Global Navigation Satellite Systems (GNSS) are widely recognised for enabling positioning and navigation. But did you know that GNSS, in fact, transmits the time, while your location is actually calculated based on it? One of their most critical … [Continue reading]
When you glance at your smartphone or a wall clock, it’s easy to take for granted that the time is “right.” But behind that simple number lies one of humanity’s most precise and collaborative scientific efforts: the creation and maintenance of … [Continue reading]
Five Minute Facts on Packet Timing NTP deployments of larger networks usually have NTP servers connected in a tree structure, such as the one in Figure 1. Note that the Stratum 1 servers typically have a GNSS time source, but the higher … [Continue reading]
Five-minute facts about packet timing So, you ‘ve been thinking that NTP messages should have some additional fields, but they’re not in standard. What can you do? You can define your own message extension; that’s what you can do! NTPv4, … [Continue reading]
Five Minute Facts about Packet Timing Level 5, verify, is the highest resilience level according to the IEEE P1952 project. To meet this highest level of resilience PNT equipment must not only withstand an adversity against a PNT input … [Continue reading]
Five Minute Facts about Packet TimingWelcome to the next installment on my series of posts about timing equipment resilience in the language of the IEEE P1952 project. It’s time to talk about level four: Withstand.Withstand is a lot like the Resist … [Continue reading]
Five Minute Facts about Packet TimingI’d like to tell you something about the next IEEE P1952 resilience level in our series. If you missed it, I have been posting about the proposed resilience levels from the IEEE P1952 project. Today’s topic is … [Continue reading]
Five Minute Facts about Packet TimingWelcome to the next installment on my series of posts about timing equipment resilience in the language of the IEEE P1952 project. It’s time to talk about recovery … for clocks that is. The first question about … [Continue reading]
Five Ten Minute Facts about Packet Timing (sorry this one needs to be a little longer)In my last post I talked about the behaviors that timing equipment should exhibit to achieve resilience in the face of adverse conditions, according to the draft … [Continue reading]
Five-minute facts about packet timingA while back I posted on the start of an standards development project: IEEE 1952, or P1952 as they call it in the IEEE standards world. The P stands for project, and that means that it has not yet grown up to … [Continue reading]