Hello,

By IEEE 1588-2008 standard, can a grandmaster clock support peer-to-peer delay 
mechanism, in addition to the request-response delay mechanism?

I did an experiment where I ran ptp4l on one device as grandmaster and on other 
device as slave. The two devices were connected back-to-back, configured to do 
peer-to-peer delay measurement, and the protocol handshaking was fine.

I then tested the Symmetricom TimeProvider 5000 grandmaster and realized it 
only worked with request-response delay measurement protocol.

Thanks,
Daniel

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