Transport information and control systems. Data interfaces between centres for transport information and control systems - DATEX-ASN

Transport information and control systems. Data interfaces between centres for transport information and control systems - DATEX-ASN

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1   Scope

DATEX-ASN allows different systems to exchange relevant data. This is contained in end-application messages. Each end-application message is defined as either a “subscription” or a “publication” according to the format as specified in ISO 14827-1. DATEX-ASN defines how these end-application messages are packaged to form a complete data packet and also defines the rules and procedures for exchanging these data packets. Systems using DATEX-ASN are free to implement additional end-application functionalities according to the user requirements.
A DATEX-ASN network comprises a certain number of systems, an example of which is provided in Figure 1.
Figure 1 — An example of a DATEX-ASN network
fig_1
Key
1 weather system
2 traffic management system
3 transit management system
4 emergency management system
5 information service provider
Each system can be viewed as consisting of the interfaces, as shown in Figure 2:
Figure 2 — System interfaces
fig_2
Key
1 application interface
2 operator interface
3 communication interface
4 database interface
5 communications cloud
6 client system
7 server system
This part of ISO 14827 deals only with the communications interface. It has been designed to meet the unique requirements of TICS; however, it has been designed in a generic fashion and thus could be used for other data exchanges as well.
Systems implementing this part of 14827 sometimes operate simultaneously as a client and server, using multiple sessions. The communications cloud between the two systems may be complex or simple.