3com 4500 Guide D’Installation Rapide
Switch 4500 — Front View Detail
17
Unit LED
The Unit LED is a seven segment display visible on the front of the Switch. The Unit
LED can be used to indicate the unit number in a fabric, POST test ID and software
upgrade information. In the unlikely event of a hardware fault occurring, the Unit
LED may be used to help diagnose the problem. For information on using the Unit
LED for problem solving, see “Solving Problems Indicated by LEDs” on page 52
LED can be used to indicate the unit number in a fabric, POST test ID and software
upgrade information. In the unlikely event of a hardware fault occurring, the Unit
LED may be used to help diagnose the problem. For information on using the Unit
LED for problem solving, see “Solving Problems Indicated by LEDs” on page 52
LEDs
Table 4 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 52.
For information on using the LEDs for problem solving, see “Solving Problems
Indicated by LEDs” on page 52.
Table 4 LED Behavior
Table 4-1
LED
Color
Indicates
Unit LED
Green
Power On Self Test (POST) is in progress. During POST a the
test ID number appears in the Unit LED (seven segment
display).
test ID number appears in the Unit LED (seven segment
display).
or
Software download is in progress. During software
download, a clockwise cycling bar appears in the Unit LED.
download, a clockwise cycling bar appears in the Unit LED.
Green flashing
The Switch has failed POST. The Unit LED flashes the
number of the test that has failed.
number of the test that has failed.
Green flashing ‘f’ There has been a fan failure.
Green flashing ‘t’ The Switch is over temperature and unit temperature is
critical.
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.
Power Supply Unit.
Mode LED (3CR17571-91 and 3CR17572-91 only)
Speed Green
10/100 Port Speed and Activity, 1000 SFP Status and
Activity, or Stack Status and Activity.
Activity, or Stack Status and Activity.
Duplex Yellow
10/100 Duplex and Activity, 1000 SFP Duplex and Activity,
or Stack Activity
or Stack Activity
PoE
Red
10/100 Port showing PoE Information
RPS LED (3CR17571-91 and 3CR17572-91 only)
Green
AC and RPS supply connected.
Yellow
AC failed or not connected. RPS supply is OK.
Off
There is no RPS supply connected.
10BASE-T/100-TX Port LEDs
Speed Green
A high speed (100 Mbps) link is present, blinking off for
every packet received or transmitted.
every packet received or transmitted.
Yellow
A low speed (10 Mbps) link is present, blinking off for every
packet received or transmitted.
packet received or transmitted.
Yellow Flashing
The port has failed POST.