Oscilloquartz's new enhanced primary reference time clock (ePRTC) system enables unprecedented timing accuracy and stability even when the GNSS signal is lost. The technology provides the ideal timing source for mission-critical transport systems such as utility networks, government infrastructure and radio access networks and delivers the strict synchronization needed for LTE-A and 5G applications. Featuring the OSA 3230B ePRC atomic cesium clock connected to an Oscilloquartz clock combiner and grandmaster, the new solution offers the extremely stable frequency of a cesium clock with the UTC-traceable signal provided by GNSS. What’s more, when combined with the OSA 5430, the OSA ePRTC system is the only solution available that provides full hardware redundancy and multiple fan-out options including PTP over 10Gbit/s.

1. Introducing the OSA ePRTC solution
June 2018

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Critical infrastructures need precise timing for rapid failure
localization and efficient operation of distributed control processes
Our industry requires better timing
Technical innovation and regulation creates a need for precise synchronization
Replication of data in globally dispersed data centers and synchronization
of distributed processes need tight timing
Precise timing is required for highly efficient radio access network and
accurate positioning in mobile networks as well as cable networks
Transactional services in finance and also security
applications depend on trustworthy and precise time

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Synchronization requirements
in mobile networks
2G/3G: frequency synchronization
LTE – TDD: 1.5µs time synchronization (large cells)
LTE – multicast: several µs time synchronization
LTE advanced CoMP: 1µs time synchronization
5G – positioning: <100ns time sync (cluster)
5G – CA, IoT: several 100ns time sync (cluster)
Fronthaul eCPRI: <100ns time sync

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… but requires a backup
GNSS provides excellent timing accuracy …
“In some sectors, the vulnerabilities of
GNSS to both natural and ground-based
interference, including through malicious
attacks, are poorly understood. In others,
there is insufficient protection against
disruption, reducing our collective
resilience to a loss of these systems.”
Source: Satellite-Derived Time and Position, UK
Government – Office of Science, 2018
Commercially available GNSS jamming devices:

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Central grandmaster
distributing time from
satellite-synchronized
atomic clock
PTP packets delivered over
existing packet-based
network
Accuracy depends on
packet delay characteristics;
realistically very hard to
meet sub-1µs
Moderate phase and time of day synchronization from central timing source
Introducing time synchronization in mobile RAN
SSU
Edge of
mobile core
Atomic
clock
PTP
grandmaster
PRTC
Ethernet with SyncE
IEEE 1588 PTP

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Distributing PRTC to
network edge, ultimately
locating at macro cell site
Improving core PRTC
towards ePRTC
Adding boundary clock /
transparent clock
capability to packet
network
Different measures enhance accuracy of cell site timing
Improving accuracy of time synchronization
SSU
Edge of
mobile core
ePRTC
Distributing PRTC
Boundary clock

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Emerging synchronization architecture for most stringent timing requirements
Meeting most stringent timing requirements
RH
RH
RH
BBU
BBU
BBU
Fronthaul network:
full on-path support
with enhanced BC
and SyncE
Cell sites with eRE
for fronthaul timing
Central BBU pool
with eREC fronthaul
timing and GNSS-
disciplined GM
Core network: full
on-path support
BC and SyncE
Central
synchronization
delivery with
grandmaster and
ePRTC

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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
Cs
Intelligent
combiner
SSU Packet master clock Packet master clock
Sync
network
Sync
network
Sync
network
SSU Packet slave clock Packet slave clock
Cs as backup

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Cesium clock helps filtering fluctuations
caused by the impact of atmospheric
interference, solar storms or ionospheric
variation on clock recovered from GNSS
Enhanced PRTC (ITU-T G.8272.1)
MTIE
τ(s)
15ns
100ns
1ns
0.1 1 10 100 400k1k 10k
10ns
100k 1M 10M 100M
30ns
4ns
30ns
30 ns
100 ns
4ns
GNSS Cs
Intelligent
combiner
30ns MTIE in GNSS-locked mode 100ns MTIE over 14 days in holdover mode (Class-A)

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• ePRTC is significantly improving
holdover performance with low
added cost
• OSA 54XX can work with any Cs
clock improving the performance in
holdover significantly
ePRTC is a quantum leap in holdover capability
Comparing phase stability of PRC with ePRTC
0
2000
4000
6000
8000
10000
12000
14000
14 days holdover
Holdover [ns]
PRC G.811 practical PRC ePRTC
70ns

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Compact OSA ePRTC solution with OSA 5421
GNSS
receiver
Clock
combiner PPS/PPS+ToD
OSA 3230B ePRC cesium
GNSS
GNSS antenna
OSA 5421
10 Mhz
BITS
Sync-E
PTP
NTP

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Redundant OSA ePRTC solution with OSA 5430
GNSS
Receiver
Clock
Combiner PPS/PPS+ToD
OSA 3230B ePRC cesium
GNSS
GNSS antennas
OSA 5430
10 Mhz
BITS
Sync-E
PTP
NTP
Clock
combiner
GNSS
receiver
OSA 3230B ePRC cesium

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• OSA ePRTC solution uses superior OSA 3230B cesium
clock and OSA 54XX scalable grandmasters
• The ePRTC’s enhanced holdover stays within
+/-100nsec from UTC for two weeks, even when
GNSS is lost
• The solution meets highest accuracy and stability
according to latest ITU-T ePRC/ePRTC specifications
• The ePRTC clock combiner is integrated with the
grandmaster for compact design and cost
effectiveness
High timing availability and best accuracy with OSA ePRTC solution
Summary

14. Thank you
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