LED Description
Master LED
• O—system is the stack slave
• Solid green—System is the stack master or a standalone unit
7-segment LED
• O—No power
• Solid green—displays a hex digit representing the stack unit ID
Table 3. System management Ethernet port LEDs
LED Description
Link LED
• O—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
Activity LED
• O—No link
• Flashing green—Port activity
Table 4. SFP+ port LEDs
LED Description
Link LED
• O—No link
• Solid green—Link operating at maximum speed—10G on an
SFP+ port
• Solid yellow—Link operating at a lower speed—1G on an SFP+
port
Activity LED
• O—No link
• Flashing green—Port activity
• Solid blue, 1 second on/o—Port beacon
NOTE: There are four LEDs for each 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 5. QSFP28 port LEDs
LED Description
Link/Activity LED
• O—No link
• Solid green—Port link operating at maximum speed—100G on a
QSFP28 port or 40G on a QSFP+ port
• Flashing green—Port activity operating at maximum speed—
100G on a QSFP28 port
• Solid yellow—Port link operating at a lower speed
• Flashing yellow, 1 second on/o—Port beacon—Port activity at
100G on a QSFP28 port
Link/Activity LED—4x25G mode or 4x10G mode
• O—No link
12 S4112–ON Series switch
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