Introduction to the PTP state machine

This video is about the PTP state machine executed by each port of each PTP clock. I do not explain the full state machine, but just a simplified version of it that considers three states only: listening state, master state, and slave state.

[@DrAgile-qp1pd]

Thank you David! Really well done. Simple and effective!

[@andreap86082]

This is the very simplified version since the role of the announce message is missed. The ptp announce message is very important since contains the PTP priority ( the Port with the lower priority value become the master!).

[@aironaldana4638]

Hi David! Very helpful videos. How does a clock determine it is better clock?

[@manunibal]

It seems there is an error here. The annouce messages are used to change the state of the PTP ports, not the sync messages. And the announce message contain 2 parametes clockClass and ClockAccuracy to determine which is the best clock

[@haydarveli6470]

@@manunibal exactly.

[@Unimath22]

I thought the master/slave state is determined via the exchange of announce messages?

[@xlh8370]

Agree. Sync message doesn't contain information about the quality of a clock.

[@pavanlakote]

PTP is easy only after watching your videos

[@majedyouness9478]

00:34 the network must be symmetrical and cannot have alternate paths in one direction