Five Minute Facts About Packet Timing By Doug Arnold. One-step or two-step clocks for IEEE 1588? This is a question I hear a lot. If you are designing PTP enabled equipment, then it is a question, which has important ramifications for the architecture of your device. However, if you are buying PTP enabled equipment and […]
What Are All Of These IEEE 1588 Clock Types?
Five Minute Facts About Packet Timing By Doug Arnold. If you are new to the exciting world of IEEE 1588, or even if you are not, you might find yourself confused by all of the different types of clocks. I’ve heard and seen the following terms used related to PTP:
Tales from the ISPCS Plugfest
Five Minute Facts About Packet Timing By Doug Arnold. I recently got back from the ISPCS Plugfest. If you don’t know what this is, 33 organizations came together for three days in Lemgo, Germany to test interoperability of their IEEE 1588 enabled equipment. The annual event is part of the International Symposium on Precision Clock Synchronization […]
About Doug Arnold
About the author: Dr. Douglas Arnold has over 20 years experience developing precise time and frequency equipment and in network time transfer technology. He is currently a Principal Technologist with JTime! Meinberg USA. As part of this role he is a Co-Chair of the IEEE 1588 Working Group, Co-Chair of the IEEE 1588 Architecture Subcommittee, […]
End-to-End Versus Peer-to-Peer
Five Minute Facts About Packet Timing By Doug Arnold. Which delay measurement mechanism is best for deploying IEEE 1588? Since I’m an engineer, the answer is, of course, it depends. The short answer is that the peer-to-peer delay measurement mechanism is best in an engineered network, where all switches (and routers if there are […]
Why is IEEE 1588 so accurate?
Five Minute Facts About Packet Timing By Doug Arnold Why is IEEE 1588 so accurate? Two words: Hardware timestamping. That’s it, really! Let me explain. The Precision Time Protocol, PTP, defined by IEEE 1588-2008 works by exchanging messages between master clocks and slave clocks.