Table of Contents

Foreword
1 Scope
2 Normative references
3 Definitions, symbols and abbreviations
  3.1 Definitions
  3.2 Symbols
  3.3 Abbreviations
4 TV lines usable as data lines
  4.1 When multiplexed with a composite video signal
  4.2 When not multiplexed with a composite video
      signal
5 Signalling channel
  5.1 Signalling method
  5.2 Data Signal Levels
  5.3 Bit Rate
  5.4 Spectrum of data pulses
6 Teletext packet identification
  6.1 Clock run-in
  6.2 Framing code
  6.3 Timing reference
7 Organization of Teletext data elements
  7.1 Elements of a Teletext packet
  7.2 Elements of a page
  7.3 Elements of a magazine
  7.4 Elements of the service
8 Byte coding and error protection
  8.1 Odd parity
  8.2 Hamming 8/4
  8.3 Hamming 24/18
9 Coding of data packets
  9.1 Overview of packet types
  9.2 Reserved bits
  9.3 Directly displayable data packets
  9.4 Page enhancement data packets
  9.5 Magazine-Related Page Enhancement Data Packets
  9.6 Packets for Page Linking
  9.7 General Coding of packets 30 and 31
  9.8 Broadcast Service Data Packets
10 System Components for Presentation
  10.1 Basic Teletext - Presentation Levels 1 and 1.5
  10.2 Enhanced Teletext - Presentation Levels 2.5 and
       3.5
  10.3 Page Specific Enhancement Data
  10.4 Magazine Specific Enhancement Data
  10.5 Public Enhancement Data
  10.6 Magazine Organization Table
  10.7 Links between Enhanced System Components
11 System Components for Navigation
  11.1 Navigation via FLOF
  11.2 Navigation via TOP
  11.3 Magazine Inventory Page
12 Presentation Levels
  12.1 Display Components
  12.2 Spacing attributes
  12.3 Non-spacing attributes and additional
       characters
  12.4 Colour Map
  12.5 Side Panels
13 Objects
  13.1 Object definitions
  13.2 Display priority order
  13.3 Active Objects
  13.4 Adaptive Objects
  13.5 Passive Objects
  13.6 Object invocation
  13.7 Screen position of Object elements
  13.8 Default Objects
  13.9 Object example
14 Dynamically Re-definable Characters
  14.1 Downloading pages
  14.2 DRCS Character Modes
  14.3 Flashing DRCS
  14.4 DRCS availability
15 Character sets and their designation
  15.1 Overview of designation requirements
  15.2 Designation of default G0 and G2 sets and
       national option sub-sets
  15.3 Second G0 Set Designation and National Option
       Set Selection
  15.4 Modified G0 and G2 Character Set Designation
  15.5 Spacing attributes
  15.6 Alphanumeric Character Sets
  15.7 Graphics Character Sets
Annex A (normative): Encoding Rules
  A.1 Page numbering
  A.2 Use of control bits C4 (Erase Page) and C8
      (Update Indicator)
  A.3 Backwards compatibility in X/26 addressing
  A.4 Addressing order for enhancement triplets
  A.5 Rules for row and screen colours
  A.6 Object definition pages
  A.7 Rules for the overlapping and interleaving of
      objects
  A.8 Number of objects per page
  A.9 Coding of packets 8/30, Formats 1 and 2
Annex B (normative): Transmission Rules
  B.1 Transmission of basic Teletext pages with a page
      erasure interval
  B.2 Transmission order of packets with Y = 26, 27
      and 28
  B.3 Serial mode transmission
  B.4 Parallel mode transmission
  B.5 Transmission of packets 8/30
  B.6 Rules for the transmission of presentation
      enhancement data
  B.7 Transmission sequence of enhancement data for
      page updates
  B.8 Rules for the transmission of Magazine Inventory
      Pages (MIP)
Annex C (normative): Decoding Rules
  C.1 Relationship between the display planes
  C.2 Rules for determining priorities of spacing and
      non-spacing attributes
  C.3 Rules applying to the size attributes
  C.4 Interpretation of character set and DRCS table
      changes at enhanced levels
Annex D (normative): Default operation of decoders
  D.1 Page level
  D.2 Magazine level
  D.3 Service level
Annex E (informative): Encoding aspects
  E.1 Page numbers for object definition and DRCS data
      pages
  E.2 Page Time-Code
  E.3 Use of packets X/26 in Level 1.5 transmissions
  E.4 Preferred use of packets X/27/4 and X/27/5
  E.5 Character set designation
  E.6 Use of DRCS characters within objects
  E.7 Objects in row 24
  E.8 Limits for global enhancement data
  E.9 Selection of national option sub-sets
  E.10 Characters including diacritical marks
  E.11 Invocation of default objects
Annex F (informative): Transmission aspects
  F.1 Cycle Times
  F.2 Interrupted pages
  F.3 Packets M/29
  F.4 Allocation of Teletext packets to VBI lines
  F.5 Use of lines 22 and 335
  F.6 Teletext transmissions outside of the VBI
Annex G (informative): Decoding aspects
  G.1 Mixed mode operation of decoders
  G.2 Character display
  G.3 Behaviour of display attributes
  G.4 Minimum decoder configurations
Annex H (informative): Code of Practice for navigation
         via FLOF
  H.1 Objectives
  H.2 Packets with Y = 27 for automatic page
      acquisition
  H.3 Packets with Y = 24
  H.4 Fall-back conditions
Annex I (informative): Navigation via Table Of Pages
        (TOP)
  I.1 Objectives
  I.2 Main principles
Annex J (informative): Magazine Inventory Pages (MIP)
Annex K (informative): VCR programming and control via
         Teletext
Annex L (informative): Use of Teletext Data for
         Automatic Channel Installation
Annex M (informative): Data transmission via Teletext
Annex N (informative): Data broadcasting services
  N.1 Electronic Programme Guide (EPG)
Annex O (informative): Relationship to earlier
         specifications
Annex P (informative): Non-Teletext signals in the VBI
Annex Q (informative): Bibliography
History

Abstract

Provides the application of CCIR Teletext System B to CCIR 625 Line 50 field Television Systems B, D, G, H, I, K and L.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	European Telecommunications Standards Institute
Pages
ISBN
Committee	BROADCAS
Supersedes	PRETS 300 706 : NOV 96