<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="margin: 0px; font-stretch: normal; line-height: normal;" class=""><span style="font-size: 12px;" class="">We have mobile NWs in both Asia and Europe and also experience a lot of issues with PTP, - almost with every vendor.<br class="">The instabilities, SW-bugs etc. related to PTP seems to indicate that very little testing of this code has been done in production networks. In some deployments we have been able to produce a clock service by installing GNSS on the cell-site. However, in other countries there are regulatory directives that the phase sync must be PTP/Network based.<br class=""> <br class="">Currently, the optical domain is causing us huge problems when we try to engineer a T-BC/PTP solution. This is due to the path asymmetry that exist in the WDM/fiber domain. In some networks we have a lot of DCF in the fiber path and the only way we can get visibility in the asymmetry on these fiber hops is to measure in both direction:(<br class="">Also, running T-BC over WDM/OTN will simply not work as the phase error introduced more or less eats up the phase error budget for 4G/5G TDD-service. </span></div><div class=""><br class=""></div><div class="">best regards,</div><div class="">Geir</div><div><br class=""><blockquote type="cite" class=""><div class="">On 5 Sep 2020, at 00:17, Macho Pellegrini via NANOG <<a href="mailto:nanog@nanog.org" class="">nanog@nanog.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Hello everybody,<div class=""><br class=""></div><div class="">We have deployed PTP in our mobile NW since late 2019 as a part of the 4G/5G, however we are seeing a lots of instabilities and interop issues, a lot of the issues have ended up with SW bugs in the OS, I have no specific question, however I got the impression that the technology/protocol is not yet mature, anybody here got his hands dirty with PTP?</div><div class=""><br class=""></div><div class="">Thanks,</div><div class="">MP</div></div>
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