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Bestpracticesforbuildingultra Lowlatencymicrowavenetworks PDF 121220160705 Phpapp01
Transcript of Bestpracticesforbuildingultra Lowlatencymicrowavenetworks PDF 121220160705 Phpapp01
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BEST PRACTICES FOR BUILDING ULL NETWORKS
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PROGRESSION LOW LATENCY NETWORKS
FIBER DATA NETWORKS (ANALOG/DIGITAL)
ON COPPER
MESSENGER SERVICES, PHYSICAL/HAND DELIVERY
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PRE-1970’S 70’-80’s 90’s-TODAY over $4B
market globally
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NEXT STEP IN LOW LATENCY PROGRESSION: MICROWAVE
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MICROWAVE IS FASTER THAN FIBER AND IS QUICKLY BECOMING DEFACTO STANDARD FOR ULTRA LOW LATENCY TRANSPORT
microwave uses more direct routes (less distance)
propagation is 30% faster over air
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Functional, viable, practical. ???
WHAT IS USABLE LATENCY?
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Weather (rain,
propagation)
Reliability Installation
Sites and Acquisition
Number Hops
Path Design and
Regulatory Issues
Network Management
Co-Existence with Fiber
Security
Latency
BUT MICROWAVE IS COMPLEX AND NEW TO FINANCIAL SERVICES…
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3 ULL MICROWAVE QUESTIONS
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Full size image
AVIAT NETWORKS
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RELEVANT TECHNICAL CONSIDERATIONS
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Equipment Latency Payload Interface Serialization Delay Modem Technology
End-to-End Latency Repeaters RF and Modem Performance
Operational Considerations
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WHERE DOES LATENCY GO? On a standard latency microwave link
0.39%
7.00%
19.26%
30.82%
38.52%
3.85%
0.15%
SHORT FRAMES (64)
Interface Speed
Switching &Serialization
Transfer Buffers
Interleaving
Encoding/Decoding
Mod/Demod
Analog Front End
5.13%
44.07%
10.57%
16.91%
21.13%
2.11% 0.08%
LONG FRAMES (1518)
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PAYLOAD INTERFACES AND SERIALIZATION DELAY
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Ethernet Interfaces L1 Interfaces (STM1/OC3) Proprietary L1 Interfaces (Clock and Data)
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MODEM TECHNOLOGY
Forward Error Correction Modulations and Bandwidths Diversity Protection
Improves link availability and hence low latency availability Adaptive Modulation and Adaptive Coding Latency Increase
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FEC Method
Linear and Iterative
Convolutional Codes
Algorithm
LPDC, Turbo Codes
Viterbi
Latency
High
Medium
Block Codes
No FEC
Reed Solomon
- - -
Low*
Lowest
SG Imp.
High
Good*
None
Good
BW 30 MHz
40 MHz
Mod
16 Q
AM
32 Q
AM
50 MHz
128
QA
M
64 Q
AM
256
QA
M
QPS
K
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LOW LATENCY… (OBVIOUSLY) SO HOW DO WE REDUCE THE LINK LATENCY?
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- High speed interfaces - Use small frame sizes - Early packet forwarding - Reduce buffering wherever possible - Eliminate Interleaving - Reduce or eliminate FEC
And equipment/box latency is easy to understand/measure, but…
~10-20 µs
BOX
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THE REAL METRIC IS END-END LATENCY (THIS IS WHERE IT GETS COMPLICATED…)
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Exchange
And best ways to lower end-end MW latency…
BOX Exchange
BOX BOX
BOX BOX
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REDUCE NUMBER AND COMPLEXITY OF THE HOPS INTRODUCTION OF THE REPEATER CONCEPT
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- Latency in Nx10 ns - RF Repeater
- Limited RF Options - Mask Limitations
- IF Repeater - Frequency Agile - Mask Limitations
- Digital Repeater - Frequency Agile - Usually No Mask Limitations
Regenerator Node
Regenerator Node
Repeater Node
Repeater Node
30% reduction
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Regenerator Node
Repeater Node
Repeater Node
Regenerator Node
Repeater Node
Repeater Node
Regenerator Node
Repeater Node
Repeater Node
Regenerator Node
Repeater Node
Regenerator Node
ADAPTIVE REPEATER TECHNOLOGY
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Ultra Low End-End Latency
Low End-End Latency (still better than fiber)
99% of time
1% of time
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RF AND MODEM PERFORMANCE WHERE DOES IT HELP?
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• Link Distance • Number of Hops • Link Availability
• Techniques include: - Tx Power - Rx Sensitivity - Diversity
• Antenna Size • Number of Repeaters
- FEC Coding - Rx Threshold - Higher Quality Oscillators
Ultimately all revolves around having better System Gain !!!
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QUANTIFY RF / MODEM PERFORMANCE
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Example: Chicago rain zone, 99.999 Availability, 6 Ft Antenna, 64QAM
Frequency Band
6 GHz
11 GHz
Std System Gain
51.6 Miles
35.1 Miles
+3dB
55.8 Miles
38.5 Miles
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AND MANAGING THE RELIABILITY / LATENCY TRADEOFF
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End-End Latency
Path Uptime
Low Latency
High Latency
99.999% 90%
Good News: with new innovations,
best of both worlds can be achieved…
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AVIAT NETWORKS
SO THAT’S LOW LATENCY…
Thus a full featured microwave solution will be required
BUT what good is low latency if your network is:
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BEST PRACTICE FOR BUILDING LOW LATENCY MICROWAVE NETWORKS: FOCUS ON END-END LATENCY USING A FULL-FEATURED
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MICROWAVE PLATFORM
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AVIAT NETWORKS
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ULL MICROWAVE LIFECYCLE
And path planning is more than just GPS Coordinates and Google Maps! AVIAT NETWORKS
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VALIDATE THE ROUTE
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Phase 1 - Planning and Design • Regulatory • Site Selection • Frequency Coordination and Acquisition • Transmission and Network Engineering • Site & Path Survey Is the route viable?
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SECURE THE SITES
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Site Acquisition and Construction • Site Acquisition and Leasing • Engineering and Drafting • Zoning • Utilities and Construction • System Engineering and Optimization
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BUILD AND LAUNCH THE NETWORK
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Integration and Deployment • Configuration and Network Engineering • Factory Integration • Equipment Staging • Installation of Antennas, Lines & Ground
Equipment • Radio Installation and Path Alignment • Acceptance Testing & Commissioning • Commercial Launch
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When the network is built…then what? Focus on what you do best and let Microwave experts keep the network running at optimal speed and efficiency
Peace of Mind! AVIAT NETWORKS
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AVIAT NETWORKS
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Functional, viable, practical. ???
MAXIMIZE PROFITABILITY OF THE NETWORK
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THANK YOU
AVIATNETWORKS.COM