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SMPTE Motion Imaging Journal ( Volume: 128, Issue: 6, July 2019)
[ACTIVE]

Enhanced Redundancy of ST 2059-2 Time Transfer Over ST 2022-7 Redundant Networks

Metadata

Publisher
SMPTE — White Plains, NY, USA
Doc Type
Journal Article
Content Type
Original Research
Abbreviated Title
SMPTE Mot. Imag. J
Volume
128, No. 6, pp. 21–29
Abstract
As the SMPTE ST 2059–2 standard for accurate time transfer enters real-world All-IP Studio deployments, it is important for broadcasters and system integrators to understand how the various parameters and options of the IEEE 1588 Precision Time Protocol (PTP) profile will impact both system performance and the network architecture for all media essence based on standardized IP transports, such as the recently adopted SMPTE ST 2110 series or AES67. Given the mission-critical nature of broadcast infrastructure, fully redundant networks are becoming a mandatory requirement. While ST 2022–7 defines a media essence redundancy model for switching between multiple identical flows on a per Realtime Transport Protocol (RTP) packet basis, such as it would apply to the SMPTE 2110 suite of standards, the IEEE 1588’s assumption of constant transmission delays would be violated by this approach, thus resulting in transient errors. The IEEE 1588 Precision Time Protocol (PTP) time transfer paradigm was not designed to be switched on a per PTP message basis. Although PTP has a certain level of redundancy built into the protocol to tolerate the loss of the time reference, it cannot utilize the advantages of redundant networks to their full extent. This paper addresses how the stability and availability of time and frequency transfer for SMPTE ST 2059–2 endpoints can be improved far beyond the basic redundancy mechanism provided by PTP if they are connected via separate paths toward the network as proposed in the SMPTE ST 2022–7 standard. For maximum utilization of multiple parallel channels for time transfer, PTP implementation requires additional enhancements. The solutions presented are complemented by comparative measurements demonstrating the improvements generated by such optimized designs, which includes the presence of common transient and permanent error conditions, thus showing the advantages of fully redundant time transfer over basic redundancy mechanisms provided by PTP.
Publication Date
2019-07-01
DOI
10.5594/JMI.2019.2914964
ISSN
Print: 1545-0279 | Electronic: 2160-2492
Link
https://doi.org/10.5594/JMI.2019.2914964
Author(s)
Nikolaus Kerö
Thomas Kernen
Keyword(s)
PTP, Redundancy, ST 2022-7, ST 2059-2, Time & Sync
Copyright
© 2019 SMPTE

Bibliographic Reference(s)

  • Optimizing Large Media Networks for Highly Accurate Time Transfer via PTP [Active]
  • Efficient Monitoring of ST2059-2 Based Time Transfer Performance [Active]
  • AES67.2015 — Audio Engineering Society (AES), AES67-2015, “AES Standard for Audio Applications of Networks–High-performance Streaming Audio-over-IP Interoperability.” EXTERNAL
  • IEC.62439-3.2016 — International Electrotechnical Commission (IEC), IEC 62439-3:2016, 2016, “Industrial Communication Networks— High Availability Automation Networks—Part 3: Parallel Redundancy Protocol (PRP) and High-Availability Seamless Redundancy (HSR).” EXTERNAL
  • IEEE.STD802.1W.2001 — Institute of Electrical and Electronics Engineers (IEEE), IEEE 802.1w-2001, 2001, “IEEE Standard for Local and Metropolitan Area Networks—Common Specification. Part 3: Media Access Control (MAC) Bridges—Amendment 2: Rapid Reconfiguration.” EXTERNAL
  • IEEE.STD1588.2008 — IEEE Std 1588-2008, IEEE Standard for a Precision Clock Synchronization Protocol for Networked Measurement and Control Systems, 2008 EXTERNAL
  • A. Puhm, A. Mahmood, T. Bigler, and N. Kerö, “Synchronizing an IEEE 1588 Slave Clock Over Both Paths of a Redundant Ethernet System,” Proc. International Symposium on Precision Clock Synchronization for Measurement, Control and Communication, Stockholm, Sweden, pp. 45–50, Sept. 2016. EXTERNAL
  • A. Komes and C. Marinescu, “IEEE 1588 for Redundant Ethernet Networks,” Proc. International Symposium on Precision Clock Synchronization for Measurement, Control and Communication, San Francisco, CA, pp. 108–113, Sept. 2012. EXTERNAL
  • T. Mizrahi, “Slave Diversity: Using Multiple Paths to Improve the Accuracy of Clock Synchronization Protocols,” Proc. IEEE International Symposium on Precision Clock Synchronization for Measurement, Control and Communication, San Francisco, CA, pp. 56–60, Sept. 2012. EXTERNAL
  • International Electrotechnical Commission/Institute of Electrical and Electronics Engineering (IEC/IEEE), IEC/IEEE 61850-9-3-2016, 2016, “Communication Networks and Systems for Power Utility Automation Part 9-3: Precision Time Protocol Profile for Power Utility Automation.” EXTERNAL
  • SMPTE ST 2022-7:2013 [Superseded]
  • SMPTE ST 2059-2:2015 [Superseded]
  • SMPTE ST 2110-10:2017 [Superseded]
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Nikolaus Kerö and Thomas Kernen; Enhanced Redundancy of ST 2059-2 Time Transfer Over ST 2022-7 Redundant Networks, SMPTE Motion Imaging Journal ( Volume: 128, Issue: 6, July 2019); SMPTE, 2019. Available at https://doi.org/10.5594/JMI.2019.2914964
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Nikolaus Kerö and Thomas Kernen; Enhanced Redundancy of ST 2059-2 Time Transfer Over ST 2022-7 Redundant Networks, SMPTE Motion Imaging Journal ( Volume: 128, Issue: 6, July 2019); SMPTE, 2019. Available at https://doi.org/10.5594/JMI.2019.2914964

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Nikolaus Kerö and Thomas Kernen; Enhanced Redundancy of ST 2059-2 Time Transfer Over ST 2022-7 Redundant Networks, SMPTE Motion Imaging Journal ( Volume: 128, Issue: 6, July 2019); SMPTE, 2019. Available at https://doi.org/10.5594/JMI.2019.2914964
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<span class="citation">Nikolaus Kerö and Thomas Kernen; <cite>Enhanced Redundancy of ST 2059-2 Time Transfer Over ST 2022-7 Redundant Networks</cite>, SMPTE Motion Imaging Journal ( Volume: 128, Issue: 6, July 2019); SMPTE, 2019. Available at <a href="https://doi.org/10.5594/JMI.2019.2914964" target="_blank" rel="noopener">https://doi.org/10.5594/JMI.2019.2914964</a></span>

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Nikolaus Kerö and Thomas Kernen; Enhanced Redundancy of ST 2059-2 Time Transfer Over ST 2022-7 Redundant Networks, SMPTE Motion Imaging Journal ( Volume: 128, Issue: 6, July 2019); SMPTE, 2019
doi: 10.5594/JMI.2019.2914964
url: https://doi.org/10.5594/JMI.2019.2914964
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Nikolaus Kerö and Thomas Kernen; <cite id="bib-10-5594-jmi-2019-2914964">Enhanced Redundancy of ST 2059-2 Time Transfer Over ST 2022-7 Redundant Networks</cite>, SMPTE Motion Imaging Journal ( Volume: 128, Issue: 6, July 2019); SMPTE, 2019
<span class="doi">10.5594/JMI.2019.2914964</span>
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