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1-14 System Overview
System Board Management Controller (BMC)
All server management functionality is concentrated in the System Board Management
Controller (BMC). The BMC and associated circuitry are powered from a 5Vdc standby
voltage, which remains active when system power is switched off, but the ac power
source is still on and connected.
One major function of the BMC is to autonomously monitor system management
events, and log their occurrence in the nonvolatile System Event Log (SEL). These
include events such as overtemperature and overvoltage conditions, Baseboard fan
failure, or chassis intrusion via the front door. To enable accurate monitoring, the BMC
maintains the nonvolatile Sensor Data Record (SDR), from which sensor information
can be retrieved. The BMC provides an ISA host interface to SDR sensor information,
so software running on the server can poll and retrieve the server's current status.
SEL contents can be retrieved after system failure, for analysis by field service
personnel using server management software tools such as Intel Server Control
available on the CD-ROM that ships with your system.
The BMC does the following:
Monitors server board temperature and voltage
Monitors processor presence and controls FRB
Detects and indicates baseboard fan failure
Manages the SEL interface
Monitors the system management watchdog timer
Monitors the periodic SMI timer
Manages front panel NMI handling
Monitors the event receiver
Manages the ISA host and IMB interface
Controls secure mode, including video blanking, floppy write-protect monitoring,
and front panel lock/unlock initiation
Manages the sensor event initialization agent
The BMC supports the Emergency Management Port (EMP) Console, which allows
remote server management via a modem or direct connection to a manager system.
Events monitored by the manager system include over-temperature and over-voltage
conditions, fan failure, or chassis intrusion.
Summary of Contents for NEAX Express
Page 1: ... S e r v i c e a n d R e f e r e n c e G u i d e NEAX Express ...
Page 2: ...NEC ...
Page 3: ... S e r v i c e a n d R e f e r e n c e G u i d e NEAX Express ...
Page 18: ...xvi Using This Guide NEC ...
Page 38: ...1 20 System Overview ...
Page 82: ...3 30 Configuring Your System ...
Page 136: ...4 54 Disassembly and Reassembly ...
Page 158: ...5 22 Problem Solving ...
Page 164: ...6 6 Illustrated Parts Breakdown ...
Page 165: ...A System Cabling System Cabling Before You Begin Static Precautions Standard Configuration ...
Page 170: ...A 6 System Cabling ...
Page 208: ...C 20 Emergency Management Port ...
Page 209: ...D Platform Event Paging ...
Page 224: ...E 14 Connectors ...
Page 234: ...10 Glossary ...
Page 241: ...xx ...
Page 242: ... 456 01510 000 ...