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Passive Optical Network -Protocols- PowerPoint Presentation
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Passive Optical Network -Protocols-

Passive Optical Network -Protocols-

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Passive Optical Network -Protocols-

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  1. אוניברסיטת בן-גוריון בנגב הפקולטה למדעי ההנדסה המחלקה להנדסת חשמל ומחשבים Passive Optical Network -Protocols- Present Rony Levin Email Course Optical Communications Networks Number 361-2-5571 Lecturer Prof. Dan Sadot

  2. Agenda • Historical Overview • Terms Definition • PON Overview • PON Protocols Overview • PON Protocols Comparison • Summary

  3. Good Network Bad Network Communication Problem If “good network” user connect to another user in the same network he can enjoy from high quality service, but if he will try to connect to user belong to “bad network”, the received service will be terrible. Of course, he will accuse “good network” vendor&operator Converter

  4. Communication Problem In order to avoid such kind of problems vendors&operators have been compelled to cooperate, although they were competitors. Communications protocol were developed to supply data streaming, using some kind of common used rules. Today, when optical communication industry is developed, nobody wants to repeat previous mistakes

  5. Who Is Who • FSAN Full Service Access Networks (from 1995) • ITU-T International Telecommunication Union Telecommunication Standardization Sector • IEEE Institute of Electrical and Electronics Engineers • Infonetics Research ( is an international market research and consulting firm specializing in telecom and data networking

  6. How Does It Work

  7. FTTx : Fiber-To-The-x FTTH - Home FTTC - Curb FTTN - Node or Neighborhood FTTP - Premise FTTB - Building or Business FTTU - User FTTZ - Zone FTTO - Office FTTD - Desk

  8. Acronyms OAN Optical Access Network ODN Optical Distribution Network ONU Optical Network Unit OLT Optical Line Termination ONT Optical Network Terminal CO Central Office QoS Quality of Service SLA Service Level Agreement AGCAutomatic Gain Control

  9. Vicious Cycle Don't want to pay more for bandwidth or QoS because there are no applications or services that require them Don't want to upgrade the networks because users are not willing to pay for QoS or higher bandwidth User Don't want to develop new applications or services because there is no network infrastructure available to support them Network Operator Content Provider

  10. Virtuous Cycle Demand more bandwidth and QoS to receive new applications and services New infrastructure is deployed to support new applications User Emergence of and competition among new applications Network Operator Content Provider

  11. Last/First Mile Problem Metro-Area Network Local Area and Home Network Access Network Last/First mile 10 Gb/s ~Tb/s 1 Gb/s~ 40 Gb/s 1 Mb/s~ 1 Gb/s • Cooper wire technology • Dial-up 56Kb/s • DSL/Coax 100Kb/s~5Mb/s Backbone

  12. CO OAN // OLT ONU PON - Last Mile Problem Solution PON – Passive Optical Network Point-to-multipoint, consist of one OLT at the CO, OAN(~20 km), passive optical splitter and optical fibers, that allow to serve one and more ONUs

  13. First Mile Evolution Point-to-point links • N fibers • 2N optical transceivers Concentration switch in the neighborhood • 1 fiber • 2N+2 optical transceivers • Electrical power in the field PON – a distributed switch • 1 fiber • N+1 optical transceivers • No electrical power in field • Downstream broadcast

  14. Fiber vs Cooper • Fiber is less costly to maintain than copper based systems (though they are costly to install…) • PON transmission is conducted through a single strand and thereby conserves fiber • PON conserves optical interfaces at the OLT because a single fiber is used to service as many as 32/64/128 end-user locations • Aggregation and concentration in the OLT

  15. PON Architecture

  16. PON Topologies Treetopology Ring topology Bus topology

  17. PON Standardization ITU-T G.983 APON ATM Passive Optical Network BPONBroadband PON, is a standard based on APON ITU-T G.984 GPON Gigabit PON, is an evolution of the BPON standard IEEE 802.3ah EPON or GEPON Ethernet PON, is an IEEE/EFM standard for using Ethernet for packet data IEEE 802.3av 10GEPON10 Gigabit Ethernet PON, is an IEEE Task Force for 10Gbit/s backwards compatible with 802.3ah EPON

  18. PON Standardization • ATM PON (APON) First PON standard, primarily business • Broadband PON (BPON) Expanded version of APON, supporting WDM, survivability, dynamic upstream, bandwidth allocation, higher upstream rates • Giga PON (GPON) Evolution of BPON to higher rates, choice of L2 support (Ethernet or ATM), enhanced security • Ethernet PON (EPON) IEEE/EFM standard using Ethernet for packet data 1.25Gpbs up/downlink, DBA, OAM, etc.

  19. ATM ATMhas its roots in the telephonebusiness Connection-oriented protocol with excellent QOS When a connection is made, it exists for the entire communication session, ensuring a reliable channel

  20. Ethernet Ethernet has its roots in office data systems Connectionless-oriented, with excellent efficiency Packets are transmitted individually, requiring resources only when they are being transmitted

  21. TDM PON • Each ONU transmits in its own window (time slot) • All ONUs operate on the same wavelength with identical components • Most of the traffic flows downstream, but not peer to peer (user to user) • Two wavelengths are used: 1310 nm (λ1) for upstream transmission and 1550 nm (λ2) for downstream transmission

  22. TDM PON

  23. EPON DOWNSTREAM TRAFFIC • In the downstream direction, Ethernet frames transmitted by the OLT pass through a 1:N passive splitter and reach ONUs • Broadcast by nature • Packets are broadcast by the OLT and extracted by their destination ONU based on the media-access control (MAC) address


  25. EPON UPSTREAM TRAFFIC • In the upstream direction, data frames from ONUs reach only the OLT, and not other ONUs • Each ONU buffers the upstream LAN traffic and sends it to the OLT when its window is open • Upstream B/W is controlled by the window size per ONU


  27. Each ONU has dedicated wavelength WDM PON

  28. TDM-PON vs WDM-PON

  29. PON Market • North American market – GPON • Asia (Japan and Korea) – EPON • Sales of Ethernet FTTH equipment surged 89% in 2007 over 2006 . The number of worldwide PON and Ethernet FTTH subscribers topped 12.6 million in 2007 and is forecast to grow to 80.5 million in 2011

  30. EPON vs GPON Framing

  31. Protocol Comparison

  32. Any Question?

  33. Thank You for Attention