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Synchronization Planning
and Deployment
Considerations for the
Converged Network
Peter Roberts
Nov 4, 2009
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1Layer 1 Synchronization
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Synchronization Management
Synchronization Manager needs to ensure the resilient delivery of
quality synchronization references to all the network elements
Highly Specialized knowledge base
Elements
Stratum 1 Sources, GPS Receivers
BITS/SSUs
Network Elements (SEC/EEC)
Physical Links
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Synchronization Plan overlay of Physical Connectivity
Methods
Paper exercise
Automated assist/control
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Management Focus
Configuration, Fault, Performance Management
Layer 1 Synchronization Distribution
Redundant distribution to each node
Maximum span between SSUs
Loop avoidance
Plan vs Reality
Monitoring of current distribution
Analysis of failure/maintenance scenarios
Re-architecting with the addition of network segments
Correlation of distribution to performance
Efficient and timely analysis
React quickly to problems
Speed commissioning
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Synchronization Management Tools
Vendor B NEs Vendor C NEs
Vendor A Element Manager
Vendor A NEs
Synchronization
Link Management
Vendor B Element Manager
Vendor C Element Manager
Resource
Management
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Topology Analysis
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Distribution Maintenance
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2Convergence and Timing over Packet
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Converged Network
DSL
Packet
Microwave
Multiservice
Optical Transport
PW
E1
Eth
E1/Eth
Multiservice
IP/MPLS
GPON/EPON
Eth
Ethernet
IP/MPLS
Microwave
Multiservice
Optical Transport
Multiservice
IP/MPLS
IMS
NGN
E1
Eth
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Timing over Packet
Packet based techniques
ACR for Circuit Emulation
Carrier class NTP
IEEE 1588-2008
Dynamic Paths
Uses physical links but not fixed
Routing protocols select paths
L2/L3 flows need to be modeled
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Timing over Packet Delivery
In band interactions
Physical link characteristics (GE vs xDSL vs µWave)
Switch/Router forwarding characteristics
Packet prioritization
User traffic dynamics
More variability in synchronization signal quality
Increased monitoring
Packet and frequency domain
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Distribution Planning & Maintenance
PDV
Needs characterization
Rerouting control
Interworking Sites
Layer 1 to Timing over Packet interchange
Traceability (SSM)
Signal Quality
Migration from SDH to IP/MPLS may change these sites
Additions of On Path Support nodes
NTP servers
Boundary clocks
Transparent clocks
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In service Monitoring
Performance monitoring
ToP status (red/yellow/green)
Stability metrics
Event collection +
-Filter
DCO
Oscillator
Recovered
Frequency
ToP Packet Stream
Phase Error
Filter Output
(DCO Offset)
•Approaches 0 when stabilized
•Approaches constant value when stabilized
Phase Detector
Phase Detector
f0 = Osc center freq
f1' Df
(f1)
DCO: f1' = f0 + Df
Performance correlation
Timing events vs network events
Path load monitoring
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Synchronization Management Tools
Vendor B NEs Vendor C NEs
Vendor A Element Manager
Vendor A NEs
Synchronization
Path Management
Vendor B Element Manager
Vendor C Element Manager
Resource
Management
Synchronization
Service
Management
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Conclusions
Synchronization Service planning and monitoring are essential
Addition of Timing over Packet synchronization delivery techniques
increases the challenges
Automated tools for planning, characterizing, and monitoring the
synchronization paths can provide significant assistance
Efficient correlation between path routing, traffic loading, and ToP
performance
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