SWAN Concentrator and WAN Subsystem Troubleshooting Guide

Glossary
SWAN Concentrator and WAN Subsystem Troubleshooting Guide—426992-008
Glossary-8
Open Systems Interconnection (OSI)
Open Systems Interconnection (OSI). A basic reference model, developed by the
International Standards Organization (ISO), to define the standard architecture of
interconnecting computers and operating processes. The model consists of seven
layers, each of which contains a logical grouping of functions that provide specific
services for facilitating communication.
Open Systems Interconnection (OSI) Layer 2. The data-link control level of the OSI
Reference 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 data access method, link relationship of
stations, error-detection scheme, error-recovery, message formatting, logical half-
duplex or full-duplex operation, and code and machine transparency. See also Open
Systems Interconnection (OSI).
operating system. An organized collection of software that controls the basic operations of
a computer, such as the NonStop Kernel operating system.
OSI. See Open Systems Interconnection (OSI).
OSM. HP Open System Management (OSM) Interface. Replaces TSM as the system
management tool of choice for NonStop S-series servers. Provides the same
functionality as TSM while overcoming limitations of TSM. OSM is required for support
of the new functionality in G06.21 and later.
path. There are two Ethernet ports (port A and port B) on each SWAN concentrator. During
software configuration, the DEVICE object is configured with a preference for either
path A or path B. These paths correspond to the A and B Ethernet ports. The preferred
path is designated as the primary path for accessing the SWAN concentrator and is
used to establish the WAN LINE unless there is some sort of failure, in which case the
alternate path is used.
PATH object. A configurable object within the WAN subsystem SCF interface that defines
an Ethernet path on a SWAN concentrator CLIP. Two PATH objects can be defined on
each CLIP. Adding an Ethernet “PATH A” defines an IP address that will be
downloaded to the SCC1 Ethernet port interface. Adding an Ethernet “PATH B” defines
an IP address that will be downloaded to the SCC2 Ethernet port interface.
physical link interfaces. Physical link interfaces are described in documents produced by
standards organizations. The following definitions are supported for the SWAN
concentrator: RS-232, RS-449, RS-442, V.35, and X.21.
pNA+. Part of the pSOS system product provided by Integrated Systems, Inc. It provides
support for the TCP/IP layers and the Ethernet interface on each communications line
interface processor (CLIP) on the SWAN concentrator.
port. See WAN port.
power supply. A unit that converts standard line voltage into the voltages needed by the
computer components.