Ulrich Kohn’s InfoGuard Innovation Day presentation addressed the key synchronization challenges for mobile radio networks, data center infrastructure, power utilities and more.

1. Solving synchronization challenges with critical
infrastructures
Ulrich Kohn, CISSP – solutions marketing
January 2021

2. © 2021 ADVA. All rights reserved.
2
Timing is essential for business continuity
Critical infrastructures require precise timing
Mobile radio
networks
Financial trading
Digital cable
networks
Power utilities
Data center
infrastructure
Broadcast networks
As timing accuracy increases, many operations apply satellite-delivered time
A simple way to deliver synch at the edge
Global navigation
satellite systems (GNSS):
GPS, Galileo, GLONASS,
BeiDou

3. © 2021 ADVA. All rights reserved.
3
Challenges with satellite-delivered timing
• GNSS outages or temporarily
degraded signal quality
• Ionospheric disturbances
• solar activity
• Jamming: overpowering
weak GNSS signal
• Spoofing: fake GNSS signal
• Obstructions from new
buildings, growing trees
• Antenna construction
frequently does not achieve
clear sky view
• Interference from high-
power RF transmitters such
as TV, cellular, radar, µWave
Is GNSS your only source for synchronization? You should be scared!

4. © 2021 ADVA. All rights reserved.
4
The solution: combining robust GNSS receivers and network-delivered timing
Resilient timing is a matter of national interest
Governmental response
US executive order on strengthening
national resilience through responsible
use of positioning, navigation, and
timing services. February 12, 2020
Germany BSI Gesetz $8a: Betreiber
Kritischer Infrastrukturen sind
verpflichtet....technische Vorkehrungen
zur Vermeidung von Störungen der
Verfügbarkeit...
...many governments request critical
infrastructures to secure business
continuity by securing their IT
Solution
Galileo GPS
Robust satellite-
delivered timing
Packet
network
Atomic clock
network-delivered
timing

5. © 2021 ADVA. All rights reserved.
5
Dual-constellation Dual-band
Hardware-supported attack detection
AI/ML-assisted monitoring
e.g., Galileo e.g., GPS
Improving resilience by using
multiple GNSS technologies
Ionospheric disturbance
is compensated for
better accuracy
Frequency 1
Analyzing GNSS data to
predict issues and
counteract proactively
Monitoring GNSS signals from
different sources to identify
attacks at receiver
Frequency 2
Making satellite-timing robust and accurate

6. © 2021 ADVA. All rights reserved.
6
• Communication in L1 and L2 band
• Dual measurements make it possible to compensate for ionospheric disturbances
• Multi-band GNSS receivers achieve time accuracy of better than 10ns
Multi-band GNSS receiver
Nanosecond time accuracy with multi-band GNSS receivers
Improving accuracy of GNSS receivers
Lower
L-band
Upper
L-band
Delay
difference
Ionospheric
disturbance
0
10
20
30
40
50
ns
Ionospheric daily delay variation
0:00 3:00 6:00 9:00 12:00 15:00 18:00 21:00 0:00

7. © 2021 ADVA. All rights reserved.
7
Migrating towards a future-proof sync architecture
Higher availability Better accuracy
Adding ePRC,
ePRTC at core
Optical timing channel: delivering PRTC-grade timing over DWDM networks
High-performance
sync overlay

8. © 2021 ADVA. All rights reserved.
8
Optical
line
system
Intermediate
site
DWDM 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
class D (TEmax: 5ns)
Bidirectional
transceivers
Line terminal

9. © 2021 ADVA. All rights reserved.
9
Availability: Combining
satellite- with network-
delivered timing
Synchronization interfaces:
Legacy ToD, PPS and IRIG-B
as well as latest PTP featuring
power profile
Best practices: Applying
multi-technology devices for
seamless migration and
resilient operation
Combining GNSS with network timing for accuracy and resiliency
Resilient and accurate sub-station timing
Hybrid
sub-station
PTP power profile
IRIG-B, ToD, 1PPS
Core
clock
Access
clock
Synchronization
Global navigation and
satellite system (GNSS)
Packet-optical
transport

10. © 2021 ADVA. All rights reserved.
10
OSA 542x for multi-technology synchronization
OSA 5420 with IRIG and BITS card
IRIG interface card
SSU, BITS, PPS IRIG NTP server
PTP GM, BC, TC
GNSS receiver
Sync probe, sync
assurance

11. © 2021 ADVA. All rights reserved.
11
A major innovation in atomic cesium technology
OSA3350 ePRC+ is your perfect clock to backup GNSS
New optical cesium clocks for better
stability and longer lifetime
Applicable as ultra-precise frequency
and time clocks
Backup GPS/GNSS in mobile networks,
power utilities, defense among other
critical infrastructures
OSA 3350 ePRC+

12. © 2021 ADVA. All rights reserved.
12
Ensemble Sync Director - GNSS assurance
GNSS monitoring and fault analysis
Health status of all
GNSS receivers
Identifying blind
sport
Smart analysis over
time
Transparent GUI
Optimize
antenna
positioning
and receiver
setting
Performance
monitoring
Root cause
analysis

13. © 2021 ADVA. All rights reserved.
13
Act now!
Key takeaways
GPS and GNSS vulnerabilities
threaten critical infrastructures
Make GNSS receivers robust
Backup/transit to network-
delivered timing
ADVA and Oscilloquartz
provide superior solutions

14. Thank you
IMPORTANT NOTICE
The content of this presentation is strictly confidential. ADVA 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 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.
info@adva.com