NonStop NS-Series Planning Guide (H06.03+)

Glossary
HP Integrity NonStop NS-Series Planning Guide—529567-004
Glossary-7
ohm
ohm. The standard unit for measuring resistance. A one-ohm resistor will conduct one
ampere when one volt is applied.
Online Support Center (OSC). The group of support specialists within the HP Global
Customer Support Center (GCSC) who respond to telephone calls regarding system
problems and diagnose malfunctioning systems using remote diagnostic links.
PDU. See power distribution unit (PDU).
peak load current. The maximum instantaneous load over a designated interval of time.
power distribution unit (PDU). An assembly of outlets and fuses that is installed on both
sides of a modular cabinet. This assembly provides power and over-current protection
for the components installed in the modular cabinet.
processor. (1) A functional unit of a computer that reads program instructions, moves data
between processor memory and the input/output controllers, and performs arithmetic
operations. Because a processor is composed of several hardware components that
reside in different enclosures, it is sometimes called a logical processor. A processor is
sometimes referred to as a central processing unit (CPU), but HP NonStop™ servers
have multiple cooperating processors rather than a single CPU. (2) One or more
computer chips, typically mounted on a logic board, that are designed to perform data
processing or to manage a particular aspect of computer operations.
processor complex. The set of one, two, or three processor slices and their associated
LSUs. For the first release of NonStop servers, a processor complex contains one to
four logical processors.
processor slice. See slice.
processor switch. A self-contained, rack-mountable enclosure that contains a ServerNet
switch board and supporting power, cooling, maintenance, and interfacing
components.
quality power. The attributes and configuration of the power-distribution systems installed
within a facility that best serve the power needs of that facility’s electrical equipment
(for example, computer systems, air conditioning, and so on), providing the minimum
possible disruption to equipment operation.
raceway. An enclosed channel used to hold wires, cables, or busbars. Most raceways have
removable tops to facilitate the installation or removal of their contents.
rack. A metal structure that has four columns, to which slides or rails that hold computer
equipment can be fastened.
radio frequency interference (RFI). Forms of conducted or radiated interference that might
appear in a facility as either normal or common-mode signals. The frequency of the
interference can range from the kilohertz to gigahertz range. However, the most
troublesome interference signals are usually found in the kilohertz to low megahertz