Abbreviations

Results for area 5.4 Communication behaviour

term
turn-around time
definition

period of time it takes a client or server to produce and transmit a response data packet, measured starting from the point at which the last byte of data is received from the other system to the point when the last response byte is transmitted

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term
guaranteed delivery
definition

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

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term
heartbeat
definition

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

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term
maximum turn-around time
definition

maximum amount of time a system is given to provide an appropriate response to the incoming data packet

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term
response time-out period
definition

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

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term
encoding rules
definition

rules which specify the representation during transfer of the values of ASN.1 types

NOTE 1 Encoding rules also enable the values to be recovered from the representation, given knowledge of the type.

NOTE 2 For the purpose of specifying encoding rules, the various referenced type (and value) notations, which can provide alternative notations for built-in types (and values), are not relevant.

term
transport profile
definition

set of services which are responsible for providing a virtually error-free, point-to-point connection so that host A can send data packets to host B and they will arrive uncorrupted

NOTE Connection-oriented transport profiles may also ensure that the data packets arrive in the correct order.

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term
connectionless transport profile
definition

service that provides end-system to end-system communications without any connection set-up

EXAMPLE UDP/IP.

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term
connection-oriented transport profile
definition

service that allows one end-system to exchange a continuous stream of data with another end-system, the data of which is guaranteed to be delivered in the same order in which it was sent without any duplication

NOTE This service is typically achieved by first establishing a connection, then sending the data, and finally terminating the connection.

EXAMPLE TCP/IP.

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term
command
definition

data packet which is prepared by one system in order to control some function(s) of another system

NOTE Commands may be conveyed as a subscription (request) or publication (reply) depending on the design of the specific data exchange.

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term
publication
definition

reply data which have been prepared by a server, usually in response to a subscription

NOTE In some cases, a publication may be termed a “reply” or a “response”.

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term
datagram publication
definition

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

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term
file publication
definition

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

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term
direction discrimination
definition

direction of travel of a target within the detection zone

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term
subscription
definition

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

NOTE In some cases, a subscription may be termed a “request”.

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term
silently drop
definition

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.

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