Re: [Ntp] Antwort: Re: Antwort: Re: NTS4UPTP Rev 03 - Formal request for WG adoption (SUPPORT)

Daniel Franke <dfoxfranke@gmail.com> Tue, 01 June 2021 21:23 UTC

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From: Daniel Franke <dfoxfranke@gmail.com>
Date: Tue, 1 Jun 2021 17:22:44 -0400
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To: kristof.teichel@ptb.de
Cc: NTP WG <ntp@ietf.org>
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Subject: Re: [Ntp] Antwort: Re: Antwort: Re: NTS4UPTP Rev 03 - Formal request for WG adoption (SUPPORT)
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On Tue, Jun 1, 2021 at 5:14 PM <kristof.teichel@ptb.de> wrote:
>
> Can you elaborate on how the details of timescale commensuration and the workings of plausibility intervals would be different here than in other aplications?

For example, NTP packets have root delay and precision fields that
should be incorporated into error bound computation. Roughtime doesn't
have anything analogous to these so the calculation would be
different. Some time protocols are based on UTC, some are based on
TAI, and if you mix the two you need to do the conversion and have a
secure way of obtaining DTAI. If you're using Roughtime then you
should get this from the DTAI tag in the Roughtime response if
possible, but if you're using NTS4NTP you probably need to find a
secure source from which to download an NTP leap second file and take
it from that.