Glossary

American Standards Committee on Information Interchange. A standard used by computers for interpreting binary numbers as characters.

A form of data communications in which a facility collects data over a period of time and then submits collected information to a host computer. Typical batch communication consists of large amounts of information transmitted at infrequent intervals.

An SNA command sent by the host to NRJE. This command specifies the detailed protocol that NRJE accepts before initiating an LU-LU session.

A sequence of RUs constituting a recoverable entity.

A front-end processor which provides an interface between the communications facilities and a computer. IBM provides programmable and non-programmable communications controllers. An INP is a communications controller.

A logical device through which commands are transmitted to the host job entry system, and responses (messages generated by the host) are received by NRJE.

In IBM terminology, any file.

An IBM JCL command defining a data set.

An SNA Function Management header. These headers select destinations or sources for subsequent data transmission and supply information for other data management tasks.

A special form identifier for output data sets, which is used as a key into a Lookup Table of file equations. A formid is a string of eight characters or less. It is composed of alphanumeric characters, IBM National characters (#, $, or @), or a period (.). A formid reference, as in a SUBMIT command, must be delimited by single quote marks; for example, 'formid'.

In SNA, a component that provides FMD services, data flow control, and transmission control for one of the sessions of a network addressable unit (NAU).

A host system is a central computer which provides services for other computers and terminals attached to it.

An SNA request to the SSCP to initiate an LU-LU session.

A subprogram provided by Hewlett-Packard systems. These subprograms perform common functions such as opening files, opening communications lines, or transmitting data over a communications line.

A message returned from the host system acknowledging that a job submitted through NRJE is being received at the host. For JES2 hosts it is the $HASP100 "ON READER" message. For JES3 it is the IAT6101 message. VSE/POWER does not acknowledge job reception to remote sites.

IBM job control language. JCL is used to tell the operating system the names and locations of programs and the locations of data for those programs.

IBM job entry control language. JECL statements are used for job control under the VSE/POWER subsystem. These statements define a job to VSE/POWER and specify how job input and output are to be processed.

A common IBM job entry subsystem used under the MVS operating system.

A common IBM job entry subsystem used under the MVS operating system.

An IBM subsystem which provides a gateway for the execution of jobs in a batch environment; for example, JES2.

The ability to specify the final destination of output data sets at the time a job is submitted to NRJE to be transmitted. For NRJE, this capability is enabled by the PRINT, PUNCH, and FORMS options of the SUBMIT command.

A file to be transmitted to a host computer, to be executed as a job.

A logical device; a disk file, a set of disk files, or a physical device. An HP 3000 ldev is identified by a number or a device class name.

Logical device number. See ldev.

See ldev.

A logical printer receives line printer images from a host system.

A logical punch receives card punch images from a host system.

A logical reader transmits card punch images to a host system. (See Also Virtual reader)

See LU.

A logical writer is a logical printer or a logical punch.

A set of LUs on an HP 3000. NRJE/V will identify individual LUs only if they have separate class names.

An SNA logical unit. An LU is the SNA entity through which application data is transmitted within an SNA network. An LU provides access to an SNA network for an end user. It formats message units, displays information, and handles error recovery. Multiple LUs can reside in an SNA node.

A mainframe is a computer that generally has a large amount of memory and operates at a high speed.

Network addressable unit. The NAU represents the source and destination of data in a network. A communications session must exist before data can be transferred. Three types of NAUs exist: SSCPs, PUs, and LUs. Sessions are established by the SSCP,

Network control program. This program supports SNA communications on the IBM 3705 communications controller.

Node management. This is an MPE user capability required for NRJE manager tasks.

Network services procedure error. An SNA request from the SSCP to the LU indicating an error during session startup or shutdown. On receipt of this message, NRJE logs the content and terminates the LU session.

MPE system supervisor capability.

An operating system is a master control program for a computer.

The priority value at which, or below which, jobs or line printer output will be deferred. Also, the MPE console command which sets the outfence.

The ability to route output by using special form identifiers (formids) in the job JCL. The formids are used to key into a Lookup Table that maps the formid to a file equation identifying the final destination of the output.

See PU.

Programmatic access is a design feature of some systems which allows you to use the system's features from programs you write. SNA NRJE has both command access and programmatic access.

A component of an SNA node. A PU controls the physical resources of a node and reports errors and physical failures to the SSCP. One PU resides in each node. A PU is the access method in a host node, the NCP in the communications controller node, and the hardware and software in peripheral nodes.

A workstation that is not local to the host system, and is configured under the host job entry subsystem. A remote can be connected to its host by communications facilities or by direct attachment.

Request or response header. These are attached to SNA RUs to control data flow and support other network services.

Request or response unit.

Synchronous Data Link Control. SDLC is the data link level communications protocol used in SNA.

An SNA request primarily used to interrupt an LU, to send higher priority data to that LU.

HP's Systems Network Architecture Network Remote Job Entry. This HP product emulates the RJE product on an IBM 8100 minicomputer running the DPPX (Distributed Processing Programming Executive) Operating System. This emulation enables 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.

Systems Network Architecture, a comprehensive specification for distributed data processing developed by IBM. SNA defines a layered protocol for communicating and controlling a communications network within the IBM environment.

The MPE ldev for holding jobs to be sent to the host for a given NRJE workstation.

System services control point. An SSCP manages nodes within its domain. An SSCP stores status information for personnel to maintain a network. It exists only in the host node and is implemented by the communications access method

An SNA request to the SSCP to terminate an LU-LU session.

Transmission header. A transmission header is used by the Transmission Control and Path Control layers for routing and sequencing data sent through an SNA network.

A queue of jobs to be transmitted to the host; spooled reader.

A logical device configured into the operating system that is used to queue files waiting for transmission to the host on a logical reader. (See Also Logical reader).

A common IBM subsystem used to control the input and output of jobs to the VSE operating system environment.

Virtual Telecommunications Access Method. An IBM communications access method which implements SNA on the host.

An intelligent terminal, or a collection of input/output devices managed by a computer or a control unit. An SNA NRJE workstation is a collection of LUs communicating with a host job entry subsystem, transmitting from a common spooled reader.