BROADBAND ISDN SERVICES

ITU-T Definition For B-ISDN a service or system requiring transmission channels capable of supporting rates greater than the primary rates. B-ISDN thus includes 64kbit/s ISDN capabilities in addition opens a door to applications utilising bit rates above 1.5Mbits/s or 2Mbits/s.Bit rates available to broadband user is from 50Mbits/s to hundreds of Mbits/s

B-ISDN PRM DescriptionUser PlaneFor the transfer of user functions like flow control and recovery from error are includedcontrol planeResponsible for the call control and connection control functions. Signalling functions necessary to set up, supervise and release a call or connection are handled.Management Plane includes two types of functions called layer management and plane management functions

B-ISDN CapabilitiesBroadband capabilities 64 kbits/s ISDN capabilities .User- to- network signalling.Interexchage Signalling.User to user signalling.Broadband transfer is provided by ATM.

Overview of B_ISDN CapabilitiesB-ISDN supports switched, semi-permanent and permanent, point- to-point and point to multi-point connectionsprovides on demand, reserved and permanent services.Connections in B_ISDN support both circuit mode and packet mode services of mono and/or multimedia type Also supports a connection less or connection-oriented nature in a bi-directional or unidirectional configuration.B-ISDN will contain intelligent capabilities for the purpose of providing advance services characteristicsSupport powerful operation and maintenance (OAM) tools,and network control management.

Classification of B- ISDN Services Interactive servicesConversational, Messaging and retrieval.Distributed ServicesElectronic publishing and TV programme distribution with existing and future enhanced picture quality.a) With User-individual presentation control.b) Without User-individual presentation control.

Messaging Services

Retrieval Services

Conversational ServicesContinued NEXT PAGE

Conversational ServicesContinued NEXT PAGE

Conversational Services

Distribution Services With user-individual presentation control

Introduction to ATM

Asynchronous Transfer ModeAsynchronous Transfer Mode(ATM) is the transfer mode for implementing B-ISDNATM is a cell-based switching technology.It is designed to a general purpose, connection-oriented transfer mode for a wide range of services.ATM handles both connection- oriented traffic directly or through adaptation layers.ATM can effectively handles either a Constant Bit Rate (CBR) or Variable Bit Rate(VBR).ATM is asynchronous because the transmitted cells need not be periodic.Using SONET/SDH physical transmission media, ATM effectively offers a system to standardize the Multiplexing and switching on one network for very high rate.

ATM applicationATM is a multiplexing and switching technology designed for flexibility at the expense of efficiency.ATM excels for applications with different performance, quality, and business requirements.

Consumer applications for ATMEntertainment imagingWork at home - telecommutingHome shopping servicesVideo on demandE-mail and multimessaging systemsInteractive multimedia applications and games

ATM business driversVirtual networkingSeamless interworkingMore bandwidth for less moneyShared media replacementNew applications

Seamless interworkingProviding the capability to serve voice, video and data using the same technology has been dubbed seamless interworking across the LAN and WAN. VIDEODATAVOICELANsWork groupATM basedinterworkingswitchhub, routerCustomer premisesATM basedinterworkingservicescircuitservicesx.25SMDSIPFramerelayVideoservicesvoicenetwork

More bandwidth for less moneyATM offers the capability to extend the LAN or MAN across WAN at speeds comparable to LAN or MAN for less cost, because the bandwidth and switches are economically shared across many users.

Shared media replacementLAN and MAN technologies connect to network devices through a shared medium. Bandwidth is shared between all users. But when the user rate begins to approach the shared medium's speed, the shared medium has to increase its speed. This is where ATM comes in as a common logical interface technology that can scale in speed without requiring changes in software to support a new shared medium solution.

New applicationsATM also offers enhanced delivery options such as point to multipoint and eventually broadcast. High speed ATM multicast applications may include a broadcast of a videoconferencing application that include text and video.Automatic translation servers could be connected for language conversion between parties speaking different languages.

Virtual private networks Virtual private networks are defined as network partitions of shared public network resources between multiple users to form a private network that appears private to users but is still part of the large public network. Shared network resources are assigned in fair proportion to the bandwidth required by customers.Advantages of the virtual network are: Reduced access line charges Capability to satisfy high peak demands Enhanced reliability

Intelligent data networkIntelligent networks provide some level of value-added services. Examples are: address translation versus interpretation, intelligent routing decisions made within the network, protocol conversion etc...

The making of ATM standards

Standards and Specification BodiesInternational Telecommunication Union (ITU-T)The ITU-T is a United Nation sponsored treaty organisation. USA based and control.American National Standards Institute (ANSI)USA based telecommunication standard body.European Telecommunication Standard Institute (ETSI). European regional bodyATM ForumFormed by there companies : Northern Telecom, Sprint, SUN Microsystems, and Digital Equipment Corporation(DEC).Internet Engineering Task Force(IETF)/IABFR Forum and SDMS Interest GroupVendors, User and NSP also participate in standard making

Standards and Specification bodiesInternational Telecommunications Union (ITU)American National Standards Institute (ANSI)European Telecommunications Standard Institute (ETSI)ATM Forum

Creating StandardsWork PlanMeeting and ContributionsDrafting and ReviewVoting and ApprovalUser Acceptance and InteroperabilityBusiness and Politics

ITU-T B-ISDN RecommendationsI.113 Vocabulary of terms for broadband aspects of ISDNI.121 Broadband aspects of ISDNI.150 B-ISDN asynchronous transfer mode functional characteristicsI.211 B-ISDN service aspectsI.311 B-ISDN general network aspectsI.321 B-ISDN protocol reference model and its applicationI.327 B-ISDN functional architectureI.361 B-ISDN ATM layer specificationI.362 B-ISDN ATM Adaptation Layer (AAL) functional descriptionI.363 B-ISDN ATM Adaptation Layer (AAL) specificationI.413 B-ISDN user-network interfaceI.432 B-ISDN user-network interface - Physical Layer SpecificationI.610 Operation and maintenance principles of B-ISDN access

ANSI StandardsT1.624-1993 BISDN UNI:Rates and Formats SpecificationT1.627-1993 BISDN ATM Functionality and SpecificationT1.629-1993 BISDN Adaptation Layer for Constant Bit Rate Services Functionality and SpecificationT1.635 BISDN ATM Adaptation Layer Type 5

ATM Forum SpecificationsATM User-Network Interface (UNI) Specification Version 4ATM Data eXchange Interface (DXI) SpecificationATM Broadband-Intercarrier Interface (B-ICI) Specification

ATM Cell Transmission and Format

Transportation Example of ATM Principles

Outline Architecture of IN SCPSLPSSPDATABASESCP= Service Control PointSLP= Service Logic Point -- = C7 Signalling Links -- = Traffic PathSSP= Service Switching PointOther SSPsOther SSPs