18 CHAPTER 1: INTRODUCING THE SWITCH 4200G FAMILY
LEDs Table 4 lists the LEDs that are 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 58.
Flashing “F” Mode LED steady red Fan failure detected.
Flashing “t” Mode LED flashing red The switch is too hot; temperature is critical.
“C” Mode LED green or yellow The switch is a clustered commander unit.
“c” Mode LED green or yellow The switch is a clustered candidate unit.
“S” Mode LED green or yellow The switch is a clustered slave unit.
“1” Mode LED green or yellow The switch is not clustered.
Table 3 Status Display (continued)
Display Mode LED Color Description
Table 4 LED Behavior
LED Color Indicates
PWR LED
Green The Switch is powered-up and operating normally.
Green flashing The 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.
Duplex Yellow 10/100 duplex and activity, 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.
10014914_AB_Switch 4200G.book Page 18 Tuesday, October 2, 2007 12:13 PM
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