20 CHAPTER 1: INTRODUCING THE SUPERSTACK 4 SWITCH 5500 FAMILY
Unit LED The Unit LED is a seven segment display visible on the front of the Switch.
The Unit LED can be used to diagnose hardware faults, display POST test
ID, display Stack ID, display PoE utilization and software upgrade
information. For information on using the Unit LED for problem solving,
see “
Solving Problems Indicated by LEDs” on page 78.
LEDs Table 5
lists LEDs visible on the front of the Switch, and how to read their
status according to color. For information on using the LEDs for problem
solving, see “
Checking for Correct Operation of LEDs” on page 40.
Table 5 LED behavior
LED Color Indicates
10/100/1000BASE-TX Port LEDs
Speed Green A high speed (1000 Mbps) link is present, blinking off
for every packet received or transmitted.
Yellow A low speed (10/100 Mbps) link is present, blinking
off for every packet received or transmitted.
Yellow flashing The port has failed POST.
Off No link is present.
Duplex Green Full duplex, blinking off for every packet received or
transmitted.
Yellow Half duplex, blinking off for every packet received or
transmitted.
Yellow flashing The port has failed POST.
Off No link is present.
PoE Green Power is being delivered to the port.
Green flashing Port power has exceeded limit or is unable to supply
power due to unit being over budget.
Yellow PoE error, no power supplied on port.
Yellow flashing The port has failed post.
Off No power is being delivered.
10/100BASE-T/TX Ports LEDS
Speed Green A high speed (100 Mbps) link is present, blinking off
for every packet received or transmitted.
Yellow A low speed (10 Mbps) 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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