SIST ETS 300 072:2003/A1 E1:2003

• Abstract:

  The syntax needs to be extended with non latin languages (cyrillic, arabic..). In addition updates for mosaic display are necessary. Combination rules between text, geometric and photographic have to be added

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 35.100.60 - Presentation layer
• ICS: 35.180 - IT Terminal and other peripheral equipment
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI ETS 300 072/A1 ed.1 (1996-10) - Terminal Equipment (TE); Videotex presentation layer protocol; Videotex presentation layer data syntax

SIST ETS 300 072:2003/A1 E1:2003 is the Slovenian standard identical to ETS 300 072/A1 Edition 1, published by SIST and based on an ETSI amendment to the Videotex presentation layer data syntax. It updates the Videotex presentation layer protocol for non-Latin character sets, display structure handling, and terminal configuration switching, so it is aimed at people implementing or testing Videotex terminals and services.

What does SIST ETS 300 072:2003/A1 E1:2003 specify?

SIST ETS 300 072:2003/A1 E1:2003 specifies additional data syntax elements for ETS 300 072. In practice, it extends the Videotex presentation layer for Cyrillic, Arabic, Hebrew and Chinese support, adds a second display structure, and adds a switching mechanism between Videotex terminal configurations.

The amendment only adds material to ETS 300 072 and contains no deletions to the existing content.

Part / annex	What it covers
Part 0	Display structure, normative references, abbreviations
Part 1	Character repertoires, code sets, designation rules, Appendix A symbols
Annex C	Non-Latin character set designation, Profile 5, terminal configuration switching

What are the key requirements of SIST ETS 300 072:2003/A1 E1:2003?

SIST ETS 300 072:2003/A1 E1:2003 updates how Videotex terminals display content, represent multiple scripts, and move between terminal configurations. The practical effect is that implementers need to support the revised layering, character-set handling and configuration control described in the amended clauses and annex.

Display structure

Part 0 replaces the display-structure text so a Videotex terminal uses either the theoretical display structure or the time-dependent display order. The theoretical structure layers alphamosaic foreground and background, photographic content, full-screen background, and then any other video source. The time-dependent model treats the terminal as a one-layer display, where the most recently received VPDE can overlay earlier content.

Character repertoires and code sets

Part 1 extends the alphanumeric repertoire and adds Cyrillic, Arabic, Hebrew and Chinese handling through references to ITU-T Recommendation T.52 and ITU-T Recommendation T.101. It also adds the related code-set headings and designation clauses. In practice, a terminal that claims these capabilities must be able to recognize and switch the relevant character sets correctly.

Bidirectional Latin/Arabic text

Part 1 adds control functions for bidirectional Latin/Arabic text by reference to ITU-T Recommendation T.101. This matters for mixed-script text because the terminal must render the reading order and control effects expected for Latin and Arabic content.

Designation of character sets

Part 1 adds designation clauses for Arabic, Hebrew, Chinese and Cyrillic character sets. These clauses point to the external recommendations for the actual designation rules. For implementers, this means the terminal has to follow the specified set-assignment logic rather than inventing its own mapping.

Annex C terminal states

Annex C expands the service reference model profiles for terminals with Greek, Arabic, Hebrew, Chinese and Cyrillic capabilities. For terminals with Arabic capability, it lists alternative states such as Latin-only, Arabic-only and mixed Latin-Arabic arrangements using G0, G1, G2 and G3 assignments. That is important when a terminal has to move between scripts without losing the right character set in each code position.

Profile 5 and configuration switching

Annex C adds Profile 5 for a service that uses parallel attribute controls and extended format effector controls with the Chinese character set. It also adds a procedure for switching between Videotex terminal configurations using the Terminal Facility Identifier (TFI) exchange defined in ETS 300 076. In practice, a terminal may advertise supported configurations, and the response and switching sequences must follow the referenced configuration format.

What terms does SIST ETS 300 072:2003/A1 E1:2003 define?

PLDS (Presentation Layer Data Syntax) is the data syntax used for the Videotex presentation layer.

VPDE (Videotex Presentation Data Element) is a data element whose order can affect what appears on screen.

Theoretical display structure is the layered display model where different content types are stacked in a defined precedence order.

Time dependent display order is the model where the order of received VPDEs determines the visible order of content.

TFI (Terminal Facility Identifier) is the identifier used to report or request supported terminal configurations in ETS 300 076.

Who uses SIST ETS 300 072:2003/A1 E1:2003?

SIST ETS 300 072:2003/A1 E1:2003 is used by Videotex terminal manufacturers, telecom equipment designers, protocol implementers, and interoperability test labs. It is also relevant to service operators and quality teams that need to verify character-set support, display behavior, and configuration switching in mixed-script Videotex services.

What changed in SIST ETS 300 072:2003/A1 E1:2003 from the previous edition?

SIST ETS 300 072:2003/A1 E1:2003 is Amendment A1 to ETS 300 072 (1990). The amendment adds a second possible display structure, references for Arabic, Hebrew, Chinese and Cyrillic character sets, and a switching mechanism between Videotex terminal configurations. The foreword states that it adds only additional aspects and makes no deletions to ETS 300 072.

Which standards are used with SIST ETS 300 072:2003/A1 E1:2003?

ITU-T Recommendation T.101 provides the interworking basis for videotex services and supplies the references used here for Arabic, Hebrew and Chinese character sets, bidirectional Latin/Arabic controls, and several designation rules.

ITU-T Recommendation T.52 provides the non-Latin coded character-set support used here for the Cyrillic repertoire and Cyrillic designation.

ETS 300 076 provides the Videotex Terminal Facility Identifier (TFI) and the terminal configuration mechanism referenced for switching configurations.

What does the SIST ETS 300 072:2003/A1 E1:2003 document contain?

The document contains amendment text that revises Part 0 and Part 1 of ETS 300 072, inserts abbreviation definitions, and extends Annex C and Appendix A. Its technical content covers display-layer ordering, script repertoires, code-set designation, bidirectional text control, terminal capability states, and TFI-based configuration switching.

It also includes notes and cross-references to ITU-T Recommendation T.101, ITU-T Recommendation T.52 and ETS 300 076 so that implementers can follow the external rules for script handling and terminal configuration.

For testing and implementation work, the most useful parts are the layered display description, the non-Latin character-set clauses, the Annex C profile material, and the configuration-switching procedure.

SLOVENSKI STANDARD
01-december-2003
Terminalska oprema (TE) – Protokol za predstavitveno plast sistema Videotex –
Podatkovna skladnja za predstavitveno plast sistema Videotex
Terminal Equipment (TE); Videotex presentation layer protocol; Videotex presentation
layer data syntax
Ta slovenski standard je istoveten z: ETS 300 072/A1 Edition 1
ICS:
35.100.60 Predstavitveni sloj Presentation layer
35.180 Terminalska in druga IT Terminal and other
periferna oprema IT peripheral equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

ETS 300 072
AMENDMENT A1
October 1996
Source: ETSI TC-TE Reference: RE/TE-01040
ICS: 33.060.50
Key words: Videotex, Videotex data syntax
This amendment A1, will modify
the European Telecommunication Standard ETS 300 072 (1990)
Terminal Equipment (TE);
Videotex presentation layer protocol;
Videotex presentation layer data syntax
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail]
Tel.: [phone] - Fax: [phone]
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1996. All rights reserved.

Page 2
ETS 300 072: November 1990/A1: October 1996
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

Page 3
ETS 300 072: November 1990/A1: October 1996
Foreword
This amendment to ETS 300 072 (1990) has been produced by the Terminal Equipment (TE) Technical
Committee of the European Telecommunications Standards Institute (ETSI).
This amendment to ETS 300 072 specifies the following additional data syntax elements:
- a second possible display structure;
- references to ITU-T Recommendation T.101, annex C for the use of Arabic, Hebrew and Chinese
character sets;
- references to ITU-T Recommendation T.52 for the use of the Cyrillic character set;
- the switching mechanism between Videotex terminal configurations.
The amendment specifies only additional aspects and contains no deletions to the current content of
ETS 300 072.
Transposition dates
Date of adoption of this ETS: 18 October 1996
Date of latest announcement of this ETS (doa): 31 January 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 July 1997
Date of withdrawal of any conflicting National Standard (dow): 31 July 1997
Amendments
Replace Part 0, subclause 1.2.2 (page 4) with the following text:
"1.2.2 Display structure
Videotex terminals shall use either the theoretical display structure (see subclause 1.2.2.1) or the time
dependent display order (see subclause 1.2.2.2).
1.2.2.1 Theoretical display structure
The theoretical sructure of the display consists of the following layers in order of precedence:
- alphamosaic character foreground and background layers (see part 1, section 1.2);
- photographic layer (see part 3);
- full screen background layer (see part 1);
- any other video source.
Changing the display structure is for further study.
1.2.2.2 Time dependent display order
The terminal structure can be regarded as a one layer display. The receiving order of the VPDEs
determines the display order; the last received VPDE, independent from its type, shall always be
processed and can be displayed. It may superimpose already displayed information."

Page 4
ETS 300 072: November 1990/A1: October 1996
Insert the following text in Part 0, clause 2 (page 5) as the 1st paragraph:
"This ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references the last
edition of the publication referred to applies.
ITU-T Recommendation T.101 (1994): "International interworking for videotex services".
ITU-T Recommendation T.52 (1994): "Non-Latin coded character sets for telematic services".
ETS 300 076 (1994): "Terminal Equipment (TE); Videotex Terminal Facility
Identifier (TFI)".
NOTE: The above references are unnumbered in order to align with the original version of
ETS 300 072 which does not exist in electronic format and consequently cannot be
changed without considerable effort.
Insert the following text as part 0, new clause 4:
"4 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
PLDS Presentation Layer Data Syntax
VPDE Videotex Presentation Data Element"
Replace part 1, subclause 2.1.1, 1st paragraph (page 18) with the following text:
"
...