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					KT FTTH network evolution
Access network status, R&D activities on its evolution


Hosung Yoon

KT (Korea Telecom)
Network R&D

2009.3.23
  Broadband Subscribers Statistics – Korea

   FTTH subscribers over 1.7 million (FTTB, FTTC not included)
            xDSL has been rapidly replaced by active Ethernet and FTTH
            Broadband polarization: HFC at a low price vs. FTTx with more bandwidth




       Market Share (Dec., 2008)                            Number of Broadband subscribers in Korea
                                                        7




                                              Million
                                                                              xDSL     HFC      Active Ethernet       FTTH
                                                        6
                                                                                                       15.5 million total

            SO, 18%                                     5

                                                        4
      LG                       KT, 43%
   Powercom,                                            3

      14%
                                                        2
                 SK
            Broadband,                                  1
                23%
                                                        0
                                                            0702
                                                            0703
                                                            0704
                                                            0705

                                                            0707
                                                            0708
                                                            0709
                                                            0710

                                                            0712
                                                            0801
                                                            0802
                                                            0803

                                                            0805
                                                            0806
                                                            0807
                                                            0808

                                                            0810
                                                            0811
                                                            0812
                                                            0701




                                                            0706




                                                            0711




                                                            0804




                                                            0809
   (Source: Korea Communications Comission)
                                                                                       (Source: Korea Communications Comission)




                                                             2
OFC 2009 Workshop (OMD)
  Broadband Subscribers Statistics – KT

                      xDSL : active Ethernet : FTTH = 50% : 30% : 20%
                          We started massive FTTH deployment from 2006 – to
                               survive against severe competition in Korea
                          40% of legacy lines (max. download speed < 50 Mb/s) still
                               remain and need to be upgraded
                          We plan to provide 92% FTTx home pass rate by 2010
                                                                                                             700k customers (Mar., 2009)
                               and 100% rate by 2015
                                                                                                             80k+ VOD titles
                               * FTTx : optical access network to support more than
                                                                                                             42 live broadcast channels
                               50Mb/s maximum bandwidth with QoS guaranteed
                                                                                                             TV shopping, banking, newspaper,
                               (FTTH, Active Ethernet, FTTPole, and some of VDSL)
                                                                                                              education, Karaoke…
                                                KT Broadband Subscribers
                      2,500
   Users (thousand)




                                                                                     6.7 million total
                                                                                           (Mar., 2009)
                      2,000                          29%
                                                               28%


                      1,500
                                                                                   19%


                      1,000
                                13%                                                                              420k customers (Mar., 2009)

                                           8%                                                                    Simple VoIP (WiFi)
                       500
                                                                                                                 Extended video telephony
                                                                          2%                     2%
                         0                                                                                        * SoIP (Service over IP)
                              ATM-ADSL   IP-ADSL   IP-VDSL    Active    FTTPole    FTTH         ETC
                                                             Ethernet    (100M    (EPON)
                                                                        W-PON)

                                                                                           3
OFC 2009 Workshop (OMD)
  What drive our access network evolution

   Traffic increase in the access and the core networks
         Access network : 125% increase annually (7% monthly)
         Core network : 40% increase annually
         Total traffic : 800% increase for the recent 5 years
         Main drivers of traffic explosion : IPTV, P2P, Web video
         Average user traffic is expected to exceed 10Mb/s in mid 2011


   Network optimization (started from 2008)
         To reduce the number of central offices by expanding their coverage

                        400+ COs                                            50 COs
                     4km coverage                                    50km coverage


   What we need in Next Generation access technologies
         Large capacity to accommodate the traffic explosion
         Long reach to extend the central office coverage
         More users per fiber over 256 to save the network optimization cost


OFC 2009 Workshop (OMD)                              4
  Access network evolution strategy – SFU

                   Past                         Today and near-term                               Long-term
         < 1Mb/s sustained                                 ~ 30Mb/s                                > 100Mb/s

Router    DSLAM                              Router EPON OLT                            Router 10GPON OLT


                   copper
                            Home                                       Home                                      Home
             CO             < 4km                                     < 15km                                    < 15km
                                                  CO                                         CO
     fiber                                             fiber                                      fiber
                  DSLAM                                          RE                                       10G-RE


                            copper
                  Cabinet            Home                      Cabinet          Home                      Cabinet         Home
                                     > 4km                                     > 15km                                    > 15km



   Current key technologies for our SFU customers : EPON & reach extenders
            Nationwide EPON deployment started from 2006, replacing xDSL
            In the context of “network optimization”, multichannel (WDM) reach extenders are considered for
                  customers far from our central offices
   In a long-term, we consider 10G-PON (10G-EPON or XG-PON) as an SFU solution


OFC 2009 Workshop (OMD)                                          5
  Access network evolution strategy – MDU & Small businesses

           Past & Today                            Near-term                      Long-term
        ~ 4Mb/s sustained                           ~ 40Mb/s                       > 100Mb/s

 Router                                    Router WDM-PON OLT




   CO                    FES                 CO    fiber
          fiber                                                   FES

              L3 SW                                        AWG


                               APT                                      APT
                   MDF                                      MDF


   We have installed 3.5 million Active Ethernet lines for MDU
            FES located at the basements & Remote L3 switch to aggregate FES uplinks
   In a near-term, we are going to upgrade our MDU access network to provide per-
        user sustained bandwidth over at least 10Mb/s
            Two PON-based solutions : Gigabit WDM-PON and 4-way-split EPON
            By taking the FTTB approach, we can reuse the legacy of the active Ethernet including FES and
                  UTP cabling in our MDU network
OFC 2009 Workshop (OMD)                                    6
  Motivation for WDM-PON initiative

   User sustained bandwidth
         Today, our SFU customers are enjoying ~30Mb/s sustained bandwidth (EPON)
         We need an alternative access solution optimized for the MDU customers which can offer
           equivalent sustained bandwidth with that of EPON FTTH in SFU


   Needs for smooth migration from active Ethernet
         By using WDM-PON, we can easily upgrade the current active Ethernet access network
              remote L3 switches → passive AWG
              FES uplink transceivers → WDM-PON colorless ones

         If we use Giga-PONs (reduced split) for our MDU instead of WDM-PON, more fibers need to
           be installed between the central offices and MDU


   Future-proof and cost efficient systems
         By using WDM-PON, we expect longer equipment lifetime to meet our future bandwidth
           requirement
         Our cost analysis revealed WDM-PON FTTB cost comparable to 4-way-split EPON FTTB
           ones, already in its beginning stage



OFC 2009 Workshop (OMD)                             7
  Trial #1 / Gigabit WDM-PON for MDU FTTB

   Target: FTTB for MDU customers
         Trial period: 2007.12 ~ present
         384 subscribers target (1 OLT)
                                                                                #101        #102
         2~3 ONU per builiding * 6 residential building
         24 customers / ONU with 100BT Ethernet interface


   IP-TV Server Farm                                                                                      ONU
                                                              1Gbps/λ1                                    (Basement)

                                                                    1Gbps/λ2    #103             #104
   IP Premium Network
                        Media SW         16G / fiber
            PE                             1G / λ            RN
                                        λ1,, λ2,…, λ16              MDF
      Kornet
                       Aggr. SW GW-PON                                   1Gbps/λ3
              SER
        (East Suwon Br.)           OLT                                     1Gbps/λ4
                               (Shingal Br.)                                           Riser
                                                                                #105 (UTP:48p)     #106



                                                             QSTB

                                                                    1Gbps/λ15

                                                                          1Gbps/λ16
OFC 2009 Workshop (OMD)                                  8
  Trial #1 / Gigabit WDM-PON Systems at hand

   KT Central Office                                  Trial site
   (Shingal Branch)                              “Good Morning Hill”




         WDM-PON OLT          WDM-PON RN (AWG)            WDM-PON ONU (FES)
         CO (Shingal Br.)           MDF                     Basement Closet

OFC 2009 Workshop (OMD)          9
  Trial #2 / Multichannel EPON reach extender

   For MDU customers
         About 47% of KT customers                  500~2000 households

         Fiber saving by 1/N
           (N: # of WDM channels)


                          CO
                                                                 WDM
                                                                  RE


   Long-reach application
         Replacing local offices or unmanned remote offices by WDM RE

                                                         Unmanned RS
                    CO                                    or local CO


                                      <40km (80%)

                                                                WDM
                        OLT
                       OLT
                      OLT                                        RE



OFC 2009 Workshop (OMD)                         10
  Trial #2 / Multichannel EPON reach extender – field installation

   Network optimization using WDM reach extenders
         Trial period: 2008.8 ~ present
         Using WDM RE, the CO coverage was expanded over 30km
         Alternative technology for the “remote OLT”




                                                                        RT
                                                                 (WDM EPON Repeater)




           COT (WDM MUX)
        with remote supervision




OFC 2009 Workshop (OMD)                           11
  Conclusion – our views

   WDM-PON : suitable for MDU access evolution
         Smoother migration from the current active Ethernet network
         In a simple comparison, WDM-PON provides 4 times as much capacity as 10G-PON
         However, when focusing on the MDU application, WDM-PON’s per-user sustained
           bandwidth is comparable to the current Giga-PON FTTH


   TDM-PON : suitable for SFU access evolution
         Smooth migration from the current 1G-EPON network
         We are studying both of 10G-EPON and XG-PON as a next-gen candidate
         A multichannel reach extender will be a key technology for the access network optimization




OFC 2009 Workshop (OMD)                            12

				
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Description: PON (Passive Optical Network): The progress of information and networking applications, quickly driving the development of the network. The network's total bandwidth to double every six months to promote the rapid rate of increase, the new network applications and network technology continue to emerge. PON technology is going with this trend and move towards the market as a quality and cheap broadband access technology.