Polycom Viewstation MP - Manual (Page 89)

System Information
89 ViewStation User’s Guide
The Audio Meter screen indicates the audio level of all audio inputs connected
to the ViewStation.
Near-End Loop
The Near-End Loop screen allows you to test the encoder/decoder of your unit.
This can help you diagnose a problem with a video call. If you send a near-end
loop during a call, the far-site will see a loop of themselves. Press any button on
the remote to stop the loop. When you are finished, highlight the Menu icon to
return to the Diagnostics screen.