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Dear all, I have been trying to parse through the deck on PTP "issues", as presented at the last NEA meeting in Salt Lake City (http://www.ieee802.org/3/ad_hoc/ngrates/public/19_05/tse_nea_01a_0519.pdf), and come up with just one or two items that warrant any work. Perhaps I am misreading the presentation and there is much more to it, but it seems to me that the main "issues" that are supposed to be addressed in the new potential Study Group would be as follows:
If I am reading these right, I thought that the second item was already addressed before, through updates to Clause 90. Perhaps I am missing the point that the presentation as trying to make, given that it is buried in so much detail it is hard to parse. On item 1, again perhaps I am reading it wrong, but it seems like it would cause a fixed delay that should be trivial to account for in any implementation – it seems to be nothing more than a shift in the reference point that happens one each and every frame in exactly the same way. If that is a case, it seems it is a non-issue, really. Thank you for the clarification Marek -----Original Message----- Dear Colleagues, The following request for agenda time for a call for interest has been received from Steve Gorshe. It will be discussed at the IEEE 802 LMSC July 2019 Plenary meeting in Vienna, Austria. If you have any questions please get in touch with either Steve Gorshe <steve.gorshe@xxxxxxxxxxxxx> or myself directly. ---- Applications in which Precision Time Protocol (PTP) (e.g., IEEE Std 1588 or IEEE Std 802.1AS) is carried over Ethernet interfaces have become increasingly important. A growing number of applications benefit from being able to communicate frequency and time synchronization information over Ethernet. Emerging important potential Ethernet applications such as 5G mobile radio access networks require increased PTP accuracy. Unfortunately, the increased complexity of several recent IEEE Std 802.3 PHYs have inadvertently introduced limitations or degradations of the potential PTP accuracy. In some cases, the decreased PTP accuracy is related to a discrepancy between IEEE Std 802.3 and IEEE Std 802.1AS/1588 reference points. Addressing these issues will increase the scope of applications in which Ethernet can be deployed. This Call for Interest is to assess the support for the formation of a Study Group to explore the potential markets requirements and feasibility of amending the IEEE 802.3 Ethernet standard to support high accuracy frequency and time synchronization. ---- The call for interest will take place during the IEEE 802.3 Opening Plenary on the morning of Monday 15th July. A call for interest consensus building meeting has been scheduled to occur from 19:30 to 20:30 on the evening of Tuesday 16th July. The vote to determine if a Study Group will be formed will take place at the IEEE 802.3 Closing Plenary on the afternoon of Thursday 18th July. Best regards, David Law, Chair, IEEE 802.3 Ethernet Working Group Phone: +44 1631 563729 Email: mailto:dlaw@xxxxxxx ________________________________________________________________________ To unsubscribe from the STDS-802-3 list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-3&A=1 To unsubscribe from the STDS-802-3-DIALOG list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-3-DIALOG&A=1 |