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Glossary–38 edge switch 2/16 service manual
Glossary
Open Systems Architecture
OSI. A model that represents a network as a hierarchical structure of functional layers. Each
layer provides a set of functions that can be accessed and used by the layer above. Layers are
independent, in that implementation of a layer can be changed without affecting other layers
(D).
open systems management server
OSMS. An optional feature that can be enabled on the director or switch through the Product
Manager application. When enabled, host control and management of the director or switch
are provided through an Open System Interconnection (OSI) device attached to a director or
switch port.
open systems mode
The mode that is used for Hewlett Packard or open fabrics. See also operating mode; S/390
mode.
operating mode
In directors or switches, in managed products, a selection between s/390 and open systems
mode. See also open systems mode; S/390 mode.
operating system
OS. Software that controls execution of applications and provides services such as resource
allocation, scheduling, I/O control, and data management. Most operating systems are
predominantly software, but partial hardware implementations are possible (D, T).
Operating System/390
OS/390™. An integrated, open-enterprise server operating system developed by IBM that
incorporates a leading-edge and open communications server, distributed data and file
services, parallel Sysplex™ support, object-oriented programming, distributed computing
environment, and open application interfaces (D).
optical cable
Single fiber, multiple fibers, or a fiber bundle in a structure built to meet optical, mechanical,
and environmental specifications (D, E). See also Jumper cable; trunk cable. Synonymous with
fiber-optic cable.
optical drive backup
A data backup system that uses rewriteable optical cartridges (ROCs) as the storage medium.
optical fiber connector
Synonymous with connector.