Creating Custom 3D Network Visualizations with OPNET ModelerÂ®

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1588 Creating Custom 3D Network Visualizations with OPNET Modeler®Reviewing the Ovis process model4. Double-click on the Lab2 Visualizations node to view its associated node model.5. Double-click on the mod processor to view its associated process model.Formatted: Bullets and NumberingThe ‘delay’ state simply schedules an interrupt at 0.1 second to ensure that all the protocolinitializations have been performed, in particular the auto-assignment of MAC addresses.The ‘init’ state assigns a set of callbacks to wireless transmitter channels. These callbacks will beinvoked by the simulation kernel during packet transmission.6. Double-click on the Enter Executive area of the init state to view the initialization code.The initialization takes care of the following operations:a) Retrieve the delay and color attribute values that define the configuration options available inthe “Lab2 Visualizations” node. These are model attributes defined by this process modeland help the user customize the way visualizations are going to be displayed.b) Create the set of Ovis layers to control what to show in the OPNET 3D Network Visualizer.c) Assign the Ovis communication callbacks to each wireless transmitter channel.d) Attach a large translucent sphere or cube to each node to allow better viewing from afar.7. Close the Enter Executive editor when done.Formatted: Bullets and NumberingFormatted: Bullets and Numbering8. Click on the Function Block toolbar button ( ) to review the communication callbacks.Only the callbacks used in this lab have been defined. The other entries are nil pointers.The main callbacks of interest are:CONFIDENTIAL – RESTRICTED ACCESS: This information may not be disclosed, copied, or transmitted in any format without the prior written consent of OPNET Technologies, Inc.© 2010 OPNET Technologies, Inc.Page 38
1588 Creating Custom 3D Network Visualizations with OPNET Modeler®a) Receiver init (rx_init): Obtain the MAC address of the WLAN layer. This is used duringreception to check if a packet is destined for this node or just something that wasreceived due to the broadcast. The MAC address is stored as state associated with thereceiver for later use during receptions.b) Transmission start (xmit_start): Checks if the packet is a WLAN data packet and if thecontent is a bit range from known application traffic. If that’s the case, associate astate with the transmission with appropriate information relative to the packet:• Destination MAC address• Application color• Application Ovis layer• 3D offset: This ensures that lines representing multiple active applications are notobscuring each other by drawing them with slight offsets depending on theapplication type.c) Reception start (rcpt_start): If the transmission has an associated state, use that and thereception’s receiver’s state to create an appropriate line. Each line stays visible forsome simulation time (controlled via attributes of the process model that appear asconfiguration attributes of the visualization configuration node) after which asimulation event invokes a function that destroys the line.A small portion of the reception start code is missing and awaits your input to complete.9. Scroll down to the end of the o1588_lab2_rcpt_start function (line 241) and fill in the missingpart.Deleted:Deleted:Deleted:Formatted: Bullets and NumberingCONFIDENTIAL – RESTRICTED ACCESS: This information may not be disclosed, copied, or transmitted in any format without the prior written consent of OPNET Technologies, Inc.© 2010 OPNET Technologies, Inc.Page 39
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Creating Custom 3D Network Visualizations with OPNET ModelerÂ®

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