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Glossary
OSI/FTAM Responder Manual—425199-001
Glossary-20
The PSAP is highly system-dependent and generally refers to the way interlayer
communication is accomplished. See also SAP.
PSAP address. A presentation address that is used to identify a single PSAP.
PSEL (presentation selector). A logical address in the Presentation Layer through
which presentation services are made available to Application Layer implementations.
On a Compaq system, the PSEL is a number that uniquely links a TAPS process with a
process that implements Application Layer services—for example, an FTAM initiator or
responder.
PTrace (print trace). A Compaq utility that you can use to select, format, and display
unstructured trace data generated when you issue the SCF TRACE command.
read functional unit. A functional unit that allows the following activities on an
association:
•
Establishing the file-open regime
•
Transferring data from the responder to the initiator
•
Releasing the file-open regime
receiver. The entity that receives a communication from a remote sender. See sender.
recovery functional unit. An ISO FTAM functional unit that allows the initiator process
to recreate a previously destroyed regime.
regime. A protocol state that reflects the programming status in an FTAM program
sequence. Compaq FTAM and ISO FTAM have four regimes: FTAM regime, file-
selection regime, file-open regime, and data-transfer regime.
register request. (1) For Compaq FTAM, a request made by the FTAM API to the
APLMGR process, on behalf of an application, to establish an FTAM association.
Processing an FTAM register request includes selecting an available initiator process to
service the association. (2) For Compaq OSI/AS, a request made by the API to the OSI
manager process, on behalf of an application, either to establish an association
(or connection) or to wait for an incoming association (or connection).
relaxation. The process of deriving one document from another by making the
parameters describing it less restrictive. In particular, the legal modification of values
for the maximum-string-length, string-significance, or universal-class parameters for a
specific FTAM document type. String-length relaxation allows a document of with a
given maximum-string-length value to be opened and read using a larger maximum-
string-length value or no maximum-string-length value (unbounded string). Character-
set relaxation allows a document of a given universal-class number to be opened and
read using a different universal-class number as long as the new universal-class number
permits all characters from the original universal-class number.
request primitive. A primitive issued when a service user (entity) wants the service to
do some work. This is one of four types of service primitives. See service primitive.
request procedure. A procedure called to cause the initiating process to send a request
primitive to a responding process. See request primitive.