PTP - Precision Time Protocol - IEEE 1588v2

[@AhoyCapnLinux]

This video was very clear and thorough, it helped a lot. Thank you!

[@BarbaraAnne]

You're very welcome!

[@honeyshihtzu9675]

Great Work Barbara. Thank you

[@BarbaraAnne]

Thank you! I appreciate the feedback!

[@eteeXRM]

Hi Barbara. Thank you for the informative video. I'm confused about your network latency calculation circa time 4:31. Doesn't the difference between the time the slave sent the delay request (108) and delay response value from the master (112) indicate the one-way network latency from slave to master? This isn't the round trip delay, so I don't know why there is a division by 2.

[@BarbaraAnne]

Hi Amit, There was initial one-way latency in the network for the original Follow Up packet, which is what we're trying to determine. The Delay Request packet is also experiencing one-way latency in the network (in the other direction). So that's why we divide by 2 - to account for the latency in both directions.

[@MP-xz7om]

Great, is there also a video about Software PTP so with with no PTP Hardware and if using Software PTP if a acceptable choice when going for low latency in a small lab enviroment?

[@BarbaraAnne]

I’m not quite sure what you’re asking but there isn’t another video. Sorry

[@ShaunCurrier]

Really fantastic explanation, thank you!

[@BarbaraAnne]

Thanks! I really appreciate the feedback!

[@sliddjur]

Cool! This protocol assumes equal links send and return as you mentioned... But is it even theoretically possible to get equal times when there is *not* equal delay for send and return?

[@BarbaraAnne]

I guess it depends on the precision of your clock and the number of hops between 2 systems involved in the conversation.

[@lixiang3448]

Best video I've ever seen! But I'm confused that this is more like a 1588 v1.

[@BarbaraAnne]

Thank you for your comment. I will look into that.

[@donobanramirezrivero5178]

Great video! thanks for sharing

[@BarbaraAnne]

Thanks for watching!

[@bauyrzhan8652]

Thank you.

[@BarbaraAnne]

You're welcome!

[@bashmogd4468]

Thank YOU

[@BarbaraAnne]

Thank you too! I appreciate the feedback!

[@mensaswede4028]

It seems like this protocol is only useful in highly dedicated networks. In other words, it wouldn’t work over the Internet.

[@BarbaraAnne]

It's really implemented in the Service Providers' networks for their transport, not as an application.

[@AhoyCapnLinux]

The major use for PTP is time sensitivity below microseconds. You'll generally see applications at the service provider level (as Barbara stated), financial sector, or in the space industry. I work with a service provider and our main use for PTP is managing DOCSIS timing, since cable modems effectively "take turns" sending customer-side data to the CMTS, allowing them to occupy the same frequency without interfering with each other.

[@KathyBurton-e3g]

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