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Optical timing channel (OTC) solution delivers new levels of network synchronization

Our OSA 5412 and 5422 address key timing challenges for a wide range of industries by bringing new levels of synchronization accuracy and resilience to edge and access networks. Featuring multi-band GNSS receivers for nanosecond accuracy and able to support eight field-upgradeable 10Gbit/s ports, they provide the enhanced capabilities needed for next-generation applications such as 5G.

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Optical timing channel (OTC) solution delivers new levels of network synchronization

  1. 1. Optical timing channel (OTC) solution delivers new levels of network synchronization End-to-end technology uses PTP-optimized optical transport channels for ultra-precise timing
  2. 2. © 2020 ADVA. All rights reserved.22 Availability of GNSS might be compromisedGNSS is applied in many networks Accurate timing is essential for critical infrastructure Challenges with satellite-delivered timing Mobile radio networks Financial trading Digital cable networks Power utilities Data center infrastructure Broadcast networks GNSS for timing Jamming and spoofing Obstruction Interference with TV, cellular, radar, µwave Ionospheric disturbances, solar activity GNSS antenna not installed properly
  3. 3. © 2020 ADVA. All rights reserved.33 Migrating towards a future-proof sync architecture Higher availability Better accuracy Adding ePRC, ePRTC at core ADVA OTC technology delivers accurate timing over DWDM networks High-performance sync overlay Optical timing channel (OTC), boundary clocks class D
  4. 4. © 2020 ADVA. All rights reserved.44 Timing device OTC regen ILA ROADM Terminal Cross-connect Terminal / ADM card Optical timing channel (OTC) Our optical timing channel (OTC) solution achieves high-accuracy time distribution by PTP (IEEE 1588) via Gigabit Ethernet over dedicated wavelengths on a single fiber OTC has minimal constant link asymmetry due to bidirectional transmission on a single fiber; further compensation is supported OTC is independent from other layers (IP, Ethernet, OTN, reconfigurable optical layer) practically eliminating dynamic time errors OTC does not change optical network engineering rules and is just an overbuild to the optical transport layer
  5. 5. © 2020 ADVA. All rights reserved.55 OpticallinesystemIntermediatesite Node with timing access Terminal west Terminal east PTP and SyncE over optical timing channel Payload traffic High-accuracy timing device featuring PTP boundary clock type D BiDi transceivers OTC provides ample optical budget: Up to 30dB between two BiDi transceivers Dispersion is irrelevant at GbE line rate Line terminal
  6. 6. © 2020 ADVA. All rights reserved.66 Bidirectional transceivers Standard transceivers Two CWDM slots per bidirectional channel Standard transceivers have two fiber connectors (Tx and Rx) CWDM slot Tx CWDM slot Rx One CWDM slot per bidirectional channel Bidirectrional transceivers have one fiber connector with Tx and Rx pre-multiplexed in the transceiver Bidirectional transceivers CWDM slot Tx Rx OTC Running on the same fiber, forward and backward paths have exactly the same length; there is only marginal asymmetric delay
  7. 7. © 2020 ADVA. All rights reserved.77 Impact of chromatic dispersion can be efficiently compensated Same east-west wavelength Alternating 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 85km 65km70km 82km Time error from chromatic dispersion: 27.2ns 85km 65km70km 82km Time error from chromatic dispersion: 2ns
  8. 8. © 2020 ADVA. All rights reserved.88 PTP GM/BC type D and slave NTP server SSU/CCePRTC/PRTC-A/B Sync probe G.8265.1 EnterpriseG.8275.2 G.8275.1 2G/3G/ 4G/5G FDD BS DOCSIS 3.1 MiFID II 5G-NR/LTE TDD/LTE-A BS NTP61850-9-3/ C37.238 Smart grid OSA 54XX – Synchronization “Swiss Army knife“ OSA 542X OSA 5430 OSA 5440
  9. 9. © 2020 ADVA. All rights reserved.99 Ensemble management suite is designed to cover the complete ADVA/OSA portfolio Ensemble management with Ensemble Sync Director FCAPS management, abstraction and network control Open NBI Ensemble Controller Ensemble Packet Director Ensemble Optical Director Ensemble management client Optical transport Packet network Fiber assurance / ALM Ensemble Fiber Director Ensemble Sync Director Sync Supports SyncE and PTP for frequency, phase and time synchronization Logical, topological, nodal view of timing delivery Manages transport and synchronization network Highlights active/backup clock streams, identifies timing loops Unique SyncjackTM framework for synchronization assurance Synchronization network health indication GNSS assurance – jamming and spoofing detection Ensemble Sync Director
  10. 10. © 2020 ADVA. All rights reserved.1010 Logical sync map Topological sync map Node internal sync map Logical, topological and nodal views simplify operations and minimize configuration faults Fully transparent synchronization delivery Frequency Time
  11. 11. © 2020 ADVA. All rights reserved.1111 GNSS assurance Enables customer to identify sites with GNSS troubles or potential issues based on: • Actual geographical position (e.g., physical obstacles) • Comparison to neighboring sites • Changes in number of used vs. visible satellites • Detection of “dead spots” of satellites reception • Correlation with PMs, alarms/TCA and other events from the network • Alarms generated by machine-learning method • Jamming and spoofing detection Helps to set GNSS receiver configuration for optimal results Secure solution for on-premises data collection, storage and processing Benefits
  12. 12. © 2020 ADVA. All rights reserved.1212 OTC builds on ADVA expertise in synchronization, optics and packet networking Precise synchronization over the ADVA optical timing channel solution Summary • Mitigates GNSS shortcomings and vulnerabilities • Precisely compensates asymmetric delay caused by dispersion in optical transport • Accurate timing delivery with high-accuracy class D boundary clocks • Highest availability with fully redundant synchronization devices and independent timing sources
  13. 13. Thank you IMPORTANT NOTICE The content of this presentation is strictly confidential. 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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