Five Minute Facts About Packet Timing By Doug Arnold. In an earlier post I described how boundary clocks and transparent clocks correct for timing errors in the network between the PTP grandmaster and PTP slaves. But what do you do if you don’t have boundary clocks or transparent clocks? What if you have a bunch […]
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 […]
Telecom Profile With Full On-Path Support
Five Minute Facts About Packet Timing By Doug Arnold. A while back I posted about the Telecom Profile for Frequency Synchronization, or ITU-T G.8265. In the view of the International Telecommunications Union (ITU), frequency was all they could promise with this profile since it assumed that there was no on-path support. In other words the […]
Time Synchronization Requirement for Synchrophasers
Five Minute Facts About Packet Timing By Doug Arnold. The IEEE Standard for Synchrophaser Measurements for Power Systems (IEEE C37.118.1 -2011) recommends that phase measurement equipment in power systems by synchronized to UTC to within 1 μs. That is fairly strict timing requirement for a system that deals with voltages and currents at the low frequencies […]
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 […]
The PTP Telecom Profile for Frequency Synchronization
Five Minute Facts About Packet Timing By Doug Arnold. The Precision Time Protocol Telecom Profile for Frequency Synchronization was created by International Telecommunication Union, or ITU, for the transferring precise frequency through a packet switched network which does not have any support for PTP. Don’t let the name fool you though, you can transfer time […]
Unicast PTP
Five Minute Facts About Packet Timing By Doug Arnold. So far in this column we have talked about multicast PTP. Multicast is clearly critical to the working of the standard Best Master Clock Algorithm, since all the clocks need to discover who the possible master clocks in order to pick the best. However, some applications need unicast […]
Using SNMP to Manage Network Time Servers
By Andreja Jarc and Doug Arnold. The Simple Network Managment Protocol Most network connected devices support a number of management options including the Simple Network Management Protocol, or SNMP. SNMP is a network protocol which allows a single network management system to monitor a large number of devices on the network. Indeed this is one […]