Hardware Overview 11
NOTE: When one of the FAN LEDs on the utility side indicates failure, the fan
LED on the I/O panel displays yellow.
Table 3-1. System LED indicators
Feature Detailed Description Comment
System LED
• Solid green–Normal operation. CLI
prompt available
• Blinking green–Boot-up in progress
• Solid yellow–Major Fault. Displays
summary of all major faults within the
system; the faults are traffic affecting
• Blinking yellow–Minor Fault. Displays
summary of all minor faults within the
system; the faults are not traffic affecting
I/O side
Power LED
•Off–No power
• Solid Yellow–POST in progress
• Solid green–Normal operation (dual or
single supply)
• Blinking yellow–One of the power
supplies has failed
I/O side
FAN LED
• Solid green–Fan powered and running at
the expected rpm
• Solid yellow–Fan failed including
incompatible airflow direction when PSU
or fan trays of differing airflows are
inserted in the same chassis
I/O side
MASTER LED
• Solid green–System in stacking Master
mode
• Off – Switch in Slave mode
I/O side
LOCATOR LED
• Off – No power
• Blinking blue – Locator function is
enabled
• Off – Locator function is disabled
I/O side
7-DIGIT Stack LED It indicates a number for stacking. I/O side
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