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Hybrid Mode PTP: Mixed Multicast and Unicast

August 11, 2016 by Douglas Arnold 6 Comments

Five Minute Facts About Packet Timing By Doug Arnold. Quiet! Such is the lament of a PTP slave in a delay request – delay response PTP network. A slave port needs to receive Sync and Announce messages from a master port, and it needs to send Delay_Request messages and receive the corresponding Delay_Responses. If the […]

Filed Under: IEEE 1588

PTP in networks without timing support

March 11, 2016 by Douglas Arnold 1 Comment

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 […]

Filed Under: IEEE 1588, Industry Applications

Telecom Profile With Full On-Path Support

May 8, 2015 by Douglas Arnold 6 Comments

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 […]

Filed Under: IEEE 1588

Time Synchronization Requirement for Synchrophasers

August 29, 2014 by Douglas Arnold Leave a Comment

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 […]

Filed Under: IEEE 1588, Industry Applications

The PTP Telecom Profile for Frequency Synchronization

May 23, 2014 by Douglas Arnold 3 Comments

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 […]

Filed Under: IEEE 1588

Unicast PTP

April 16, 2014 by Douglas Arnold 8 Comments

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 […]

Filed Under: IEEE 1588

Using SNMP to Manage Network Time Servers

February 17, 2014 by Douglas Arnold 9 Comments

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 […]

Filed Under: IEEE 1588, NTP

The IEEE 1588 Default Profile

January 9, 2014 by Douglas Arnold Leave a Comment

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 […]

Filed Under: IEEE 1588

NTP vs PTP: Network Timing Smackdown!

November 22, 2013 by Douglas Arnold 27 Comments

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 […]

Filed Under: IEEE 1588, NTP

What Makes a Master the Best?

November 14, 2013 by Douglas Arnold 35 Comments

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 […]

Filed Under: IEEE 1588

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