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Minimizing Collision Probability in EPON: Project Overview and Future Plans

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This presentation outlines the efforts to minimize collision probability in Ethernet Passive Optical Networks (EPON). It covers the background of the 802.3ah standard, project objectives, and advancements in discovery cycle policy design. The project includes creating a simulation using OPNET to test TDMA schemes and oversee communication between Optical Network Units (ONUs) and Optical Line Terminals (OLTs). Key features include advanced MAC message formats, bandwidth allocation, and performance monitoring to enhance user experience. The collaborative effort aims for further development in WDM-EPON scenarios.

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Minimizing Collision Probability in EPON: Project Overview and Future Plans

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Presentation Transcript

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  1. Minimize Discovery Collision Probability in EPON Group meeting 12.29 Advisor: Guowei Liu zhe

  2. Overview • Background - 802.3ah & EPON • Project Description • Project status and advancement plan

  3. Project Background

  4. Downstream Model Data in true Ethernet frames

  5. Upstream Model • TDMA • No collisions • No fragmentation

  6. Dicovery process in ONU & OLT • Gate,Regsiter_req,Register,Register_ack,

  7. Round-trip time measurement in Auto discovery • RTT = t2 – t1

  8. Discovery slot and discovery window RTT max = 2 * 20km/2e8 = 200us

  9. Frame overhead • IFG(inter frame guarding) 8Bytes • AGC(auto gain control) 400ns • CDR(clock data recovery)400ns • Ethernet Frame overhead 8+6+6+4+2=26Bytes • Laser on 512ns • Laser off 512ns total overhead = 2096ns = 2.096us

  10. The Project

  11. Project Goal • Design and analyze discovery cycle policy • Create an EPON simulation in OPNET • For future: WDM-EPON DBA & double OLT WDM-EPON simulation Design and test discovery cycle policy for minimizing collision probability and enhance user experience

  12. Test Scenario

  13. OPNET Prototype Goal: Construct a basic OPNET model of EPON Main Features: • Add 802.3ah packet formats (new MAC messages) • TDMA bandwidth allocation scheme • ONU • Filter GATE messages and act upon them • Generate REPORT messages based on queue status • OLT • Collect reports from all ONUs • Ability to generate GATE messages • Basic statistics gathering

  14. ONU Data Path Register_req Register_ack Report To PON Grant & Register From PON 1 Gbps ONU Traffic ONU Data

  15. Packet_filter_process • The red state: unforced state, the system can stay here • The green state: forced state. Do and leave now

  16. ONU_scheduler_process Generate Status Regis_req Future control msgs Generate Status Report Generate Status Regis_ack

  17. OLT Data Path To PON Gate Register Register_req Register_ack Report From PON 1 Gbps Upstream Data

  18. Packet Format Register Register_ACK

  19. The Presentation Ends The Work Continues…

  20. Thank You! Happy New Year

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