Unit Led; Leds - 3Com 3CR17561-91-US - Switch 4500 26PORT Managed 24 10/100 2 Gbe Stackable RJ45 Getting Started Manual

18 C 1: I
HAPTER NTRODUCING THE

Unit LED

LEDs

S 4500 F
WITCH AMILY
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 68
Table 5 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 68.
Table 5 LED Behavior
LED Color
Unit LED
Green
Green flashing
Green flashing 'f' There has been a fan failure.
Green flashing 't' The Switch is over temperature and unit temperature is
PWR LED
Green
Green flashing
Yellow flashing
Red
Off
Mode LED (3CR17571-91 and 3CR17572-91 only)
Speed Green
Duplex Yellow
PoE Red
Indicates
Power On Self Test (POST) is in progress. During POST a the
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.
The Switch has failed POST. The Unit LED flashes the
number of the test that has failed.
critical.
The Switch is powered-up and operating normally.
Self Test (POST) or Software Download is in progress.
One or more ports have failed POST.
The Switch has failed its Power On Self Test.
The Switch is not receiving power or there is a fault with the
Power Supply Unit.
10/100 Port Speed and Activity, 1000 SFP Status and
Activity, or Stack Status and Activity.
10/100 Duplex and Activity, 1000 SFP Duplex and Activity,
or Stack Activity
10/100 Port showing PoE Information