Hi Macho,

How are you?

Glad to hear this from you. We also have PTP deployed in our transport network as one of the synchronization methods for our mobile networks. And we have encountered a lot of problems as well, such as instabilities, path asymmetry, large TIE variation, poor clock recovery performance, etc. But we have not ended up with any ascertained root causes nor effective solutions to these problems, yet.

I don't know if it is true that PTP / IEEE1588v2 is not mature and reliable enough to meet the minimum syntonization / synchronization requirements of mobile networks (e.g. LTE and 5G NR). Based on my recent observations, I think there may be many we can improve in regard to the timing-over-packet network architecture design and synchronization recovery performance on the slave clock equipment.

An interesting and costly issue to study and figure out as soon as possible. Look forward to hearing further input from you and others.

Thanks and best regards,

Taichi

On Mon, Sep 7, 2020 at 3:36 AM Macho Pellegrini via NANOG <nanog@nanog.org> wrote:

Hello everybody,

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?

Thanks,
MP