Fast Ethernet Adapter Installation and Support Guide

Glossary
Fast Ethernet Adapter Installation and Support Guide—425685-003
Glossary-65
Open Systems Interconnection Layer 2
Open Systems Interconnection Layer 2. The data-link control level of the Open Systems
Interconnection (OSI) model, composed of asynchronous or minimal line control
protocols, byte-oriented or character-oriented protocols, and bit-synchronous or
bit-oriented protocols. Data link protocols can be defined in terms of method of access
of data, link relationship of stations, error detection scheme, error recovery, message
formatting, logical half-duplex or full-duplex operation, code, and machine
transparency.
operating system image. See OSIMAGE.
operational environment. The conditions under which your system performs. These
include the devices and communications lines that are made active and the system
and application processes that are started at system startup.
operator. (1) A symbol—such as an arithmetic or conditional operator—that performs a
specific operation on operands. (2) In Network Control Language (NCL), a lexical
element used for working on terms in expressions. There are five types of operators:
parenthetical, arithmetic, Boolean, relational, and string. (3) For an HP NonStop™
system, the person or program responsible for day-to-day monitoring and maintenance
tasks associated with the HP NonStop Kernel operating system and the hardware of a
NonStop node. The operator issues commands to subsystems; retrieves, examines,
and responds to event messages; or does any combination of those things. See also
local operator. Contrast with administrator. (4) For a UNIX system, any interactive user
of that system.
operator message. A message, intended for an operator, that describes a significant event
on an HP NonStop™ S-series system. An operator message is the displayed-text form
of an Event Management Service (EMS) event message.
optical disk cartridge. A container that protects an optical disk platter from damage and
allows easy handling. Each cartridge contains two optical disk volumes.
optical disk drive. An optical storage library component that holds optical disk cartridges
during read and write operations.
Optical Disk Process (ODP). The software I/O process that controls an optical storage
library (OSL) and its optical disk volumes.
optical disk volume. One side of an optical disk cartridge.
optical storage library (OSL). A storage device consisting of an optical disk cabinet,
optical disk drives, multiple storage cells for optical disk cartridges, a robot that
automatically loads the cartridges into and unloads them from the drives, and a
cartridge access port (CAP) where an operator can load cartridges into or remove
cartridges from the OSL.
option. In a UNIX or Open System Services (OSS) command, a flag and its parameters or
a flag without parameters.