3Com 3CR17251-91 - Switch 5500G-EI Stackable Gigabit Ethernet Getting Started Manual - page 21
Switch 5500 Family — Front View Detail
21
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.
1000BASE-X SFP Port LEDs
Speed
Green
A 1000 Mbps link is present.
Yellow flashing
The port has failed post.
Off
No link is present.
Duplex
Green
Full duplex packets are being transmitted/received on
the port.
Yellow
Half duplex packets are being transmitted/received on
the port.
Yellow flashing
Port failed POST.
Off
No links is present.
100BASE-X SFP Port LEDs
Speed
Green
A 100 Mbps link is present.
Yellow flashing
The port has failed post.
Off
No link is present.
Duplex
Green
Full duplex packets are being transmitted/received on
the port.
Yellow
Half duplex packets are being transmitted/received on
the port.
Yellow flashing
Port failed POST.
Off
No links is present.
LED
Color
Indicates