To simulate a Fibre Channel Arbitrated Loop (FC-AL) topology using MATLAB that comprises to make a circular network in which numerous nodes (devices) are interact over a shared fiber channel. In FC-AL, every single device on the loop need “arbitrate” to get access to the channel before it can transmit information. This access control avoids collisions and makes sure that only one device sends data at any time.
We offer series of steps on how to simulate a simple Fibre Channel Arbitrated Loop topology in MATLAB.
Steps to Simulate Fibre Channel Arbitrated Loop (FC-AL) Topology
- Define the Circular Loop Structure:
- Organize nodes within a circular layout in which each node is associated to their two neighbors.
- Describe a unidirectional or bidirectional data flow over the loop.
- Simulate the Arbitration Process:
- Enable each node to ask for access to the channel.
- Only the node which effectively gets the arbitration can send data, even though others need to wait.
- Implement Transmission Delays and Access Control:
- Measure the transmission delay according to the distance amongst nodes.
- Monitor which node is presently holding the “token” (access to the channel) and make obligatory a waiting period for other nodes.
- Visualize the Loop and Transmission Activities:
- Monitor the parameters like successful transmissions, waiting times, and transmission delays.
- Indicate the physical loop layout and transmission activities using MATLAB plots.
Example Code for Simulating Fibre Channel Arbitrated Loop (FC-AL)
Following is a MATLAB example for replicating a basic FC-AL topology with arbitration.
% Parameters for FC-AL Simulation
numNodes = 6; % Number of nodes in the loop
simulationTime = 30; % Duration of the simulation in seconds
dataRate = 1000; % Data rate in bits per second
packetSize = 100; % Packet size in bits
distanceBetweenNodes = 100; % Distance between neighboring nodes in meters
propagationSpeed = 2e8; % Propagation speed in meters per second
arbitrationProbability = 0.3; % Probability that a node requests arbitration per time step
% Calculate Propagation Delay Between Nodes
propagationDelay = distanceBetweenNodes / propagationSpeed;
% Initialize Transmission and Arbitration Logs
transmissions = zeros(numNodes, simulationTime); % Track transmissions per node
arbitrationRequests = zeros(numNodes, simulationTime); % Track arbitration requests
currentTokenHolder = 1; % Start with the first node holding the token
% Simulate Data Transmission with Arbitration in FC-AL
for t = 1:simulationTime
% Each node decides if it wants to request the token
for node = 1:numNodes
if rand() < arbitrationProbability
arbitrationRequests(node, t) = 1; % Node requests arbitration
disp([‘Time ‘ num2str(t) ‘s: Node ‘ num2str(node) ‘ requested arbitration.’]);
end
end
% Token holder transmits if it had requested arbitration
if arbitrationRequests(currentTokenHolder, t) == 1
transmissions(currentTokenHolder, t) = 1; % Log successful transmission
disp([‘Time ‘ num2str(t) ‘s: Node ‘ num2str(currentTokenHolder) ‘ transmitted data with delay ‘ num2str(propagationDelay) ‘s’]);
end
% Pass the token to the next node in the loop
currentTokenHolder = mod(currentTokenHolder, numNodes) + 1;
end
% Visualize Loop Layout and Transmission Activity
nodePositions = [cos(linspace(0, 2 * pi, numNodes + 1)’) * distanceBetweenNodes, sin(linspace(0, 2 * pi, numNodes + 1)’) * distanceBetweenNodes];
nodePositions = nodePositions(1:end-1, :); % Remove the last point to avoid overlap
figure;
plot(nodePositions(:, 1), nodePositions(:, 2), ‘bo-‘, ‘MarkerSize’, 8, ‘LineWidth’, 1.5);
hold on;
text(nodePositions(:, 1), nodePositions(:, 2), arrayfun(@num2str, 1:numNodes, ‘UniformOutput’, false));
title(‘Fibre Channel Arbitrated Loop (FC-AL) Topology’);
xlabel(‘X Position (m)’);
ylabel(‘Y Position (m)’);
axis equal;
hold off;
% Plot Transmission and Arbitration Activity
time = 1:simulationTime;
figure;
subplot(2, 1, 1);
imagesc(arbitrationRequests);
colorbar;
title(‘Arbitration Requests Over Time’);
xlabel(‘Time (s)’);
ylabel(‘Node ID’);
subplot(2, 1, 2);
imagesc(transmissions);
colorbar;
title(‘Data Transmissions Over Time’);
xlabel(‘Time (s)’);
ylabel(‘Node ID’);
Explanation of the Code
- Parameters:
- numNodes describes the number of nodes within the FC-AL topology.
- distanceBetweenNodes and propagationSpeed are utilized to compute the propagation delay amongst each node.
- Token Arbitration Process:
- At each time step, every single node selects whether to request access to the channel depends on the arbitrationProbability.
- The node presently holding the token can be sent if it requested access.
- The token is forwarded to the next node in order, after each time step.
- Transmission Tracking:
- The arbitrationRequests matrix records the arbitration requests, even though the transmissions matrix logs effective data transmissions.
- Visualization:
- The initial plot indicates the circular layout of the FC-AL topology with nodes are organised in a loop.
- The second collection of plots displays the arbitration requests and data transmissions over time, which demonstrating that nodes requested and sent data.
Analysis and Extension Ideas
- Variable Transmission Delay: Replicate the changing propagation delays rely on random distances amongst nodes.
- Token Hold Time: Enable nodes to hold the token for several time steps to mimic burst transmissions.
- Dynamic Arbitration Probability: Fine-tune arbitrationProbability actively to replicate diverse network loads.
- Error Handling and Retransmission: Execute error verification to replicate the cases in which a transmission fails and essential to retried.
- Bidirectional Loop: Change the code to prevent the bidirectional data flow that replicating a dual-loop FC-AL set up for redundancy.
Throughout this manual, we learnt and get more essential information to replicate and execute the Fibre Channel Arbitrated Loop Topology projects using MATLAB environment. We will deliver in-depth insights and more innovative approach to you in another manual.
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