Meet the industry’s first ePRC optical cesium atomic clock solution. Our OSA 3350+ provides unprecedented stability and significantly longer lifetime compared to all other ePRC cesium clocks. It’s also the first cesium clock on the market with built-in SNMP support. Synchronization networks can now be protected from long GNSS outages caused by jamming and spoofing attacks, protecting mission-critical infrastructure and enabling mobile networks to transition to 5G.

1. Introducing the OSA 3350 ePRC+ and a
new era of optical cesium innovation
June 2020
Unprecedented stability and significantly longer lifetime

2. © 2020 ADVA Company. All rights reserved.22
Governmental response SolutionProblem
Highly stable atomic clocks are key to national interest
Atomic clocks for resilient critical infrastructures
Jamming and spoofing are a
major risk to business
continuity in power networks
e.g., Galileo e.g., GPS
Dual constellations
Packet
network
GPS
Atomic clock
Redundancy and terrestrial sync
delivery from atomic clocks providing
highly stable timing signals
Executive order on strengthening
national resilience through responsible
use of positioning, navigation, and
timing services - February 2020
PRTC
ePRTC

3. © 2020 ADVA Company. All rights reserved.33
Mobile synchronization requirements
2G/3G – frequency synchronization
3G TDD: 5µs time synchronization (large cells)
LTE – multicast: several µs time synchronization
LTE Advanced CoMP, TDD: 1.5µs time synchronization
5G – positioning: <100ns time sync (cluster)
5G – CA, IoT: several 100ns time sync (cluster)
Fronthaul eCPRI: <100ns time sync
Accuracy needs to
further improve

4. © 2020 ADVA Company. All rights reserved.44
Telecommunication network reference
• Telecom operators, accurate phase sync for 5G
(ePRTC)
Critical infrastructure
• Power utilities, railways, transport, airports
Enterprise / data centers (ICPs) / finance
• Synchronization of distributed databases
• High-frequency trading
Defense
• Precise timing for security applications
• Highly accurate localization
OSA 3350 as GNSS backup as well as higher stability and better holdover
Markets

5. © 2020 ADVA Company. All rights reserved.55
Optical cesium achieves
superior performance
Midterm advantages for optical cesium due to
synergies with photonic assembly technologies
Both cesium clock technologies apply proven,
highly-reliable components
Optical cesium improves the utilization of Cs
atoms, leading to longer lifetime
Optical and magnetic cesium
Lifetime Performance
Reliability Production

6. © 2020 ADVA Company. All rights reserved.66
F=3,4 RFLaser Laser
N
S
N
S
F=3,4 RF
Weak flux
• Strong velocity selection (bent)
• Magnetic deflection (atoms kicked off)
Typical performance:
• 3E-11 t-1/2
• 8 years
Stringent alignment (bent beam)
High flux (x100)
• No velocity selection (straight)
• Optical pumping (atoms reused)
Typical performance:
• 3E-12 t-1/2
• 10 years
Relaxed alignment (straight beam)
Magnetic deflection technology for ePRC Optical pumping technology for ePRC+
Cesium atomic clock: Let's look inside …

7. © 2020 ADVA Company. All rights reserved.77
• Outperforms ITU-T G.811.1 ePRC specification
• 10 years of operation – no compromise between
lifetime and performance
• Combined with OSA core grandmaster: ePRTC+
for outstanding holdover +/- 35nsec in 14 days
• Wide range of interfaces (BITS, 1PPS, analog …)
• Fully supported by ADVA Ensemble Controller
management system
• Remote and secured management using SNMPv3
for ease of integration into third-party NMS
• Fully redundant and hot-swappable PSUs
All you need: power supply and optional NMS
OSA 3350 ePRTC+: your ideal backup to GNSS
SNMPv3
(secured)
Ensemble Controller
with Ensemble Sync
Director
Ease of integration
into third-party NMS
OSA 3350
3HU in 19” racks

8. © 2020 ADVA Company. All rights reserved.88
Cesium clock as time source
PRC (G.811)
Frequency
PRC : Cs or GNSS
NE NE NE
PRTC (G.8272)
Frequency + phase
PRTC : GNSS
NE NE NE
ePRTC (G.8272.1)
Frequency + phase
GNSS
NE NE NE
CsCombiner
SSU Packet master clock Packet master clock
Sync
network
Sync
network
Sync
network
SSU Packet slave clock Packet slave clock
Cs as backup

9. © 2020 ADVA Company. All rights reserved.99
Typical implementation
ePRTC (G.8272.1)
Class A
GNSS Cs clockCombiner
Function of ePRTC
ePRC-A G.811.1
OSA 5430 / OSA 5440 OSA 3350 ePRC+
PTP packet master clock
• ePRTC combiner

10. © 2020 ADVA Company. All rights reserved.1010
Implementation with two redundant optical cesium clocks
GNSS
Receiver
Clock
Combiner PPS/PPS+ToD
OSA 3350 ePRC+ cesium
GNSS
GNSS antennas
10 Mhz
BITS
Sync-E
PTP
NTP
Clock
combiner
GNSS
receiver
OSA 3350 ePRC+ cesium
OSA 5440
Multi-band
GNSS option

11. © 2020 ADVA Company. All rights reserved.1111
A major innovation in atomic cesium technology
Key takeaways
- New generation of optical cesium
clocks for better stability and longer
lifetime
- Essential solution for backup to
GPS/GNSS with mobile networks,
power utilities and defense, among
many others
- Combines with OSA 5430/40 in
ePRTC application for extended
holdover featuring common
management

12. Thank you
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