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, 2017

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• 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

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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

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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

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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

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• 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

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• 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

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