By Andreja Jarc. In a previous post I introduced tests with different IEEE 1588 / PTPv2 configurations where the PTP accuracy of the slave device was measured for each test case. The test cases performed were as follows: A direct link between GM and Slave as a baseline reference accuracy measurement. A 100 Mbit/s Boundary Clock […]
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 […]
Saving electrical power in railway grids
By Andreja Jarc. The production and demand of electrical power must be the same at all times for stability and optimal operation of railway power grids. If there is too much power it will dissipate as heat or cause an over load at a transform station with a damaging result. On the other hand, not having […]
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 […]
PTPv2 Configuration over a Web Interface
By Andreja Jarc. In my last post I promised to show you how to configure the IEEE 1588 Default Profile on a grandmaster (GM) via a web interface. This is what we will do right now. We will use the same PTP master device M600/GPS/PTP from Meinberg with V6 firmware as we did in the […]
Let’s configure the IEEE 1588 Default Profile
By Andreja Jarc. The theory on IEEE 1588 PTP its functions and features have been extensively covered in our previous blog posts. To refresh your knowledge you can refer here. As you may have noticed the PTP environment is exceptionally complex due to its flexible design to solve sync problems of many diverse applications in wide […]
Measuring Asymmetric Delay in the networks
By Andreja Jarc. Finally good news on the subject of measuring asymmetric delays in LAN and WAN networks using packet timing technologies. Meinberg Radioclocks provides a reliable solution for measuring asymmetry in NTP as well as IEEE 1588 PTP environments using a LANTIME server equipped with a Multi Reference Source (MRS) receiver. MRS is a special reference clock which […]