OSI/TS Configuration and Management Manual

Glossary
OSI/TS Configuration and Management Manual—424831-001
Glossary-5
EMS (Event Management Service).
Name Service (DNS), and token-oriented programmatic interfaces to the management
processes for various Compaq subsystems.
EMS (Event Management Service). A part of DSM used to provide event collection, event
logging, and event distribution facilities. It provides for different event descriptions for
interactive and programmatic interfaces, lets an operator or application select specific
event-message data, and allows for flexible distribution of event messages within a
system or network. EMS has an SPI-based programmatic interface for both reporting
and retrieving events.
EMS standard definitions. The set of declarations provided by EMS for use in event
management, regardless of the subsystem. Any application that retrieves tokens from
event messages needs the EMS standard definitions.
End system to intermediate system routing exchange protocol. See ES-IS (end system to
intermediate system) routing exchange protocol.
End system. A host or user machine that contains all seven OSI layers. An end system can
communicate with another end system either directly or through one or more intervening
intermediate systems. Compaq systems function as end systems only.
Entry. A type of object representing a routing table or directory entry in the MIB. Entry
objects are of four types: application (APPL), NSAP, SNPA, and TSEL..
ES-IS (end system to intermediate system) routing exchange protocol. A protocol in the
Network Layer that allows end systems to dynamically exchange address information.
Event. (1) In OSI terms, using APS, a service indication or confirm primitive that an
application retrieves by calling the APS_EVENT_RECEIVE procedure.
(2) In DSM terms, a significant change in some condition in the system or network.
Events can be operational errors, notifications of limits exceeded, requests for action
needed, and so on.
Event Management Service. See EMS (Event Management Service).
Flow control. A function that regulates the flow of data within a layer or between adjacent
layers.
Global network address. See NSAP (network service access point).
and NSAP address.
Header. The initial part of an SPI message. The first word of this header always contains
the value -28; the remainder of the header contains descriptive information about the SPI
message, most of which is accessible as header tokens. The tokens in an SPI message
header differ according to the type of message: the header of a message that contains a
command or response differs somewhat from the header of an event message. An
application can use SSGET or EMSGET calls to retrieve the values of header tokens,
and can use SSPUT calls to change the values of some.