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Environment/Versions Spirent TestCenter. Port Speed License. Answer Connect to the chassis with the test module on which you want to install the license. Select Tools > Licensing Management in the main window menu. The Licensing Management window will open. Go to the Test Module tab and make sure View By: Speed is selected. Select the Test Module on which you want to install the license. Click Install to display the Install License File dialog box. Browse to the folder that contains the license file (*.json) you want to install. NOTE: If you are installing licenses on more than one module, you can combine multiple *.json files into one zip file. Then, browse to the *.zip file you created, instead of to an individual *.json file. Spirent TestCenter application will install all licenses in the zip file on the test modules in the connected chassis. Select the license file and click the Open button. This will start the license installation. The previously installed licenses are overwritten. Disconnect from the chassis, and then reconnect to it. This action is required to reload the license into the Spirent TestCenter application cache on your computer. Related articles: FAQ19444 - Spirent TestCenter: What Modules and Appliances require Speed Licenses.