Five Minute Facts About Packet Timing By Andreja Jarc. Synchronization in Power Networks There are a few different timing technologies which are used for synchronization in power grids. Traditional power systems use IRIG-B which can deliver from 1 us to a few micro seconds accuracy, depending on whether you are using the TTL or AM […]
Trusted Source Mode
By Andreja Jarc. In the latest release of our LANTIME firmware 6.24 you can find a new feature called Trusted Source. This additional functionality is much awaited by everyone who is looking for a method that will help to mitigate vulnerabilities of the GPS signal. Anomalies in the GPS timing caused by unfriendly signal spoofing […]
Time of Day, Phase and Frequency – select your source
By Andreja Jarc. Time can mean many things. For purpose of synchronization, we are trying to determine a sequence of events or we want to compare how long an event lasts. Usually we are talking about the Time of Day (ToD), which represents a “wall clock time” – a specific time with hours, minutes, seconds […]
Multi Reference Clock – IRSA
By Andreja Jarc. You have probably already heard about a Multi Reference Clock Source from Meinberg, commonly referred as an MRS. What is it about? This is a receiver that can use other input signals in addition to GNSS to synchronize the system. Therefore its name: Multi- Reference- Source. The reference signals commonly used may […]
The Art of Negotiation, the PTP Way
Five Minute Facts About Packet Timing By Doug Arnold and Andreja Jarc A previous post discussed unicast PTP. Most PTP Profiles are based on multicast communication. However, PTP can operate using unicast. This is necessary in networks which don’t support multicast, or if there is a large number of PTP slaves, which would generate too […]
Testing various PTP setups
By Andreja Jarc. This time I prepared some experiments with different IEEE 1588 / PTPv2 configurations where the accuracy of the end device was measured for each test case. In all Test cases a Meinberg M500 IMS (modular platform in a railmount formfactor) was used as Grandmaster (GM) and a Meinberg SyncBox as a PTP slave. Subsequently […]
NTP Security and Protection
By Andreja Jarc. Synchronized timing is vitally important when many systems work together in a network. Services such as Logfiles, Correlation of Events, User Authentication Mechanisms, Job Scheduling e.g. for backups or Active Directories running on distributed platforms use accurate timestamps to record events in chronological order and to avoid conflicts with data replication. Without […]
Leap Second Test
By Andreja Jarc. The timing industry is anxiously waiting for the unavoidable Leap Second Insertion which is announced for this year on June 30, 2015 at UTC midnight. The Leap Second has been introduced by The International Earth Rotation Service (IERS) in order to keep up the relationship between the UTC time and the Earth […]
NTP Monitoring
By Andreja Jarc. Introduction Meinberg LANTIME servers with a fw 6.17.004 or higher are enhanced with a new NTP monitoring feature. This feature enables monitoring of NTP performance of up to 100 external NTP nodes (servers and clients) attached in a local or public network. NTP values, such as offset, delay and jitter are queried regularly from […]
Hands-on tutorial on PTPv2
By Andreja Jarc. At this time I will grant you a short summer break from all the theory 🙂 and we will do some hands-on refreshment instead! Let’s check if PTP messages between a GM (Grandmaster) and a slave clock both configured with the Default profile are transferred smoothly. For this purpose attach a laptop […]