인터넷과 Telecom 망의 연동 기술

1999. 2. 4.

ETRI

MPLS 시스템팀 전 병천

2HSN’99

순서 Internet Access over Public NetworksMulti-service Switching ArchitectureNext Generation Public Network

3HSN’99

인터넷 액세스 형태

ISP Network

Data Network(F/R,X.25) PSTN/ISDN

전용선F/R X.25

LANxDSL

DSLAM

PSTN ISDN

CATV

Headend

CableModem

전용선 F/R X.25 ADSL PSTN ISDN CATV

56K~155M 56K~2M ~56K ~155M 1M~8M ~56K ~128K 10~30M

기업 가입자 가정 가입자

CarrierNetwork

Acc

ess

Net

wor

kB

ackb

one

Net

wor

k

광가입자망

4HSN’99

Roles in the Internet Market

InternetUser

PublicTelecom Network

Telecom OperatorInternet Service Provider

or Corporate Intranet

AccessServer

ApplicationServer

ISP’s View

InternetUser

PublicTelecom Network

Internet Access Service Provider

(Telecom Operator)Internet Service Provider

or Corporate Intranet

AccessServer Application

Server

Telco’s View

Ericsson Review 1998

5HSN’99

Network Topology for Internet Access

PSTN

xDSL

MobileAccessServer

Data Network(FR/ATM)

ISP POP

ISPNetwork

CorporateIntranet

Teleco Network

- Residential User- Business User

6HSN’99

Dial-up and xDSL Access

ISP-1

IAS

Data Network

PSTN/ISDN

Modem

ADSLModem

IAS: Internet Access ServerDSLAM: DSL Access Multiplexer

DSLAM

ISP-2

ISP-3POP

POP

POP

7HSN’99

Data Network

- Internet Access Server- DSLAM Access Router- Cable Modem Access Server- Remote Access Server(RAS)- Enterprise Access Router- ISP POP

ATM

Frame Relay

56K~2Mbps

2~622MbpsNetworkProviderArea

Data Network 이용형태 - Internet access - Intranet 구축

FR-ATM Interworking- Network Interworking- Service Interworking

8HSN’99

Internet Service Provider Network

ATM based Data ServiceData Network ISP Network

Access ProtocolATM PVCClassical IP over ATMNHRPMPLS

ATM/SONET/FR

ISP Network

NetworkServiceProvider

ATM/SONET/FR/Etc.

ISP Network

Case1

Case2

9HSN’99

IP Service Models

Overlay Model

Integrated Model

ATM+IP related functions

ATM only function

o Traffic driven shortcut - QoS problem - Signaling overheado Protocol - LANE, MPOA - IPOA, NHRP

o Topology/traffic driven shortcut - Closely related with ATM QoS - Minimize control overheado Protocol - MPLS, I-PNNI, PAR

PVC

10HSN’99

Average Duration of Internet Calls

ISS’97 Notel

4

13.4

28.9

0

5

10

15

20

25

30

Voice call Internet Me t er e d

Rate

InternetFlat Rate

Average Holding Time

Bellcore 1997

11HSN’99

Internet Traffic Impacts on Carrier Networks Increased call blocking Increased dial-tone delay Increased cost/little revenue

ISPPOP

InternetLocal

SwitchTandemSwitch

LocalSwitch

Internet Traffic

LocalSwitch

Voice Traffic

12HSN’99

Internet Traffic Offload Architecture

LocalSwitch

TandemSwitch

ISPPOP

Trunk

TrunkforInternet Traffic

LocalSwitch

TandemSwitch

ISPPOP

Trunk

IAS

IAS Internet

Internet

PacketNetwork

InternetAccessServer

PacketNetwork

Distributed Approach

Centralized Approach

IAS: Internet Access Server

13HSN’99

Centralized Approach(Bellcore)

Signalinggateway

CallController

ISPPOP

Internet

PacketNetwork

No.7 Signaling Netwok

SS7

SS7

TrunkT1/E1

InternetAccess Server

- Call routing- Traffic Management- Call setup

Local Switch

ICR Node

ICR: Internet Call Routing

PSTN(Circuit Switching)

Data Network(Packet Switching)

Source: Bellcore

14HSN’99

IP-PSTN/ISDN Integration

SwitchCore Internet

POP

CallControl

InternetProcessingApplication

PSTN/ISDN Switch

Internet

Server

Subscriber data

Central Office

15HSN’99

Hybrid Network Service

Subscriber Controlled Input via InternetE-Mail Waiting IndicationCall Completion on Internet-busyCall Waiting InternetCall Set up from an Internet sessionVoIP service with simplified access authentication,

and charging methods of the local exchange

16HSN’99

xDSL Application Areas

Telco Network AggregatedTraffic

Applications

InternetServiceProvider

CorporateNetwork

DSL Service

Individual User

Small Business

Branch Office

LAN Extension

Telecommuting

Internet Access

17HSN’99

xDSL

DSL local loop

Customer Premises

DSLAM:DSL termination,ATM aggregation

Backbone:ATM/SONETcell transport,

Layer 2 Aggregation

Remote AccessServer: routing,

security

Internet, Private LANs, Local Servers

ISP, Corporate LAN (NSP)Telco or PTT (NAP)

DSL Line Encoding

ATM Signaling and ILMI

Data Encapsulation, Traffic Shaping, Security

Flow Control, Application Software, Content

18HSN’99

xDSL Encapsulation

xDSL Modem

Local Loop

PC

AAL5/ATM Ethernet

ApplicationSoftware

ADSL

Ethernet Bridging

RFC 1483TCP/IP

Ethernet

AAL5/ATM Ethernet

ApplicationSoftware

ADSL

IP Routing

EncapsulationTCP/IP

Ethernet

ApplicationSoftware

ADSL

ATM Cell ForwardingEncapsulation

TCP/IP

AAL5/ATM25 ATM25

Ethernet PacketForwarding

IP PacketForwarding

End-to-EndATM Connection

19HSN’99

ISP Selection Fixed ISP connectivity

PPP over ATM

PC xDSL ModemDSLAM

RouterATMxDSL

PHY

Ethernet

IP

PHY(xDSL)

ATMPHY

(SDH)

ATMPHY

(SDH)

ATM

AAL5

IP

PHY

L3/L2

PVC

IP/PPP

PHY(xDSL)

ATMPHY

(SDH)

ATM SVC

PHY(25M)

ATMPHY

(xDSL)

ATMPHY

(25M)

ATM

AAL5SVC

xDSL Modem DSLAM

PHY(SDH)

ATM

LLC/SNAP

AAL5

IP/PPP

PHY

L3/L2

Router(ISP-2)PC

ATM25 xDSL SDH

ATMSwitch

Router(ISP-1)

Router(ISP-3)

PHYPHY

(xDSL)

ATM

AAL5Ethernet

LLC/SNAP LLC/SNAP

20HSN’99

ISP Selection PPP with ISP selection

PC xDSL ModemDSLAM

RouterATMxDSL

PHY

Ethernet

IP

PHY

Ethernet

PHY(xDSL)

ATM

AAL5

PHY(xDSL)

ATMPHY

(SDH)

ATMPHY

(SDH)

ATM

Ethernet

AAL5

IP

PHY

ATMPVC

ISP-1

ISP-2

ISP-3

TCP

PPTP

PPP

IP

TCP

PPTP

IP

L2TP

UDP

IP

AAL5

ATMNetwork

Telco Network

DSLAM

xDSL Modem

Router

PC

21HSN’99

Multiservice Switching Architecture

ATM-capable Multiservice Switching System Architecture Architecture that separates the control and user/data plane Open intra-switch interfaces

Source: MSF

22HSN’99

Multiservice Switching SystemSupport integrated voice, video, data, and multimedia

switching and call processingSuitable for high availability networksScalable to large port counts, aggregate bandwidth and

high transaction ratesSupport a broad range of ATM-capable, reserved

bandwidth, guaranteed QoS connection typesDefine a consistent set of protocols for controlling and

interworking services, including voice, ATM PVCs/SVCs, Frame Relay PVCs/SVCs, IP, etc.

Support the development of more efficient and flexible networks

Source: MSF

23HSN’99

VSI(Virtual Switch Interface)

Multiservice Switching and Controller-Switch Interface

Source: MSF

24HSN’99

SwitchingFabric

ATMFrameRelay

CESVoice(POTS/PRI)

ATM

VSI

VoATM Extension

IP

Adaptation Extension

TDM IP

MGCP

COPSMPLSIS-ISBGP

UDP TCP

IPLLC/SNAP

EthernetATM/AAL5Physical Layer(STM1, STM4, …) 10/100/1000Mbps

ControlledElements

ControllingProtocols

CommunicationsInfrastructure

Transport Voice IP

Controller-Switch Interface Protocol Stack

Source: MSF

25HSN’99

Requirements of Controller-Switch Interface

Standard at the physical, link, and network layer Secure communication between the controller and the

Switching/Adaptation Plane complexes High throughput Low latency Easy to parse Support for redundant physical interfaces Remotely manageable Widely implemented on computing platforms Operating system and machine independent

26HSN’99

Virtual Switch Interface (VSI) protocol

Connection Processing Support for pt-pt, pt-mpt, and mpt-pt connection types Support for all ATM Forum and MPLS connection types

Support for multiple services Allow implementation of multiple independent services on single

switching element Supports multiple QoS types

ResynchronizationController/Switch Independence

27HSN’99

ResourceManagement

ResourceManagement

VSI Slave VSI Slave

VSI Master

Controller

VSI Master

Controller

Interfaces

Switch

VSI

Categories of VSI MessagesVSI Messages

Connection Requests Connection Request

Responses Interface Information Switch Information

VSI over ATM LLC/SNAP Encapsulation Default Channel:

VPI=0, VCI=40+slave-id

Source: MSF

28HSN’99

Multi- Service switches incorporate IP engines for integrated IP processing Advanced buffer management and link scheduling capabilities enable QoS promise to become a reality

Multi-Service Network

ATM, Frame Relay, VPN, Internet

29HSN’99

QoS is managed as an End- to- End basisVirtual leased line services offers support for legacy networksCut- through of voice enables toll quality for public communicationsLow priority traffic can be guaranteed a minimum throughput

End- to- End QoS Using A Multi- Service Network

30HSN’99

Common ATM TrunkingService Provider Benefits

Higher multiplexing gain and bandwidth efficiencies Bandwidth cost savings (especially internationally) Common platform for interconnections (via Standards) Trunking uniformity for different Quality of Services Higher trunking capacity to support higher-speed customer access

Customer Benefits Better performance at lower cost Potentially more services and features (Quality of Service) Easier migration and interconnectivity Global seamless services (BT, MCI, Concert, Stentor, Avantel) Consolidation of services under consistent performance

31HSN’99

Network Requirements for Multi-services

Maximize ControlQoS(Quality of Service)SecurityReliability/Availability

Minimize CostUse statistically shared WANsConsolidate linksUse bandwidth efficiently

Virtual Private NetworksLayer 2 VPN: ATM, Frame RelayLayer 3 VPN: IP VPN

32HSN’99

Integrated Virtual Private Network

CNMGateway

Service ProviderNetwork

Operations Center

Enterprise Customer- Proof of SLA(Service Level Agreement)

ISP Customer- VPN Control

CLEC Customer- Outsourced Network Control

Source: NGN’98

33HSN’99

Next Generation Internet

Leased line access via switch ports. Carrier class remote access servers

Label Switching(MPLS) IP aware switched coreHigh degree of QoS

34HSN’99

Internet Traffic

0

200

400

600

800

1000

1200

1400

1600

1998 1999 2000 2001 2002 2003

Total VoiceIPVoIP

Source: ATM Year’98 AT&T

Terabyte/day

인터넷 트래픽의 급격한 증가

인터넷에 의한 텔코 서비스 잠식Voice, Fax기업망 데이터 서비스

새로운 망 구조 요구DWDM, ADSL, Terabit

Router

35HSN’99

Integrated IP-ATM Approach

Source: NGN’98

36HSN’99

Hybrid Backbone Network

Optical Fiber

WDM

SDH

ATMIP

- Best-effort IP Services

- Differentiated IP services- IP VPN, VoIP

- Cell relay- Frame relay- Voice, video

IP over SDH/WDM IP over ATM Telco Services

NetworkServices

37HSN’99

ATM Backbone Network

망 구성 방안

IP over SDH/WDM

IP over ATM

ATMPSTNISDN

FR 전용선 xDSL액세스

IP백본

ATM백본

트래픽이 매년 200~300% 증가신속한 망 구성

수익성 위주의Premium 가입자트래픽 처리

38HSN’99

Next Generation Networks Will...

Be MultiService (ATM, Frame Relay, IP, Circuit)Support high degrees of QoS/CoSBe end-user manageableBe designed for high-speed transport Integrate WDM, ATM, Frame Relay and IP

technologies seamlessly