Download - self healing optical access network
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HSN seminar 1
Self-Healing Optical Access Networks
Presented by Jithin P
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HSN seminar 2
Agenda
• Optical Access Network• Issue• Existing Solution• Proposed Solution• Advantages of proposed solution over
existing solution• Compatibility with existing architecture
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HSN seminar 3
Optical Access Network
Point to PointActive Optical NetworkPassive Optical Network
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HSN seminar 4
Optical Access Network
• Connects subscribers to their service providers
OLT
ONU
ONU
ONU
Back bone
OLT : Optical Line TerminalONU : Optical Network Unit
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HSN seminar 5
Issues
•ONU Failure•Link Failure•OLT Failure
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HSN seminar 6
Existing Solution• Dual-home Architecture
OLT#1
OLT#2
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HSN seminar 7
Issues of Dual-home Architecture
• Cost• Fault monitoring methods • Disruption Duration
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HSN seminar 8
Requirements for low cost reliable service
• Survivability must be robust• Failure can be monitored in service• Service can be recovered with minimum
disruption duration• CapEx and OpEx should be minimized
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HSN seminar 9
So What We Need ?
• An access network that can detect and recover from failure itself, with in a matter of second, with low operational & implementation cost.
• And it must be compatible with existing infrastructure.
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HSN seminar 10
SHOAN :- Basic Architecture OLT#1
ONU#11
ONU#12
ONU#13
ONU#14
ONU#22
ONU#23
ONU#21 ONU#24
OLT#2
OLT#1
OLT#2
ONU#11
ONU#12
ONU#13
ONU#14ONU#22
ONU#23
ONU#24
ONU#21
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HSN seminar 11
How to make it possible ?Using cross bar switch
OLT#2
ONU#11
ONU#12 ONU#13
ONU#14
ONU#22
ONU#23
ONU#24
ONU#21
OLT#1
OLT#1
OLT#1
Crossbar#1
Crossbar#2
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HSN seminar 12
For tree network
ON
U#22
OLT#2
ON
U#21
ON
U#12
OLT#1
ON
U#11
OLT#1
How to make it possible ?
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HSN seminar 13
Advantages over Dual-Home
• Cost Issue: • Cost(OLT)>>>Cost(Crossbar switch)
• Fault Monitoring• Faults can be self-discovered and self-managed by only
monitoring bar connections of cross bar switches
OLT#2
ONU#11
ONU#12 ONU#13
ONU#14
ONU#22
ONU#23
ONU#24
ONU#21
OLT#1
OLT#1
OLT#1
Crossbar#1
Crossbar#2
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Failure Monitoring
Failure Monitoring
Failure Occur
Failure Occur
Fault Localization
Triggering network protection
Failure Repair
Service resumed
Finished protection function
Network recovery
Service self-recovery
Failure Repair
Network recovery
Fault Localization
NO
YES
NO
YES
Existing SolutionSelf-Healing System
Disruption Duration Service can be self recovered by just turning the affected cross bar from bar state to cross state, without the process of fault localization and identification.
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HSN seminar 16
Compatibility With Existing Architecture (PON)
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HSN seminar 17
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HSN seminar 18
Message flow in SHOAN
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HSN seminar 19
Conclusion
• SHOAN is– Robust because risks are disjointed– Reliable because disruption duration is minimized– Low cost solution because back up components
are not necessary any more.• Further research
• Crossbar failure• What will happen if both OLT fails?• How CFO and CEO communicate ?• Degradation of service
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HSN seminar 20
Questions ?