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PTP is nearly always proprietary. It's very configurable and has to be configured to work. So there are many sets of settings called "profiles", defined by various industries for their own needs. They're not completely interoperable, but all have in common a high precision. So you could say PTP is a kit to build timesync protocols.

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Since this comes from a physics context, it's most likely talking about the white rabbit implementation of ptp, which is open source and open hardware:

https://white-rabbit.web.cern.ch/

PTP is not scalable. It can work fine on smaller networks, but becomes more and more troublesome as the networks get larger and larger.

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