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1722 timestamp uncertain to allow for implementing glitch-free PTP grandmaster transitions #15

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larry-xmos opened this issue Sep 7, 2016 · 2 comments
Open

1722 timestamp uncertain to allow for implementing glitch-free PTP grandmaster transitions #15

larry-xmos opened this issue Sep 7, 2016 · 2 comments
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enhancement

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@larry-xmos
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Customer testing with frequent grandmaster transitions revealed a scenario, where media clock generation gets stuck in its "debouncing period" if there is a PTP discontinuity before media clock lock is reached.

Timestamp-uncertain with some rudimentary handling would probably avoid this scenario.
@larry-xmos
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Note: Workaround implemented in aee7f56 by adding a large threshold that stops the "debouncing period".

@larry-xmos
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See also http://www.ieee802.org/1/files/public/docs2007/as-harrison-MediaClock-GMchange-0607.pdf

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