[time-nuts] NTP stratum 0

Neal McBurnett neal at mcburnett.org
Sat Jan 14 11:45:21 EST 2006

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:

And SNTP in RFC2030:

Note that the IETF "ntp" working group is working on updating the NTP
standard, again in a relatively refreshing and open manner:


Join us and get a standard TAI spec for NTP!

See also:

 RFC 3339 "Date and Time on the Internet: Timestamps"

  This document defines a date and time format for use in Internet
  protocols that is a profile of the ISO 8601 standard for
  representation of dates and times using the Gregorian calendar.

All of these are written via an open process; free for all to read,
copy, distribute, implement, or be involved in improvements to; with a
complete ABNF syntax specification; compatible with ISO 8601 but
without a sufeit of unnecessary alternative formats like ISO 8601.
Includes a short section on Leap Seconds, lots of info on time zones,


Neal McBurnett                 http://bcn.boulder.co.us/~neal/
Signed and/or sealed mail encouraged.  GPG/PGP Keyid: 2C9EBA60

More information about the time-nuts mailing list