ETSI - European Telecommunications Standards Institute
Latest
PRETS 300 708-1996
Scope
"This European Telecommunication Standard (ETS) describes the various ways in which Teletext may be used to carry non-Teletext services. It should be used in conjunction with ETS 300 706 [1]. An example is fully described in ETS 300 707 [2]. This ETS includes additional practical information on implementing a data service of this type. Hooks into existing Teletext services may be provided from within the application which is carried as a non-Teletext service. A data broadcast application may be pointed to from the Magazine Inventory Page (MIP) or it may be allocated a specific page number. A Code of Practice (CoP) shall ensure that services destined for the consumer may be found quickly by ""low-end"" Teletext decoders but this is outside the scope of this ETS. There are two methods available for carrying data services. The first method carries the data within Teletext pages. The data in these pages is not sui for direct display by a Teletext decoder and shall normally be allocated a special page number and/or have the display inhibited. The second method carries the data within Independent Data Lines (IDL) and these are independent of the page service. With both Page and IDL formats there exist versions which offer Conditional Access (CA). There are other specific IDL data services which have been defined but it is beyond the scope of this ETS to cover all of these."