Timing and sync requirements in railway networks
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The document outlines advancements in synchronization and timing solutions for railway networks, highlighting the importance of digitalization and modernization to enhance rail transport efficiency without additional track infrastructure. It discusses new synchronization technologies, the integration of 5G communication, and the transition from outdated systems to more resilient architectures. Key objectives include improving timekeeping accuracy and network reliability to support increased train operation effectiveness.
Timing and sync requirements in railway networks
- 1. Time and sync requirements in railway networks Mario Arnold, synchronization network engineering at DB Netz AG Jörg Urban, AVP BD at Oscilloquartz, ADTRAN SE • Deutsche Bahn Netz
- 2. 2023 © ADTRAN, INC Confidential The future of mobility is rail • Digitalization, automation and artificial intelligence (AI) are key to a higher capacity and optimal utilization of the rail network. Our goal is clear: more attractive rail transport with more trains, of higher quality. And all without adding a single meter of new track. Modernizing Faster, greener, smoother: thanks to Digitale Schiene Deutschland European Train Control System (ETCS)
- 3. 2023 © ADTRAN, INC Confidential Rail sector in transition • Modernization • Old SSUs replaced with new sync technology • SDH to packet network, support for E1 and SyncE • NTP and PTP … • New 5G comm technology for rail operation • Future Railway Mobile Communication System / Europe • https://uic.org/projects/future-railways-mobile-communications-systems-solutions • Needed to replace obsoleted GSM-R / ETCS • Digitalization/Big Data • Positioning enables efficiency rail track operation • IoT • Predictive maintenance • Smart power grid • Renewable and decentralized energy supply/production MODERNIZATION OF THE IT/TELECOM INFRASTRUCTURE INCL. SYNCHRONIZATION
- 4. 2023 © ADTRAN, INC Confidential SLA enabling sync architecture for mission-critical communication networks The new timing and sync solution Highly accurate and redundant timekeeping, distribution and assurance Core network Ensemble of highly precise and accurate ePRTCs < +/-30ns to UTC ePRTC Aggregation/access network COs enabled to provide time information to variety of consumers Better +/- 100ns (PRTC-A), 40ns (PRTC-B) 4G / 5G Versatile edgeSync Versatile edgeSync Enterprises/wholesale Applications Better +/- 1000ns to UTC Sync network and service management Smart grid Time over optical transport Secure and highly accurate time distribution MEC / DC L2/TSN/L3 Fiber/WDM/MW Access network ePRTC ePRTC Time/phase Peering
- 5. 2023 © ADTRAN, INC Confidential Modernization of sync network (High-level sync design) Objective: Highly resilient sync architecture at any Deutsche Bahn ‘Netz’ site, GNSS jamming and spoofing agnostic
- 6. 2023 © ADTRAN, INC Confidential • SDH, still in use for the next 15 years • > 5.000 SDH nodes • Rail track operation (monitoring and control) • GSM-R, voice and data services • DWDM & IP/MPLS for each • ITC services • Enable 5G rollout replacing GSM-R • Migration of SDH/PDH-based rail track operation The network – points of presence (PoPs) 6
- 7. 2023 © ADTRAN, INC Confidential 7 The SDH sync structure 7 ‘Clusters’ add redundancy (3 – 4 areas) 52 PRC areas 15 PRC clusters
- 8. 2023 © ADTRAN, INC Confidential • PRC/SSU for E1/SyncE, PTP and NTP application • PRTC-B capable device • Performance management capabilities • T-BC Class C/D support • High E1 and Ethernet fan-out • Highly redundant – clock module, PSU & port • Future-proof with (cn/e)PRTC • Less power consumption • High system uptime • Design approach – simplified architecture and device config. Versatile edgeSync requirements
- 9. 2023 © ADTRAN, INC Confidential • PTP G8275.1 and SyncE over 1G OTN links • Max 2 OTN hops, typical measurements, maxTE of 5ns • For monitoring use the internal measuring function • A link outage on DWDM/OTN causes phase hits! • DWDM network to transport phase/time via OTN edgeSync device monitoring and backup 9
- 10. 2023 © ADTRAN, INC Confidential • Typical measured maxTE 60ns on monitored PRTC (configuration: GNSS vs PTP input from cnPRTC) Measurement results 10 • PRTC monitoring – 2
- 11. 2023 © ADTRAN, INC Confidential 11 Introducing ePRTC at core sites
- 12. 2023 © ADTRAN, INC Confidential • (cn)ePRTC cluster at each core site • 2x ePRTCs each connected to 2x Cs clocks • Interconnection with 10MHz over optical fiber • 2x dedicated T-BC / Class D devices • PTP G8275.1 and SyncE input over optical fiber • Distribution of PTP G8275.1 & SyncE over 1G-OTN • Interconnect UTC(DT) and UTC(PTB) for research purposes • At 2 core sites in each location (Frankfurt and Berlin) (cn)ePRTC setup
- 13. 2023 © ADTRAN, INC Confidential • edgeGM & T-BC at 5G switch hub (grooming of 5G RRU) • OTN being used to transport PTP/SyncE, G8275.1 • Plan to build own time scale • Time sync of 5G radio and application Next … 13 The intended timeline for the introduction of FRMCS by DB and an overview of the various steps taken, (03 / 2022)
- 14. 2023 © ADTRAN, INC Confidential • We can’t know what we don’t measure • Synchronization networks require accurate planning • Internal knowledge transfer about synchronization is necessary • Keep it simple and stupid (KISS) principle – Perfect is when you can't leave anything out Takeaways 14
- 15. 2023 © ADTRAN, INC Confidential Thank you For questions please contact: mario.arnold@deutschebahn.com or joerg.urban@adtran.com