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How to pick an oscillator for holdover

April 29, 2024 by Douglas Arnold 2 Comments

5 Minute Facts About Packet Timing You have a holdover requirement, and you need to select an oscillator from the choices presented to you by your timing equipment vendor. More stable oscillators are better, but they also cost more. You want to know which is the least expensive option that meets your requirement. However, the […]

Filed Under: IEEE 1588, Industry Applications, NTP

Genlock in a networked world

August 12, 2022 by Douglas Arnold Leave a Comment

Five-minute facts about packet timing Once 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 each device could interface to, and everything worked. But the technical professionals in the industry did not […]

Filed Under: IEEE 1588, Industry Applications, NTP

Network Time Security (NTS): Updated security for NTP

July 14, 2021 by Douglas Arnold 1 Comment

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 internet”. Therefore, it is especially important that an NTP client can determine that the NTP server is […]

Filed Under: NTP, Security

The Root of All Timing: Understanding root delay and root dispersion in NTP

February 25, 2021 by Douglas Arnold 2 Comments

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 what is with all this “root” stuff?  Root in this case refers […]

Filed Under: NTP

GNSS Spoofing and how to mitigate it

April 14, 2020 by Douglas Arnold Leave a Comment

Five Minute Facts About Packet Timing In a previous post I talked about GNSS jamming and how to mitigate it. Today I will discuss GNSS spoofing. Once again GNSS means Global Navisgation Satellite System, which includes not only GPS, but similar systems like the European Galileo. GNSS jamming is bad, but at least you always […]

Filed Under: IEEE 1588, Industry Applications, NTP, Security

GNSS jamming and how to mitigate it

April 12, 2020 by Douglas Arnold Leave a Comment

Five Minute Facts About Packet Timing This post discusses GNSS jamming, for a discusstion of GNSS Spoofing see the follow up post. Before a timeserver transmits messages with timing information it usually gets that information from a GNSS receiver. That is a Global Navigation Satellite System. Such systems include the Global Positioning System (GPS), Galileo, […]

Filed Under: IEEE 1588, Industry Applications, NTP, Security

Performance Level Options for the Meinberg HPS100 card

November 28, 2019 by Andreja Jarc Leave a Comment

Five Minute Facts About Packet Timing By Andreja Jarc. I promised you in my earlier post, that I will update you on how to pick the right license model and performance level of your High-Performance Synchronization (HPS100) card. Each performance level defines a number of packets / second or number of unicast slaves that can […]

Filed Under: IEEE 1588, Industry Applications, NTP

Meinberg High-Performance Sync card (HPS100)

November 25, 2019 by Andreja Jarc Leave a Comment

Five Minute Facts About Packet Timing By Andreja Jarc. Those of you who know Meinberg may have noticed that Meinberg typically does not talk about licenses. The reason for this is, that Meinberg, in most cases, does not charge you extra for enabling specific features or functions. With our free lifetime support and firmware update […]

Filed Under: IEEE 1588, NTP Tagged With: High-performance synchronization

Use Cases for Timing in Power Grids

July 16, 2019 by Andreja Jarc Leave a Comment

Five Minute Facts About Packet Timing By Andreja Jarc. Evolution of Grids The power grid has been operating for a long time, long before data networks and ethernet systems were popular. It is one of the world’s largest infrastructures and also one of the most robust one. Therefore, one might ask, why are we not […]

Filed Under: IEEE 1588, Industry Applications, NTP Tagged With: SCADA, Smart Grids, Synchrophasors, Syncronization

Sync Monitor for PTP Networks: How does it work?

May 13, 2018 by Andreja Jarc Leave a Comment

By Andreja Jarc. Meinberg introduced a new monitoring tool called Sync Monitor, which is available in all Meinberg LANTIME Systems with firmware 6.22 or later. Sync Monitor is used for monitoring the performance of NTP or PTP nodes in your network and can be accessed via the web interface. Moreover, it also enables monitoring of […]

Filed Under: IEEE 1588, Industry Applications, NTP

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