26 Jun
2019
26 Jun
'19
1:39 a.m.
ps:
a different clock domain requires a dedicated GM. 1588 and 802.1AS are seperate clock
domains.
Am 24. Juni 2019 16:13:05 MESZ schrieb Chris Caudle <chris(a)chriscaudle.org>rg>:
On Mon, June 24, 2019 6:46 am, Christoph Kuhr wrote:
--
Diese Nachricht wurde von meinem Android-Gerät mit K-9 Mail gesendet.
What is the need for a specific GM if you AVB
switch is down?
Thus, one of the AVB switches involved should be the GM. The
"core-most"
switch in particular.
Or can someone think of a scenario, where this does not make sense?
If you have a higher quality device (for example a network master clock
connected to GPS disciplined oscillator for high stability). In that
case
the device should advertise a higher quality and should be selected as
master clock in any case.
One other case which comes to mind is if you want a multi-protocol
device
to be master for a mixed system, so a single device providing
synchronized
802.1AS for AVB devices, and layer 3 1588 messages for layer 3 devices.
Definitely starts getting into specialized cases, and you should be
able
to set the clock quality field on a specialized clock source like that
so
that it always wins the best master clock vote.
--
Chris Caudle
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