Missing Delay_Response Messages

Enhanced PTP User Guide (UG1602)

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1.1 English
Figure 1. Flowchart for Missing Delay_Response Messages

The upstream master clock should respond to every Delay_Request message with a corresponding Delay_Response message having the same sequence ID value.

The requestingSourcePortidentity and requestingSourcePortID values in the response message must also match the clockIdentity and sourcePortID values in the request message - otherwise the response message will be ignored.

Missing one or two Delay_Response messages should not affect synchronization accuracy or precision, but missing many of these messages or missing consecutive sequence IDs might harm synchronization of the clocks.