3Com 5500-EI Getting Started Guide - Page 18

Unit LED, LEDs, Solving Problems Indicated by LEDs

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Page 18 highlights

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, PoE utilizationand 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.

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18
C
HAPTER
1: I
NTRODUCING
THE
S
WITCH
5500 F
AMILY
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, PoE
utilizationand 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.