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Delay Request/Response Mechanism
“Delay_Req messages shall be transmitted as multicast except if:
The optional Unicast provisions of Clause 16 are used
Specified otherwise by a profile”
“For applications that distribute only frequency and do not require the measurement of the path delays, an alternate PTP profile may specify that the path delay mechanisms of 11.3 and 11.4 need not be implemented or activated.”

PPT Version