TCP/IP Management Programming Manual

Glossary
HP NonStop TCP/IP Management Programming Manual—529636-001
Glossary-3
compatibility distributor
compatibility distributor. An EMS distributor process that filters event messages
according to fixed (rather than user-specified) criteria, obtains text for these messages
that is compatible with the operator console of Guardian operating system versions
earlier than C00, and writes the text to the standard Guardian console-message
destinations. See also distributor.
conditional token. In DSM event management, a token that is sometimes, but not always,
present in a particular event message.
connection. The path between two protocol modules that provides reliable stream delivery
service. In the Internet, a connection extends from a TCP module on one machine to a
TCP module on another machine.
connectionless service. Characteristic of the packet delivery service offered by most
hardware and by the Internet Protocol (IP). The connectionless service treats each
packet or datagram as a separate entity that contains the source and destination
address. Usually, connectionless services can drop packets or deliver them out of
sequence.
consumer distributor. An EMS distributor process that returns selected event messages to
management applications upon request. See also distributor.
context token. In DSM programmatic interfaces, a token in an SPI response message that
indicates (by its presence or absence) whether or not the response is continued in the
following message. If this token is present, the response is continued. To obtain the
next message, the application program reissues the original command with one
modification: the context token is included in the new command message. When the
subsystem sends a response message that does not contain a context token, the
series of response messages is complete.
control and inquiry. In DSM, those aspects of object management that affect the state or
configuration of an object, such as inquiries about the object and commands pertaining
to the environment (for example, commands that set default values for the session).
Compare event management
.
critical event. A DSM event that is considered to be crucial to the operation of the system
or network. Each subsystem determines which of its events are critical, designating
them as such by setting the value of the emphasis token to TRUE. Compare noncritical
event.
Carrier Sense Multiple Access (CSMA). A characteristic of network hardware that
operates by allowing multiple stations to contend for access to a transmission medium
by listening to see if it is idle.
Carrier Sense Multiple Access with Collision Detection (CSMA/CD). A characteristic of
network hardware that uses CSMA access combined with a mechanism that allows the
hardware to detect when two stations simultaneously attempt transmission. Ethernet is
an example of a well-known network based on CSMA/CD technology.