Specifications

The S55 System | 11
In addition to the system LEDs, each port has status indicator LEDs, described in Table 2-2 .
Table 2-1. System LED displays
Label LED Color/Display Description
Master Off
Green solid
Non-master unit, or stand-alone unit
Stack master unit
Power Supply
(PSU1)
Off
Green solid
Yellow solid
Power supply not present
Power supply present and working
Power supply present, but failed
Fan Module
(FAN1)
Off
Green solid
Yellow solid
Fan tray not present
Fan tray present and working
Fan tray present, but failed
System alarms
(ALM)
Off
Yellow solid
Red solid
No alarm
Minor alarm
Major alarm
System status
(SYS)
Off
Yellow solid
Red solid
No alarm
Minor alarm
Major alarm
Power Supply
(PSU0)
Off
Green solid
Yellow solid
Power supply not present
Power supply present and working
Power supply present, but failed
Fan Module
(FAN0)
Off
Green solid
Yellow solid
Fan tray not present
Fan tray present and working
Fan tray present, but failed
Table 2-2. Port LED Displays
Feature Description
10/100/1000 Port LEDs Link LED (left side of each port)
Green — 1000M
Yellow — 10/100M
Off —No link
Activity LED (right side of each port)
Green — Link up on this port, full traffic
Blinking Green — Activity, transmitting or receiving packet at this port.
Off —No traffic
SFP+ Port LED Link/Activity LED
Green — Link up on this port, no activity taking place
Blinking Green — Activity, transmitting or receiving packet at this port.
Off — No Link detected at this port