Table 1. S5148F-ON switch LED behavior (continued)
LED Description
● Blinking yellow—Power supply failed
Master LED
● Off—Switch is in Stacking Slave mode
● Solid green—Switch is in Stacking Master or Standalone
mode
FAN LED
● Off—No power
● Solid green—Normal operation; fan 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, 1.0Hz—Standby mode
● Blinking green, 0.5Hz—AC power cord unplugged
LOCATOR LED/System Beacon
● Off—Locator function disabled
● Blinking blue—Locator function enabled
7-Segment LED for stacking
● Off—No power
● Solid green—Hex digit representing the stack unit ID
RJ-45 Ethernet Port LED
● Off—no link and no activity detected
● On—Activity on the port
● Solid yellow—10MHz activity
● Solid green—100MHz activiity
● Blinking green—1GHz activity
Table 2. System management Ethernet port LEDs
LED Description
Link LED
● Off—No link
● Solid green—Link operating at a maximum speed,
autonegotiated/forced or 1G
● Solid yellow—Link operating at a lower speed,
autonegotiated/forced or 10/100M
Port activity LED
● Off—No link
● Flashing green—Port activity
NOTE: There are four LEDs for each SFP28 and QSFP28 port. For each port, 100GbE or 40GbE uses only one LED,
2x50GbE uses two LEDs, and 4x25GbE or 4x10GbE uses all four LEDs.
Table 3. SFP28 port LEDs
LED Description
Link LED
● Off—No link
● Solid green—Link operating at maximum speed, 10G
● Solid yellow—Link operating at a lower speed,1G
● Flashing yellow, 1 second on/off—port beacon
Activity LED
● Off—No link
● Flashing green—port activity
10 S5148F-ON switch
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