IBM 86884RX Installation Guide - Page 40

4. For the fourth level of diagnostics, LEDs on major system components indicate the component causing the error. As the processor-board assembly is not visible during normal operation, a light path diagnostics button has been incorporated into it to assist with diagnosing errors. You can light up the LEDs for a maximum of 2 minutes. After that time, the circuit that powers the lights is exhausted. The pop-out panel (Figure 1-14 on page 25) also has a remind button. This places the front panel system-error LED into remind mode, which means it flashes briefly every 2 seconds. By pressing the button, you acknowledge the failure but indicate that you will not take immediate action. If a new failure occurs, the system-error LED will turn on again and no longer blink. The system-error LED remains in the remind mode until one of the following situations occurs: All known problems are resolved The system is restarted A new problem occurs, at which time it then is illuminated continuously Tip: The remind button on the pop-out LPD panel does not function when AC power has been removed from the system. The button is just used to acknowledge a system error as described above. 1.11 Remote Supervisor Adapter The x450 includes a Remote Supervisor Adapter (RSA), which is positioned horizontally in a dedicated PCI slot beneath the PCI-X adapter area of the system. Rear of x450 External power supply ASM interconnect 10/100 (RS-485) port Ethernet port Error LED Power LED (amber) (green) Management COM port Figure 1-15 Remote Supervisor Adapter connectors 26 IBM ^ xSeries 450 Planning and Installation Guide