On 2/16/2012 4:52 AM, Thorsten Mühlfelder wrote:
Hello,
I've already posted these questions 8 months ago without answers, but
now the problem came to my mind again. Sorry for double post.
I'm using a Atmel uC embedded device as SNTP server. The code is
working so far, but I wonder what the correct settings are for:
* stratum
If your Atmel uC gets its time from an atomic clock directly, it is
Stratum 1. If Atmel uC gets time from a stratum 1 server it is a
stratum 2 clock and so on. Each hop adds a little more garbage to the mix.
* precision
Precision describes how finely you can "slice" time. This has little or
nothing to do with accuracy.
* root dispersion
* reference identifier
* reference timestamp
The embedded device has a battery buffered hardware RTC, that is
capable of 1 second resolution. The used oscillator though has a
frequency tolerance of 20 ppm.
On startup the device tries to get the time from a pre-configured NTP
server once.
In my understanding my server is a stratum 1 with reference identifier
LOCL. Also I chose reference timestamp as last time correction by
SNTP. Is this correct?
I also wonder about the precision an root dispersion settings, as the
RTC only has a resolution of 1 second.
Thanks for any help, I'd like to set it up the right way.
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