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Telecommunication Systems Spring 2010

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Telecommunication Systems Spring 2010. synchronous ransfer ode. A. T. M. ATM. What is a Transfer Mode ? The way an information is transferred over the network Synchronous Transfer Mode (STM)

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Presentation Transcript
slide2
synchronous

ransfer

ode

A

T

M

slide3
ATM
  • What is a Transfer Mode?
    • The way an information is transferred over the network
  • Synchronous Transfer Mode (STM)
    • In this mode, the information is transferred as soon as it is generated (without any delay), as a continuous stream of data
    • Best suited for speech, video and other real time applications which can not afford delays in transmission
    • Restricted to a fixed (allocated) bandwidth
slide4
ATM
  • What is the advantage/disadvantage of fixed bandwidth??
    • Dedicated for a connection (always available). Suited for constant bit rate applications
    • Can not be shared/used by another connection when free
    • Inflexible for variable bit rate applications (multimedia applications)
    • Inefficient bandwidth utilization
slide5
ATM
  • Packet Transfer Mode (PTM)
    • In this mode the bursts of data are packed and then transferred over the network
    • Packing of data causes delay in transmission
    • Suited for applications that can afford delay, for example file transfer, LAN communication etc.
slide6
ATM
  • What is the advantage with PTM?
    • Efficient bandwidth utilization
  • What is the disadvantage with PTM?
    • Packets of variable length, not suited for constant bit rate applications
    • Each packet may take a separate path to the destination
    • More processing is involved at intermediate routers so more delay
slide7
ATM
  • Asynchronous Transfer Mode?
slide8
ATM
  • ATM combines the STM and PTM
  • ATM can transfer data of any type, any bandwidth and any frequency
slide9
ATM
  • The term Asynchronous??
    • The data rates to be transmitted need not comply with a specific bandwidth
    • The transmission is only performed if there is data to be transmitted
    • No bandwidth is occupied when there is no data to be transmitted
slide10
ATM
  • Asynchronous Transfer Mode?
    • A network technology for both local and wide area networks that supports real time voice, video as well as data
    • The technology uses switches that establish a logical circuit from end to end, and guarantees quality of service
    • ATM is widely used as a backbone technology in carrier networks and large enterprises
slide11
ATM
  • Asynchronous Transfer Mode?
    • ATM is highly scalable and supports transmission speeds of 1.5, 25, 100, 155, 622, 2488 and 9953 Mbps
    • Basic Network Architecture
slide12
ATM
  • ATM basic network architecture
    • ATM can be used for the inter-connection of local data networks
slide13
ATM
  • ATM Network Architecture
slide14
ATM
  • ATM Switch
slide15
ATM
  • ATM Principles??
    • Any type of information is divided into fixed size packets and then transmitted
slide16
ATM
  • ATM Principles??
    • The information is packed and transmitted right away, without delay
    • As compared to STM, ATM has advantage that the transmission rates can be varied
slide17
ATM
  • ATM Principles??
    • ATM cells are generated only when required
    • Available bandwidth is exploited flexibly to meet the challenging requirements
slide18
ATM
  • ATM Principles??
    • If a user wants to call a multimedia application, the following bandwidth is required
    • Even within an application, only the required amount of bandwidth is provided
slide19
ATM
  • Information Packing !!
    • Information is packed into cells in order to be transmitted
    • Irrespective of the service, all cells have the same size
slide20
ATM
  • Information Packing !!
    • The information field is also known as payload
    • It transmits the segmented user information
    • The cell header main task is to route the ATM cell through the ATM network
slide21
ATM
  • ATM Connections !
    • Prior to the transmission of payload, a connection must be setup via subscriber signaling
    • Payload is then transmitted via this connection
    • The connection is cleared down again via subscriber signaling
slide22
ATM
  • ATM Connections !
    • Cells are routed using the identifier in the cell header
    • All cells of a connection take the same route
slide23
ATM
  • ATM Connections !
    • Path of a connection through the ATM network is specified, no physical resources are reserved, because the bandwidth of the connection must be flexible
    • If channels were reserved, the information would be restricted to a fixed bandwidth
    • Connections established without reservation of physical resources are called virtual ATM connections
slide24
ATM
  • ATM Connections !
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