Am 17. August 2018 18:07:30 MESZ schrieb Richard Cochran 
<richardcoch...@gmail.com>:
>On Tue, Aug 14, 2018 at 02:56:44PM +0200, Michael Walle wrote:
>> AVnu specifies a measurement method to remotely measure the clock
>> quality. Basically, this method sends Sync and/or Follow-up messages
>on
>> a slave towards the master, which can capture them and measure the
>> quality.
>
>We already have this exact functionality with NSM support.

Sounds like only Meinberg supports that protocol. 

> 
>> The AVnu specification [1] introduces three parameters:
>...
>> [1]
>https://avnu.org/wp-content/uploads/2014/05/Avnu-Testability-802.1AS-Recovered-Clock-Quality-Measurement-1.0_Approved-for-Public-Release.pdf
>
>That looks like abandonware.  I'll need much stronger evidence that
>
>   a) the above is a widely accepted protocol extension, and
>   b) there is a real demand for the same

calnex and ixia (and i guess spirent too) support reverse sync to measure the 
clock accuracy. 

-michael


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