OSI/AS SCF Reference Manual

Glossary
OSI/AS SCF Reference Manual—424121-001
Glossary-9
subnetwork
subnetwork. One or more intermediate systems that provide relaying and through which end
open 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 Compaq data communications
products.
Subsystem Control Point (SCP). In Distributed Systems Management (DSM)
, the
management process for all Compaq 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 Compaq),
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 Compaq 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.
SYSGEN. The Compaq system generation program, used to configure objects such as
devices, controllers, and input/output processes (IOPs) in a newly installed system or to
update the system when new software is released. Objects to be configured are defined
to SYSGEN in a special configuration file, which can then be coldloaded into the
system. The Compaq Open Systems Interconnection (OSI)
products are not configured
with SYSGEN, but the underlying D-series X.25 Access Method (X25AM)
and Tandem
LAN Access Method (TLAM) IOPs are.
Tandem LAN Access Method (TLAM). For D4x series systems only. A Compaq product
that implements, for local area networks (LANs), the services of the Data Link Layer