Table 5. S4100–ON Series LED behavior(continued)
LED Description
● Solid green—Normal operation; fan that is powered and
running at the expected RPM
● Solid yellow—Fan failed—including incompatible airflow
direction when you insert the PSU or fan trays with
differing airflows.
PSU LED
● Off—No power
● Solid green—Normal operation
● Solid yellow—Power supply critical event causing a
shutdown.
● Blinking yellow—PSU warning event; power continues to
operate.
● Blinking green, 1.0 Hz—Standby mode
● Blinking green, 0.5 Hz—AC power cable unplugged
Locator LED/System Beacon
● Off—Locator function is disabled.
● Blinking blue—Locator function is enabled.
7-Segment LED for stacking
● Off—No power
● Solid green—Hex digit representing the stack unit ID
RJ45 Ethernet LED
● Off—no link and no activity detected
● On—Activity on the port
● Solid yellow—10 MHz activity
● Solid green—100 MHz activity
● Blinking green—1 GHz activity
Table 6. System management Ethernet port LEDs
LED Description
Link LED
● Off—No link
● Solid green—Link operating at a maximum speed—
autonegotiated/forced or 1G port
● Solid yellow—Link operating at a lower speed—
autonegotiated/forced or 10/100M port
Activity LED
● Off—No link
● Flashing green—Port activity
Table 7. SFP+ and unified SFP+ port LEDs
LED Description
Link LED
● Off—No link
● Solid green—Link operating at maximum speed—10G port
● Solid yellow—Link operating at a lower speed—1G port
● Flashing yellow, 1 second on/off—Port beacon
Activity LED
● Off—No link
● Flashing green—Port activity
NOTE: There are four LEDs for each QSFP+, QSFP28, and unified QSFP28 port. For each port, 100 GbE or 40 GbE uses
only one LED, 2x50GbE uses two LEDs, and 4x25GbE or 4x10GbE uses all four LEDs.
Table 8. QSFP28 and unified QSFP28 port LEDs
LED Description
Link/Activity LED
● Off—No link
S4100–ON Series switch 15
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