Precision Timing for Reliable Power.  Simplified.
Events web page with magnifying glass


What to Specify—Key Points:

  • All EPMS device clocks shall be sync'd within 100 µs.
  • EPMS devices shall be sync'd using PTP (IEEE1588) protocol over Ethernet.
  • The first SER device shall serve as PTP Master, all other SERs shall sync automatically via PTP.
  • EPMS devices without PTP shall be sync'd via legacy protocol from a PTP-enabled SER.
  • The Simple PTP Profile shall be used so that no special 1588 switches are required to maintain the specified accuracy.
  • Each SER device shall provide an embedded web interface for monitoring of status and events using a standard web browser.
  • [OPTIONAL] Each SER device shall output a signal to trigger a waveform capture by a power meter, coincident with any event.
  • [OPTIONAL] A GPS antenna and clock shall be supplied to provide an accurate time reference traceable to UTC.
  • [OPTIONAL] The EPMS software shall include native drivers for SERs plus analysis and reporting for root cause analysis.

For an editable copy (Word doc) of a complete guide spec, please click:

SER Guide Spec (doc) Word doc file


Resources for Specifying Engineers

Precision time synchronization of power system devices over Ethernet using PTP (IEEE 1588) is now commonplace, especially for modern critical power projects.   If you are new to this topic, or haven't studied it for a while, the amount of technical information may seem overwhelming.   To help, we've organized links to key information in the 3-step "guided tour" below.   Once you've got what you need, then browse more reference materials at right, visit our Technical Library for a complete list of all documents, or call or email us for more details or a presentation just for you.


To understand what we mean by precision time sync and learn why it's important, start with the documents below.

Handout: Sequence of Events Recording (SER) overview of SER
DataSheet: Power Management in High Definition data sheet
Data Sheet CyTime SER-3200/2408 Event Recorders data sheet
Presentation: PTP-Enabled SER presentation

For more on CyTime SER-3200/2408

2—In-Depth Technical

Next view the documents below to understand how PTP (per IEEE 1588) changes everything—and see how PTP makes SER systems simple, affordable and scalable.

Tech Note: Hi-Res Time-Sync via PTP (1588) pdf file
Tech Note: SER System Design Guide pdf file
Tech Note: SER Device Selection Guide pdf file
Tech Note: Measuring Breaker Opening Times with CyTime SER pdf file

For more on Precision Time Protocol (PTP)

3—Additional Resources

Completing the tour, please click on any of the resources below to help you specify the latest technology for your projects now.

SER Guide Spec (doc) Word doc file
SER Guide Spec (pdf) pdf file
Online Demo: SER-3200 CSI site link
Frequently Asked Questions (FAQs) CSI site link

Visit the Technical Library (including Images)

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