SNAX/XF and SNAX/APN Configuration and Management Manual

Glossary
SNAX/XF and SNAX/APN Configuration and Management Manual—425836-005
Glossary-21
SPI
devices in a NonStop network and SNA hosts. SNAX/XF provides device control,
session passthrough, and application-to-application communication.
SPI. See Subsystem Programmatic Interface (SPI).
SSCP. See system services control point (SSCP).
SSCP-LU session. In SNA, a session between an SSCP and an LU that enables the LU to
request the SCCP to help initiate LU-LU sessions.
STARTED state. As defined by SCF or SPI, the state of an object that has been defined
and initialized.
STARTING state. As defined by SCF or SPI, the state of an object that is being initialized.
The STARTING state is a transition state between the STOPPED and the STARTED
states.
state. In Subsystem Control Facility (SCF) subsystems, one of the generally defined
possible conditions of an object with respect to the management of that object.
Examples of states are DEFINED, STARTED, and STOPPED.
static passthrough. A passthrough mode that allows SLUs connected to a NonStop system
to take the initiative in establishing sessions with host application programs. With static
passthrough, the host SSCP can send USS messages to devices connected to a
NonStop system.
STOPPED state. As defined by SCF or SPI, the state of an object that has been added to
the configuration by means of the ADD command, but is not currently initialized.
STOPPING state. As defined by SCF or SPI, the state of an object that has been defined
and started, but is being terminated by means of the STOP command.
SU object. An SCF object used in X25AM to represent a virtual circuit.
subarea. A portion of an SNA network consisting of a host or a communication controller
and its peripheral nodes.
subarea network. An SNA network implementing subarea networking by interconnecting
SNA subareas, their directly attached peripheral nodes, and the transmission groups
that connect them. Node type 5 controls the resources in the other node types. For
example, LU-LU sessions must be established through the SSCP. Contrast with
advanced peer-to-peer networking (APPN).
subordinate objects. In NonStop data communications subsystems, objects that are at the
next-lower level of the object hierarchy. Some subsystems structure their objects
hierarchically, with one object type logically subordinate to (that is, controlled by)
another object type. For example, a number of subdevices can be configured on a
single line and thus the subdevice object type could be subordinate to the line object
type.