Kevin, I don't entirely agree.
I can use PTP or NTP to distributed frequency without looking at the ToD (even if it is correct). So I would claim that they distribute timing, where by "timing" I mean time or frequency. What the protocols definitely don't do is synchronize. I guess one could claim that NTP does synchronize, since in addition to a protocol it specifies an algorithm for synchronizing a clock. But 1588 does not specify the control loop, and thus does no synchronization at all! Y(JS Yaakov (J) Stein CTO T: +972-3-645-5389, +972-2-588-9159 | F: +972-3-647-5924 | [email protected]<mailto:[email protected]> RAD Data Communications Ltd., 24 Raoul Wallenberg St., Tel-Aviv 69719, Israel | www.rad.com<http://www.rad.com> | www.raddata.blogspot.com From: Kevin Gross [mailto:[email protected]] Sent: 18 March, 2013 17:48 To: Yaakov Stein Cc: [email protected]; Tal Mizrahi Subject: Re: [TICTOC] TICTOC Security Requirements "Timing distribution protocols" is flawed because protocols distribute time, not timing. "Time synchronization protocols" is flawed because the protocols synchronize clocks; only god synchronizes time. NTP defines itself through self-reference. 1588 seems to get it right, "IEEE standard for a precision clock synchronization protocol for..." On Mon, Mar 18, 2013 at 8:37 AM, Yaakov Stein <[email protected]<mailto:[email protected]>> wrote: General I personally prefer "timing distribution protocols" to "time synchronization protocols", as I think the protocol distributes the timing (time and/or frequency) while the specific sync algorithm performs the synchronization.
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