From: Neal McBurnett <[EMAIL PROTECTED]> Subject: Re: [time-nuts] NTP stratum 0 Date: Sat, 14 Jan 2006 09:45:21 -0700 Message-ID: <[EMAIL PROTECTED]>
> On Sat, Jan 14, 2006 at 05:25:04PM +0100, TwoSpades wrote: > > I would like to know where could I find the FORMAL specification of the NTP > > stratum 0. > > I often read that it can be a GPS receiver, but I think that there must be a > > formal definition > > of the characteristics of that device. > > The Internet Engineering Task Force (IETF) does a great job of making this > stuff available to the general public, especially when compared to the > ITU or ISO standards. > > NTP is documented in RFC1305: > http://www.potaroo.net/ietf/idref/rfc1305/ > > And SNTP in RFC2030: > http://www.potaroo.net/ietf/idref/rfc1305/ > > Note that the IETF "ntp" working group is working on updating the NTP > standard, again in a relatively refreshing and open manner: > > http://ietf.org/html.charters/ntp-charter.html > > Join us and get a standard TAI spec for NTP! With all this information (which is great BTW) you could also have answered the specific question: 3.4 Stratum (Strat) This is a eight-bit unsigned integer indicating the stratum. This field is significant only in SNTP server messages, where the values are defined as follows: +---------+-------------------------------------------------------+ | Stratum | Meaning | +---------+-------------------------------------------------------+ | 0 | kiss-o'-death message | | 1 | primary reference (e.g., synchronized by radio clock) | | 2-15 | secondary reference (synchronized by NTP or SNTP) | | 16-255 | reserved | +---------+-------------------------------------------------------+ So, Stratum 1 is as low they go or high up in the stratum chain you come. Cheers, Magnus _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
