OSI/MHS P7 Application Programmatic Interface (P7 API) Manual

Glossary
OSI/MHS P7 Application Programmatic Interface (P7 API) Manual—424825-001
Glossary-20
port address
interface that applications can use by making file-system procedure calls. The PAM
subsystem implements, for LANs, the services of the Data Link Layer and layers below.
PAM replaces the Tandem LAN Access Method (TLAM) for G06 and later releases.
port address. For X25AM lines, the logical port number used to specify the address of the
connection to the X.25 network. For TLAM lines, the address used by TLAM to specify
the address of the connection to a LAN controller.
Presentation Layer. Layer 6 in the OSI Reference Model. This layer resolves the
differences of varying data formats between systems of different vendors. It transfers
data in a system-independent manner, performing appropriate conversions at each
system as necessary.
presentation selector. See PSEL.
primitive. See service.
printable string. An ordered set of characters that can include alphanumeric characters,
spaces, and any of the following symbols: ' ( ) + , - . / : ? This character set
corresponds to the repertoire of telex terminals and similar devices.
printing distributor. An EMS distributor process that obtains formatted text for select event
messages and distributes it to a printer or other display device, or to a file.
priority. In OSI/MHS, the order in which alternate routes are attempted. Priority values are
relative only to the other priorities for a particular MTA.
Also, a classification of an X.400 message as normal, urgent, or non-urgent. The
message priority is included, along with other delivery instructions, in the envelope of
an X.400 message and is a factor in the routing of messages through the X.400 network.
The P2 protocol defines a parallel (but unrelated) concept of message importance, which
is intended to be meaningful to the recipient or the recipient UA.
private management domain. See PRMD.
PRMD (private management domain). An X.400 domain managed by a private
organization, such as a corporation. See also domain.
probe. An X.400 communication sent by an originator into the MTS to test the likelihood of
delivery of a message or report. It consists of an envelope and the description of the
actual content of the message or report. The envelope is similar to, but not the same as,
an envelope that would be used for an actual message or report.
process. A running entity that is managed by the operating system, as opposed to a program,
which is a collection of code and data. A process is a unique execution of a program.
PROCESS object. An object type, used in OSI/MHS management interfaces, that defines a
process to the OSI/MHS subsystem. You use the PROCESS object to trace and monitor
OSI/MHS processes.