IBM 206 - Manual (Page 22)

Hard disk drive activity LED
When this LED is flashing, it indicates that a hard disk drive is in use.
Hot-swap hard disk drive activity LED (some models)
On hot-swap server models, each hot-swap drive has a hard disk drive
activity LED. When this green LED is flashing, it indicates that the drive is
in use.
Hot-swap hard disk drive status LED (some models)
On hot-swap server models, each hot-swap hard disk drive has a amber
status LED. If the amber status LED for a drive is lit continuously, it
indicates that the individual drive is faulty. The interpretation of a flashing
amber status LED depends on the SCSI controller connected to the
hot-swap drive, as follows:
When the drive is connected to an optional ServeRAID controller, a slowly
flashing (one flash per second) amber status LED indicates that the drive is
being rebuilt. When the LED is flashing rapidly (three flashes per second), it
indicates that the controller is identifying the drive.
Power-on LED
When this LED is lit and not flashing, it indicates that the server is turned
on. When this LED is flashing, it indicates that the server is off and still
connected to an ac power source (standby mode).
Power-control button
Press this button to turn the server on and off manually.
System-error LED
When this amber LED is lit, it indicates that a system error has occurred. A
LED on the system board might also be lit to help isolate the error. Detailed
troubleshooting information is in the Hardware Maintenance Manual and
Troubleshooting Guide on the IBM xSeries Documentation CD.
USB ports
Connect a USB device to these connectors.
Ethernet link status LED
This LED is on the Ethernet connector on the back of the server. When this
LED is lit, it indicates that there is an active connection on the Ethernet
port.
Ethernet transmit/receive activity LED
This LED is on the Ethernet connector. When this LED is lit, it indicates that
there is activity between the server and the network.
10 xSeries 206 Type 8482: User’s Guide