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ePRTC in data centers - GNSS-backup-as-a-service (GBaaS)

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ePRTC in data centers - GNSS-backup-as-a-service (GBaaS)

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Accurate timing is essential for effective operations in today’s data centers. An ePRTC synchronization source can offer the levels of precise synchronization required and remove vulnerability to GNSS outages. With the latest optical timing channel (OTC) technology, PTP-optimized optical transport can be used to distribute accurate timing all the way from the core of the network to the edge. What’s more, this can be delivered through GNSS/GPS-backup-as-a-service (GBaaS), whereby a specialized service provider operates a robust and reliable network, supplying precise and secure timing as a backup to highly vulnerable GNSS. In his ITSF 2022 presentation, Igal Pinhasov explored the value of utilizing GBaaS to provide accurate time for data centers using optical timing channel technology over long distances.

Accurate timing is essential for effective operations in today’s data centers. An ePRTC synchronization source can offer the levels of precise synchronization required and remove vulnerability to GNSS outages. With the latest optical timing channel (OTC) technology, PTP-optimized optical transport can be used to distribute accurate timing all the way from the core of the network to the edge. What’s more, this can be delivered through GNSS/GPS-backup-as-a-service (GBaaS), whereby a specialized service provider operates a robust and reliable network, supplying precise and secure timing as a backup to highly vulnerable GNSS. In his ITSF 2022 presentation, Igal Pinhasov explored the value of utilizing GBaaS to provide accurate time for data centers using optical timing channel technology over long distances.

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ePRTC in data centers - GNSS-backup-as-a-service (GBaaS)

  1. 1. ePRTC in data centers GNSS backup as a service (GBaaS) Igal Pinhasov, VP, products, Oscilloquartz, ADVA ITSF 2022
  2. 2. © 2022 ADVA. All rights reserved. 2 Time sync in data centers Common time across distributed data centers is achieved by using GNSS as common reference + NTP/PTP within the data center Data center - Paris GNSS TC/BC GM Data center - Madrid TC/BC GM
  3. 3. © 2022 ADVA. All rights reserved. 3
  4. 4. © 2022 ADVA. All rights reserved. 4 So we heavily rely on GNSS - but it is vulnerable GNSS for timing Jamming and spoofing Obstruction Interference with transmitters at adjacent bands Ionospheric disturbance, solar activity GNSS segment errors
  5. 5. © 2022 ADVA. All rights reserved. 5 Solution: mitigation using ePRTC implementation ePRTC G.8272.1 : Time error +/-30nsec vs UTC (locked) Time error +/-100nsec vs UTC in 14 days of holdover GNSS Cs clock Combiner function of ePRTC ePRC-A G.811.1 Cesium atomic clock PTP Packet Master Clock ePRTC combiner + PTP GM
  6. 6. © 2022 ADVA. All rights reserved. 6 ePRTC lock and holdover results Full 65-day run ePRTC full lock 3 day learning Start holdover 34 days holdover 22 days normal ePRTC operation GNSS reconnect 6 days (normal op’) TE within +/-20nsec in locked mode 40nsec of phase drift in 34 days of holdover 12nsec of phase drift in 14 days of holdover
  7. 7. © 2022 ADVA. All rights reserved. 7 Holdover result for 50 days Days Days
  8. 8. © 2022 ADVA. All rights reserved. 8 Option 1 : ePRTC in the data center Cesium atomic clock ePRTC combiner + PTP GM with HW redundancy TC/BC TC/BC TC/BC TC/BC PTP/NTP PTP/NTP PTP/NTP +/-30nsec +/-100nsec
  9. 9. © 2022 ADVA. All rights reserved. 9 Option 2 : GNSS backup as a service (GBaaS) Core time base network Single-digit number of locations for large operator ePRTC enabled, TE ≤ ±30ns Aggregation network Hundreds of locations for large network PRTC enabled, TE ≤ ±100ns Feeders to end application Thousands of locations for large network Optical timing channel (OTC) Optical timing channel with PTP BC class D 70ns budget ePRTC 30ns budget IEEE 1588 PTP OTC+ BC Datacenters
  10. 10. © 2022 ADVA. All rights reserved. 10 Time distribution : 9xBC Class D Test setup: 9 x Class D BCs and 370km of fiber (single fiber) Each BC class D (G.8273.2) adds up to 5nsec of max|TEL| Single fiber 50 km Tx: 1615 Rx: 1605 Rx: 1615 Tx: 1605 652.D Rx: 1615 Tx: 1605 Rx: 1615 Tx: 1605 Rx: 1615 Tx: 1605 Tx: 1615 Rx: 1605 Tx: 1615 Rx: 1605 Tx: 1615 Rx: 1605 A3 A3 A4 A3 A4 A3 A4 50 km 652.D 45 km 652.D 50 km 652.D 45 km 652.D 50 km 652.D 40 km 652.D 40 km 652.D N1 N2 N2 N1 N2 N1 A2 N1 A4 GNSS antenna 2 m Tx: 1615 Rx: 1605 Tx: 1615 Rx: 1605 Rx: 1615 Tx: 1605 Tx: 1615 Rx: 1605 Tx: 1615 Rx: 1605 Rx: 1615 Tx: 1605 Rx: 1615 Tx: 1605 Rx: 1615 Tx: 1605 G8275.1 + SyncE A3 A1 P2 slave 2 m P1 master 2 m SFP/GRAY SFP/GRAY SFP/GRAY High accuracy Tester SFP/GRAY BC_1 BC_2 BC_3 BC_4 BC_5 BC_6 BC_7 BC_8 BC_9
  11. 11. © 2022 ADVA. All rights reserved. 11 Time distribution : 9xBC Class D Test results: 9 x Class D BCs and 370km of fiber meets ITU-T G.8272 requirements for PRTC-A clock TE +/-20nsec MTIE TDEV
  12. 12. © 2022 ADVA. All rights reserved. 12 Optical line system Intermediate site Node without OTC Terminal west Terminal east Payload traffic Line terminal The extract length of each of the fibers is unknown The different between length of fibers can be just a few tenths of a meter over long-distance connections -> creating significant asymmetry (~3nsec/m) The inline amplifiers are directional and add unknow delay, which varies between generation of amplifiers, types and suppliers
  13. 13. © 2022 ADVA. All rights reserved. 13 Optical line system Intermediate site Node with OTC Terminal west Terminal east PTP over optical timing channel Payload traffic Timing device featuring High accuracy PTP boundary clock type D BiDi transceivers Line terminal
  14. 14. © 2022 ADVA. All rights reserved. 14 Impact of chromatic dispersion can be efficiently compensated Same east-west wavelength Asymmetric delay results in a deterministic time error Chromatic dispersion creates asymmetric delay 100km of fiber with dispersion of 18ps/(nm km) l1 = 1.605µm l2 = 1.615µm 𝑐𝑇𝐸 ≈ 100𝑘𝑚 2 10𝑛𝑚 18𝑝𝑠 𝑛𝑚 𝑘𝑚 = 9000𝑝𝑠 = 9𝑛𝑠 50km 65km 50km 65km Constant and deterministic
  15. 15. © 2022 ADVA. All rights reserved. 15 50KM_a OSC OSC OSC OSC OSC Paragon Neo BC 5WCA OTC patch-through Master port slave port OSC OTC accuracy measurment 3GU/1605L GBE/1615V 3GU/1605L SFP/GBE/1605V GBE/1615V GBE/1615V 50KM_b 65KM_a 65KM_b BC GBE/1310 GBE/1310 210 cm |TE| within15nsec. |cTE| within 5nsec. Known (fixed) asymmetry is configured on the BC port
  16. 16. © 2022 ADVA. All rights reserved. 16 Summary • Data centers require stringent phase and time synchronization • “GNSS everywhere” is subject to GNSS vulnerabilities (jamming /spoofing, etc.’) • ePRTCs can be used to mitigate these risks • Sub-100nsec accuracy can be delivered from core ePRTC sites to data centers sites using optical timing channel combined with BC class D ePRTC and GBaaS enable robust synchronization in data centers
  17. 17. Thank you IMPORTANT NOTICE ADVA 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 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. info@adva.com

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