OSI/AS Management Programming Manual

Glossary
Glossary-22 056785 Tandem Computers Incorporated
Synchronization point. A marker that a Session Layer application can insert into the data
it is transmitting, to structure the exchange of data. There are two types: major
synchronization points and minor synchronization points. See also major
synchronization or minor synchronization.
Synchronize minor token. One of the four types of Session Layer tokens that are
associated with functional units. See Token and Functional unit.
SYSGEN. The Tandem system generation program, used to configure objects such as
devices, controllers, and I/O processes in a newly installed system, or to update the
system when new software is released. Objects to be configured are defined to
SYSGEN in a special configuration file, which can then be cold loaded into the system.
The Tandem OSI products are not configured with SYSGEN, but the underlying
X25AM and TLAM I/O processes are.
Tandem internal token. In DSM, an event message token that is intended for
interpretation and use only by Tandem software. Compare conditional token or
unconditional token.
TAPS (Tandem application, presentation, and session) process. A process in the OSI/AS
subsystem that performs service and protocol functions for ACSE (in the Application
Layer), the Presentation Layer, and the Session Layer. The TAPS process also
performs some management services in the DSM environment.
TLAM (Tandem LAN access method). A Tandem product that implements, for LANs, the
services of the Data Link Layer and layers below.
Token. (1) An attribute of a Session Layer connection, dynamically assigned to one
session service user at a time, that confers the exclusive right to perform a given
function. For example, in half-duplex mode, if a local application holds the data token,
it can send data; before the remote application can send data, it must acquire the data
token from the local application. There are four session tokens; each is associated with
a functional unit:
Token Associated Functional unit
data Half-duplex
major/activity Major synchronize
Activity management
release Negotiated release
synchronize-minor Minor synchronize
The availability of each token depends on which functional units are used on the
connection. See also functional unit.
(2) In DSM terms, a distinguishable unit in an SPI message. Programs place tokens in
an SPI buffer using the SSPUT or SSINIT procedures and retrieve them from the buffer
with the SSGET procedure. A token has two parts: an identifying code, or token code,
and a token value. In command and response messages, a token normally represents a
parameter to a command, an item of information in a response, or control information
for the subsystem. In event messages, a token normally represents an item of
information about an event or about the event message itself. See also header token.