OSI/MHS Configuration and Management Manual

OSI/MHS Configuration and Management Manual—424827-003
Glossary-6
data communications standard definitions. In DSM, the set of declarations provided by
HP for use in all management applications that manage or retrieve event messages
from HP NonStop data communications subsystems. The names of these definitions
start with either ZCOM or ZCMK. See also definition files, SPI standard definitions, or
EMS standard definitions.
Data Link Layer. Layer 2 in the OSI Reference Model. This layer packages data for
transmission across the physical link and ensures that the data arrives at the next layer
without any errors.
data list. In DSM programmatic interfaces, a group of tokens used to separate response
records within an SPI message for a response, or to enclose a single response record,
if the program so requests. A data list consists of a list token that denotes a data list
(different from the token that starts an error list or a generic list), followed by a
response record and an end-list token.
decoding. The process of changing ASN.1 encoded (BER) data into a local representation.
See also encoding and BER.
definition. A declaration provided by HP for use in applications that use a specific
procedural interface, such as the APS or SPI procedures. Definitions are commonly
provided in definition files.
definition files. A set of files containing declarations for use in applications that use a
specific procedural interface.
In the case of the Subsystem Programmatic Interface (SPI), there is a standard
definition file in Data Definition Language (DDL) and a definition file for each of the
programming languages supporting SPI; the latter files are derived from the DDL
definition file. Likewise, each subsystem that has a token-oriented programmatic
interface has one definition file for DDL and one for each programming language.
Some subsystems—for instance, data communications subsystems—have additional,
shared definition files. See also SPI standard definitions, data communications
standard definitions, or EMS standard definitions.
delivery report. A communication directed by an MTA toward the originator of a message,
indicating when the message was delivered to each recipient UA, as well as other
information, such as when the message arrived in each management domain through
which it passed on the way to its destination. See also nondelivery report.
diagnostic code. A value indicating why a message was not delivered (called a non-
delivery-diagnostic code in the X.411 standard).
Distributed Systems Management. See DSM.