Glossary
The following terms and phrases are intended to aid the reader
in the use of this manual and to clarify terminology as it is
utilized in this publication.
[Some definitions contained in this Glossary have been extracted
or based upon descriptions and entries in Common User Access
Panel Design and User Interaction, IBM publication SC26-4351.
]
- Access
- A Network Center Component designed to control which sessions are allowable
within a ACF/VTAM domain.
- ACF/VTAM
- The Advanced Communications Facility/Virtual Telecommunications
Access Method, IBM's System 390 implementation of SNA concepts.
- Alias
- A name that represents an element (terminal,
mode table entry, or class of service) in another network.
Commonly used to eliminate confusion between logical units that
have the same name in two different SNA networks.
- CMS
- The Conversational Monitor System, is the interactive portion
of IBM's Virtual Machine (VM) operating system.
- control vector
- Identifies a portion of a defined SNA structure or sub-structure
that contains information about an activity occurring within the
network.
- Cross domain
- Describes an action or activity that occurs between two or more
VTAM domains (E.G. a "cross domain" session is a session where
the PLU and SLU are owned by different copies of ACF/VTAM)
- Cross network
- Describes an action or activity that occurs between two or more
SNA networks (E.G. a "cross network" session is a session where
the PLU and SLU are owned by different SNA networks)
- CUA
- Common User Access, a portion of SAA (Systems Application
Architecture) that defines and describes the user interface to
the computing system.
- DLU
- Destination Logical Unit, is a SNA term used to identify
the receiving entity or LU in a session or transmission. See
also PLU.
- domain
- The resources (devices, subsystems, etc.) controlled by a single
copy of ACF/VTAM.
- Group
- A list of rule and/or ruleset names that will be considered to
be related to each other and identifiable by the group name.
- ISTEXCAA
- The name for the ACF/VTAM Session Management Exit.
- Network Data File
- The BSAM accessed disk storage used by The Network Center to keep information
across execution on an external storage device.
- NETID
- The eight character identifier that signifies the name of one
or more VTAM domains operating as an individual SNA network.
- Network Administrator
- The individual or individuals at your installation responsible for
the installation and operation of Timeout.
- OLU
- Originating Logical Unit, is a SNA term used to identify
the initiating entity or LU in a session or transmission. See
also SLU.
- pattern characters
- The asterisk "*" or percent sign "%" allow a masking
process to be utilized for comparing character strings.
- PLU
- Primary Logical Unit, is a SNA term used to identify one
"side" of a session. The PLU is typically an application
subsystem (the Network Center Server operates as a PLU to the Network Center Interface in TSO).
- Query
- A Network Center Component providing a series of panels for the display and
diagnosis of the internal operations of ACF/VTAM.
- rule
- A set of conditions that, when matched, indicates to Timeout
whether to approve or reject a specific session request.
- rule set
- A grouping of one or more rules.
- session
- The SNA term for the communications between two LUs (logical
units). E.G. A "session" exists between a
terminal device and a subsystem.
- SDT
- Session Directory Table, is the control block maintained by Timeout
within the Network Center Server and ACF/VTAM to indicate the session activity between
the SLU and PLU for a specific session.
- Session Management Exit
- The processing point within ACF/VTAM where sessions can be approved
or rejected under local installation control. This is the exit point
used by Timeout to enforce the rules.
- SLU
- Secondary Logical Unit, is a SNA term used to identify one
"side" of a session. The SLU is typically a terminal device,
but may also be a processing program (the Network Center Interface for TSO operates as
an SLU).
- Subarea
- A numeric value that uniquely identifies a hardware processing
unit within a VTAM domain. The Subarea value must be unique within
a single SNA network.
- SSCP
- System Services Control Point, the key processing point within a
ACF/VTAM domain that manages session initiation and termination.
- The Network Center
- The name of the NRS product family of ACF/VTAM utility functions.
Timeout is a Component of The Network Center.
- Timeout
- A Network Center Component providing a domain wide inactivity timer for idle
terminal sessions.
- TSO
- The Time Sharing Option, is the interactive portion
of IBM's Operating System (OS) operating system (commonly known
as MVS, MVS/SP, MVS/XA, or MVS/ESA).
- Value Group
- a collection of literal values that are referenced within
The Network Center's Rule processing as a single element. The first character
of a Value Group's name is always an ampersand.
- VSCS
- VM SNA Console Support, a VTAM application program that operates
in the VM environment providing an interface between SNA based devices
and the services of CP (VM's Control Program).