Five-minute facts about packet timing gPTP is the name given to the IEEE 802.1AS profile of PTP. gPTP is only sort of a PTP profile. That is because gPTP is independently specified. In other words, rather than stating that it requires, forbids, and allows certain options defined in IEEE 1588, it specifies all these features […]
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What happened at the last ISPCS PTP Plugfest
Five Minute Facts about Packet Timing After three years off for the pandemic, which felt like thirty, the ISPCS has been meeting in person again. In Vienna in 2022, London in 2023, and this year it will be in Tokyo in October. The ISPCS is the International Symposium on Precision Clock Synchronization. It’s a workshop […]
BMCA Deep Dive: Part 2
Five-minute facts about packet timing This is part 2 of a two-part description of the Best Master Clock Algorithm (BMCA). In Part 1 we listed the information that is considered in the BMCA and what the priorities are amongst those quantities. You can think of this information as the clock credentials. If you missed part […]
What’s in the 2019 edition of IEEE 1588: Profile isolation
Five Minute Facts About Packet Timing Next in the series on What is in the 2019 edition of IEEE 1588 is profile isolation. And while we are looking at that we will take a peak at the PTP common message header, the part of PTP message which has the same structure regardless of which PTP […]
What’s in the 2019 edition of IEEE 1588: Mixed Multicast Unicast Operation
Five Minute Facts About Packet Timing By Doug Arnold The next installment in what’s in the revision of IEEE 1588 discusses mixed multicast-unicast operation. In a previous post I described the virtues of mixed multicast-unicast operation in PTP. Sometimes this is referred to as the “hybrid mode”. I summarize the conclusion here, but if you […]
What’s In the 2019 Edition of IEEE 1588?
Five Minute Facts About Packet Timing By Doug Arnold The new edition of IEEE 1588, IEEE 1588-2019 is finally available. The name is based on the year it approved by the IEEE Standards Board, not the year it is published. So, what’s there? Everything that was added or changed was for the purpose of: Making […]
The IEEE 1588 Default Profile
Five Minute Facts About Packet Timing By Doug Arnold. As we’ve seen in previous posts, PTP has many optional features, and often more than one way to do things. This is what gives PTP its awesome flexibility to cover so many different kinds of applications. There is however a dirty secret behind this power: PTP […]