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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
5-35
5.9.3 REMOTE SYSTEM ALERT SUPPORT
These systems provide Remote System Alert (RSA) support for such NIC cards as the 3Com
3C905C-TX NIC card. The RSA function is similar to AOL in that the unit provides, even while
powered off, system status alert messages to a network console. However, NIC cards implementing
the RSA method do not use the SMBus for receiving alert information and therefore require, in
addition to the PCI connection, an auxiliary AOL/SOS cable connection with the system board
(Figure 5-13).
Figure 5-13. Remote Sense Alert Implementation (Generic Representation)
In the Remote Sense Alert implementation, a NIC card receives event notification directly from the
system’s thermal sensors and the LPC47B357 I/O controller over an AOL/SOS cable connection
(Figure 5-14). During system-off conditions the NIC card receives auxiliary power from the 3.3
VDC auxiliary power rail on the PCI bus.
Figure 5-14. RSA Logic, Block Diagram
NIC Card in PCI Slot
System Board
AOL/SOS Cable
Network
Cable
AOL/SOS
Header P12
System Board NIC Card
PCI
Connector
Thermal
ASIC
PCI
Bus
PCI
Bus
7
BIOS Fail
OS Fail
Intrusion
Thermal
Fan Alert
Pwr Alert
47B357
I/O Cntlr.
NC
NC
AOL/SOS
Header
1
SOS
NC
NC