IBM Midrange System DS4000 Series Hardware Manual page 66

There are three different HIC cards available. The following figures illustrate the LEDs and
their usage for each host port:
Figure 3-22 describes the LEDs for a 4 GBps FC HIC.
Figure 3-23 describes the LEDs for a 8 Gbps HIC.
Figure 3-24 on page 49 describes the LEDs for a iSCSI HIC.
Figure 3-22 4 Gbps HIC faceplate design
Figure 3-23 8 Gbps faceplate design
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IBM Midrange System Storage Hardware Guide
LED on, only = 1 Gbps link speed
LED on, only = 2 Gbps link speed
Ch 1 Ch 2
LED on, only = 2 Gbps link speed
LED on, only = 4 Gbps link speed
Ch 1 Ch 2
Both LEDs on = 4 Gbps link speed
Ch 3 Ch 4
Both LEDs on = 8 Gbps link speed
Ch 3 Ch 4