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.

occupancy based detector

detector that detects vehicles and traffic characteristics based on the state of the occupancy using methods such as loop or magnetic detectors

detector that detects vehicles and traffic characteristics based on the state of the occupancy using methods such as loop or magnetic detectors

OER

octet encoding rules

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.

origin

system or device which was the source for all of the information in the data packet
NOTE: In many cases, this will be the same as the sender, but could be different. For example, a bridge (or proxy agent) may translate between protocols; in this case the bridge (or proxy agent) would be the sender, while the system generating the data would be the origin.

system or device which was the source for all of the information in the data packet
NOTE: In many cases, this will be the same as the sender, but could be different. For example, a bridge (or proxy agent) may translate between protocols; in this case the bridge (or proxy agent) would be the sender, while the system generating the data would be the origin.

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.

publication

data which has been prepared by a supplier, and made available

data which has been prepared by a supplier, and made available

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

response time-out period

maximum duration a system is required to wait for a response data packet prior to assuming that the previously sent data packet was never received by the other application

maximum duration a system is required to wait for a response data packet prior to assuming that the previously sent data packet was never received by the other application

restricted use of data (RU)

indicator whether the use of data is restricted or not

indicator whether the use of data is restricted or not

roadside communication unit

roadside equipment that communicates with the in-vehicle units and the roadside units, e.g. beacons and antennas

roadside equipment that communicates with the in-vehicle units and the roadside units, e.g. beacons and antennas

roadside modules

terminal units controlled or monitored by a traffic management centre
NOTE: Roadside modules are usually installed at the roadside arena.

terminal units controlled or monitored by a traffic management centre
NOTE: Roadside modules are usually installed at the roadside arena.

roadside unit; ITS roadside unit (RSU)

part of connected roadside equipment that provides wireless connectivity to vehicle systems and/or personal systems

part of connected roadside equipment that provides wireless connectivity to vehicle systems and/or personal systems

saturation flow rate

equivalent hourly rate at which vehicles can traverse an intersection approach, assuming a constant
green indication at all time and no loss time
NOTE 1 to entry: It is expressed in vehicles per hour or vehicles per hour per lane.

equivalent hourly rate at which vehicles can traverse an intersection approach, assuming a constant
green indication at all time and no loss time
NOTE 1 to entry: It is expressed in vehicles per hour or vehicles per hour per lane.

server

computer or application which receives and responds to requests for data from client computers or applications using some kind of protocol

computer or application which receives and responds to requests for data from client computers or applications using some kind of protocol

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.

shipping agent

independent person or corporation acting as a representative, usually in a foreign market, who attempts to sell products for an overseas seller (principal) and earns a commission on successful sales
NOTE 1 to entry: Agents are not normally involved in delivery or servicing of product.

independent person or corporation acting as a representative, usually in a foreign market, who attempts to sell products for an overseas seller (principal) and earns a commission on successful sales
NOTE 1 to entry: Agents are not normally involved in delivery or servicing of product.

signal controller

roadside equipment that controls the lighting timings of traffic lights

roadside equipment that controls the lighting timings of traffic lights

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.

spatial data set (SS)

identification, version and date of the spatial data set used

identification, version and date of the spatial data set used

SMIv2

Structure of Management Information version 2

subscription

data which is prepared by a client in order to request current or future publication(s)

data which is prepared by a client in order to request current or future publication(s)

supplier

computer or application that receives and responds to requests for data from client computers or applications using a protocol

computer or application that receives and responds to requests for data from client computers or applications using a protocol