Asynchronous Transfer Mode (ATM): Basic GROUP 13

Group Member ™MOHD FARRIZ FAIRUZZAMAN AZME WET ™MOHD KHAIRI SHAPIEE WET ™MOHD RASMANIZAN AWANG WET ™NIK MOHD JEFRY JUHARI WET ™NURUL IHSAN BAHARUDIN WET020135

Topics ATM History ATM Concepts ATM Architecture Summary

History of ATM Asynchronous Transfer Mode (ATM) is cell relay protocol Designed by ATM Forum and adopted by the ITU-T and B-ISDN Allow high-speed interconnection of all the world’s networks ATM can be thought of as the “highway” of the information superhighway ITU-T : International Telecommunations Union-Telecommunation Standardization Sector B-ISDN: Broadband Integrated Services Digital Network

ATM Technology Both LAN and WAN Technology One International Standard Voice/Data/VideoMbGb QoS Carries Multiple Traffic Types Scalable in Speed Distance StandardsBased QoS = Quality of Service A

ATM Basic Concepts Negotiated Service Connection  End-to-end connections, called virtual circuits  Traffic contract Switched Based  Dedicated capacity Cell Based  Small, fixed length A

Negotiated Service Connection  Parameters  Traffic Characteristics  Peak Cell Rate  Sustainable Cell Rate  Quality of Service  Delay  Cell Loss Traffic Contract Virtual Connection 1-QOS A Virtual Connection 1-QOS B Virtual Connection 1-QOS b

The ATM Cell Small Size  5 Byte Header  48 Byte Payload (user information – may be less than 48 bytes) Fixed Size Header contains virtual circuit information Payload can be voice, video or other data types Header 5 Bytes 48 Bytes Payload A 53 Bytes

ATM System Architecture Adaptation Layer (AAL): Inserts/extracts information into 48 byte payload ATM Layer: Adds/removes 5 byte header to payload Physical Layer: Converts to appropriate electrical or optical format End Station Switch Voice Data Video AALAALAALAAL PHYPHY PHYPHY ATMATM PHYPHY ATMATM PHYPHY ATMATM AALAALAALAAL Voice Data Video Cells

ATM Adaptation Layer Provides Mapping Of Applications To ATM Service Of The Same Type Segments/Reassembles Into 48 Payloads Hands 48 Byte Payloads To ATM Layer 48 Bytes AALTypes 1 Circuit Emulation -Constant Bit Rate (CBR) Low Bit Rate Voice (Real Time) -Variable Bit Rate (VBR) -Variable Bit Rate (VBR) Time Invariant Data “Simple” Data 2 3/4 5 A

ATM Layer Adds/Removes Header To 48 Byte Payload Header Contains Connection Identifier Multiplexes 53 Byte Cells Into Virtual Connections Sequential Delivery Within A Virtual Connection } 48-BytePayloads From AAL 5-Byte Header Header Contains Virtual Path and Channel Identifiers 53-Byte Cell To Physical Layer A

Physical Layer Speed Matching and Framing CablePlants Wide Range of Speeds LAN, MAN, WAN Compatibility Uses Existing Media Twisted Pair Coax Fiber -Multimode -Single Mode -Single Mode TransmissionFrame A

Advantages of ATM Scalability&FlexibilityScalability&Flexibility ATMATM SimplifiedNetworkInfrastructureSimplifiedNetworkInfrastructure Accommodation of mixed media traffic Accommodation of mixed media traffic

ATM Device Server ATM ATM E-net TR ATM Device Server ATM ATM E-net TR WAN Campus/MAN LAN/Desktop LAN=MAN=WAN ATM Switch Simplified Network Infrastructure

Accommodation of Mixed Media Video Data Voice

Standards Semiconductor Vendors Customers Network Equipment Providers STANDARDS GROUPS - ITU-T, TS (CCITT) - ANSI - ETSI - IETF... Carriers and Service Providers SoftwareDevelopers ATM Forum

 Integration of LAN/MAN/WAN/MAN  Supported By Standard And Industry Forums  Supports Current And Future High-Bandwidth Applications And Protocols  Independent of Physical Interface  Interoperability With Conventional Technology  Increased End-To-End BW  Switch Based, Connection Oriented  Small, Fixed Length Cell A ATM Features

ATM Benefits  Simplified Networking And Architecture  Better Multivendor Compatibility  Long Architectural Lifetime  Supports Current Cable Plant  Migration Occurs At User’s Pace  Dedicated And Deterministic Bandwidth  One Network For All Traffic  Supports New Applications

Summary ATM combines a new set of networking features Connection oriented, based on switch technology and fixed length cell Uses existing cable plants Wide range of speed and distance Designed for LAN/MAN/WAN/MAN applications Evolution, not revolution, from existing networks and applications ATM is real and there is wide participation from all market segments B