Dell HBA355i User Manual page 14

Table 3. LED behavior for HBA355e
LED state
Off
Green
Amber
14 Features of Dell HBA355i and Dell HBA355e
LED status
None of the external devices are connected.
When enclosures are connected and all the x4 lanes are linked up.
When a device is connected and not all the x4 lanes are linked up.
NOTE: Tape drives have only x1 lanes and the default LED color will be
Amber when they are connected. This is an expected behavior.