QoS in SIEPON Standard
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Transcript of QoS in SIEPON Standard
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Jeff StriblingHitachi4/20/12
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Services Landscape
User Type Data Voice Video
SMB
SFU
MDU/MTU
Examples
HSDCell BackhaulCloud Computing
E‐Line/E‐LANVoIPIPTVEveryone wants everything!
Simple to say, but a complex problem to solve.
4/20/2012 2IEEE 1904.1 SIEPON Seminar, Prague
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EPON Architecture
Optical Splitters
EPONOLT
EPON ONU
EPON ONU
EPON ONU
Central Office
Customer PremisePON
EPON can cost effectively provide access for any and all users within fiber reach. What about providing varied services?
4/20/2012 3IEEE 1904.1 SIEPON Seminar, Prague
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The Problem of QoS
Different services and different use cases have different requirements for traffic treatment.
To simultaneously support all these services, QoS must be both comprehensive and flexible.
Bandwidth
Latenc
y/ J
itter
Voice Video
Data
4/20/2012 4IEEE 1904.1 SIEPON Seminar, Prague
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SIEPON’s QoS MandateAddress the previously stated problem: create a comprehensive and flexible QoS architecture using EPON transport that simultaneously enables vendor interoperability.This starts with defining service parameters we can use as metrics to ensure the service requirements (and operator SLAs) are met:
CIR/CBS
PIR/PBS
EIR/EBS
Frame Delay (FD)
Frame Delay Variation (FDV)
Frame Loss Ratio (FLR)4/20/2012 5IEEE 1904.1 SIEPON Seminar, Prague
Throughputparameters
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EPON Service Paths (ESPs)
Reference: Figure 6‐1, IEEE P1904.1, draft D2.3
ESPs can be:Upstream
Downstream@ ONU@ OLT
One LLIDMany LLIDs
ULTIMATE FLEXIBILITY!
4/20/2012 6IEEE 1904.1 SIEPON Seminar, Prague
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Distributed vs. Centralized Intelligence
CentralizedSuited for:SFU or SMB with single customers with multiple services on a single ONUMTUs with business services needing strict QoS control
DistributedSuited for:MDUs with multiple customers on a single ONUReducing overhead and resources at OLT
4/20/2012 7IEEE 1904.1 SIEPON Seminar, Prague
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Queue Service Discipline (QSD)
(a) Threshold‐firstPrevents starvation, improves quality of “Best Effort Traffic”Typically used in high bandwidth systems with small numbers of users
(b)Priority‐firstImproves quality of higher priority traffic, but cannot prevent starvationTypically used in bandwidth‐limited systems with large numbers of users
(c) Strict PriorityImproves quality of the highest priority trafficUsed only when this highest priority traffic must be ensured at all costs
4/20/2012 8IEEE 1904.1 SIEPON Seminar, Prague
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Final Thoughts
Everyone wants everything!
QoS architecture must be flexible
SIEPON introduces ESPs and defines service parameters to control QoS portions of ESPs
Flexibility of ESP allows for proper treatment of service for different user types
Flexibility of QSD allows for proper treatment of service for different service types
Everyone gets everything!
4/20/2012 9IEEE 1904.1 SIEPON Seminar, Prague