Kanguru Common Criteria Evaluated v1.21 - Manual (Page 26)

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6. Device Self Test
All devices feature an LED that indicates the state of the device as follows:
• After the device has been powered on via USB the LED blinks at about three blinks per second.
This frequency is also kept during and after the initial self test (Power On Self Test or POST), after
boot until the CD-ROM partition mounts, and then the LED is turned off.
• If the POST fails, then the LED blinks at a much higher frequency (16 blinks/s) and the USB
data pins (D+/D-) between host computer and the device are disconnected. The device cannot be
accessed via USB in this case.
• In a normal usage case when accessing the device, the LED blinks at 3 blinks/s. After 2.56 seconds
without the device being accessed the LED turns OFF. When the device is not accessed or it is in
USB suspend state, the LED is off.
Device Self Test