OSI/TS Configuration and Management Manual

Glossary
OSI/TS Configuration and Management Manual—424831-001
Glossary-6
Header token.
Header token. In an SPI message, a token that provides information pertaining to the
message as a whole. Header tokens differ from other tokens in several ways: they exist
in the buffer at initialization and their values are usually set by SSINIT, they can occur
only once in a buffer, they are never enclosed in a list, they cannot be moved to another
buffer with SSMOVE, and programs cannot position to them or retrieve their values
using the NEXTCODE or NEXTTOKEN operation. Programs retrieve the values of
header tokens by passing appropriate token codes to SSGET and can change the values
of some header tokens by passing their token codes to SSPUT.
Examples of header tokens for commands are the command number, the object type, the
maximum-response token, the server-version token, the maximum-field-version token,
and the checksum token. Command and response messages contain a specified set of
header tokens; event messages, a different set with some overlap.
Indication primitive. A primitive issued when a service user (entity) is to be informed
about an event. This is one of four types of service primitives. .
Indirect-process-name. Form of a process name that directs the command through the OSI
manager process first, then on to the specified process type, allowing the management
information base (MIB) to be updated.
Initiator. The entity that initiates a connect request. Initiators and responders are defined
with respect to a single connection. Some entities can be both an initiator and a
responder simultaneously, but not over the same connection.
Intermediate system. Any combination of subnetworks and relay systems used to connect
two or more end systems. Compaq systems are not used as intermediate systems.
Invocation identifiers. A pair of values identifying the application entity and application
process at one end of an ACSE connection. Their settings are left up to the application.
IP (OSI internet protocol). An ISO standard that defines communications in the Network
Layer. This term is not to be confused with the internet protocol of TCP/IP, which is a
different protocol.
IPPDU (IP protocol data unit). See PDU (protocol data unit).
LAPB (link access protocol - balanced). CCITT standards that define in the Data Link
Layer the requirements for X.25 connections over wide area networks (WANs).
Layer. There are seven layers in the OSI Reference Mode: Application Layer.
, Data Link
Layer., Network Layer., Physical Layer., Presentation Layer., Session Layer., or
Transport Layer.
LDIB (Local Directory Information Base). See MIB (Management Information Base)..
LLC (logical link control). An IEEE 802.2 standard for the Data Link Layer of the OSI
Reference Model that defines both connection-oriented and connectionless standards
over LAN networks.