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Open Firmware: An architecture for the firmware
that controls a computer before the Operating
System execution. It also provides a user-interface.
Operator Panel: The system panel where the
3-Digit Hexadecimal Display, two LEDs and the
Reset button are located.
Operating System: The software which manages
the computer's resources and provides the
operating environment for application programs.
P
PCI: Peripheral Component Interconnect. A bus
architecture that supports high-performance
peripherals such as graphic boards, multimedia
video cards and high-speed network adapters.
PDU: Power Distribution Unit. The rack power
distribution system for the installed drawers.
PowerPC: A standard RISC microprocessor
family.
Power Supply: The CPU drawer and the PCI
expansion drawer are equipped with one power
supply module. See Redundant Power Supply.
PPI: Parallel Port Interface.
Q
No entries.
R
rack: The metallic frame which houses the drawers
and provides them power through its Power
Distribution Unit (PDU).
RAID: Redundant Array of Inexpensive Disks. A
method of combining hard disk drives into one
logical storage unit which offers disk-fault tolerance.
RAM: Random Access Memory.
Redundant Power Supply: The power supply
composed by two modules in redundant
configuration. They are the same and work in
parallel. In case of a power supply fault, the second
module takes over automatically providing the
needed power.
riser (SRC): A card which can host up to six
memory DIMM's. It is used to expand the system
memory capacity.
RMS: Recovery Management Support.
ROM: Read Only Memory.
RS-232: An EIA interface standard that defines the
physical, electronic and functional characteristics of
an interface line.
RS-422: An EIA interface standard that defines the
physical, electronic and functional characteristics of
an interface line.
RS-485: A line for drawer interconnection. It is
used for the connection of expansion drawers.
RSF: Remote Services Facilities.
S
SCSI: Small Computer System Interface. An input
and output bus that provides a standard interface
used to connect peripherals such as disks or tape
drives in a daisy chain.
SID: System Identifier.
slot cover: A metallic plate that covers free
PCI/ISA controller card slots.
SRC: Six-DIMM Riser Card.
Stand-By menu: A menu which is available on the
terminal connected to the COM1 port when the
system is in standby state. It is used for system
maintenance and testing activities.
SYSID: System Identification.
system console: A console, usually equipped with
a keyboard and display screen, that is used by an
operator to control and communicate with a
system.
system planar (KPL): The planar which
interconnects all the system resources.
SVGA: Super Video Graphics Array.
T
torx: A special screw with a six-point starlike
hollow.
U
U: Unit. Racks and drawers are measured in Units.
Each U corresponds to 44.45 mm (1.75 inches).
ULTRA SCSI: See Fast-20 WIDE-16.
UPS: Uninterruptible Power Supply. A device which
provides continuous power and sustains the
system it is connected to, in case of outages.
G-3
Glossary
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