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Why is it recommended to monitor VBUS for a self-powered design? What is back-voltage test?

April 26, 2017design monitor recommended self-powered Test Vbus

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Why is it recommended to monitor VBUS for a self-powered design? What is back-voltage test?

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A self-powered design can differentiate between suspend and disconnect condition only by monitoring VBUS. As per USB specification when VBUS is removed the device must remove power from D+/D- pull-up within 10s. Back-voltage test is used to test this. A self-powered design which does not monitor VBUS will fail this test.