Compaq W4000 manual Power LED Indications, Wake Up Events, Power LED Condition

Chapter 6 Power and Signal Distribution

6.2.2.2 Power LED Indications

A dual-color LED located on the front panel (bezel) is used to indicate system power status. The front panel (bezel) power LED provides a visual indication of key system conditions listed as follows:

Power LED	Condition
Steady green	Normal full-on operation
Blinks green @ 1 Hz	Suspend state (S1)
Blinks green @ 2 Hz	Sleep (suspend to RAM) state (S3)
Blinks green @ 4 Hz	Sleep (suspend to disk) state (S4)
Steady red	Processor not seated
Blinks red @ 0.5 Hz	Power supply crowbar activated
Blinks red @ 1 Hz	BIOS ROM error
Blinks red @ 4 Hz	Thermal condition: processor has overheated and shut down

6.2.2.3 Wake Up Events

The PS On signal can be activated with a power “wake-up” of the system due to the occurrence of a magic packet, serial port ring, or PCI power management (PME) event. These events can be individually enabled through the Setup utility to wake up the system from a sleep (low power) state.

NOTE: Wake-up functionality requires that certain circuits receive auxiliary power while the system is turned off. The system unit must be plugged into a live AC outlet for wake up events to function. Using an AC power strip to control system unit power will disable wake-up event functionality.

The wake up sequence for each event occurs as follows:

Wake-On-LAN

The network interface controller (NIC) can be configured for detection of a “Magic Packet” and wake the system up from sleep mode through the assertion of the PME- signal on the PCI bus. Refer to Chapter 5, “Network Support” for more information.

Modem Ring

A ring condition on serial port A (COM1) or serial port B (COM2) can be detected by the power control logic and, if so configured, cause the PS On signal to be asserted.

Power Management Event

A power management event that asserts the PME- signal on the PCI bus can be enabled to cause the power control logic to generate the PS On. Note that the PCI card must be PCI ver. 2.2 compliant to support this function.

6-4Compaq Evo and Workstation Personal Computers

Featuring the Intel Pentium 4 Processor

Second Edition- January 2003