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Technical Reference Guide
Compaq Deskpro EXS and Workstation 300 Personal Computers
Featuring the Intel Pentium 4 Processor
First Edition - December 2000
5-33
5.9 NETWORK SUPPORT
These systems include specific features to support network interface PCI cards that may be
installed. These features, including network-alert functions with system-off support, are described
in the following subsections.
5.9.1 PCI VER. 2.2 SUPPORT
These systems support the Power Management Event (PME-) signal and provided 3.3 VDC
auxiliary power for all PCI slots. Network interface cards compliant with PCI specification ver. 2.2
may be installed to providE “system off” network support without additional cable connections. In
a powered-down state the compliant network card receives 3.3 volts of auxiliary DC power on pin
A14 of the PCI connector and uses PCI pin A19 for the PME- signal that is routed to general
purpose input #13 of the LPC47B357 I/O controller. Network activity causing the NIC card to
assert the PME- signal can be used to restart or “wake” the system from a suspend state.
NOTE: For auxiliary power to be available in a system-off condition the system unit
must be plugged into a live AC outlet. Controlling unit power through a switchable power
strip will, with the strip turned off, disable PME- functionality.
5.9.2 ALERT-ON-LAN SUPPORT
Alert-On-LAN (AOL) support allows a compliant network interface controller (NIC) card to
communicate the occurrence of certain events over a network even while the system unit is
powered off. In a system-off (powered down) condition a NIC card receives auxiliary +3.3 VDC
power (derived from the +5 VDC auxiliary power from the power supply assembly). Certain
events will result in a compliant NIC card to transmit an appropriate pre-constructed message over
the network to a system management console.
Reportable AOL events are listed in the following table:
Table 5–24. AOL Events
Table 5-24.
AOL Events
Event Description
BIOS Failure System fails to boot successfully.
OS Problem System fails to load operating system after POST.
Missing/Faulty Processor Processor fails to fetch first instruction.
Heartbeat Indication of system’s network presence (sent approximately every 30
seconds in normal operation).