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Re: [art] New Version Notification for draft-touch-time-05.txt

Joe Touch <touch@strayalpha.com> Tue, 12 November 2019 02:58 UTC

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From: Joe Touch <touch@strayalpha.com>
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Date: Mon, 11 Nov 2019 18:57:53 -0800
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Subject: Re: [art] New Version Notification for draft-touch-time-05.txt
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A little more about PTP, found here:
https://www.iol.unh.edu/sites/default/files/knowledgebase/1588/ptp_overview.pdf

>>>> Should PTP be added to the list of time scales? (Given section 7 talks
>>>> about selecting timescales I think it's worth pointing out one that is of
>>>> practical use in computing, as opposed to TAI which is a retrospective
>>>> paper clock.)
>>> 
>>> PTP isn't a time scale; it's a system for reporting time. The problem is
>>> it reports multiple timescales that are already discussed.
>> 
>> The impression I get is that although PTP can transport different
>> timescales, it almost always uses a specific one which is different from
>> the other ones in the draft. (It differs from Unix time by the number of
>> leap seconds.)

The source above claims PTP tries to coordinate the local clock to TAI.

That doc confirms it isn’t a time scale, as I originally indicated.

Joe

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