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Introducing the OSA ePRTC solution


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Oscilloquartz's new enhanced primary reference time clock (ePRTC) system enables unprecedented timing accuracy and stability even when the GNSS signal is lost. The technology provides the ideal timing source for mission-critical transport systems such as utility networks, government infrastructure and radio access networks and delivers the strict synchronization needed for LTE-A and 5G applications. Featuring the OSA 3230B ePRC atomic cesium clock connected to an Oscilloquartz clock combiner and grandmaster, the new solution offers the extremely stable frequency of a cesium clock with the UTC-traceable signal provided by GNSS. What’s more, when combined with the OSA 5430, the OSA ePRTC system is the only solution available that provides full hardware redundancy and multiple fan-out options including PTP over 10Gbit/s.

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Introducing the OSA ePRTC solution

  1. 1. Introducing the OSA ePRTC solution June 2018
  2. 2. © 2018 ADVA Optical Networking. All rights reserved.22 Critical infrastructures need precise timing for rapid failure localization and efficient operation of distributed control processes Our industry requires better timing Technical innovation and regulation creates a need for precise synchronization Replication of data in globally dispersed data centers and synchronization of distributed processes need tight timing Precise timing is required for highly efficient radio access network and accurate positioning in mobile networks as well as cable networks Transactional services in finance and also security applications depend on trustworthy and precise time
  3. 3. © 2018 ADVA Optical Networking. All rights reserved.33 Synchronization requirements in mobile networks 2G/3G: frequency synchronization LTE – TDD: 1.5µs time synchronization (large cells) LTE – multicast: several µs time synchronization LTE advanced CoMP: 1µs time synchronization 5G – positioning: <100ns time sync (cluster) 5G – CA, IoT: several 100ns time sync (cluster) Fronthaul eCPRI: <100ns time sync
  4. 4. © 2018 ADVA Optical Networking. All rights reserved.44 … but requires a backup GNSS provides excellent timing accuracy … “In some sectors, the vulnerabilities of GNSS to both natural and ground-based interference, including through malicious attacks, are poorly understood. In others, there is insufficient protection against disruption, reducing our collective resilience to a loss of these systems.” Source: Satellite-Derived Time and Position, UK Government – Office of Science, 2018 Commercially available GNSS jamming devices:
  5. 5. © 2018 ADVA Optical Networking. All rights reserved.55 Central grandmaster distributing time from satellite-synchronized atomic clock PTP packets delivered over existing packet-based network Accuracy depends on packet delay characteristics; realistically very hard to meet sub-1µs Moderate phase and time of day synchronization from central timing source Introducing time synchronization in mobile RAN SSU Edge of mobile core Atomic clock PTP grandmaster PRTC Ethernet with SyncE IEEE 1588 PTP
  6. 6. © 2018 ADVA Optical Networking. All rights reserved.66 Distributing PRTC to network edge, ultimately locating at macro cell site Improving core PRTC towards ePRTC Adding boundary clock / transparent clock capability to packet network Different measures enhance accuracy of cell site timing Improving accuracy of time synchronization SSU Edge of mobile core ePRTC Distributing PRTC Boundary clock
  7. 7. © 2018 ADVA Optical Networking. All rights reserved.77 Emerging synchronization architecture for most stringent timing requirements Meeting most stringent timing requirements RH RH RH BBU BBU BBU Fronthaul network: full on-path support with enhanced BC and SyncE Cell sites with eRE for fronthaul timing Central BBU pool with eREC fronthaul timing and GNSS- disciplined GM Core network: full on-path support BC and SyncE Central synchronization delivery with grandmaster and ePRTC
  8. 8. © 2018 ADVA Optical Networking. All rights reserved.88 Cesium clock as time source PRC (G.811) Frequency PRC : Cs or GNSS NE NE NE PRTC (G.8272) Frequency + phase PRTC : GNSS NE NE NE ePRTC (G.8272.1) Frequency + phase GNSS NE NE NE Cs Intelligent combiner SSU Packet master clock Packet master clock Sync network Sync network Sync network SSU Packet slave clock Packet slave clock Cs as backup
  9. 9. © 2018 ADVA Optical Networking. All rights reserved.99 Cesium clock helps filtering fluctuations caused by the impact of atmospheric interference, solar storms or ionospheric variation on clock recovered from GNSS Enhanced PRTC (ITU-T G.8272.1) MTIE τ(s) 15ns 100ns 1ns 0.1 1 10 100 400k1k 10k 10ns 100k 1M 10M 100M 30ns 4ns 30ns 30 ns 100 ns 4ns GNSS Cs Intelligent combiner 30ns MTIE in GNSS-locked mode 100ns MTIE over 14 days in holdover mode (Class-A)
  10. 10. © 2018 ADVA Optical Networking. All rights reserved.101010 © 2018 ADVA Optical Networking. All rights reserved. Confidential.10 • ePRTC is significantly improving holdover performance with low added cost • OSA 54XX can work with any Cs clock improving the performance in holdover significantly ePRTC is a quantum leap in holdover capability Comparing phase stability of PRC with ePRTC 0 2000 4000 6000 8000 10000 12000 14000 14 days holdover Holdover [ns] PRC G.811 practical PRC ePRTC 70ns
  11. 11. © 2018 ADVA Optical Networking. All rights reserved.1111 Compact OSA ePRTC solution with OSA 5421 GNSS receiver Clock combiner PPS/PPS+ToD OSA 3230B ePRC cesium GNSS GNSS antenna OSA 5421 10 Mhz BITS Sync-E PTP NTP
  12. 12. © 2018 ADVA Optical Networking. All rights reserved.1212 Redundant OSA ePRTC solution with OSA 5430 GNSS Receiver Clock Combiner PPS/PPS+ToD OSA 3230B ePRC cesium GNSS GNSS antennas OSA 5430 10 Mhz BITS Sync-E PTP NTP Clock combiner GNSS receiver OSA 3230B ePRC cesium
  13. 13. © 2018 ADVA Optical Networking. All rights reserved.1313 • OSA ePRTC solution uses superior OSA 3230B cesium clock and OSA 54XX scalable grandmasters • The ePRTC’s enhanced holdover stays within +/-100nsec from UTC for two weeks, even when GNSS is lost • The solution meets highest accuracy and stability according to latest ITU-T ePRC/ePRTC specifications • The ePRTC clock combiner is integrated with the grandmaster for compact design and cost effectiveness High timing availability and best accuracy with OSA ePRTC solution Summary
  14. 14. Thank you IMPORTANT NOTICE The content of this presentation is strictly confidential. ADVA Optical Networking is the exclusive owner or licensee of the content, material, and information in this presentation. Any reproduction, publication or reprint, in whole or in part, is strictly prohibited. The information in this presentation may not be accurate, complete or up to date, and is provided without warranties or representations of any kind, either express or implied. ADVA Optical Networking shall not be responsible for and disclaims any liability for any loss or damages, including without limitation, direct, indirect, incidental, consequential and special damages, alleged to have been caused by or in connection with using and/or relying on the information contained in this presentation. Copyright © for the entire content of this presentation: ADVA Optical Networking.