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OTN Overview & Update

OTN Overview & Update. Jean-Marie Vilain Product Specialist. Agenda. SONET-SDH structure. Sonet / SDH technologies have been out for a while now, the main goal was to transport digital information over fiber, but also support electrical lower rate communication signal. overhead. payload.

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OTN Overview & Update

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  1. OTN Overview & Update Jean-Marie Vilain Product Specialist

  2. Agenda

  3. SONET-SDH structure Sonet / SDH technologies have been out for a while now, the main goal was to transport digital information over fiber, but also support electrical lower rate communication signal overhead payload payload overhead

  4. SONET-SDH structure SONET / SDH supported transport rate

  5. SONET-SDH structure VCAT/LCAS VCAT/LCAS and GFP offered Automatic Flexible bandwidth and Clear way to map Ethernet traffic In to Sonet

  6. Virtual Concatenation Bandwidth Efficiency 100% EfficiencyIncrease 67%

  7. GFP VCAT/LCAS Ethernet map into SDH/SONET Using GFP

  8. WDM Transmission Services Layer Delivery of services to end customers. SDH/SONET Layer High-speed protection/restoration. Time division multiplexing ADM ADM ADM ADM DXC ADM ADM ADM ADM ADM ADM WDM fiber Optical layer Wavelength division multiplexing High level protection WDM WDM WDM fiber WDM WDM WDM line system for fiber saving WDM line system

  9. Why OTN ITU G.709 is the OTN Standard

  10. Why OTN

  11. OTN mapping structure

  12. OTN Frame Format

  13. OTN Overhead structure The FAS/MFAS provides frame alignment. The Section Monitoring provides Error detection and communication The OPU overhead adapt the client signal to the optical channel, specifying the type of client signal in the payload The ODU overhead brings TCM support, Communication channels and Automatic protection switching

  14. Why the use of OTN over SONET/SDH OTN provide better TCM support Over-multiple Carriers. SDH/SONET only support one TCM vs. 6 TCM for OTN

  15. Forward Error Correction (FEC) • FEC provides the following benefits. • Improves the BER performance of an existing link • Increases the maximum span of a link can extend up to 20km and remove the need of regenerator • Improves the overall quality of the link by diagnosing link problems earlier

  16. ITU G.709 Sup 43 Over-Clocked OTN rates OTU1e – OTU2e • The goal here, is to combine multiple 10GE ports from the Core router directly into OTN. • Not to be confused with OTU1 which is a 2.7 Gbit/s signal, these are 10G rates • Not a big issue with 10GE Wan (9.953 Gb/s) where the signal can be directly map into an OPU2 container • This is more a problem with the 10GBASE-R 10GE LAN, where there’s a size mismatch between the containers.

  17. Ethernet in Carrier Networks EoOTN 10/100M Ethernet link OTU2 Access Routers ODU MUX Access Routers OTU1 GigE link OTU2 , OTU3 or even OTU4 MSPP OTU1 ODU1 mux in ODU2 MSPP OTU2 1GigE in ODU0 in OTU1 Access Network Access Routers OTU1 with ODU0 ENIU

  18. Client Interface cards • Powerful • Unframed/ frame testing • SONET/SDH (10G) • OTN (OTU1/2/1e/2e) with FEC • 10/100/1000BaseT, Gig-E & 10G Ethernet • 1x/2x/4x/10x FC DWDM & OLA 8130NGE 10.7G OTN (G.709) • Transponder cards • Proper provisioning • Power levels • Bit Error Rate tests • FEC (OTN) 100M/GbE 10GbE FC SONET/SDH

  19. New ODU 0 OTN container • ODU0 is a new container size that has been introduced in the G.709 to accommodate efficient transport of Gigabit Ethernet (1.25 Gb/s). OTU1 was not efficient for 1GbE signal with a payload rate of 2.48832Gb/s • ODU0 is half the size of an ODU1 container i.e = 1.244 160 Gb/s • Gigabit Ethernet does not fit in the OPU0 payload, GMP will be use to insert the Gigabit Ethernet rate inside OPU0 rate Note: ODU0 does not have a physical instance (i.e. there is no OTU0), the signal needs to be multiplexed into a higher layer in order to be transported on the OTN network

  20. New ODU 0 OTN container • ODU0 • New multiplexing method1 that allows direct ODU0 multiplexing into ODUk (k=2,3,4) in a single stage • This multiplexer uses Generic Mapping Procedure (GMP) for ODU0 justification control • Where GMP will support various client signals and future new ones. It is a generic procedure for mapping a client signal with any bit rate less than the payload capacity to the ODU.

  21. Technology Overview ODU • ODU0 mapping? • The mapping of a ODU0 into a ODU1 is done using ODTU01 (optical channel data unit tributary ) where the ODU1 structure is divided into two sections and where both ODU0 are map. Each needed ODU0 are mapped in to the payload using GMP to specific timeslot.

  22. Technology Overview • Any client signal can be map into the payload using the below process, where each low order signal will mux into a timeslot and be insert in to the payload

  23. ODUflex • ODUflex is a new OTN variable container introduce in October 2009 • Allows for flexible ODU rates for transparent transport of any client signal, it used a similar process to VCAT except that there is no delay because the signal is map in to the same physical container • Adapted in 2 ways: • For Constant Bit Rate (CBR)client signals • Rate = 239/238 x CBR rate • For GFP-F mapped packet client signals • Rate = N x ~1.25Gbit/s (ODU0) with 1 ≤ N ≤ 80

  24. 40GE/100GE Mapping into OTN • Wide-area Ethernet transport technologies are necessary to support, for example, the connection of Ethernet switches separated by more than 40 km (typical distance supported by Ethernet standards). • ITU-T SG15 is responsible for OTN standardization and IEEE 802.3ba is responsible for 40G/100G Ethernet standardization; both working closely to develop 40GE/100G transport capability over OTN

  25. 40GE/100GE Mapping into OTN 40GE with 64B/66B Transcoding 41.25G Using 1024B/1027B 103.125G 40.117G 40GE 100GE GMP GMP ODU3 40.319G ODU4 104.794G OH 104.355G OH 40.15052G 1x 1x OTU4 OTU3 • Standard 40GE runs at 41.25Gbps and OPU3 payload is only 40.15 Gbps • Therefore, mapping 40GE over OTU3 requires 1024/1027B transcoding adaptation to reduce 40GE coded rate

  26. New OTN OTL (OTU3/OTU4) Client OTUk & bit rate OTU3 = 43Gb/s OTU4 = 112Gb/s OPU OH OCh Payload Unit (OPU) Payload ODUOH OCh Data Unit (ODU) Payload OTU OH OCh Transport Unit (OTU) Payload FEC OTUk signal is transmitted over n lanes OTLk.n OTLk.n OTLk.n OTL type & bit rate OTL3.4 = 10.7Gb/s OTL4.4 = 27 95Gb/s OTL4.10 = 11.18Gb/s 1  2  n

  27. Traditional OTN Structure

  28. New OTN Structure

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