Allied Telesis AT-SBx81CFC960 - Manual (Page 67)

SwitchBlade x8112 Chassis Switch and AT-SBx81CFC960 Card Installation Guide
Section I: Hardware Overview 67
FAN
Solid Green Indicates that the fan module is operating properly.
Flashing
Amber Indicates that the fan module has a problem. The
fans are operating below the normal operating
range or have stopped.
Table 17. SYS (System) Status LEDs (Continued)
LED State Description