application layer (L7)

top layer of the OSI seven-layer model as defined in ISO/IEC 7498-4
NOTE: This layer defines the structure and format of the data packet content along with the rules and procedures for exchanging data packets.

top layer of the OSI seven-layer model as defined in ISO/IEC 7498-4
NOTE: This layer defines the structure and format of the data packet content along with the rules and procedures for exchanging data packets.

connected unit; ITS connected unit

electronic device that is connected using one or more communication media

electronic device that is connected using one or more communication media

connectionless transport profile

service that provides end-system to end-system communications without any connection set-up
EXAMPLE: UDP/IP.

service that provides end-system to end-system communications without any connection set-up
EXAMPLE: UDP/IP.

data packet

entity of data that can be sent between end-application systems in order to exchange information
NOTE: A data packet relates to the Application Layer of the OSI stack and may be broken into several pieces by lower layer protocols.

entity of data that can be sent between end-application systems in order to exchange information
NOTE: A data packet relates to the Application Layer of the OSI stack and may be broken into several pieces by lower layer protocols.

data update mode (UM)

the regime for providing updates to the high level data objects

the regime for providing updates to the high level data objects

datagram

entity of data containing enough information to be routed from source to destination without relying on previous network configuration
EXAMPLE: IP datagram.

entity of data containing enough information to be routed from source to destination without relying on previous network configuration
EXAMPLE: IP datagram.

datagram publication

DATEX-ASN publication (reply) that is sent directly over the given transport profile, in contrast with a file publication

DATEX-ASN publication (reply) that is sent directly over the given transport profile, in contrast with a file publication

destination

system or device to which the information in the data packet is intended to be sent

system or device to which the information in the data packet is intended to be sent

Ethernet

specific combination of physical and data link layer protocols as defined in IEEE 802.3 that allow multiple systems to gain access to a shared medium and communicate with one another

specific combination of physical and data link layer protocols as defined in IEEE 802.3 that allow multiple systems to gain access to a shared medium and communicate with one another

file publication

DATEX-ASN publication (reply) that is stored on the server’s file system until the client has an opportunity to retrieve it via a file transfer protocol, in contrast with datagram publication

DATEX-ASN publication (reply) that is stored on the server’s file system until the client has an opportunity to retrieve it via a file transfer protocol, in contrast with datagram publication

FEP

functional exchange profile

guaranteed delivery

DATEX-ASN mechanism in which the client acknowledges the receipt of a publication (reply)

DATEX-ASN mechanism in which the client acknowledges the receipt of a publication (reply)

heartbeat

data packet sent to indicate that the sending system is still alive and communicating

data packet sent to indicate that the sending system is still alive and communicating

internet protocol (RFC 791) (IP)

the network protocol offering a connectionless mode network service in the Internet suite of protocols

the network protocol offering a connectionless mode network service in the Internet suite of protocols

MPD

message processing and dispatching

network layer (L3)

layer that provides functional and procedural means of transferring variable length data sequences from a source to a destination
NOTE: The network layer constitutes layer 3 of the OSI model.

layer that provides functional and procedural means of transferring variable length data sequences from a source to a destination
NOTE: The network layer constitutes layer 3 of the OSI model.

open systems interconnection (OSI)

reference model developed by ISO to enable different or similar systems to dialogue with one another
NOTE 1: This model constitutes a reference framework for describing data exchanges. Each layer performs a service at the request of the adjacent higher layer, and in turn, requests more basic services from the lower layers. It is described in 7 layers.
NOTE 2: Open systems interconnection …

reference model developed by ISO to enable different or similar systems to dialogue with one another
NOTE 1: This model constitutes a reference framework for describing data exchanges. Each layer performs a service at the request of the adjacent higher layer, and in turn, requests more basic services from the lower layers. It is described in 7 layers.
NOTE 2: Open systems interconnection (OSI) is an international effort to facilitate communications among computers of different manufacture and technology.

OSI model

the International Standards Organization has developed a reference model, the Open Systems Interconnection (OSI) model, to enable different or similar systems to dialogue with one another; this model constitutes a reference framework for describing data exchanges; it is described in 7 “layers”

the International Standards Organization has developed a reference model, the Open Systems Interconnection (OSI) model, to enable different or similar systems to dialogue with one another; this model constitutes a reference framework for describing data exchanges; it is described in 7 “layers”

port

logical channel in a communications system
NOTE: UDP and TCP use port numbers to multiplex data packets from a variety of applications onto a single communications system.
physical element of a node where a link is connected; nodes may have one or more ports;each
port may connect to one or more physical ports on (sub) nodes that are contained within the node

logical channel in a communications system
NOTE: UDP and TCP use port numbers to multiplex data packets from a variety of applications onto a single communications system.
physical element of a node where a link is connected; nodes may have one or more ports;each
port may connect to one or more physical ports on (sub) nodes that are contained within the node

port number

identifier of an application-entity to a transport service in the internet suite of protocols
NOTE: The concept of port numbers is often present in OSI literature; however, port numbers are not inter-network standardized, but exist as local network conventions only.

identifier of an application-entity to a transport service in the internet suite of protocols
NOTE: The concept of port numbers is often present in OSI literature; however, port numbers are not inter-network standardized, but exist as local network conventions only.

presentation layer (L6)

layer that converts data using different syntax
NOTE: The presentation layer constitutes layer 6 of the OSI model.

layer that converts data using different syntax
NOTE: The presentation layer constitutes layer 6 of the OSI model.

receipt

data which is prepared by the receiver of the subscription or publication in order to acknowledge the order

data which is prepared by the receiver of the subscription or publication in order to acknowledge the order

session

period of time during which a client and a server exchange multiple data packets

period of time during which a client and a server exchange multiple data packets

session layer (L5)

layer that manages the dialogue between end-user application processes including restart, termination, and checkpointing
NOTE: The session layer constitutes layer 5 of the OSI model.

layer that manages the dialogue between end-user application processes including restart, termination, and checkpointing
NOTE: The session layer constitutes layer 5 of the OSI model.

silently drop

to ignore a data packet
NOTE: A data packet that is silently dropped does not cause any action to occur within the receiving system, nor is any response sent to the subject data packet.

to ignore a data packet
NOTE: A data packet that is silently dropped does not cause any action to occur within the receiving system, nor is any response sent to the subject data packet.

SNMP

simple network management protocol

STMP

simple transportation management protocol

SNMP application

internal architectural component of the SNMP architecture as defined in IETF RFC 3411
NOTE 1 to entry: Defined SNMP applications include the command generator, command responder, notification
originator, notification receiver, and proxy forwarder.

internal architectural component of the SNMP architecture as defined in IETF RFC 3411
NOTE 1 to entry: Defined SNMP applications include the command generator, command responder, notification
originator, notification receiver, and proxy forwarder.

transmission control protocol / internet protocol (TCP/IP)

a transport protocol that provides reliable, bidirectional, stream-oriented network communication; TCP/IP is one of the foundation protocols of the Internet

a transport protocol that provides reliable, bidirectional, stream-oriented network communication; TCP/IP is one of the foundation protocols of the Internet

transport layer (L4)

layer that provides transparent transfer of data between end users
NOTE: The transport layer constitutes layer 4 of the OSI model.

layer that provides transparent transfer of data between end users
NOTE: The transport layer constitutes layer 4 of the OSI model.