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Application of long and medium distance systems in large networks

Petr Boček, Pavel Schlitter TTC MARCONI s.r.o. (c) 2005. Application of long and medium distance systems in large networks. OTN open concept - teory vs. practice. OTN standardization bodies approach intervendor compatibility at various levels and scenarios

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Application of long and medium distance systems in large networks

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  1. Petr Boček, Pavel Schlitter TTC MARCONI s.r.o. (c) 2005 Application of long and medium distance systems in large networks

  2. OTN open concept - teory vs. practice • OTN standardization bodies approach • intervendor compatibility at various levels and scenarios X G.872 Scenario 1 (single OCh hand over) is sufficient • Practical issues to be solved • high price and low flexibility of traditional line-based DWDM systems <= electrical regeneration <= suboptimal OTS / OMS length • complexity and heterogenity of the dark fiber environment => discrete compensation at NE, adaptive methods Cesnet505_E

  3. O-ICN / OXC – arbitrary network topology • no regeneration in electrical plane for add/dropped signals • less transponders due to extentension of the OCh trail effective length • Automatic spectrum equalization • pre-emphasis at Tx transponder port • re-emphasis at the R-OADM or LE-OLA site depending on the real spectrum • Plug‘n‘play • considarable savings of commisioning effort • flexible in operation, circuit provisioning • extended resilliance in case of network failure Cesnet505_E

  4. Opaque back-back terminal vs. O-ICN / OXC OXC EXC EXC EXC • Opaque (electronic) OXC • regeneration of each channel at O/E/O conversion • Hybrid solution with full optical by-pass • static pre-configured connections at OPP • dynamic connection provisioning – controlled space switch within OXCs • no regeneration in electronics in both the cases what gives potentially longer OCh trails Opaque Hybrid - static Hybrid - dynamic Cesnet505_E

  5. O-ICN / OXC – practical results • Pan-European core network of 28 nodes • design simulations with both the static and dynamic OXC types • 38% transponders in OXC transit points (mix of 2.5G/10G channels) • up to 30% transponder count savings at dynamic OXC to static one (10G channels) Cesnet505_E

  6. G.709 – Transversal Compatibility Base OTU1 2.5Gb/s OTU2 10Gb/s SOH 16 x VC4 OTU3 40Gb/s • Transparency • transmission of the signals with non-SDH format • direct mapping of various types signals • multiplexing into OTU-2 • transparent STM-1/4 mapping • Overhead functionality • performance monitoring • embedded management channels • FEC (standard Reed-Solomon 239-255, propriet. EFEC with another 2dB OSNR gain) • JC, PJO/NJO • BIP-8, BDI/BEI, SD to ETSI • TTI OCh PAYLOAD ODUk TC OPUk PAYLOAD OH OH TCM OH OTUkFEC 2.5G CBR GFP Cesnet505_E

  7. Optical modulation – path to the optimization 1 0 -1 0 200 400 600 800 1000 1200 1400 • RZ modulation • ring-shaped pulse with optimized duration • no need to proceed limitting the Tx power • pulse shape is corrected due to controlled dispersion • Duobinary modulation (DBM) • three-state NRZ modultion at Tx with „polarity“ alternation • no changes in the NRZ receiver • spectrum broadening at 40Gb/s less then ½ relative to the rate • extended dispersion tolerance (+2400ps/nm) in metro application (10G) 43G DBM 43G Duobinary Cesnet505_E

  8. Battle with dispersion means Eye Diagram after 3000km LEAF with optimal Pre/ Post Compensation disperse ps/nm “post” pre km 20ps/div • basic condition for OCh trail length extension • Controlled dispersion • high absolute dispersion reduces ISI • pre-compensation allows for ISI reduction due to non-linear effects (soliton) • residual dispersion optmized to the modulation used Cesnet505_E

  9. Battle with dispersion means II z adapt. algorithm chnl replica AGC ADC MLSE DMUX x y x’ chnl MLSE • Transponders with correction in the electric plane (MLSE) • 10G NRZ • dispersion model of the link optimized via feed-back • performance tests at 2004, application for mertro and LH/ELH systems in MSA package • Tx tunable across whole the band Cesnet505_E

  10. Main features four DWDM application options diferring in attenuation and dispersion maps and modulation used client signals of 155M to 40G rates covered optional subrack types, more NE‘s in one subrack optional fixed or controlled OXC extends considerably the applicable topology set customers are returning back – during 2,5 years 18% European market gained now 30 networks incl. TI, BT, Telstra, TeliaSonera, Vodafone group first to the market with some leading-techolgy components Amcom IP1 project 16 x 10G line, 31 x 24dB (~ 92km) through desert area loop testing - 5745km of unregenerated transmission DTAG Global Seamless Network testing polygon for ASTN 40G DBM transmission demo MHL3000 – successful product Cesnet505_E

  11. Petr Boček, Pavel Schlitter bocek@marconi.ttc.cz+ 420 234 052 321 Thanks for your attention !Any questions?

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