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IEEE 802.3cx improves the timing performance and timestamp accuracy of Ethernet interfaces, including considerations for the following aspects:

  • Data delay measurement point, DDMP (i.e. the message timestamping point)

  • Idle, Alignment Marker (AM), and Code Word Marker (CWM) insertion and removalData delay measurement point, DDMP (i.e. the message timestamping point)

  • PCS lane distribution and merging

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