In-service synchronization monitoring and assurance
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The document discusses the importance of in-service synchronization monitoring for next-generation networks, highlighting the challenges due to dynamic network conditions and high costs associated with traditional monitoring. It introduces a cost-effective miniature sync probe that utilizes advanced technologies for accurate and remote synchronization monitoring. This solution allows for centralized management and effective troubleshooting of synchronization-related issues, which are critical for maintaining high synchronization accuracy in modern applications.
In-service synchronization monitoring and assurance
- 1. In-service synchronization monitoring and assurance WSTS May 2022 Nir Laufer, VP and PLM, Oscilloquartz
- 2. © 2022 ADVA. All rights reserved. 2
- 3. © 2022 ADVA. All rights reserved. 3 In-service monitoring of sync-critical component in NG networks Why “in-service“ sync assurance is needed • Large number of application are highly dependent on accurate synchronization • Making sure synchronization is working as designed is not a trivial task • Networks are dynamic – PDV, asymmetry and environmental conditions can affect synchronization quality • Ways to ensure proper synchronization should be integrated into sync distribution/delivery functions or accompanied by cost-effective sync assurance tools • Lab test equipment is too expansive for “in-service” installation in multiple locations • Other aspects such as power consumption and OSS should also be taken into consideration Challenges
- 4. © 2022 ADVA. All rights reserved. 4 • Which site ? • High cost : • Cost of labor (technician) • Windshield time • Cost of test equipment • The high-cost leads to limited monitoring (limited time/limited coverage) • 5G TDD base station is down due to synchronization-related issue (alarms in the BS) • Grandmaster looks healthy – seems to be issue in the sync distribution • Chain of boundary clocks – which one is faulty? Example from telecom network Challenges sending technician on site Customer use case: 5G TDD BS GM BC BC BC 5G BS ? ? ?
- 5. © 2022 ADVA. All rights reserved. 5 • Nanosecond accuracy • Low capes and opes • Managed and operated securely and remotely from centralized location The solution – miniature in-service sync probe • Low power and zero footprint in a rack Accurate Cost effective Low power/footprint Managed remotely
- 6. © 2022 ADVA. All rights reserved. 6 Latest SoC technologies enable miniature sync probe Cost-effective sync probe – separation of HW from SW Minimal HW needed for effective monitoring: • High accuracy reference (GNSS) • Time error measurement (both physical layer measurements and PTP timestamping measurements) • Good oscillator (OCXO) • PTP stack • Secured network connectivity (SSH , SCP) All the rest can be done in the “cloud” • Measurements aggregation and concatenation • Analysis and display (e.g., TE , MTIE , TDEV , two-way packet selection TE, etc.) • Reporting Miniature Sync Probe GNSS OSC TE probes PTP stack Conne ctivity TS probes
- 7. © 2022 ADVA. All rights reserved. 7 Example: miniature sync probe using SoC GNSS/PTP/SYNC-E/PPS/CLK as source GNSS/PTP/SYNC-E/PPS/CLK as reference Sync Probe on SFP
- 8. © 2022 ADVA. All rights reserved. 8 Centralized in-service sync monitoring and assurance Mini sync probe Mini sync probe Mini sync probe Mini sync probe Centralized monitoring and assurance Raw measurements
- 9. © 2022 ADVA. All rights reserved. 9 Probing a boundary clock GM BC BC BC Mini sync probe Slave NMS PTP/SyncE TE/TIE/MTIE/TDEV PTP Raw measurement
- 10. © 2022 ADVA. All rights reserved. 10 Probing a slave clock GM BC Mini sync probe Slave NMS SUT: PPS/CLK/BITS/SyncE TE/TIE/MTIE/TDEV Raw measurement
- 11. © 2022 ADVA. All rights reserved. 11 APTS network limits – ITU-T G.8271.2 • G.8271.2 specify the maximum permissible levels of phase/time error and noise at interfaces within a packet network in charge of distributing phase/time synchronization per the applications corresponding to the class 4 :1.5usec (listed in Table 1 of ITU-T G.8271). Use case Forward packet delay Reverse packet delay How to test network limits continuously?
- 12. © 2022 ADVA. All rights reserved. 12 APTS/PTS – checking network limits with sync probe • Sync probe measure the network forward and the reverse delays independently • Delay raw measurements are sent to NMS • The NMS calculate the pktSelected2wayTE and compare it to the required threshold (e.g. 1100nsec) T-GM GNSS PTP grandmaster Packet-based backhaul network First aggregation node GNSS APTS mini sync probe Common reference Calculate forward and reverse delays
- 13. © 2022 ADVA. All rights reserved. 13 Probing the network GM Mini sync probe & APTS NMS PTP pktSelected2wayTE PTP Raw measurement Network PTP
- 14. © 2022 ADVA. All rights reserved. 14 Summary • In-service sync assurance is critical part of next- generation networks which depends on high synchronization accuracy • Latest SoC technologies enable miniature sync probes • Cost-effective miniature sync probes enable network monitoring at scale from a centralized network management system • Such probing is critical to identify and troubleshoot sync related problems • Such solutions are commercially available Good things do come in small packages!
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