X25AM Configuration and Management Manual

Glossary
X25AM Configuration and Management Manual—523424-004
Glossary-9
SCF
SCF. Subsystem Control Facility. A subsystem used for issuing configuration and
information requests between the user and some communications subsystems.
secondary station. In an SDLC or ADCCP-NRM configuration, the station that is contacted
by the primary station and is controlled by the primary message in a message
exchange. The secondary station cannot initiate a communication. This type of
configuration is not used for X.25 connections. However, the combined station used for
X.25 connections is logically divided into a primary substation and a secondary
substation. See also primary station.
ServerNet wide area network (SWAN) concentrator. (1) An HP data communications
peripheral that provides connectivity to an Integrity NonStop NS-series or
NonStop S-series server. The SWAN concentrator supports both synchronous and
asynchronous data over RS-232, RS-449, X.21, and V.35 electrical and physical
interfaces. (2) A collective term for both SWAN concentrators and SWAN 2
concentrators when a distinction between the two is not required.
site update tape (SUT). One or more tapes that contain each target system’s site-specific
subvolume and various products. Each product contains a softdoc and a complete set
of files. A SUT is delivered with every new Integrity NonStop NS-series or
NonStop S-series system and can be ordered whenever a new release version update
(RVU) of the system software is available. A full SUT contains the current RVU of the
HP NonStop Kernel operating system and all product software that has been ordered
with it. A partial SUT contains a subset of products for the current software RVU.
SU. Name of an object used by SCF to refer to a subdevice.
subdevice. Logical component of X25AM that provides access to a circuit.
subscriber access link. Communications link between the local device or system and the
network.
Subsystem Control Facility. See SCF
.
SUT. See site update tape (SUT)
.
SWAN concentrator. See ServerNet wide area network (SWAN) concentrator.
SYSGEN. For systems running D-series RVUs, SYSGEN is the program that generates a
system-image file. The SYSGEN program is usually invoked by Install.
SYSnn subvolume. A subvolume on the $SYSTEM volume where the new version of the
operating system image is located. Also located on the SYSnn subvolume is
system-dependent and RVU dependent software. nn is an octal number in the range
%00 through %77.
switched line. Line configuration for circuit-switched networks such as a public telephone
network. The physical configuration may vary for each usage as a message is routed
through switching stations.