1 High speed access network 초고속 액세스망 Suncheol Gweon TEL:+82-42-866-3890, FAX:+82-42-866-3901, E-mail:[email protected] Korea Telecom Access Network

1

High speed access networkHigh speed access network

초고속 액세스망초고속 액세스망

Suncheol GweonSuncheol GweonTEL:+82-42-866-3890,

FAX:+82-42-866-3901,E-mail:[email protected]

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


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


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)


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)


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


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


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(?)


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


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


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)


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


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 =

=


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


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


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


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


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


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


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


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


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.


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


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)

Documents

1 High speed access network 초고속 액세스망 Suncheol Gweon TEL:+82-42-866-3890, FAX:+82-42-866-3901, E-mail:[email protected] Korea Telecom Access Network