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Jeff Stribling
      Hitachi
      4/20/12
Services Landscape
                                                            Examples
  User Type   Data             Voice              Video
                                                          HSD
SMB                                                       Cell Backhaul
                                                          Cloud 
SFU
                                                            Computing
MDU/MTU                                                   E‐Line/E‐LAN
                                                          VoIP
Everyone wants everything!                                IPTV

Simple to say, but a complex problem to solve.

4/20/2012            IEEE 1904.1 SIEPON Seminar, Prague                2
EPON Architecture
            Central                                              Customer 
                                           PON
            Office                                                Premise

                       Optical Splitters

                                                               EPON
                                                               ONU
            EPON
             OLT
                                                                EPON
                                                                ONU
                                                  EPON
                                                  ONU




    EPON can cost effectively provide access for any and all 
    users within fiber reach. 
    What about providing varied services?
4/20/2012                 IEEE 1904.1 SIEPON Seminar, Prague                 3
The Problem of QoS

 Different services and different use cases have different 
 requirements for traffic treatment.


                                    Data
            Latency
            / Jitter




                       Voice                 Video


                                  Bandwidth

  To simultaneously support all these services, QoS must 
  be both comprehensive and flexible.

4/20/2012              IEEE 1904.1 SIEPON Seminar, Prague     4
SIEPON’s QoS Mandate
 Address 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      Throughput
                 parameters
    EIR/EBS
    Frame Delay (FD)
    Frame Delay Variation (FDV)
    Frame Loss Ratio (FLR)
4/20/2012                     IEEE 1904.1 SIEPON Seminar, Prague   5
EPON Service Paths (ESPs)


                                                                             ESPs can be:
                                                                              Upstream
                                                                             Downstream
                                                                               @ ONU
                                                                               @ OLT
                                                                              One LLID
                                                                             Many LLIDs

                                                                           ULTIMATE FLEXIBILITY!
            Reference: Figure 6‐1, IEEE P1904.1, draft D2.3



4/20/2012                             IEEE 1904.1 SIEPON Seminar, Prague                           6
Distributed vs. Centralized Intelligence




              Distributed                                        Centralized
Suited for:                                       Suited for:
MDUs with multiple customers on a                 SFU or SMB with single customers with 
single ONU                                        multiple services on a single ONU
Reducing overhead and resources at                MTUs with business services needing 
OLT                                               strict QoS control
4/20/2012                   IEEE 1904.1 SIEPON Seminar, Prague                           7
Queue Service Discipline (QSD)

                              (a) Threshold‐first
                                  Prevents starvation, improves quality of 
                                  “Best Effort Traffic”
                                  Typically used in high bandwidth systems 
                                  with small numbers of users

                              (b) Priority‐first
                                  Improves quality of higher priority traffic, 
                                  but cannot prevent starvation
                                  Typically used in bandwidth‐limited 
                                  systems with large numbers of users

                              (c) Strict Priority
                                  Improves quality of the highest priority 
                                  traffic
                                  Used only when this highest priority 
                                  traffic must be ensured at all costs

4/20/2012   IEEE 1904.1 SIEPON Seminar, Prague                             8
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             IEEE 1904.1 SIEPON Seminar, Prague             9

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QoS in SIEPON Standard

  • 1. Jeff Stribling Hitachi 4/20/12
  • 2. Services Landscape Examples User Type Data Voice Video HSD SMB Cell Backhaul Cloud  SFU Computing MDU/MTU E‐Line/E‐LAN VoIP Everyone wants everything! IPTV Simple to say, but a complex problem to solve. 4/20/2012 IEEE 1904.1 SIEPON Seminar, Prague 2
  • 3. EPON Architecture Central  Customer  PON Office Premise Optical Splitters EPON ONU EPON OLT EPON ONU EPON ONU EPON can cost effectively provide access for any and all  users within fiber reach.  What about providing varied services? 4/20/2012 IEEE 1904.1 SIEPON Seminar, Prague 3
  • 4. The Problem of QoS Different services and different use cases have different  requirements for traffic treatment. Data Latency / Jitter Voice Video Bandwidth To simultaneously support all these services, QoS must  be both comprehensive and flexible. 4/20/2012 IEEE 1904.1 SIEPON Seminar, Prague 4
  • 5. SIEPON’s QoS Mandate Address 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      Throughput parameters EIR/EBS Frame Delay (FD) Frame Delay Variation (FDV) Frame Loss Ratio (FLR) 4/20/2012 IEEE 1904.1 SIEPON Seminar, Prague 5
  • 6. EPON Service Paths (ESPs) ESPs can be: Upstream Downstream @ ONU @ OLT One LLID Many LLIDs ULTIMATE FLEXIBILITY! Reference: Figure 6‐1, IEEE P1904.1, draft D2.3 4/20/2012 IEEE 1904.1 SIEPON Seminar, Prague 6
  • 7. Distributed vs. Centralized Intelligence Distributed Centralized Suited for: Suited for: MDUs with multiple customers on a  SFU or SMB with single customers with  single ONU multiple services on a single ONU Reducing overhead and resources at  MTUs with business services needing  OLT strict QoS control 4/20/2012 IEEE 1904.1 SIEPON Seminar, Prague 7
  • 8. Queue Service Discipline (QSD) (a) Threshold‐first Prevents starvation, improves quality of  “Best Effort Traffic” Typically used in high bandwidth systems  with small numbers of users (b) Priority‐first Improves quality of higher priority traffic,  but cannot prevent starvation Typically used in bandwidth‐limited  systems with large numbers of users (c) Strict Priority Improves quality of the highest priority  traffic Used only when this highest priority  traffic must be ensured at all costs 4/20/2012 IEEE 1904.1 SIEPON Seminar, Prague 8
  • 9. 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 IEEE 1904.1 SIEPON Seminar, Prague 9