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Optical timing channel (OTC) solution delivers
new levels of network synchronization
End-to-end technology uses PTP-optimized optical
transport channels for ultra-precise timing
© 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
© 2020 ADVA. All rights reserved.33
Migrating towards a future-proof sync architecture
Higher availability Better accuracy
Adding ePRC,
ePRTC at core
ADVA OTC technology delivers accurate timing over DWDM networks
High-performance
sync overlay
Optical timing
channel (OTC),
boundary clocks
class D
© 2020 ADVA. All rights reserved.44
Timing device
OTC regen
ILA
ROADM
Terminal
Cross-connect
Terminal / ADM card
Optical timing channel (OTC)
Our optical timing channel (OTC) solution
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
© 2020 ADVA. All rights reserved.55
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
© 2020 ADVA. All rights reserved.66
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
© 2020 ADVA. All rights reserved.77
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
© 2020 ADVA. All rights reserved.88
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
© 2020 ADVA. All rights reserved.99
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
Supports SyncE and PTP for frequency, phase
and time synchronization
Logical, topological, nodal view of timing
delivery
Manages transport and synchronization
network
Highlights active/backup clock streams,
identifies timing loops
Unique SyncjackTM framework for
synchronization assurance
Synchronization network health indication
GNSS assurance – jamming and spoofing
detection
Ensemble Sync Director
© 2020 ADVA. All rights reserved.1010
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
© 2020 ADVA. All rights reserved.1111
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
• Alarms generated by machine-learning method
• Jamming and spoofing detection
Helps to set GNSS receiver configuration for
optimal results
Secure solution for on-premises data collection,
storage and processing
Benefits
© 2020 ADVA. All rights reserved.1212
OTC builds on ADVA expertise in synchronization, optics and packet networking
Precise synchronization over the ADVA optical timing channel solution
Summary
• Mitigates GNSS shortcomings and
vulnerabilities
• Precisely compensates 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
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

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Optical timing channel (OTC) solution delivers new levels of network synchronization

  • 1. Optical timing channel (OTC) solution delivers new levels of network synchronization End-to-end technology 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
  • 3. © 2020 ADVA. All rights reserved.33 Migrating towards a future-proof sync architecture Higher availability Better accuracy Adding ePRC, ePRTC at core ADVA OTC technology delivers accurate timing over DWDM networks High-performance sync overlay Optical timing channel (OTC), boundary clocks class D
  • 4. © 2020 ADVA. All rights reserved.44 Timing device OTC regen ILA ROADM Terminal Cross-connect Terminal / ADM card Optical timing channel (OTC) Our optical timing channel (OTC) solution 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
  • 5. © 2020 ADVA. All rights reserved.55 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
  • 6. © 2020 ADVA. All rights reserved.66 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
  • 7. © 2020 ADVA. All rights reserved.77 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
  • 8. © 2020 ADVA. All rights reserved.88 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
  • 9. © 2020 ADVA. All rights reserved.99 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 Supports SyncE and PTP for frequency, phase and time synchronization Logical, topological, nodal view of timing delivery Manages transport and synchronization network Highlights active/backup clock streams, identifies timing loops Unique SyncjackTM framework for synchronization assurance Synchronization network health indication GNSS assurance – jamming and spoofing detection Ensemble Sync Director
  • 10. © 2020 ADVA. All rights reserved.1010 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
  • 11. © 2020 ADVA. All rights reserved.1111 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 • Alarms generated by machine-learning method • Jamming and spoofing detection Helps to set GNSS receiver configuration for optimal results Secure solution for on-premises data collection, storage and processing Benefits
  • 12. © 2020 ADVA. All rights reserved.1212 OTC builds on ADVA expertise in synchronization, optics and packet networking Precise synchronization over the ADVA optical timing channel solution Summary • Mitigates GNSS shortcomings and vulnerabilities • Precisely compensates 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 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