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SIMULATION

ON. SIMULATION. BROADBAND NETWORK TECHNOLOGY. Network Research Group Universiti Sains Malaysia. Table of Contents. BNT ATM ATM Building Blocks Physical Layer ATM Layer Transmission Delay System Works. OBJECTIVE.

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SIMULATION

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  1. ON SIMULATION BROADBAND NETWORK TECHNOLOGY Network Research Group Universiti Sains Malaysia

  2. Table of Contents • BNT • ATM • ATM Building Blocks • Physical Layer • ATM Layer • Transmission Delay • System Works

  3. OBJECTIVE • This simulator will be developed to provide the user to analyze the factors that should be considered when a packet is sent from one node (source) to another node (destination)in broadband network.

  4. Broadband Network Technology BNT IS BASICALLY A DIGITAL VIRTUAL CIRCUIT FOR MOVING FIXED SIZED PACKETS (CELLS) FROM SOURCE TO DESTINATION AT VARIOUS SPEEDS. BASED ON ATM TECHNOLOGY

  5. ATM Asynchronous Transfer Mode • Fast Packet Switching Technology • Information Transmission Technology • Supports Variable Bit Rate (VBR) & Constant Bit Rate (CBR) information • Connection-Oriented -> Uses pre-established “virtual channels” which are like telephone calls • Requires all end stations to convert information into small, fixed- sized “cells” • Cells are placed on appropriate virtual channel

  6. Plane Management Layer Management Control/User Plane Control User ATM Adaptation Layer ATM Layer Physical Layer ATM BUILDING BLOCKS B-ISDN Reference Model

  7. Physical Layer • Is concerned with transmitting raw bits over a communication channel. • The physical transmission medium • Copper • Fiber

  8. ATM Layer • Has the same function as the Network layer in OSI model • Deals with moving cells from source to destination • It has the characteristic of a network layer protocol:- • End to end virtual circuit • Switching • Routing • It is connection oriented • Four main area will be covered in this layer : • Cell format • Header • Connection Setup • Routing and Switching

  9. Cell Format • Cells are 53bytes (5bytes header and 48bytes payload) • 2 interfaces I) UNI II) NNI • User Network Interface is between a host and an ATM Network • Network Network Interface is between two ATM switches

  10. AAL 5 BYTES 48 BYTES ATM HEADER PAYLOAD ATM Cell Format PHYSICAL ATM Layer

  11. Connection Setup • A connection must be established before a packets is sent (connection-oriented) • A setup message is sent to setup a connection and a release message is to release the connection

  12. Routing • To determine the path taken by a message (virtual path and virtual circuit) • Takes place in ATM Layer • There are many routing techniques :- • Fixed • Flooding • Adaptive Isolated • Distributed • Centralized

  13. Transmission Delay • When packets are sent from source to destination, a transmission time is taken which is the transmission delay. • Transmission delay, T is the time period between the time that the first bit of the message enters to the fiber and the time the last bit of message exits from the other end. • Transmission delay is given by the formula below:- T = L/C + 8N/B + X

  14. L/C - Propagation delay (time taken to send packets from source to destination) 8N/B - Time period the first bit of message exits from the other end and the time that the last bit of message exits there X - Delay in ATM switch ( in most cases the delay is estimated to be less than 10 milisec) • Since it is based on TCP/IP protocols, the propagation delay will be 2 x L/C. This is the time taken to send packets and receive acknowledgement (ACK) from the receiver.

  15. System Works • The user will be allowed to create nodes (transmitter and ATM switch) throughout Malaysia • User are allowed to send packets through any path based on the bandwidth provided

  16. BNT PROGRESS REPORT Preliminary Studies : Research Studies & Information Gathering Phase I : Physical Layer Transmission Of Data Over Communication Channels Phase II : ATM Layer ATM Simulation based on the layer 2 Final Phase : TCP/IP Implementation & Simulation In Putra Jaya

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