Five Minute Facts about Packet Timing The IEEE Standards Association will soon published IEEE 1588g-2022, an amendment to IEEE 1588-2019. The amendment recommends optional alternative terms for master and slave. The terms selected are: The … [Continue reading]
Five-minute facts about packet timing If you’ve been paying attention, and I know you have, there has been a lot of discussion lately about the fact that the critical infrastructure of the world is dependent on GNSS for position, navigation, and … [Continue reading]
Five-minute facts about packet timingOnce upon a time there was an industry that needed data sharing and time synchronization among devices that were spatially disbursed. So, the industry developed standards for data transfer and timing signals that … [Continue reading]
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 … [Continue reading]
Five-minute facts about packet timingI previously posted about the Best Master Clock Algorithm or BMCA. Nevertheless, this aspect of the Precision Time Protocol (PTP) continues to stimulate questions from equipment designers and network operators. … [Continue reading]
Five-minute facts about packet timingNetwork Time Protocol version 4 (RFC 5905) is a spectacularly successful network time transfer protocol. It can be found in almost every IP network. Often NTP messages will traverse leased lines or the “public … [Continue reading]
5 minute facts about packet timingIn a previous post I talked about the new redundant networking protocols High Availability Seamless Redundancy (HSR) and Parallel Redundancy Protocol (PRP). These protocols are defined in the IEC 62439-3 standard. … [Continue reading]
Five Minute Facts About Packet Timing If you examine an NTP packet you will see the fields root delay and root dispersion. See the diagram from RFC 5905 in Figure 1 bellow, which defines NTP version 4, the current version. You might ask … [Continue reading]
Five Minute Facts About Packet TimingIn multicast PTP a slave port need only subscribe to the PTP multicast addresses and timing will come to it. However, in unicast PTP a slave port has to reach out to the master port it wants time from with PTP … [Continue reading]
Five Minute Facts About Packet Timing Time to play what's new in IEEE 1588-2019, the game where everyone wins new PTP features. L1 Sync is short for physical layer frequency synchronization. Recall that frequency sync is also referred to … [Continue reading]