The file is an Autonomous IOS software image for Cisco Aironet 2600 and 3700 series access points. It is used to convert these devices from "Lightweight" mode (which requires a controller) to "Autonomous" mode (standalone operation). 1. Official Download Source
: Indicates compatibility with specific hardware platforms, primarily the Aironet 2600 and 3600 series : Specifies the Autonomous feature set (standalone IOS). 153-3.JF15 : The specific software release version (IOS 15.3(3)JF15). Cisco Community Where to Download download ap3g2-k9w7-tar.153-3.jf15.tar
: This part usually represents the software version. ap3g2-k9w7-tar
Clean up:
Blog Post: Freeing Your Cisco AP — Converting to Autonomous Mode If you've recently picked up a used Cisco 2602 3602 Access Point download ap3g2-k9w7-tar.153-3.jf15.tar