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Chapter 5 Input/Output Interfaces
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 5-14).
Network
Cable
System Board
Figure 5-14. 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 5-15). During system-off conditions the NIC card receives auxiliary power from the 3.3
VDC auxiliary power rail on the PCI bus.
Figure 5-15. RSA Logic, Block Diagram
5-32 Compaq Deskpro EX Series of Personal Computers
NIC Card in PCI Slot
System Board
BIOS Fail
47B357
OS Fail
I/O Cntlr.
NC
Intrusion
NC
Fan Alert
NC
Pwr Alert
NC
Processor
Thermal
PCI
Bus
First Edition – August 2000
AOL/SOS Cable
Optional NIC Card
AOL/SOS
Header
SOS
1
7
PCI
Connector
PCI
Bus
AOL/SOS
Header P12
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