Allied Telesis AT-8550 - Manual (Page 14)

Summary of Features
1-6
Table 1-3 describes the LED indications on the AT-8518.
Table 1-3 AT-8518 LED
LED Color Indicates
Power Green
Yellow
The switch is powered up.
The switch is indicating a power, overheat, or fan failure.
DIAG Green
flashing:
Slow
Medium
Fast
Yellow
Power On Self Test (POST) in progress.
The switch is operating normally.
Software download in progress.
The switch has failed its POST.
10/100Mbps Port Status LEDs
Green
Yellow
Green
flashing
Off
Link is present; port is enabled.
Frames are being transmitted/received on this port.
Link is present; port is disabled.
Link is not present.
Gigabit Ethernet Port Status LEDs
Packet Yellow
Off
Frames are being transmitted/received on this port.
No activity on this port.
Status Green on
Green
flashing
Off
Link is present; port is enabled; full-duplex operation.
Link is present; port is disabled.
Link is not present.