Synchronization in Cable Networks

Oscilloquartz's comprehensive portfolio of synchronization products, enables precise network timing to be implemented in the most flexible, reliable and manageable way. The latest extension of the product series makes this possible in cable networks. The OSA 5420 is a new approach to grandmaster design. This compact, power-efficient PTP grandmaster featuring an integrated GNSS receiver and NTP server is the ultimate cable network synchronization solution.

1. Synchronization in Cable Networks June 20, 2017 Technical Marketing

2. Legacy CMTS: S ynchronization 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. General Synchronization Requirements IEEE 1588 PTP for cost-efficient synchronization from central grandmaster User Access Network Headend Precision Time Protocol IEEE 1588 - PTP F iber C oax CMTS Grandmaster (GM) Towards D-CCAP DOCSIS Timing Protocol (DTP) Cable Modem (CM) DOCSIS DTP N TP 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. 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 Clock RPD Cable Modem (CM) PTP

5. RPD Precision Timing Services DOCSIS “precision t iming s ervice ” requesting very stringent phase/time and frequency accuracy* Mobile base stations require highly precise synchronization Highly precise timing needs to be sourced as close to the appliance as possible Improving scalability and accuracy of timing by distributing the grandmaster Cable Modem (CM) DOCSIS DTP Distri - buted CCAP BC – Boundary Clock OC - Ordinary Clock Remote PHY O C BC Edge GM (Option 1) BC Edge GM (Option 2) On-site GM (Option 3) Increasing sync accuracy by moving GM closer to the appliance Aggregation OC * “Remote DOCSIS Timing Interface ”-Specification, CM-SP-R-DTI-I04-170111

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 O C OC OSA 5410 Series E dge GM, PR(T)C, SyncE

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 f iber/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

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 N ew T iming Specific expertise needed for precise, reliable and manageable timing delivery