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An Overview of ITU -T G.709

An Overview of ITU -T G.709. Monowar Hossain York University. An Overview of ITU -T G.709. Agenda. Introduction ITU-T G.709 Frame Structure Optical channel Transport Unit Optical channel Data Unit Optical channel Payload unit Forward Error correction Conclusion.

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An Overview of ITU -T G.709

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  1. An Overview of ITU -T G.709 Monowar Hossain York University

  2. An Overview of ITU -T G.709 Agenda • Introduction • ITU-T G.709 Frame Structure • Optical channel Transport Unit • Optical channel Data Unit • Optical channel Payload unit • Forward Error correction • Conclusion

  3. An Overview of ITU -T G.709 Introduction • Interface for the Optical transport network (OTN) • Concepts borrowed from SONET/SDH • Layered structure • In-service performance monitoring • Protection • Other management function

  4. An Overview of ITU -T G.709 Introduction -continued • Added functionality • Management of optical channels in the optical domain • Forward error correction (FEC) to improve error performance and enable longer optical spans • Provides standardize method for managing optical wavelengths(channels) end to end

  5. An Overview of ITU -T G.709 Introduction -continued • Three line Rates is defined • 2,666,057.143 kbs (optical transport unit 1) • 10,709,225.316 kbs (optical transport unit 2) • 43,018,413.559 kbs (optical transport unit 3) • Constant frame rates • 20.420 kHz (48.971 ms) for OTU1 • 82.027 kHz (12.191 ms) for OTU3 • 329.489 kHz(3.035 ms) for OTU3

  6. An Overview of ITU -T G.709 Frame Structure • Three distinct parts • Overhead area for operation, administration and maintenance function • Pay load area for customer data • Forward error control(FEC) block

  7. An Overview of ITU -T G.709 Frame Structure -continued • Size – 4080 * (4 rows) bytes • Data is transmitted serially beginning at the top left first row followed by the second row and so on.

  8. An Overview of ITU -T G.709 Frame Structure -continued • Size – 4080 * 4 rows • Data is transmitted serially beginning at the top left first row followed by the second row and so on.

  9. An Overview of ITU -T G.709 Frame Structure -continued • Optical Transport Unit (OTU)

  10. An Overview of ITU -T G.709 Frame Structure -continued • OTU overhead • Section Monitoring(SM) – 3 bytes • General communication channel (GCCO) – 2 bytes • Reserved (RS) – 2 bytes

  11. An Overview of ITU -T G.709 Frame Structure -continued • Optical channel Data Unit (ODU) overhead • Reside 1-14 columns of rows 2,3 and 4 • Provide tandem connection monitoring(TCM), end to end path supervision • Client signal adaptation via the optical channel payload unit(OPU)

  12. An Overview of ITU -T G.709 Frame Structure -continued • Optical channel Payload Unit (OTU) • Contains information to support the adaptation of client signal. • Located in rows 1-4 of columns 15 and 16. • Definitions very depending on the client signal being mapped into the OPU payload.

  13. An Overview of ITU -T G.709 Frame Structure -continued • Forward error control(FEC) • 16 FEC blocks of 16 bytes for the row. 64 bytes/frame • Reed-Solomon RS(255,239) code • Uses 16 byte interleaved codecs. • Can correct up to eight symbol errors(correction mood) and detect up to 16 symbol errors in the code (detection mood). • Enables communications to maintain acceptable performance quality in noisy environment. • Provide additional coded data for error checking and error correction

  14. An Overview of ITU -T G.709 Conclusion • Meets two requirements • To cater for the transmission needs of today’s wide range of digital services • To assist network evolution to higher bandwidths and improved network performance • A step further toward optical networks • Question?

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