6760 ServerNet/DA Manual

Glossary
6760 ServerNet/DA Manual—424879-003
Glossary-67
portable application
portable application. An application that can execute on a wide range of hardware
systems from multiple manufacturers. A portable application is a program that can be
moved with little or no change in its source code from another manufacturer’s system
to an HP NonStop™ system.
portable filename character set. The set of characters that includes the Roman uppercase
and lowercase letters, the Arabic numerals, the period, the underscore, and the
hyphen. The hyphen cannot be the first character of a portable filename.
portable pathname character set. The set of characters that includes the Roman
uppercase and lowercase letters, the Arabic numerals, the period, the underscore, the
slash (
/), and the hyphen. The hyphen cannot be the first character of a portable
pathname.
Portable Silicon Operating System (pSOS) system product. A product of Integrated
Systems Inc. that provides support for industry-standard communications protocols
based on the UNIX operating system. It is used as a compact multitasking kernel
operating system for PowerPCs and similar systems.
position ID. A character that indicates the position an HP NonStop™ Cluster Switch
occupies in a network topology. The position ID is a component of the two-character
cluster switch name. The cluster switch name includes an external fabric ID (X or Y) as
the first character and a position ID as the second character. For example, the cluster
switch name X3 indicates that the cluster switch serves the external ServerNet X fabric
and occupies position 3 in the topology. Supported values for position IDs are 1
through 9 or A through Z. Currently supported topologies (star, split-star, and tri-star)
use position IDs 1, 2, and 3.
POSIX. The Portable Operating System Interface, as defined by the Institute of Electrical
and Electronics Engineers (IEEE) and the American National Standards Institute
(ANSI). Each POSIX interface is separately defined in a numbered ANSI/IEEE
standard or draft standard. The application program interface (API), known as
POSIX.1, has become ISO/IEC IS 9945-1:1990.
power distribution panel (PDP). A group of panel assemblies that composes a single
panel that includes buses and overcurrent protection devices (with or without
switches). A PDP is used for the control of power circuits.
power distribution unit (PDU). See computer-room power center (CRPC).
power domain. A set of customer-replaceable units (CRUs) and field-replaceable units
(FRUs) that share a set of power rails. For Telco Central Office (CO) systems, the
power domain is the entire system.
power factor. The ratio of real power to apparent power (that is, kilowatts/kilovoltamperes).
The power factor for a sinusoidal load is determined by the position of the applied
voltage waveform with respect to the current drawn by the load. When voltage and
current are in phase with each other, the power factor is unity and the power for the
load is equal to the product of the applied voltage and load current (P=EI). When the