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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 A
will disable wake-up event functionality.
C power strip to control system unit power
The wake up sequence for each event occurs as follows:
ake-On-LAN W
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.
efer to Chapter 5, “Network Support” for more information.
odem Ring
etected by the power
ontrol logic and, if so configured, cause the PS On signal to be asserted.
ower Management Event
ause
he PS On. Note that the PCI card must be PCI ver. 2.2
compliant to support this function.
R
M
A ring condition on serial port A (COM1) or serial port B (COM2) can be d
c
P
A power management event that asserts the PME- signal on the PCI bus can be enabled to c
the power control logic to generate t
Compaq Evo and Workstation Personal Computers
Featuring the Intel Pentium 4 Processor
Second Edition- January 2003
6-4