Technology & Implementation: Broadband Access Network in Korea: Technology & Implementation : Broadband Access Network in Korea Aug. 2004. Hye-Won Shin, You-Jin Sim Technology Investigation & Evaluation Center, KT


Contents: Contents DSL Overview KT’s DSL Network Architecture Broadband Market Growth in Korea DSL Technologies (Solutions) Frequency Spectrum & Performance Comparing ADSL2/++ to LR-VDSL Interoperability ADSL IOP VDSL IOP Strategy Broadband Access Network Deployment Roadmap of Broadband Access Network Evolution Scenarios (FTTC-xDSL, Near FTTH, FTTH)


Slide3: KT’s DSL Network Architecture KORNET VDSL MODEM DSLAM -filter ATU-R NAS DSLAM Giga Switch GSR L3 Switch Ntopia Switch Metro Switch FES L3 Switch Customer Local CO Regional CO Core


Slide4: Broadband Market Growth in Korea BBWF2004


Slide5: ADSL2++ 20M VDSL DSL Technologies (Solutions) 4M 8M 13M 25M 50M 100M ADSL 10M VDSL ADSL2+ LR VDSL 50M VDSL 100M VDSL VDSL2


Frequency Spectrum & Performance: Frequency Spectrum & Performance USO ADSL ADSL2+ 25 kHz 138 kHz 1.1 MHz 2.2 MHz 3.75 MHz Short-reach VDSL Long-reach VDSL (2-band) DS1 US2 DS2 US1 138K 3.75M 5.2M 8.5M 12M US0 25K 1.1M 2-band (Long Reach) 3/4-band DS1 ADSL2++


Frequency Spectrum & Performance: Frequency Spectrum & Performance


Comparing ADSL/2/++ to LR-VDSL : Comparing ADSL/2/++ to LR-VDSL Bit-Loading • ADSL: 2~15bit, ADSL2++: 1~19bit, VDSL: 2~11bit Aggregated DS total power Cyclic Extension • Longer CE reduces transmission efficiency Operations • Loop Diagnostics • Power Management • On-line Configuration ADSL2++ LR-VDSL Loop Length Vs. Cyclic Extension


ADSL Interoperability : ADSL Interoperability  Prepared for ADSL IOP Criteria & Test Suits in 2001 - 41 kinds of ATU-Rs certified by May 2003


VDSL Interoperability Strategy: VDSL Interoperability Strategy  VDSL Systems Deployed in Korea  Plan to guarantee interoperability Dual Line Codes Each Line Code Minimize # of chipsets & systems


Roadmap of Broadband Access Network: Roadmap of Broadband Access Network Evolution Scenarios to FTTH FTTC : Fiber (CO ↔ BB-x) + VDSL ( → Home) Near FTTH : Fiber (CO ↔ BB-x) + UTP ( → Home) FTTH : finally substitute the last VDSL/UTP section with fiber cable


FTTC Cell Design & BB Family: FTTC Cell Design & BB Family Most household is located within average 2.2km from CO  In VDSL, several “1 Km-cell”s cover one CO. Cell scale : Large / Medium / Small  coverage & residential density Outdoor cabinet family : BB-Shelter/Manhole/Cabinet/Pole/Wall BB-Shelter/Manhole Large coverage & high density BB-Cabinet Medium coverage & density BB-Pole/Wall Small coverage & low density BB-x Issues Space acquisition Environmental Conditions Control func. of temp. & humidity Remote-monitoring Battery, …


Near FTTH: Near FTTH Definition FTTC + UTP (Similar services with FTTH : bidirectional 100Mbps max.) Ethernet to the Home General features & merits Easily & economically migrate to FTTH Provide more differentiated service-level (price, quality, contents) speed & connection stability Multicasting(IP-TV), high quality VoD, Video phone, speed limit per port Don’t concern any more about establishing & managing of various/complex MODEM in Home Don’t use TP cables for networking  no quality degradation according to cable env. Near FTTH (Apartment)


Near FTTH (Fiber to the Pole/Wall): Near FTTH (Fiber to the Pole/Wall) Service positioning When BBC/BBS space for VDSL can’t be acquired in residential area Highly competition area for speed or high quality Gradual change from copper ADSL Optical transmission technologies AON (100Mbps) WDM-PON (100Mbps) E-PON (100Mbps) Near FTTH (Residential)


Near FTTH – WDM-PON Field Trial (small scale): H Pole #1 Pole #2 Pole #3 Pole #4 Pole #5 Near FTTH – WDM-PON Field Trial (small scale) Status Period / Area : Sep. & Dec.2003 ~ / Busan # of DWDM-PON system : 3 # of ONU (at pole) : 28 (average 73p per ONU) # of applied household : 66 (Mar.2004)


Slide16: Thank You