NonStop System Glossary

IPC
See interprocessor communications (IPC).
IPSec
Internet protocol security.
IPU
See instruction processing unit (IPU) or logical processor.
ISI
Interslice interrupt.
ISO
International Organization for Standardization. ISO is an international body that drafts, discusses,
proposes, and specifies standards for network protocols. ISO is best known for its seven-layer
reference model that describes the conceptual organization of protocols.
ISO is sometimes called the International Standards Organization. Although ISO is the official
abbreviation, it does not correspond to the organization’s name in any language.
ISO 646
An ISO standard for representing characters in languages based on the Roman alphabet. Like
ASCII, ISO 646 uses only 7 bits of each 8-bit byte to represent data. Contrast with ISO 8859.
ISO 8859
A series of ISO standard 8-bit code sets used to represent languages based on many alphabets,
including Roman, Greek, Cyrillic, Hebrew, Turkish, and Arabic. The ISO 8859 code sets are used
in international applications that must be data transparent. ASCII is a subset of each of the ISO
8859 code sets.
ISO 10646
A universal coded character set that represents all characters and symbols from all commonly used
scripts and languages.
ISO/IEC-conforming POSIX.1 application
An application that both:
• Uses only the facilities described in ISO/IEC IS 9945-1:1990 and approved conforming
language bindings for any ISO or IEC standard
• Is documented as using only those facilities and approved conforming language bindings
isolated ground
A grounding conductor that directly connects the equipment ground through an isolated ground-type
receptacle with the power system grounding point without any intermediate grounding points.
isolation transformer
A transformer containing electrostatic shields between the primary and secondary windings, with
no direct electrical path between the primary and secondary windings.
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