How to Start Fiber Optic Topology Projects Using OMNeT++

To create a Fiber Optic Topology project using OMNeT++ has been involves the designing a network for nodes to link through fiber optic connection. Fiber optics has offers the high-speed, long-distance transmission with low latency, and replicating like as networks in OMNeT++ contains the configuration of nodes, fiber optic cables, and considering the features such as transmission rate, signal propagation delay, and possibly the physical layer features of the fiber optic communication system.

Here’s a step-by-step guide to starting a Fiber Optic Topology project in OMNeT++.

Steps to Start Fiber Optic Topology Projects Using OMNeT++

  1. Install OMNeT++ and INET Framework

Previously we initialize, you require having OMNeT++ and the INET Framework installed. OMNeT++ is the replication environment, and INET delivers the different network protocols and models for communication technologies, including fibre optics.

  • Download OMNeT++: From the official website.
  • Download INET Framework: We can clone or download the INET framework from GitHub.

To use INET with OMNeT++:

  1. Next the installing OMNeT++, import the INET Framework into your IDE such as File > Import > General > Existing Projects into Workspace.
  2. Generate the INET project next importing to use the network components offer through INET.
  1. Create a New OMNeT++ Project
  1. Open OMNeT++ IDE.
  2. Select to File > New > OMNeT++ Project.
  3. Choose Simple Network as the project template.
  4. Name your project (e.g., FiberOpticNetwork).
  5. Click Finish to build the project.
  1. Define the Fiber Optic Topology in NED Files

Next, describe the Fiber Optic Topology in NED files. In OMNeT++, networks are modeled using NED files, in which stipulate component, their connections, and parameters. In this case, we will describe the nodes linked through fibre optic onnections.

Example: FiberOpticTopology.ned

This NED file generates a simple fibre optic network through many nodes linked through fibre optic connection.

network FiberOpticTopology

{

parameters:

int numNodes = 4; // Number of nodes in the network

string linkType = “fiberOptic”; // Type of the link

submodules:

// Nodes in the fiber optic network

node[numNodes]: Node;

// Fiber optic links between nodes

link[numNodes-1]: FiberOpticLink;

connections:

// Connect nodes with fiber optic links

for i=0..numNodes-2 {

node[i].out –> link[i].in;

link[i].out –> node[i+1].in;

}

}

Explanation:

  • numNodes: Describe the amount of nodes in the network.
  • node[]: Characterize the network nodes like as computers, routers, etc..
  • link[]: Signify the fibre optic connection among the following nodes.
  • FiberOpticLink: A modifies the module which will model fibre optic transmission among the nodes.
  1. Define Fiber Optic Link and Node Modules

Currently we require stating the Node and FiberOpticLink component. Designed for the fibre optic connection, we can design the simple delay or use a further advanced model that considers broadcast delay, bandwidth, and packet loss.

Example: FiberOpticLink.ned

The FiberOpticLink component designs the fibre optic cable among two nodes. This module contains the parameters metrices for delay, bandwidth, and broadcast features for a fibre optic message.

simple module FiberOpticLink

{

parameters:

@display(“i=block/routing”);

double delay = 5ms;  // Propagation delay for fiber optic link

int bandwidth = 1000; // Link bandwidth in Mbps

gates:

input in;

output out;

}

  • delay: The broadcast delay on the fibre optic connection. Designed for real fibre optics, this delay is normally in the order of microseconds or milliseconds, reliant on the distance.
  • bandwidth: Describes the bandwidth for the fibre optic connection in Mbps.
  • in and out: The gates are receive and transfer the communication by the connection.

Example: Node.ned

Nodes in the network characterize the end devices, routers, or other network entities which communicate the fibre optic connection.

Simple module Node

{

parameters:

@display(“i=device/host”);

gates:

input in;

output out;

}

  • Node: Signify the simple nodes are linked through fibre optic connection.
  1. Define Behavior in C++

After the basic network architecture is setting in the NED files, we can describe the behavior for the FiberOpticLink and Node components using C++ code.

Example: FiberOpticLink.cc

The FiberOpticLink module can be defined to include the propagation delay and bandwidth.

#include <omnetpp.h>

class FiberOpticLink : public cSimpleModule

{

protected:

virtual void initialize() override;

virtual void handleMessage(cMessage *msg) override;

};

Define_Module(FiberOpticLink);

void FiberOpticLink::initialize()

{

// You can initialize additional parameters here if necessary

}

void FiberOpticLink::handleMessage(cMessage *msg)

{

// Simulate fiber optic link behavior, such as delay

// Simulate propagation delay

simtime_t delay = par(“delay”);

send(msg, “out”, delay);

}

In this code:

  • initialize(): This function can be used to initialize any parameters or states.
  • handleMessage(): This function in which the communication for transmission delay is replicated through using the delay parameter. Next the delay, the communication is transfer to the next module.

Example: Node.cc

The Node component can be described the process for incoming communications, like as forwarding to the next hop in the network.

#include <omnetpp.h>

class Node : public cSimpleModule

{

protected:

virtual void initialize() override;

virtual void handleMessage(cMessage *msg) override;

};

Define_Module(Node);

void Node::initialize()

{

// You can add initialization logic if needed

}

void Node::handleMessage(cMessage *msg)

{

// Here you can process incoming messages and forward them

send(msg, “out”);

}

  1. Configure Simulation Parameters in omnetpp.ini

The omnetpp.ini files in which we can set up the replication of parameter metrices like as link delay, bandwidth, and packet sizes.

Example: omnetpp.ini

[General]

network = FiberOpticTopology

sim-time-limit = 100s

**.node*.out.delay = 2ms

**.link*.delay = 5ms

**.link*.bandwidth = 1000Mbps

**.node*.messageInterval = 1s

**.node*.packetSize = 512B

  • Delay: Setting the broadcast delay for fibre optic connection.
  • Bandwidth: Explain the bandwidth for the fibre optic connection for sample 1000 Mbps.
  • messageInterval: Controls the percentage that nodes transfer the communication.
  • packetSize: Describe the packet size for the metrices.
  1. Build the Project

After defining the modules and behavior, build your project:

  1. Right-click the project in the Project Explorer.
  2. Choose the Build Project.
  3. OMNeT++ will compile the code and create the executable.
  1. Run the Simulation

After your project is built, process for the replication:

  1. Right-click on the project and choose Run As > OMNeT++ Simulation.
  2. Then initializes the replication for can be envision for the flow of communication by the fibre optic network.
  3. We will be able to follow the propagation of communication, the delay due to fibre optics, and the overall network behavior.
  1. Visualize and Analyze Results

OMNeT++ offers tools we envision and examine the outcomes for the replication:

  • Simulation GUI: See the replication graphical illustrate, has involves the network topology and packet transmission.
  • scavetool: Examine the outcomes such as duration of communication, delays, throughput, and other acts as the parameter metrics.
  1. Extend the Simulation

After the basic fibre optic network is setting, we can extend the replication through:

  • Simulating different types of fiber optic cables by different bandwidth, delays, and packet loss.
  • Implementing custom protocols: We could apply and validate the protocols model for fibre optic communication, such as low-latency protocols or high-throughput communication methods.
  • Handling larger-scale networks: Enhance the further nodes or connection and validate the performance of network below the loads are increased or in further complete environment.

Conclusion

We start a Fiber Optic Topology project in OMNeT++, you want to:

  1. Install OMNeT++ and the INET Framework.
  2. Describe the fiber optic network structure in NED files, requiring nodes, connection, and transmission parameters metrices.
  3. Apply the behavior of nodes and fiber optic links using C++.
  4. Configure simulation parameters in the omnetpp.ini file.
  5. Build and run the simulation to follow the network behavior for the running process.
  6. Visualize and analyze results using the OMNeT++’s built-in tools envision for examine the outcomes.

You can extend the simulation by exploring more realistic fiber optic models, custom communication protocols, and larger-scale network scenarios.

This procedure has covered the overall demonstration which is essential to know before simulating the Fiber Optic Topology projects into the simulation using OMNeT++ tool. We provide the more answers we will clarify another manual.