A
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ACF/NCP | | Advanced Communications Function for the Network
Control Program. An IBM program product that resides in the 37xx Communication
Controller and supports single and multiple domains.
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ACF/VTAM | | Advanced Communications Function for the Virtual
Telecommunication Access Method. An IBM program on the host that
provides single-domain SNA network capability, and optionally, multiple-domain
capability.
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B
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baud | | A measure of signaling speed equal to the number
of signal changes or events per second. Baud often refers to bits per
second.
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BIND | | A request to activate a session between two logical
units. A BIND is an SNA request sent by the host to SNA IMF. A BIND request
specifies the detailed protocol that SNA IMF accepts before initiating
an LU-LU session.
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blocked | | See wait I/O.
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C
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CICS | | Customer Information Control System. An IBM interactive
subsystem that acts as an interface between terminal users and a
host's application programs and databases. CICS also includes
facilities for building, using, and maintaining databases.
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cluster controller | | A programmable device that supports one or more
terminals or printers. A cluster controller communicates with the
host either through a local channel attachment or through a communications
controller, modems, and phone lines. The HP 3000 emulates
a cluster controller in an SNA network.
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communications controller | | A type of front-end processor, such as an IBM 3705,
3720, or 3725, that communicates between the communications facilities
and a host computer. IBM supports both programmable and non-programmable communication
controllers. Hewlett-Packard's INP and PSI are kinds of
communications controllers.
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compatibility mode | | A processing mode on HP 3000 Series 900 computers
that allows MPE V applications to run on MPE XL machines without changes
or recompilation.
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control unit (CU) | | A device that controls input and output for one or
more devices such as printers or display stations.
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D
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data stream mode | | See transparent mode.
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DBCS | | Double-Byte Character Set. A character set that
includes one- and two-byte characters, used by many Asian countries.
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E
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end user | | A person at a terminal, a device, or a program running
in a processor that interacts with the network to obtain a service
provided by the network. An end user is the source and destination
of application data flowing through the network.
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extra data segment (XDS | | An MPE V extra data segment, which SNA IMF/V uses
to maintain data structures related to the internal screen image,
half sessions, and message units in an LU-LU session.
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F
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FMD | | Function Management Data Services. A generic term
that describes both session presentation and session network services.
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H
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half session | | A component of an SNA network that provides FMD
services and data flow and transmission control for one of the sessions
of an NAU.
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HDLC | | High-level Data Link Control. A bit-oriented data
link protocol used in full-duplex communications. HDLC was developed
by the International Standards Organization
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host | | A central computer that provides services for other
computers and terminals attached to it.
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I
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IMF/3000 | | An HP Interactive Mainframe Facility product (like
SNA IMF) that runs only on MPE V. IMF/3000 supports both
BSC and SDLC protocols. It emulates a Node Type 1 in an SNA network
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IMS | | Information Management System (IMS). An IBM program
product that provides data communication interfaces between application
programs and terminals and between application programs and databases.
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INP | | Intelligent Network Processor. A hardware portion
of SNA Link/V that implements the Physical Control and Data Link
Control layers of SNA.
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internal screen image | | A data handling technique used by SNA IMF. When
using non-transparent mode, the internal screen image holds a character-by-character
image of an IBM 3278 screen. When using transparent mode, your application
program can obtain the untranslated data stream from the internal
screen image.
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intrinsic | | A subprogram provided by Hewlett-Packard to perform
common functions such as opening files, opening communication lines,
or sending and receiving data over a communication line.
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L
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link | | The physical or logical connection between two devices
in a network.
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Logical Unit (LU) | | A program or a set of programs within a node that
provides access to an SNA network for an end user. A Logical Unit
can support two types of sessions: LU-to-SSCP sessions and LU-LU
sessions.
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LU class | | Logical Unit class. A set of Logical Units on the
HP 3000. For SNA IMF, an LU class may contain multiple LUs. For
NRJE, each LU class may contain only one LU.
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LU-LU session | | A connection between two LUs.
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LU.T1 | | Logical Unit Type 1. A program or set of programs
within a node that provides communication between application programs
and data processing programs using interactive or batch data transfer.
Character oriented printer devices, batch support (RJE), and the
SNA Character String (SCS) are supported.
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LU.T2 | | Logical Unit Type 2. A program or set of programs
within a node that provides application program to 3270-type display
station communication using interactive data transfer. IBM 3270
data stream capability and 3270-type display station support is provided.
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LU.T3 | | Logical Unit Type 3. A program or set of programs
within a node that provides application program to printer communication.
IBM 3270 data stream capability is provided. Many devices support
both LU.T1 and LU.T3 print requests.
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M
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MPE V | | Multiprogramming Executive V. An operating system
for the Hewlett-Packard 3000 computer, Series 37 through 70. MPE
V consists of programs that handle exchanges between HP terminals,
printers, and executing programs and the internal HP 3000 Communications
Services.
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MPE XL | | Multiprogramming Executive XL. An operating system
for the Hewlett-Packard 3000 computer, Series 930 and 950. MPE XL
consists of programs that handle exchanges between HP terminals,
printers, and executing programs.
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MVS | | Multiple Virtual Storage. An IBM operating system
that is an extension of OS/MVT. MVS also is called OS/VS2 Release
2.
|
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MVT | | Multiprogramming with a Variable number of Tasks.
An IBM operating system that supports multiple programming with
a variable number of tasks on the System/360.
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N
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Native Language Support (NLS) | | An HP product that allows the HP 3000 to produce localized
application programs for end users without reprogramming for each
language or country.
|
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native mode | | The normal processing mode of the MPE XL operating
system. Native mode applications are those that have been compiled
in the native instruction set of the HP 3000 Series 900 computer.
|
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NAU | | Network Addressable Unit. Either a program or a
group of programs that represents the source and destination of
data in a network. The three kinds of network addressable units
are SSCP, LU, and PU.
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NCP | | See ACF/NCP.
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NLS | | See Native Language Support.
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NM capability | | Node Management capability. An MPE user capability
required for SNA IMF operator tasks. The node manager configures
an SNA service on the HP 3000.
|
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no-wait I/O | | A form of input/output handling in which the system
overlaps multiple I/O requests, overlaps I/O requests with CPU,
and responds to the completion of the first of several outstanding
I/O requests. With no-wait I/O, your program does not suspend and continues
processing while I/O completes. See wait I/O.
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node | | A basic component of an SNA network, which consists
of a set of hardware devices and associated software that are at
the end of a data link. Specifically, nodes within an SNA network
can be distributed or host processors, communications controllers,
cluster controllers, or terminals.
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Node Management Services (NMS) | | A set of utilities on the HP 3000 that
handles link and node level startup and shutdown, logging, tracing,
and diagnostic functions. On MPE V, NMS is part of the SNA Link/V
product. On MPE XL, NMS is part of the Fundamental Operating System.
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Node Type 1 | | A terminal or printer.
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Node Type 2 | | cluster controller, such as the IBM 3274.
|
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Node Type 4 | | A communications controller such as the IBM 3705,
3720, and 3725.
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Node Type 5 | | A host processor with a System Services Control
Point (SSCP).
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non-transparent mode | | A mode of SNA IMF operation in which the internal
screen image holds a character-by-character image of an IBM 3278
screen. This image is accessible by the SNA IMF intrinsics.
|
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NRJE | | Network Remote Job Entry. A Hewlett-Packard product
that uses IBM's SNA/SDLC protocol to emulate an IBM 8100
Distributed Processing Program RJE workstation. This emulation allows
users on the HP 3000 to submit batch jobs, through an SNA network,
to an IBM host or compatible mainframe for processing. The host
can then send the output back to the HP 3000 for printing
or storing on disk.
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P
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Pass Thru | | An SNA IMF application program that uses SNA IMF
intrinsics to allow certain HP terminals attached to an HP 3000
to emulate, with some differences, IBM 3278 display stations and
IBM 3287 printers connected to an IBM host.
|
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physical unit (PU) | | A set of SNA components that provide services that
manage and monitor the resources of a node. Each node, whether a
control unit, terminal, controller, or processor, contains one physical
unit.
|
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PM (privileged mode) capability | | MPE capability that allows programs to operate with no-wait
I/O. PM capability bypasses the normal checks and limitations that
apply to standard users.
|
---|
programmatic access mode | | A form of programmatic communication using SNA IMF that
allows programs on the HP 3000 to access host programs
such as CICS, IMS, and TSO through a set of high-level intrinsics.
To the host, the HP 3000 program using SNA IMF intrinsics
looks like either an IBM 3278 display station or an IBM 3287 printer.
|
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PSI | | Programmable Serial Interface. A hardware portion
of SNA/SDLC Link/XL and SNA/X.25 Link/XL that implements the Physical
Control and Data Link Control layers of SNA
|
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R
|
---|
Request Unit (RU) | | A message unit that contains control information
such as a request code or function management headers, end-user
data, or both.
|
---|
Response Unit (RU) | | A message unit that acknowledges a Request Unit.
If positive, the Response Unit may contain additional information
(such as session parameters in response to BIND SESSION), or if
negative, contains sense data defining the exception condition.
|
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S
|
---|
SCS | | See SNA Character String.
|
---|
SDLC | | Synchronous Data Link Control. A protocol for managing
synchronous, code-transparent, serial-by-bit information transfer
over a link connection. Transmission exchanges may be full-duplex
or half-duplex over switched or nonswitched links. The configuration
of the link connection may be point-to-point, multipoint, or loop.
|
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security video | | An SNA IMF feature that emulates the non-display
feature of an IBM 3278 display station. Security video allows you
to type data into a non-display field without having the data appear
on your screen.
|
---|
session | | A logical connection between Network Addressable
Units.
|
---|
Shift-in (SI) | | The control code with the hexadecimal value of "0F" that
is used in the data stream to signal the end of a sequence of Asian
(DBCS) characters.
|
---|
Shift-out (SO) | | The control code with the hexadecimal value of "0E" that
is used in the data stream to signal the beginning of a sequence
of Asian (DBCS) characters.
|
---|
SNA | | Systems Network Architecture. A comprehensive specification
for distributed data processing developed by IBM in 1974. SNA defines
rules, procedures, and a layered protocol for communication and
control within a network.
|
---|
SNA Character String (SCS) | | A character string composed of EBCDIC control characters,
optionally intermixed with end-user data, that is carried within
a Request Unit (RU).
|
---|
SNA IMF | | SNA Interactive Mainframe Facility. An HP product
that emulates a remote IBM 3274 Cluster Controller with attached
IBM 3278 display stations and IBM 3287 printers. SNA IMF provides
interactive communication between an HP 3000 and an IBM host
computer in an IBM SNA environment.
|
---|
SNA Link/V | | Bundled software and hardware that provides a logical
and physical connection between an HP 3000, with MPE V, and an SNA
network. SNA Link/V consists of the following: Node Management Services (NMS) — software SNA Transport — software INP and cable — hardware
|
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SNA NRJE | | See NRJE.
|
---|
SNA Service | | A Hewlett-Packard software product that provides
the user interface to an SNA network. An SNA Service implements
the upper three SNA layers; Data Flow Control, Function Management
Data Services, and NAU Services Manager. SNA IMF, SNA NRJE, and
LU 6.2 API are examples of SNA services.
|
---|
SNA Transport | | Software residing immediately below SNA IMF that
provides the functions of the Path Control and Transmission Control
layers and manages all the sessions with the host SSCP. SNA Transport
is part of the SNA link product.
|
---|
SNA/SDLC Link/XL | | Bundled software and hardware that provides a logical
and physical connection between an HP 3000, with MPE XL, and an
SNA network. SNA/SDLC Link/XL consists of the following: SNA Transport — software PSI and cable — hardware
|
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split order | | A condition that occurs when SCS control codes or
parameters span RU boundaries within an RU chain.
|
---|
SSCP | | Systems Services Control Point. A part of the SNA
host node that helps to manage configurations, does problem solving,
controls network operations, and provides other session services
for end users. An SSCP exists only in the host and is exercised
by the host's communications access method.
|
---|
standard MPE I/O | | See wait I/O.
|
---|
T
|
---|
Time Sharing Option (TSO) | | A mode of SNA IMF operation that allows your application program
to obtain the untranslated data stream when transferring data between
the host and the HP 3000.
|
---|
U
|
---|
unblocked I/O | | See no-wait I/O.
|
---|
V
|
---|
VM | | Virtual Machine. An operating system that allows
an IBM mainframe to run simultaneously several different operating
systems, including multiple copies of CMS. These different operating
systems run under VM.
|
---|
VTAM | | See ACF/VTAM.
|
---|
W
|
---|
wait I/O | | The standard method of handling input/output on
MPE systems. A process issuing an I/O request is suspended until
the I/O request completes. Unlike no-wait I/O, wait I/O does not
allow overlapping of I/O requests. See no-wait I/O.
|
---|
X
|
---|
XDS | | See extra data segment.
|
---|