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OCPRF100 MP Server System Technical Product Specification
Revision 1.0
113
10. Front Panel
This chapter describes the design and external interface of the OCPRF100 MP server system
front panel. The front panel provides a user interface to the OCPRF100 MP server system via
push buttons, indicator LEDs, an LCD panel, and a speaker. It also provides an interface to exter-
nal systems via the ICMB. All of the front panel functions are controlled by a Philips* 80C652
microcontroller. LEDs used to indicate individual fan failure and a dual speed fan converter that
controls the system fans are located on the front panel. System fan tachometer inputs are moni-
tored by the front panel.
Features
• Philips 80C652* microcontroller
• Power, reset, and NMI push buttons
• Fan speed control, monitoring, and individual fan fail indication
• Power-off and reset security
• Power, power fail, hard drive fail, and fan fail indicator LEDs
• LCD panel, which provides boot status and other information
• Concurrent ICMB and COM2 EMP interface
• Speaker
• Operation from standby power
• Full authority power management
10.1 Introduction
This section provides an overview of the OCPRF100 MP server system front panel. It also dis-
cusses the primary components and their relationships, and provides diagrams of the physical
board layout.
10.1.1 Board Overview
The OCPRF100 MP server system front panel provides a simple user interface to the
OCPRF100 MP server system. Push buttons on the front panel allow for power-up and reset as
well as NMI assertion. LEDs indicate when the system is powered on and when there has been a
power supply failure, hard drive failure, fan or other system cooling failure. The LCD panel pro-
vides information about the system, including boot status, available number of processors, and
other server management information.
The front panel also allows other systems to communicate with the server, even while power is
down, via an ICMB. The ICMB is an extension of the internal IPMB. Although the control circuitry
for ICMB is present on the front panel, the ICMB user interface connectors are located at the rear
of the chassis.