Install Guide

Figure 8. S4112T–ON AC and DC I/O-side LEDs
1 RJ-45 port LED 2 QSFP28 port LED
3 Stack ID 4 Master LED
5 System LED 6 Power LED
7 Fan LED 8 Locator LED/System beacon
9 RJ-45/RS-232 LED
Table 2. S4112–ON Series LED behavior
LED Description
System Status/Health LED
• Solid green—Normal Operation
• Flashing green—Booting
• Solid yellow—Critical system error
• Flashing yellow—Noncritical system error, fan failure, or power
supply failure
Power LED
• O—No power
• Solid green—Normal
• Solid yellow—POST is in process
• Flashing yellow—Power Supply failure or loss of power
redundancy
FAN LED
• O—No power
• Solid green—Fan powered and running at the expected RPM
• Flashing yellow—Fan failed or loss of cooling redundancy
PSU LED
• O—No power
• Solid green—Normal
• Flashing yellow—PSU failure
• Flashing green—FW update
Locator LED/System Beacon
• O—Locator function is disabled
• Flashing blue—Locator function is enabled
S4112–ON Series switch 11