The S4810 System | 13
• Power status (PSU)
Additionally, the PSUs and fans have LEDs that indicate their individual status:
• PSU status
• Fan tray status
• System
Table 2-3
 lists the S4810 system LED displays.
In addition to the system LEDs, each port has status indicator LEDs (
Table 2-4
). 
Table 2-3.  System LED Displays
Label LED Color/Display Description
System status
Located on I/O panel
Off
Green blinking
Green solid
Red solid 
Red blinking
No power
Booting, or system in diagnostic mode
Normal operation
Critical alarm
non-critical alarm
Stack Master indicator
Located on I/O panel
Off
Green blinking
Green solid
Unit is a stack member
Unit is the stack standby
Unit is the Stack Master
Fan status
Located on I/O panel
Green solid
Yellow solid
Fan present and working normally
Fan failed or not inserted
Power status
Located on I/O panel
Off
Green solid
Yellow blinking
No power
Normal operation
One power supply failed
Fan tray status
Located on the Fan
Green solid
Red solid
Fan tray present and working normally
Fan tray failed
Power supply status (AC OK)
Located on the PSU
Off
Green solid
No power
Power supply present and working
Table 2-4.  Port LED Displays
Feature Description
QSFP+ Port LED Link LED
• Green—Link up on this port at 40G speed
• Blinking Green—Activity, transmitting, or receiving packet at this port
SFP+ Port LED Link LED
• Green—Link up on this port at 10G speed
• Blinking Green—Activity, transmitting, or receiving packet at this port