System Power-On MethodsThis section discusses the following system power-on methods:v Power-on switchv Remote power-on by ring-indicate signalThe server automatically powers on when it detects a ″ring indicate″ signal from amodem attached to one of the integrated serial ports.A remote user can call the server to activate ring detection by the modem. Listen fora few more rings than the threshold number for starting the system and then hangup. The default threshold is six rings.Wait 5 minutes for the server to initialize and then call again using an ASCII terminal.The server responds by requesting a password, if set, or presenting the serviceprocessor menus. The remote user now has control of the server.Note: For security, if the system is powered on by the remote power-on by ringindicate signal and the service processor detects a battery failure, the serviceprocessor causes the system to power off. See “Service Processor Call-InSecurity” on page 207 for more information.v Unattended start mode - refer to Enable/Disable Unattended Start Mode on page192.The service processor can be enabled to recover from the loss of ac power (seeEnable/Disable Unattended Power-On Mode in the “System Power Control Menu” onpage 192). When ac power is restored, the system returns to the power state at thetime ac loss occurred. For example, if the system was powered-on when ac lossoccurred, it reboots/restarts when power is restored. If the system was powered-offwhen ac loss occurred, it remains off when power is restored.v Timed power-on - refer to the shutdown -t command on servers using AIX.Working in conjunction with AIX, the service processor in your server can operate atimer, much like the wake-up timer on your clock radio. You can set the timer so thatyour server powers on at a certain time after shutting down. The timer is batteryoperated, so power interruptions occurring while the server is off do not affect itsaccuracy. Refer to the AIX shutdown -t command for details on setting the timer.Note: If an ac power loss is in progress when the timed power-on attempt occurs,the server cannot power on when ac power is restored.v Follow-up to a failed boot attemptThe service processor initiates a power-on sequence if a failed boot attempt isdetected (due to a hardware or software failure).v Fast/Slow Boot (IPL) CapabilitiesUsing the service processor menus, you can select the IPL type, mode, and speed ofyour system. For more information, refer to “System Power Control Menu” onpage 192.Attention: Selecting fast IPL results in several diagnostic tests being skipped, and ashorter memory test being run.206 Service Guide
