IEEE Std 802.3-2015 Cor1 “IEEE Standard for Ethernet Corrigendum 1: Multi-lane Timestamping” was developed by the IEEE P802.3-2015/Cor 1 (IEEE P802.3ce) Multi-lane Timestamping Task Force and approved by the IEEE-SA Standards Board on March 23, 2017.  This corrigendum clarifies timestamping reference points and defines where transmit path data delay and receive path data delay measurements are made.

Timestamping Reference Points

  • The transmit path data delay is measured from the beginning of the start-of-frame delimiter (SFD) at the generic Media Independent Interface (xMII) input to the beginning of the SFD at the Medium Dependent Interface (MDI) output
  • The receive path data delay is measured from the beginning of the start-of-frame delimiter (SFD) at the Medium Dependent Interface (MDI) input to the beginning of the SFD at the generic Media Independent Interface (xMII) output

The Project Authorization Request (PAR), approved on may 12, 2016 can be found here: http://www.ieee802.org/3/ce/P802.3-2015-Cor_1_PAR.pdf

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