ADVA's TrueTime™ technology offers a powerful defense against the risk of GNSS vulnerabilities. Using PTP-optimized optical transport to provide accurate synchronization from the core of the network to the edge, it will prove key for 5G, smart grid and other time-sensitive applications.

1. Delivering new levels of network
synchronization with TrueTimeTM
End-to-end solution uses PTP-optimized optical
transport channels for ultra-precise timing

2. © 2020 ADVA. All rights reserved.22
Availability of GNSS might be compromisedGNSS is applied in many networks
Accurate timing is essential for critical infrastructure
Challenges with satellite-delivered timing
Mobile radio
networks
Financial trading
Digital cable
networks
Power utilities
Data center
infrastructure
Broadcast networks
GNSS for
timing
Jamming and
spoofing
Obstruction
Interference with
TV, cellular,
radar, µwave
Ionospheric
disturbances,
solar activity
GNSS antenna not
installed properly

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Migrating towards a future-proof sync architecture
Higher availability Better accuracy
Adding ePRC,
ePRTC at core
TrueTimeTM delivers accurate timing over DWDM networks
High-performance
sync overlay

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Timing device
OTC regen
ILA
ROADM
Terminal
Cross-connect
Terminal / ADM card
Optical timing channel
The optical timing channel (OTC) achieves
high-accuracy time distribution by
PTP (IEEE 1588) via Gigabit Ethernet
over dedicated wavelengths on a single fiber
OTC has minimal constant link asymmetry
due to bidirectional transmission on a single
fiber; further compensation is supported
OTC is independent from other layers
(IP, Ethernet, OTN, reconfigurable optical layer)
practically eliminating dynamic time errors
OTC does not change optical network
engineering rules and is just an overbuild to
the optical transport layer

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OpticallinesystemIntermediatesite
Node with timing access
Terminal west Terminal east
PTP and SyncE over optical timing channel
Payload traffic
High-accuracy timing
device featuring
PTP boundary clock
type D
BiDi transceivers
OTC provides ample optical budget:
Up to 30dB between two BiDi transceivers
Dispersion is irrelevant at GbE line rate
Line terminal

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Bidirectional transceivers
Standard transceivers
Two CWDM slots per bidirectional channel
Standard transceivers have two fiber
connectors (Tx and Rx)
CWDM
slot
Tx
CWDM
slot
Rx
One CWDM slot per bidirectional channel
Bidirectrional transceivers have one fiber
connector with Tx and Rx pre-multiplexed in
the transceiver
Bidirectional transceivers
CWDM
slot
Tx Rx
OTC
Running on the same fiber, forward and backward paths
have exactly the same length; there is only marginal asymmetric delay

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Impact of chromatic dispersion can be efficiently compensated
Same east-west wavelength Alternating east-west wavelength
Asymmetric delay results in a deterministic time error
Chromatic dispersion creates asymmetric delay
100km of fiber with
dispersion of 18ps/(nm*km)
l1 = 1.605µm
l2 = 1.615µm
𝑐𝑇𝐸 ≈
100𝑘𝑚
2
10𝑛𝑚
18𝑝𝑠
𝑛𝑚 ∗ 𝑘𝑚
= 9000𝑝𝑠 = 9𝑛𝑠
85km 65km70km 82km
Time error from chromatic dispersion: 27.2ns
85km 65km70km 82km
Time error from chromatic dispersion: 2ns

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PTP GM/BC type D
and slave
NTP
server
SSU/CCePRTC/PRTC-A/B Sync probe
G.8265.1 EnterpriseG.8275.2 G.8275.1
2G/3G/
4G/5G
FDD BS
DOCSIS 3.1 MiFID II
5G-NR/LTE
TDD/LTE-A BS
NTP61850-9-3/
C37.238
Smart grid
OSA 54XX – Synchronization “Swiss Army knife“
OSA 542X OSA 5430
OSA 5440

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Ensemble management suite is designed to cover the complete ADVA/OSA portfolio
Ensemble management with Ensemble Sync Director
FCAPS management, abstraction and network control
Open NBI
Ensemble
Controller
Ensemble
Packet
Director
Ensemble
Optical
Director
Ensemble management client
Optical
transport
Packet
network
Fiber
assurance / ALM
Ensemble
Fiber
Director
Ensemble
Sync
Director
Sync
Supporting SyncE and PTP for frequency,
phase and time synchronization
Logical, topological, nodal view of timing
delivery
Managing transport and synchronization
network
Highlighting active/backup clock streams,
identifying timing loops
Unique SyncjackTM framework for
synchronization assurance
Synchronization network health indication
GNSS assurance – jamming and spoofing
detection
Ensemble Sync Director

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Logical sync map Topological sync map Node internal sync map
Logical, topological and nodal views simplify operations and minimize configuration faults
Fully transparent synchronization delivery
Frequency
Time

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GNSS assurance
Enables customer to identify sites with GNSS
troubles or potential issues based on:
• Actual geographical position (e.g., physical obstacles)
• Comparison to neighboring sites
• Changes in number of used vs. visible satellites
• Detection of “dead spots” of satellites reception
• Correlation with PMs, alarms/TCA and other events
from the network
• Machine learning method generated alarms
• Jamming and spoofing detection
Helps to set GNSS receiver configuration for
optimal results
Secure solution for on-premises data collection,
storage and processing
Benefits

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TrueTimeTM builds on ADVA expertise in synchronization, optics and packet networking
Accurate timing over optical channels
Summary
• Mitigating GNSS shortcomings and
vulnerabilities
• Precisely compensating asymmetric delay
caused by dispersion in optical transport
• Accurate timing delivery with high-accuracy
class D boundary clocks
• Highest availability with fully redundant
synchronization devices and independent
timing sources

13. Thank you
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