Solaris 8. It generally synchronizes within a millisecond or less.
> sunblok_$ ntpq -p
> remote refid st t when poll reach delay offset
> *GPS_ONCORE(0) .GPS. 0 l 4 16 377 0.000 0.001
> There are other GPS receivers that will work quite nicely; one sells for
> around $85 US. Be certain to get one with a serial (RS-232) interface
> (the USB interface does not work well in timing applications). Also be
> certain to get a receiver designed for timing applications. Many GPS
> receivers are designed for navigation and it is generally not possible
> for a receiver to do both timing and navigation well.
Maybe I'm confused, but aren't the delay, offset, and jitter in
milliseconds, indicating (here) 1 microsecond offset and jitter?
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