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High speed access networkHigh speed access network
초고속 액세스망초고속 액세스망
Suncheol GweonSuncheol GweonTEL:+82-42-866-3890,
FAX:+82-42-866-3901,E-mail:scgweon@photon1.kotel.co.kr
Korea TelecomAccess Network Research Lab.
Feb. 12, 1998Feb. 12, 1998
HSN ’98HSN ’98
Korea Telecom HSN ‘98 2
ContentsContents
Status of Korean Access Network Evolution of Subscriber Network
TP based evolution Optical fiber based evolution Wireless based evolution
xDSL concepts and trials FITL trials Related Standards
Korea Telecom HSN ‘98 3
KT Access NetworkKT Access Network
24 M switching capacity (1996) , 20 M subscribers (1997.5) Average distance between CO and subscriber is relatively short : 2.2 km 95% subscribers are within 5.5 km Bridged taps less than 2%
2.2 km 5.5 km
Korea Telecom HSN ‘98 4
Evolution of Subscriber NetworkEvolution of Subscriber NetworkTP based evolution (1)TP based evolution (1)
ISDN 2B1Q 2B+D (144 kbps) : BRA (Basic Rate Access) 23B+D (or 30B+D) : PRA (Primary Rate Access)
HDSL (High data rate Digital Subscriber Line) T1 or E1 rate with 2 pairs 2B1Q Modulated every major vendor (PairGain)
ADSL (Asymmetric Digital Subscriber Line) Internet, VOD like application (asymmetric bandwidth allocation) ~6-8 Mbps (down), 64 kbps (up) DMT, CAP every major vendor (GlobeSpan) * RADSL(Rate Adaptive DSL)
Korea Telecom HSN ‘98 5
Evolution of Subscriber LoopEvolution of Subscriber LoopTP based evolution (2)TP based evolution (2)
SDSL (Symmetrical Digital Subscriber Line) T1 or E1 rate with single pair video conferencing every major vendor (Paradyne)
CDSL (Consumer Digital Subscriber Line) 1Mbps modem technology to facilitate residential DSL deployment Rockwell(CAP), Lucent’s WildWire(DMT) don’t need a splitter Interoperability issue with Alcatel’s DSLAM
VDSL (Very high data rate Digital Subscriber Line) drop line with FTTC application ~155Mbps(down) depending on distance CAP-16, DMT,QAM (DAVIC)
Korea Telecom HSN ‘98 6
Evolution of Subscriber Network Evolution of Subscriber Network Optical Fiber based evolutionOptical Fiber based evolution
HFC (Hybrid Fiber Coaxial) CATV network upgrade FTTLA (Fiber To The Last Amplifier) 750 MHz, 1GHz
FTTO (Fiber To the Office) No objections, but priority COT,RT FLC (Fiber Loop Carrier)
FTTC (Fiber To The Curb) FTTZ (Fiber to The Zone) : Japan HDT, ONU using VDSL Powering and CATV issues
FTTH (Fiber To The Home) Ultimate goal (BISDN), but economy issues to be solved Home Network
Korea Telecom HSN ‘98 7
Evolution of Subscriber Network Evolution of Subscriber Network Wireless based evolution (1)Wireless based evolution (1)
Multichannel Multipoint Distribution Service (MMDS) Analog CATV channel distribution for rural area ~ 50 km 2.5 ~2.7 GHz, 6-8 MHz/channel 2.535 ~ 2.655 GHz (Korea) - 20 channel upgrade: 16 QAM --> 25-28 Mbps
Local Multipoint Distribution Service (LMDS) Applicable urban area for multimedia services ~ 5km (FTTC concept) 27.5 ~ 29.5 GHz (USA), 40.5 ~ 42.5 GHz (Europe) 26.7 ~ 27.5 GHz (Korea) *LMCS (up:24.25-24.75, down:25.5-26.7) 16 QAM (rain attenuation, noise, interference) --> QPSK
Korea Telecom HSN ‘98 8
Evolution of Subscriber Network Evolution of Subscriber Network Wireless based evolution (2)Wireless based evolution (2)
Wireless Local Loop (WLL) Economical point of view (rural area, duct congestion etc) Newly competition with existing local operator CDMA techniques Terminal : 2.3 ~ 2.33 GHz (Korea) Local station : 2.37 ~ 2.40 GHz
Personal Communication Services (PCS) CDMA or TDMA ~1.8 GHz (Korea)
Future Public Land Mobile Telecommunication System (FPLMTS) vs. UPT(Universal Personal Telecommunication) -- from wired
network Wireless services (cellular, wideband beeper etc) integration with
single terminal IMT-2000 (International Mobile Communications-2000) ~ 2GHz, CDMA(?)
Korea Telecom HSN ‘98 9
Comparisons of xDSLComparisons of xDSL
Central Office
(PSTN)
Central Office
(PSTN)
Central Office
(PSTN)
Central Office
(PSTN)
EndUser
(POTS)
EndUser
(POTS)
Headend(Video)
Headend(Video)
EndUser
(Video)
EndUser
(Video)
Headend(Video)
Headend(Video)
EndUser
(Video)
EndUser
(Video)
PSTN POTS
OpticalNetwork
Unit
OpticalNetwork
Unit
POTS
ADSL CO Unit
ADSLRT Unit
HDSLRT Unit
HDSL CO Unit
VDSLRT Unit
VDSL CO Unit
LineRepeater
LineRepeater
CO Repeater
EndUser
(POTS)
EndUser
(POTS)
PSTN
T1/E1
HDSL
ADSL
VDSL
TP (2 pairs)
TP (1 pair)
TP (2 pairs)
0.3~1km 1~1.8 km 0.3~1km
TP (1 pair)
SPF
Korea Telecom HSN ‘98 10
HDSLHDSL
Bi-directional high-bit-rate digital subscriber lines 1.544 Mbps over 12 kft line without repeater Dual duplex: two transceivers (Two nonloaded twisted pairs) Design guide line: Carrier Serving Area (CSA) Technology: 2B1Q
1.5 MbpsI/F
Circuit
Transceiver 1
Transceiver 2
1.5 MbpsI/F
Circuit
Transceiver 1
Transceiver 2
HTU-C HTU-R
1.544Mbps
1.544Mbps
CSA Loop
CSA Loop
784 kbps
784 kbps
Korea Telecom HSN ‘98 11
ADSLADSL
Asymmetric bi-directional digital subscriber line- Multimedia services environment- Wideband downstream- POTS (Plain Old Telephone Service) supported
Environments- One twisted pair (nonloaded)- Upto 18 kft (ADSL I: 1.5 Mbps)
4 10 80 90 100 400 4
PowerSpectra
POTS ISDN ADSL(Up)
ADSL (Down)
Korea Telecom HSN ‘98 12
VDSLVDSL
Very high-data-rate digital subscriber line FTTC application
- Connection from ONU to the subscriber’s premises
analogbandpass
filter
analogbandpass
filter
Diplexer
16 CAPTX
QPSKRX
down
up
Network device User device
analogbandpass
filter
analogbandpass
filter
Diplexer
16 CAPTX
QPSKRX
Korea Telecom HSN ‘98 13
Line Codes for xDSLLine Codes for xDSL
DMT : Discrete Multitone - Multicarrier modulation, ANSI T1.413- Amati Comm., Stanford Univ.
Freq. Freq. Freq.
Freq. Freq. Freq.
SignalPower
SignalPower
ChannelGain
ChannelGain Noise
Bit /Ch
Bit /Ch
x
x =
=
Korea Telecom HSN ‘98 14
Line Codes for xDSLLine Codes for xDSL
CAP : Carrierless Amplitude/Phase Modulation- Bellcore, AT&T
Encoder
Inphasefilter
Quadraturefilter
+ DAC LPFInputsignal
CHANNEL
Decoder
Inphasefilter
Quadraturefilter
Outputsignal ADC
Decisiondevice
Korea Telecom HSN ‘98 15
Comparisons for high speed Comparisons for high speed internet accessinternet access
ISDN Single Pair HDSL ADSL Cable Modem
Speed DownSpeed Up
128 kbps128 kbps
768 kbps768 kbps
1.5 ~6 Mbps64~640 kbps
27 Mbps135 kbps (Shared by 200 uses)
Major Application Internet Access,Transparent LANservices
Internet Access,Transparent LANservices, VideoConferencing
Internet Access,Video on demand
Internet Access
Reach with24 Gauge Wire
18 kft CSA(12 kft)c 12~18 kft NA(18 kft)
SimultaneousPOTSover same pair?
Yes, digital delivery Yes, optional bydigital timestop,line powered
Yes,analog based.
Yes, optional digitaldelivery
ProvenTechnology?
Yes,~400,000 lines inNorth America
Yes,~200,000 lines inNorth America(2P)
Small trials starting Large trials starting
Deploymentreadiness
90% of wire centersready(requires COswitch upgrade)
80% of customersin reach
80% of customersin reach
8 % of plantcurrently ready forbidirectional services
Availability forVolumedeployment
Today Today Today 1998
Korea Telecom HSN ‘98 16
ADSL Trials in USADSL Trials in US
Carrier Start date Location Number of
participants
Vendor Commercial
service rollout
Ameritech Oct., ‘96 Wheaton, IL 200 customers Alcatel 15,000 lines (’98)
Bell
Atlantic
Sept., ‘96 Fairfax County,
VA
100- 500 Westell won’t estimate
BellSouth Sept., ‘96 Atlanta 50- 60 Various 28,000 lines (’98)
GTE Feb., ‘96 Dallas/Ft. Worth 30 employees Amati, Westell Early ‘97
GTE Aug., ‘96 Redmond, WA 100 MS/GTE
employees
Amati, Westell
Nynex Aug., ‘96 Boston 60 Lotus
employees
Westell 2nd half of ‘97
Pacific
Telesis
Aug., ‘96 San Ramon, CA 11- 100 Westell 2nd half of ’97,
widespread in ‘98
SBC J une, ‘96 Houston 12 Shell Oil/SBC
employees
Alcatel Mid ‘97
US West April, ‘96 Boulder, CO
Minneapolis
St.Paul
10 employees HDSL- Pairgain,
ADSL- Westell
HDSL 1st half of ’97
followed by ADSL
Korea Telecom HSN ‘98 17
KT’s FITL PlanKT’s FITL Plan
FITL Schedule 1995: FLC-A/B for FTTO application 1998: FLC-C for FTTC application 2002: FLC-H for FTTH application
Mature FITL in 2015 ~ 100 % for FTTO 50 % for FTTC 25 % for FTTH ~ US $ 12 Billion investment by 2006 ~ US $ 30 Billion investment by 2015
Korea Telecom HSN ‘98 18
Characteristics of FLC systemsCharacteristics of FLC systems
구 분 FLC- A 시스팀 FLC- B 시스팀 FLC- C 시스팀 FLC- H 시스팀개발기간 ’92 ~ ‘94 ’94 ~ ‘95 ’95 ~ ‘97 ’98 ~ ‘01
상용화 1995 1996 1998 2002(예정)
용 도 대형 상업건물 중소형 건물 수요밀집지역 개인주거용
전송속도 STM- 1
(155 Mbps)
STM- 1 STM- 4
(622 Mbps)
STM- 1
접속방식 PTP PTMP Active star ADS/PDS
장치용량 음성급 1890 회선DS1 급 84 회선DS3 급 3 회선
(좌동) 음성급 180 회선IVS 64 회선(1 ONU 당)
1 user
서비스 일반전화, 2W/4W
E&M, T/D, R/D,
DPO/DPT, DDS
DS1,DS1E,DS3
(좌동)+
64XN Kbps
ISDN, 착발신공중전화
일반,공중전화,
ISDN,DS1,
DS1E, VOD
ATM
ATM based
service
기 타 SLMOS 연동 DELMONS 연동 V5 I/F 추진
* FLC-A ( 기본형 ), FLC-B (Fiber-To-The-Building), FLC-C (FTTCurb), FLC-H (FTTHome)* 각 장치별로 수요에 따른 개량형이 예상됨 FLC-E (Enhanced FLC-A): 채널셀프의 용량을 현 120 가입자에서 300/600 가입자로 확장 FLC-D : 중소용량 (400 가입자 이하 ) 가입자
Korea Telecom HSN ‘98 19
Operations of FLC-A/BOperations of FLC-A/B
RS422
RS422
KT'sTelephone
Office
LAN
PowerMonitoringTerminal
CONT
TBOS : Telemetry Byte Oriented Serial
* Acronym
COT : Central Office Terminal RT : Remote TerminalDCC : Data Communication Channel
PWR : PoWeR
CONT : CONTroller of powers
* Legend
RS-422
Power related INFOExchange through DCCPower related INFOExchange through RS-422
COT
RT
TBOS
PWR
TBOS
FLC-A/B for FTTO Business building a
pplications SDH based architec
ture (STM-1) POTS, Coins, 2/4 E
&M, Dataport, 64XN kbps, ISDN, DS1/1E, DS3 etc
Composed of COT and RT
Korea Telecom HSN ‘98 20
Operations of FLC-COperations of FLC-C
KT's CustomerPremises
X.25O
NU
-Pow
er r
elat
ed I
nfo
TMN(Q3/CMIP)
ATMNetwork
STM-1
PSTNNetwork
DS1ETelecom. Shelf
Power Supply
Batteries
Door Open
RS-422
STM-4c
PowerOperationCenter
PowerMonitoringTerminal
HDTn : Agent
HDT1:AgentFMS(Manager)
STB
ONU
FMS : FLC Management System
STB : Set Top Box
OutdoorONU Cabinet
CMIP : Common Management Information Protocol
FLC-C for FTTC Residential area a
pplication mainly for apartment complex
ATM based architecture
Interfaces with V5 and ATM exchanges
POTS, Coins, DS1/1E, IVS using VDSL technology
Composed of HDT (CO) and ONU (Remote)
Korea Telecom HSN ‘98
ATM ATM 기반 통합 액세스노드 시스템기반 통합 액세스노드 시스템 --ETRIETRI
FTTC
FTTH
HFR
HFC
동선
splitter
air
동축
NTU
xDSL
NTU
PON
NTU
LMCS
NTU
모뎀
ONU
xDSL
ONU
LMCS
ONU
E/O
Internet
TMN
PSTN
ATM Core Net
ISP
VSP
CATV HE
SNI
Q3
LIC
LIN
LIR
LIX
LIP
LIB
LIB
LIV
운용관리부
제어부
SXC
LIB : Line Interface - Broadband LIC : Line Interface - FTTC LIN : Line Interface - PON LIP : Line Interface - POTS LIV : Line Interface - Video Broadcast SXC : Service X-Connect
155Mb/s
622Mb/s
Korea Telecom HSN ‘98 22
StandardizationStandardization
xDSL ANSI T1E1.4
T1.413 ADSL standard (DMT) HDSL2, CAP based RASDL and VDSL Doc. 97-131R3 rev.12 (System requirements for VDSL)
ETSI STC TM6 DTR/TM-06003-1 (Functional/electrical requirements for VDSL) DTR/TM-06003-2 (Linecode/duplexing method for VDSL)
ITU-T SG15 (SG13) ADSL Forum
ATM cells over ADSL (TC layer) IEEE P.1007 / 802.14 (for VDSL) DAVIC ATM forum
covers only ATM over ADSL and VDSL
Korea Telecom HSN ‘98 23
High speed access revenues High speed access revenues (US $M)(US $M)
1997 1999 2002 20062 to 10 MbpsMedium to large business 690 1,072 1,175 696SOHO 70 514 3,784 5,234Residential 104 584 4,364 13,046Total 864 2,170 9,323 18,97610 to 55 MbpsMedium to large business 810 2,258 6,017 8,542SOHO 15 162 3,285 15,230Residential 14 114 2,450 13,312Total 839 2,534 11,752 37,08455Mbps and higherMedium to large business 280 1,137 5,037 11,537SOHO 0 0 1,083 10,182Residential 0 0 676 7,528Total 280 1,137 6,796 29,2472Mbps and HigherMedium to large business 1,780 4,467 12,229 20,775SOHO 85 676 8,152 30,646Residential 118 698 7,490 33,886Total 1,983 5,841 27,871 85,307
0
10,000
20,000
30,000
40,000
50,000
60,000
70,000
80,000
90,000
1997 1999 2002 2006
year
55Mbps andhigher
10 to 55 Mbps
2 to 10 Mbps
Source: Communications Insustry Researchers Inc.
Korea Telecom HSN ‘98 24
Standardization Standardization
FTTx- PON ITU-T SG15
G.982 (PON optical access network) G.POC (Passive Optical Components)
ITU-T SG13 G.902 (Framework for Access Network)
ATM Forum RBB group RBB baseline document draft (BTD-RBB-001.07) RBB PHY baseline document draft (BTD-RBB-PHY-001.01)
DAVIC DAVIC 1.0 specification :FTTH (PON) architecture
Full Service Access Network (FSAN): Gx FSAN G.982 frame + ATM FSAN network requirements specification Issue1
Korea Telecom HSN ‘98 25
FSAN Requirements SpecificationFSAN Requirements Specification
Configuration: FTTx (x=Cab/C, B, H)
Bit rate between OLT and ONU 155Mbps upstream, 622Mbps downstream (option1) 155Mbps upstream, 155Mbps downstream (option2) 255Mbps upstream, 155Mbps downstream (option3), x=H
Optical Access Network (OAN): PON with passive splitters (16-32 way split)
Bit Transport System(BTS) between OLT and ONU ATM oriented
Drop techmology VDSL (copper pair or coax)
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