The activity light turns on when the system reads from or writes to the hard drive.
5. Universal Audio port 
Connect headphones or a headset (headphone and microphone combo).
6. USB 2.0 (480 Mbps) with PowerShare port
Connect devices such as external storage devices and printers. Provides data transfer speeds of up to 480 Mbps.
NOTE: PowerShare enables you to charge your USB devices even when your system is turned off.
NOTE: If a USB device is connected to the PowerShare port before the system is turned off or in hibernate state, you 
must disconnect and connect it again to enable charging.
7. USB 2.0 (480 Mbps) port
Connect devices such as external storage devices and printers. Provides data transfer speeds of up to 480 Mbps.
8. USB 3.2 Gen 2x2 (20 Gbps) Type-C port
Connect devices such as external storage devices, printers, and external displays. Provides data transfer speeds of up to 20 
Gbps.
NOTE: This port does not support video/audio streaming.
9. USB 3.2 Gen 2 (10 Gbps) port
Connect devices such as external storage devices and printers. Provides data transfer speeds of up to 10 Gbps.
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Figure 2. Back view
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Views of OptiPlex Tower Plus 7020