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 […]
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 […]
The IEEE 1588 Default Profile
Five Minute Facts About Packet Timing By Doug Arnold. As we’ve seen in previous posts, PTP has many optional features, and often more than one way to do things. This is what gives PTP its awesome flexibility to cover so many different kinds of applications. There is however a dirty secret behind this power: PTP […]
NTP vs PTP: Network Timing Smackdown!
Five Minute Facts About Packet Timing By Doug Arnold. I get asked a lot of questions from customers about network timing technology. Some of them are challenging to answer. However, one that I get all the time that is easy to answer is this: “Do I want NTP or PTP?” It all comes down to […]
What Makes a Master the Best?
Five Minute Facts About Packet Timing By Doug Arnold. This is a very brief introduction to the Best Master Clock Algorithm. For a more detailed description refer to the more detailed post: BMCA Deep Dive. A key to the resiliency of the Precise Time Protocol is the Best Master Clock Algorithm, or BMCA. The BMCA […]
One-step or Two-step?
Five Minute Facts About Packet Timing By Doug Arnold. One-step or two-step clocks for IEEE 1588? This is a question I hear a lot. If you are designing PTP enabled equipment, then it is a question, which has important ramifications for the architecture of your device. However, if you are buying PTP enabled equipment and […]
What Are All Of These IEEE 1588 Clock Types?
Five Minute Facts About Packet Timing By Doug Arnold. If you are new to the exciting world of IEEE 1588, or even if you are not, you might find yourself confused by all of the different types of clocks. I’ve heard and seen the following terms used related to PTP:
Tales from the ISPCS Plugfest
Five Minute Facts About Packet Timing By Doug Arnold. I recently got back from the ISPCS Plugfest. If you don’t know what this is, 33 organizations came together for three days in Lemgo, Germany to test interoperability of their IEEE 1588 enabled equipment. The annual event is part of the International Symposium on Precision Clock Synchronization […]