E2E mode allows you to use your Pivotbox as both encoder and decoder in the same location. This means you are able to review the encoded version of the stream locally as if you are a Callee / end-user. You can use this for testing purposes or can even use the encoded pipeline as your local monitor.
On starting E2E mode you will be able to see the video and audio info captured by your Pivotbox, This will display:
Video resolution and frame rate
Colour space
Audio channels displayed as a PPM
You can change the output settings of your Pivotbox when in E2E mode from the settings menu accessed via the cog button next to 'Start E2E mode'