SNAX/XF LU Network Services Manual

Glossary
097841 Tandem Computers Incorporated Glossary–7
establish a data path between two LUs in separate domains for data exchange, four
types of sessions must exist: SSCP-SSCP, SSCP-PU, SSCP-LU, and LU-LU.
session passthrough. A SNAX/XF feature that allows the SNA host to control SNA
devices on Tandem NonStop systems as if they were directly connected to the host.
site update tape (SUT). The means by which Tandem software is distributed to all user
sites.
SLU. See secondary logical unit.
SNA. Systems Network Architecture.
SNALU. SNAX Application Logical Unit. A SNAX/XF application protocol that
provides the functions of the lower two SNA layers (data link control and path
SNAX/APC. SNAX/APC is a high-level programmatic interface that allows Tandem
applications to communicate with LU 6.2 applications running in an SNA network.
SNAX Creator-2 process. An ancillary process to SNAX/XF that can accept
session-establishment requests for TACL and Pathway application processes. The
SNAX Creator-2 process allows users to create a configuration database by using SCF.
SNAX/HLS. SNAX/HLS is a Tandem interface that allows Tandem applications to
communicate with non-3270 intelligent SNA devices and IBM host-resident software
products.
SNAXLink. A Tandem product comprised of both hardware and software that provides
a direct channel link between a Tandem system and several types of IBM systems.
SNAXLink can also be used with IBM channel-compatible systems that contain VTAM
and SNA support.
SNAX/XF. SNAX/XF is a Tandem communications access method that implements part
of the IBM Systems Network Architecture (SNA). SNAX/XF allows applications on a
Tandem system to communicate with attached SNA devices and with programs
residing on a host system.
SNP. See subarea node process.
SPI. See Subsystem Programmatic Interface.
SPI message. A message specially formatted by the SPI procedures for communication
between a management application and a subsystem, or between one subsystem and
another. The message consists of a collection of tokens. Note that an SPI message is a
single block of information sent at one time as one interprocess message. There are
two types of SPI messages, distinguished by different sets of tokens in the header:
command and response messages, and event messages.
spooler. A process and storage area used when information is gathered faster than it
can be used. For example, a print spooler holds large amounts of information to be
printed and then sends it to the printer one unit at a time.
SSCP. See system services control point.
structure. A data item with multiple fields, possibly of different types.