IBM xSeries 445 Type 8870 Option Installation Manual page 91

LAN connection or TELNET session. The Ethernet port LEDs on the
Remote Supervisor Adapter indicate the link is good and activity is taking
place on the network.
Management port
Connect a serial cable to this port to enable system management through a
modem, or connect a null modem cable to enable system management
through a workstation or laptop computer.
Power LEDs
The green power LED indicates the status of the power connection.
Chapter 3. I/O connectors and LEDs
79