LU type 3
An LU type 3 is for an application program that communicates with a single
printer using the SNA 3270 data stream. Another name for this connection is Data
Stream Extended (DSE). This type of connection will not support the SCS data
stream and may be used when no host controls are to be sent to the printer. An
example of printers that may use this method of connection are 4230, 3912, 6500-v,
3930, and others.
LU type 4
LU type 4 is seldom used today. It is used for (1) an application program that
communicates with a single or multiple-device data processing or work processing
workstation in an interactive, batch data transfer, or distributed data processing
environment (for example, an LU for an application program that uses CICS/VS
and communicates with an IBM 6670 Information Distributor); or (2) logical units
in peripheral nodes (for example, two 6670’s) that communicate with each other.
The data stream is the SNA Character String (SCS) for data processing
environments and Office Information Interchange (OII) Level 2 (a precursor of
DCA) for word processing environments.
LU type 6.1
An LU type 6.1 is for an application subsystem that communicates with another
application subsystem in a distributed data processing environment. An example
of an LU type 6.1 is an application program that uses CICS/VS and communicates
with an application program that uses IMS/VS.
LU type 6.2
An LU type 6.2 supports sessions between two applications in a distributed data
processing environment. The data stream is either the SNA General Data Stream
(GDS), which is a structure-field data stream, or a user-defined data stream. LU 6.2
session provide communication between (1) two PU type 5 nodes (host
resource-owning VTAM), (2) a PU type 5 node and a PU type 2.1 node, and (3)
two PU type 2.1 nodes. Examples (1) VTAM-to-VTAM communication, or an
application program that uses CICS/VS and communicates with another
application program that uses CICS/VS, (2) An application program which uses
VTAM and PSF/MVS communicating with an IBM 3820, 3935, or PSF/2; or (3)
Two iSeries communicating in APPC mode.
LU type 7
An LU type 7 is for an application program and a single display workstation in an
interactive environment. An example of an LU type 7 is an application program in
an iSeries communicating with a 5250-type terminal. The data stream is the 5250
data stream.
286 Infoprint 6500 User’s Manual
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