標準號：ISO/TS 18234-5-2006
中文標準名稱：交通和旅行信息(TTI).通過傳送協議專家組(TPEG)的數據流的TTI.第5部分:公共傳送信息(PTI)應用
英文標準名稱：Traffic and Travel Information (TTI) - TTI via Transport Protocol Expert Group (TPEG) data-streams - Part 5: Public Transport Information (PTI) application
標準類型：R85
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：R85
國際標準分類號：35.240.60
適用范圍：This Technical Specification describes the Public Transport Information (PTI) Application, which is intended tocover all modes of public (i.e. collective) transport as well as inter-urban and intra-urban travel. Theapplication is designed to allow the efficient and language independent delivery of public transport informationdirectly from service provider to end-users.The term “application” is used in TPEG specifications to describe specific applications, such as in this casethe public transport information application, which comprises three information containers: the messagemanagement container, the application event container and the TPEG-location container. The first twocontainers are fully described herein and the TPEG-location container is described in CEN ISO/TS 18234-6.Each TPEG Application (e.g. TPEG-PTI) is assigned a unique number that is called the ApplicationIDentification (AID). An AID is defined whenever a new application is developed. The AID is used within theTPEG-Service and Network Information Application (CEN ISO/TS 18234-3) to indicate how to process TPEGcontent and allows routing of data to an appropriate Application decoder.AID = 0002 (hex) is assigned to the TPEG-PTI application, described in this specification.The TPEG-PTI application aims at describing “legs” of a journey also described as “rides” by othermethodologies. However, it is important to note that TPEG-PTI is not limited to describing single services,because it also allows the more general description of route, service and area-wide problems.Public (or collective) transport information is usually consumed in one of four principle ways as follows:Leader board information as used at stations or terminals;A report on the state of a network;The description of an individual service;As a news flash report.The elements needed to provide information for any one of the four end-user presentation modes are largelythe same. The end-user focus of TPEG applications makes it useful to be able to mimic presentations, towhich end-users are accustomed, for example a railway station indicator board.TPEG-PTI messages can therefore group data elements to present one of the following end-user presentationmodes:Incident message report;Station/terminal information;Route information;Individual service information.It is important to bear in mind that these end-user presentation modes are merely presentational aides; theyhave little to do with the content in the individual data elements. They do, however indicate how data elementsmust be grouped if a presentation in any of these views is intended. Unlike the TPEG-RTM application(CEN ISO/TS 18234-4), TPEG-PTI benefits from the nodal structure of public transport, making use of itsdiscrete start, end and stopping points as well as being limited to fixed, be it real or virtual, routes.