SNA NRJE User/Programmer Reference Manual (30292-90006)

Chapter 1 29
Introducing SNA NRJE
Introduction
output device that holds submitted jobs until they are transmitted to
the host. Workstations receive output data sets from the host via
logical writers.
NRJE assembles job input into a spool file. When communications with
the host exist, job input spool files are transmitted to a host system as
logical card reader data streams. Job output data is received from the
host system in logical printer and punch data streams at the
workstation and is then routed to the appropriate destination. The
remote host console sends commands from the workstation to the host
and receives console messages at the workstation from the host.
An NRJE workstation communicates with a job entry subsystem at a
host. The job entry subsystem is under the control of the host operating
system.
Several NRJE workstations can operate on an HP 3000. You must
always identify which NRJE workstation you want to access.
One spooled reader, a virtual reader, must be configured for each
NRJE workstation. The spooled reader is used for queued transmission
from an HP 3000 to the host system. A virtual reader on an HP 3000
has no corresponding definition at the host.
NRJE users can submit jobs whether or not their HP 3000 is
communicating with the host system. An NRJE user submits a job by
designating a set of MPE files. A spool file is created and receives the
MPE job input files in the order they are designated. Each spool file is
an element in the workstation transmission queue. When
communication with the host starts and the host system is accepting
job input, each job is transmitted according to its position in the queue.
If communication with the host system is not active, or if the host
system is not accepting job input, the job remains in the transmission
queue. Direct transmission of a job to the host--transmitting a job
without first entering job input data into the transmission queue--is not
supported.
A workstation and host communicate with each other in an LU-LU
session. In SNA, a workstation is a set of logical units (LUs). The job
entry subsystem at the host is also an LU. In an LU-LU session
between a workstation and a host, NRJE retrieves job input data,
translates and compresses it when requested, prefixes SNA format
headers, and passes it to the SNA link product on the HP 3000. The
SNA link product transmits the data to the host. A spool file containing
job input data is retained until it is successfully transmitted.
NOTE In this manual, the term SNA link product is used when the
information being given is true for all of the SNA link products: SNA
Link/V, SNA/SDLC Link/XL, and SNA/X.25 Link/XL. The terms SNA
Link/V, SNA/SDLC Link/XL, and SNA/X.25 Link/XL are used when
a distinction among the three products is necessary.