refer to the FTOS Command Line Reference Guide for the S4820T System and the FTOS Configuration
Guide for the S4820T System.
LED Displays
As shown in the following figures, the S4820T includes LED displays on the front and back of the chassis.
The tables provide a detailed description of each LED’s meaning.
Figure 3. Port LEDs
1. Diag LED (Green) 2. Temp LED (Red)
3. Stack LED (Blue/Green) 4. Locator LED (Blue)
5. FAN LED (Green/Red) 6. System LED
7. Link LED (Green/Yellow) 8. Activity LED (Blinking Green)
Table 1 provides a detailed description of each LED for the S4820T system.
Table 2. System LED Displays
Feature LED Color/Display Comment
System LED
• Solid blue –— Normal
Operation
• Blinking blue –— Booting
• Solid red –— Critical system
error
• Blinking red –— Non-critical
system error (fan fail, power
supply fail)
I/O side
TEMP LED
• Off –— Normal temperature
• Solid red–Overtemp (Refer to
the NOTE that follows this
table.)
PSU side
10
The S4820T Switch
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