18 CHAPTER 1: INTRODUCING THE SWITCH4200G FAMILY
LEDs Table5 lists LEDs visible on the front of the Switch, and how to read their status. For information on using the LEDs for problem solving, see “Solving Problems Indicated by LEDs” on page 54. Rotating bar segment Mode LED flashing green Software download in progress.
Flashing “F” Mode LED steady red Fan failure detected.
Flashing “t” Mode LED flashing red Switch is too hot; temperature is critical.
“C” Mode LED green or yellow Switch is clustered Commander unit.
“c” Mode LED green or yellow Switch is clustered Candidate unit.
“S” Mode LED green or yellow Switch is clustered Slave unit.
“1” Mode LED green or yellow Switch is un-clustered.
Tabl e 4 Status Display (continued)
Display Mode LED Color Description
Tabl e 5 LED Behavior
LED Color Indicates
PWR LED
Green The Switch is powered-up and operating normally.
Green flashing Self Test (POST) or Software Download is in progress.
Yellow flashing One or more ports have failed POST.
Red The Switch has failed its Power On Self Test.
Off The Switch is not receiving power or there is a fault with the
Power Supply Unit.
Mode LED
Speed Green 10/100 Port Speed and Activity, Gigabit SFP Status and
Activity, or Stack Status and Activity.
DuplexYellow 10/100 Duplex and Acti vity, Gigabit SFP Duplex and
Activity, or Stack Activity.
10/100/1000BASE-T Port LEDs
Speed Green A high speed (1000 Mbps) link is present, blinking off for
every packet received or transmitted.
Yellow A low speed link is present, blinking off for every packet
received or transmitted.
Yellow Flashing The port has failed POST.
Off No link is present.
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