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EE450-Lab3-Nazarian-Summer2011_old

EE450-Lab3-Nazarian-Summer2011_old - Laboratory Ethernet A...

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Laboratory Ethernet A Direct Link Network with Media Access Control Objective This lab is designed to demonstrate the operation of the Ethernet network. The simulation in this lab will help you examine the performance of the Ethernet network under different scenarios. Overview The Ethernet is a working example of the more general Carrier Sense, Multiple Access with Collision Detect (CSMA/CD) local area network technology. The Ethernet is a multiple-access network, meaning that a set of nodes sends and receives frames over a shared link. The carrier sense in CSMA/CD means that all the nodes can distinguish between an idle and a busy link. The collision detect means that a node listens as it transmits and can therefore detect when a frame it is transmitting has interfered (collided) with a frame transmitted by another node. The Ethernet is said to be a 1-persistent protocol because an adaptor with a frame to send transmits with probability 1 whenever a busy line goes idle. In this lab you will set up an Ethernet with 14 nodes connected via a coaxial link in a bus topology. The coaxial link is operating at a data rate of 10 Mbps. You will study how the throughput of the network is affected by the network load as well as the size of the packets.
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2 Procedure Create a New Project To create a new project for the Ethernet network: 1. Start OPNET IT Guru Academic Edition Choose New from the File menu. 2. Select Project Click OK Name the project < your initials>_Ethernet , and the scenario Coax Click OK . 3. In the Startup Wizard: Initial Topology dialog box, make sure that Create Empty Scenario is selected Click Next Choose Office from the Network Scale list Click Next Assign 200 to X Span and keep Y Span as 100 Click Next twice Click OK . 4. Close the Object Palette dialog box. Create the Network To create our coaxial Ethernet network: 1. To create the network configuration, select Topology Rapid Configuration . From the drop-down menu choose Bus and click OK . 2. Click the Select Models button in the Rapid Configuration dialog box. From the Model List drop-down menu choose ethcoax and click OK . 3. In the Rapid Configuration dialog box, set the following eight values and click OK . Local area networks (LANs) are designed to span distances of up to a few thousand meters. The eth_tap is an Ethernet bus tap that connects a node with the bus. The eth_coax is an Ethernet bus that can connect nodes with bus receivers and transmitters via taps.
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3 4. To configure the coaxial bus, right-click on the horizontal link Select Advanced Edit Attributes from the menu: a. Click on the value of the model attribute Select Edit from the drop- down menu Choose the eth_coax_adv model. b. Assign the value 0.05 to the delay attribute (propagation delay in sec/m).
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