OSI/FTAM Configuration and Management Manual

Glossary
OSI/FTAM Configuration and Management Manual—421944-001
Glossary-8
subdevice
subdevice. A logical entity providing access to a physical entity (a communications line).
There may be one or many subdevices associated with a given line or process. Exactly
what constitutes a subdevice differs depending on the subsystem. A ViewPoint
subdevice corresponds to an X.25 network
virtual circuit. Tandem LAN Access Method
(TLAM) subdevices are of several types: FSAPs, ports, services, domains, workstations,
windows, and gateways [for G06 and later releases, Port Access Method (PAM)
subdevices correspond to PAM ports].
subnetwork. One or more intermediate systems that provide relaying and through which end
systems may establish network connections.
subsystem. In Distributed Systems Management (DSM)
, a program or set of processes that
manages a cohesive set of objects. Each subsystem has a process through which
applications can request services by issuing commands defined by that subsystem; in
some cases, this process is the entire subsystem. Many subsystems also have an
interactive interface.
Subsystem Control Facility (SCF). A Distributed Systems Management (DSM)
facility that
allows system managers to make online changes to the configuration of devices and
controllers. DSM is used to provide a common, interactive management interface for
configuring, controlling, and collecting information from Tandem data communications
products.
Subsystem Control Point (SCP). In Distributed Systems Management (DSM)
, the
management process for all Tandem data communications subsystems. Applications
using the Subsystem Programmatic Interface (SPI) send all commands for data
communications subsystems to an instance of this process, which in turn sends the
commands on to the manager processes of the target subsystems. SCP also processes a
few commands itself. It provides security features, version compatibility, support for
tracing, and support for applications implemented as NonStop process pairs.
subsystem ID (SSID). In Distributed Systems Management (DSM)
programmatic interfaces,
a data structure that uniquely identifies a subsystem to the Subsystem Programmatic
Interface (SPI). It consists of the name of the owner of the subsystem (such as Tandem),
a subsystem number that identifies that particular subsystem, and a subsystem version
number. The SSID is an argument to most of the subsystem
procedures.
Subsystem Programmatic Interface (SPI). In Distributed Systems Management (DSM)
, a
set of procedures and associated definition files used to define common message-based
programmatic interfaces for communication between requesters and servers—for
instance, in a management application.
summary state. In Distributed Systems Management (DSM)
interfaces to Tandem data
communications subsystems, a summary state is one of the generally-defined possible
conditions of an object, with respect to the management of that object. Examples of
summary states are STARTED, STOPPED, SUSPENDED, and ABORTING.