SNAX/XF LU Network Services Manual

Glossary
Glossary–8 097841 Tandem Computers Incorporated
subarea. In SNA, a portion of the SNA network consisting of a subarea node and its
associated resources. Within a subarea node, all network addressable units and
adjacent link stations that are addressable share a common subarea address and have
distinct element addresses.
subarea node. A node containing an SSCP or an NCP. A node type 5 and a node type 4
physical unit are subarea nodes.
subarea node process (SNP). An internal SNAX/XF nonprivileged, major process that
the user can run. The SNP provides the equivalent cross-domain support of an SNA
SSCP in addition to the path control functions required of an adjacent subarea node.
The SNP provides the functions of all the SNA layers except the Data Link Control
layer.
subsystem. A process or collection of processes that give users access to a set of related
resources or services. A subsystem typically controls a cohesive set of objects.
Subsystem Control Facility (SCF). A Tandem interface product that allows users to
configure, control, and examine the status and configuration of selected Tandem data
communications subsystems.
Subsystem Control Point (SCP). A process that receives and redistributes Subsystem
Programmatic Interface messages to targeted data communications subsystems.
Subsystem Programmatic Interface (SPI). Part of the DSM family of software products. A
standard set of programmatic message formats and protocols that can be used to
exchange event information and commands between various subsystems and user-
written or Tandem-written processes.
SUT. See site update tape.
SVC. Switched virtual circuit.
system generation (SYSGEN). Tandem’s system generation program that allows a system
operator to tailor the operating system to the requirements of an installation for a
specific hardware and software configuration. The SYSGEN process can be divided
into three phases: configuring the system, generating the operating system, and
installing the operating system.
system services control point (SSCP). The focal point within an SNA subarea network for
managing the configuration, coordinating network-operator and problem-
determination requests, and providing directory support and other session services for
end users of the network. Multiple SSCPs, cooperating as peers, can divide the
network into domains of control, with each SSCP having a hierarchical control
relationship to the physical units (PUs) and logical units (LUs) within its domain.
SYSGEN. See system generation.
TACL. See Tandem Advanced Command Language.
Tandem Advanced Command Language (TACL). A Tandem product that provides the user
interface to the operating system. The ITI protocol is used by the Tandem command
interpreter TACL.