3Com Switch 5500-EI User Manual

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18 CHAPTER 1: INTRODUCING THE SWITCH 5500 FAMILY
Unit LED The Unit LED is a seven segment display visible on the front of the Switch.
The Unit LED indicates the unit number in a fabric, POST test ID, and
software upgrade information. In the unlikely event of a hardware fault
occurring, you can use the Unit LED to help diagnose the problem. For
information on using the Unit LED for problem solving, see
“Solving
Problems Indicated by LEDs” on page 82.
LEDs Table 5 lists the 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 43.
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.
10014925-AD_S5500_GSG.book Page 18 Thursday, August 16, 2007 12:29 PM

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