Synchronization in Cable Networks
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The document discusses synchronization in cable networks, focusing on the need for higher accuracy in distributed access architectures (DAA) and the role of the Precision Time Protocol (IEEE 1588 PTP) for achieving reliable timing. It outlines various synchronization solutions and requirements, emphasizing the importance of cost-effective grandmaster options for remote PHY devices (RPDs). The content is confidential and highlights the ongoing testing and development of these synchronization technologies.
Synchronization in Cable Networks
- 1. Synchronization in Cable Networks June, 2017
- 2. © 2017 ADVA Optical Networking. All rights reserved. Confidential.2 • Legacy CMTS: • Synchronization from headend by QAM symbol rate and time-stamped messages • Moderate DOCSIS timing requirement • Emerging DAA • Need for synchronization of remote PHY device (RPD) • Relaxed sync requirements for residential (100µs … few ms) • Stringent requirements for precision timing services for MBH among others (sub µs) Synchronizing Distributed Access Architectures Motivation DAA demands additional synchronization means and higher accuracy
- 3. © 2017 ADVA Optical Networking. All rights reserved. Confidential.3 General Synchronization Requirements IEEE 1588 PTP for cost-efficient synchronization from central grandmaster User Access Network Headend Precision Time Protocol IEEE 1588 - PTP FiberCoax CMTS Grandmaster (GM) Towards D-CCAP DOCSIS Timing Protocol (DTP)Cable Modem (CM) DOCSIS DTP NTP Distri- buted CCAP Connectivity Network Connectivity Network GM Fiber Node Cable Modem (CM) PTP is transported over IP unicast (G.8275.2 PTP Profile ) RPD
- 4. © 2017 ADVA Optical Networking. All rights reserved. Confidential.4 Precision Time Protocol IEEE 1588 - PTP Future: Precision Timing Services • Connectivity network provides boundary clock functionality for high quality synchronization distribution • Central grandmaster is sourced from highly accurate primary reference time clock (PRTC) with UTC traceability through GNSS • Cable modem translates DOCSIS timing protocol (DTP) back into PTP A sophisticated synchronization solution is required for high-precision timing DOCSIS DTP Distri- buted CCAP Connectivity Network GM and PRTC GNSS – Global Navigation Satellite System BC BC – Boundary ClockRPD Cable Modem (CM) PTP
- 5. © 2017 ADVA Optical Networking. All rights reserved. Confidential.6 RPD Solutions for Any Timing Requirement Sync excellence in cable networks with Oscilloquartz expertise and products Cable Modem (CM) DOCSIS DTP BC – Boundary Clock OC - Ordinary Clock Centralized GM (Option 1) BC Edge GM (Option 2) On-site GM (Option 3) OSA 5401 SFP-Based GM, SyncE OSA 5420 Series Edge/Core GM, PR(T)C, SyncE OSA 5405 On-site GM, SyncE Distri- buted CCAP OC OC OSA 5410 Series Edge GM, PR(T)C, SyncE
- 6. © 2017 ADVA Optical Networking. All rights reserved. Confidential.7 • Cost-effective IEEE 1588 grandmaster for up to 1024 RPD • G.8275.2 and G.8275.1 PTP profiles • Hardware timestamping for +/- 100nsec phase accuracy from UTC • Optional GPS/GNSS • Support for PTP and management over IPv6 • Multiple fiber/copper SFP 100M/1G OSA 542x Synchronizes Cable Networks Perfectly Sized for DAA Successful interop test with several RPDs at Excentis; CableLabs testing on-going OSA 5420 Series – Multi- Technology PTP Grandmaster, NTP Server, GNSS Receiver
- 7. © 2017 ADVA Optical Networking. All rights reserved. Confidential.8 • PTP timing for digitized RPD • Various options for sync distribution and assurance • Moderate DOCSIS timing versus highly accurate precise timing services • Need for well designed sync solution Sync Summary D-CCAP Demands New Timing Specific expertise needed for precise, reliable and manageable timing delivery
- 8. 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. Thank You