3Com 3CR17251-91 - Switch 5500G-EI Stackable Gigabit..., Getting Started Manual, Page: 22 / 148

22 C
HAPTER
1: I
NTRODUCING THE
S
UPER
S
TACK
4 S
WITCH
5500 F
AMILY
Unit LED
Green Power on Self Test (POST) is in progress. During POST
a 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.
Green flashing The Switch has failed POST. The Unit LED flashes the
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.
Stack LED
Green The XRN stack is functioning in resilient mode. Loop
cable is attached.
Green flashing Switch is not compatible with the other Switches in
the stack.
Yellow The XRN stack is functioning without the loop
connection.
Off Stacking Cables are not connected.
Module LED (Switch 5500G-EI only)
Green The Module is installed and operating normally.
Yellow flashing The Module is installed but not supported or faulty.
Off The Module is not installed.
Mode LED
Duplex Yellow 10/100/1000 Duplex and Activity, 1000 SFP Duplex
and Activity, or Stack Activity.
Speed Green 10/100/1000 Port Speed and Activity, 1000 SFP
Status and Activity, or Stack Status and Activity.
PoE Red 10/100/1000 port showing PoE information.
RPS LED
Green AC and RPS supply connected.
Yellow AC failed or not connected. RPS supply is OK.
Off There is no RPS supply connected.
LED Color Indicates