SIST ETS 300 076 E2:2003

• Abstract:

  Enhanced version of 1990 published ETS

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.160.99 - Other audio, video and audiovisual equipment
• 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 300 076 ed.2 (1992-08) - Terminal Equipment (TE); Videotex Terminal Facility Identifier (TFI)

SIST ETS 300 076 E2:2003 is the Slovenian adoption of ETS 300 076 Edition 2 from ETSI. It specifies the Videotex Terminal Facility Identifier (TFI), a coding scheme used by Videotex services and terminals to exchange capability information.

The standard tells a Videotex host computer what a terminal can support, including data syntax, profile, audio, modem, photographic and language-related capabilities. It is intended for Videotex services, attached Videotex terminals, and other equipment such as another Videotex service when it acts as a terminal.

What does SIST ETS 300 076 E2:2003 specify?

SIST ETS 300 076 E2:2003 specifies the data syntax used by Videotex services for terminal-capability identification. It applies to Videotex services and attached Videotex terminals connected through the Public Switched Telephone Network (PSTN) or the Integrated Services Digital Network (ISDN), and it also applies to equipment that behaves as a Videotex terminal.

The document is organized into:

• Scope
• Normative references
• Definitions
• Symbols and abbreviations
• Overview
• Coding
• Defaults
• Formal description of the terminal response

Clause 6 is the core of the standard. It divides the coding rules into compatibility with CCITT Recommendation T.101, Service Reference Model conformance, profiles and non-Latin language capabilities, audio capabilities, modem capability, photographic capabilities, the terminal configuration delimiter, and non-Latin language capability.

What are the key requirements of SIST ETS 300 076 E2:2003?

The terminal must answer a capability request in a defined byte sequence

Clause 6 defines the exchange: the host sends the identification command US 2/0 4/0, and the terminal responds with US 2/0 followed by the capability codes and a final terminator. In practice, this gives the host a machine-readable way to discover what the terminal can handle before sending content.

Multi-syntax systems should follow CCITT Recommendation T.101

Clause 6.1 says implementations intended for systems with more than one data syntax should be based on CCITT Recommendation T.101. In that case, the DS II profile identification codes are inserted between the profile markers, and 5/6 indicates support of ISO 9281 switching. This matters when one terminal must interwork across multiple Videotex coding environments.

Service Reference Model conformance is coded for compatibility

Clause 6.2 assigns codes for parts of the Service Reference Model (SRM), such as Alphamosaic, Geometric, Transparent data, Processable data, define colour, define format, reset and timing control. The clause is kept for compatibility with existing systems, so a host can still recognize which presentation-layer functions a terminal supports.

Profiles and logical configurations can be combined

Clause 6.3 assigns codes for alpha-mosaic profiles, geometric profiles, ASCII profile introducers, photographic profile use, and non-Latin language capability. It also defines the non-final capability byte indicator and the terminal configuration delimiter. In practice, this lets one physical terminal advertise several logical configurations, several profiles for the same display mode, or extra features such as telesoftware, transparent mode, 80 character capability and chipcard capability.

Audio capability, modem capability and photographic capability are identified separately

Clauses 6.4 to 6.6 describe how a terminal reports media and connection support.

• Audio responses identify whether the terminal uses block mode or framing, then name the audio algorithm and bitrate.
• Modem responses identify asynchronous, synchronous, or error-correcting/compressing operation, then state the supported modem speeds and related mechanisms.
• Photographic responses identify the photographic profile and whether the display is monochrome or colour.

This is important because the host can only choose media and transmission settings that the terminal has explicitly declared.

A single terminal may present several logical terminals

Clause 6.7 says the terminal configuration delimiter separates logical terminals within one physical terminal. A service may receive a list of configurations, each with its own profile and capability set. This is useful when one device behaves differently in different user modes.

Non-Latin language support is tied to the relevant profile

Clause 6.8 uses codes in the range 7/3 to 7/7 for non-Latin language capability. An alphamosaic profile code is immediately followed by one language code when that profile is to be used with Greek, Arabic, Chinese, Hebrew or Cyrillic text. This makes language-specific display support explicit instead of relying on assumptions.

The document defines a fallback if the terminal does not answer

Clause 7 says that if no response is received in time, the basic terminal for that network is assumed. That gives the service a defined default behavior instead of leaving the connection undecided.

The response syntax is formally defined for implementation and parsing

Clause 8 gives a grammar for the TFI response, including the allowed response forms, capability byte sequences, terminators and profile combinations. This is the part developers and test labs use when they need to parse or validate a terminal response exactly.

What terms does SIST ETS 300 076 E2:2003 define?

• Capability - A coding method described by the Videotex data syntax and supported by a given Videotex terminal.
• Data syntax - The Videotex coding technique defined by CCITT Recommendation T.101.
• Facility - Another term used for capability in this document.
• Profile - A consistent subset of the Service Reference Model.
• Service Reference Model (SRM) - The list of functionalities a terminal should comply with.
• Terminal Facility Identifier (TFI) - The capability-identification mechanism specified by the standard.
• Videotex Host Computer - The host side that queries a terminal for its capabilities.

Who uses SIST ETS 300 076 E2:2003?

Videotex service providers use this standard to query terminals and decide which content, media and connection options to use. Terminal manufacturers and software developers use it to encode the capabilities of a physical terminal or a service acting as a terminal.

Network and integration engineers use it when Videotex terminals are connected through PSTN or ISDN. Test laboratories and quality teams use the coding rules and the formal grammar to check that a response is formed correctly.

What changed in SIST ETS 300 076 E2:2003 from the previous edition?

This second edition supersedes the 1990 version of ETS 300 076. It takes into account the photographic syntax described in ETS 300 177 and the audio syntax described in ETS 300 149.

Which standards are used with SIST ETS 300 076 E2:2003?

Reference	What it contributes
CCITT Recommendation F.300	The Videotex service model and the term Videotex Host Computer.
CCITT Recommendation T.100	International information exchange for interactive Videotex.
CCITT Recommendation T.101	The interworking basis for Videotex data syntax and multi-syntax responses.
ETS 300 072	Base Videotex presentation-layer protocol and alpha-mosaic related functions.
ETS 300 073	Geometric display coding.
ETS 300 074	Transparent data coding.
ETS 300 075	Processable data coding.
ETS 300 177	Photographic syntax and compatible photographic profiles.
ETS 300 149	Audio syntax.
G.711, G.721, G.722, G.723, J.41, J.42, I-ETS 300 036, ISO CD 11172-3	Audio algorithms and bitrate coding used in audio capability responses.
V.21, V.22, V.22 bis, V.23, V.26 bis, V.26 ter, V.27 ter, V.29, V.32, V.33, V.17, V.42, V.42 bis	Modem types, error correction and data compression codes.
H.221	Framing for audio capability signaling.

What does the SIST ETS 300 076 E2:2003 document contain?

Clause 6 contains the code tables that map capability bytes to profile, audio, modem, photographic and language declarations. It also includes worked examples showing how single and multi-configuration responses are built.

Clause 8 contains the formal grammar for the TFI response. That grammar is what implementers and test labs use when they need to check response syntax, ordering and termination.

SLOVENSKI STANDARD
01-december-2003
Terminalska oprema (TE) – Identifikator terminalskih zmožnosti sistema Videotex
(TFI)
Terminal Equipment (TE); Videotex Terminal Facility Identifier (TFI)
Ta slovenski standard je istoveten z: ETS 300 076 Edition 2
ICS:
33.160.99 Druga avdio, video in Other audio, video and
avdiovizuelna oprema audiovisual equipment
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.

EUROPEAN ETS 300 076
TELECOMMUNICATION August 1992
STANDARD Second Edition
Source: ETSI TC-TE Reference: DE/TE-01005
ICS: 33.020, 33.040.40
Videotex
Key words:
Terminal Equipment (TE);
Videotex
Terminal Facility Identifier (TFI)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - [e-mail]
X.400: Internet:
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 1992. All rights reserved.
New presentation - see History box

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ETS 300 076: August 1992
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.

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ETS 300 076: August 1992
Contents
Foreword.5
Introduction .5
1 Scope .7
2 Normative references .7
3 Definitions.9
4 Symbols and abbreviations.9
5 Overview .10
6 Coding.10
6.1 Compatibility provision for CCITT Recommendation T.101.11
6.2 Conformance to the SRM .11
6.3 Profiles and non-Latin language capabilities. 11
6.4 Audio capabilities .14
6.5 Modem capability.15
6.6 Photographic capabilities .16
6.7 Terminal configuration delimiter .17
6.8 Non-Latin language capability.17
7 Defaults.18
8 Formal description of the terminal response .18
8.1 Introduction.18
8.2 Notation used.18
8.3 Formal description of the terminal response .18
History.21

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ETS 300 076: August 1992
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ETS 300 076: August 1992
Foreword
This second edition of ETS 300 076 has been prepared by the Terminal Equipment (TE) Technical
Committee of the European Telecommunications Standards Institute (ETSI).
This edition supersedes the 1990 version of this ETS which was adopted in Autumn 1990. It takes into
account the introduction of both the photographic and the audio syntax described in ETS 300 177 [8] and
ETS 300 149 [9] respectively.
This ETS describes the Terminal Facility Identifier (TFI) which may be used to ascertain the capabilities of
either a physical Videotex terminal or another Videotex service. This ETS is one of an integrated package
of 7 ETSs covering various aspects of Videotex which comprises:
ETS 300 072 Terminal Equipment (TE);
Videotex presentation layer protocol
Videotex presentation layer data syntax
ETS 300 073 Videotex presentation layer data syntax;
Geometric display
(CEPT Recommendation T/TE 06-02, Edinburgh 1988)
ETS 300 074 Videotex presentation layer data syntax transparent data;
(CEPT Recommendation T/TE 06-03, Edinburgh 1988)
ETS 300 075 Terminal Equipment (TE);
Videotex processable data
ETS 300 177 Terminal Equipment (TE);
Videotex
Photographic Syntax
ETS 300 149 Terminal Equipment (TE);
Videotex
Audio syntax
Introduction
The Terminal Facility Identifier (TFI) may be used to ascertain the capabilities of a "terminal" (where a
terminal may actually be a physical terminal or another Videotex service). Videotex terminals have not all
been designed to support all coding techniques; for example, photographic and audio, or support of
different types of local facilities such as telesoftware or various types of modems. In addition, a specific
terminal may support one or more of the defined base data syntaxes DS I, DS II or DS III. The TFI may be
used to determine:
- each of the national or regional Videotex services;
- the terminal profile and additional terminal capabilities;
- to which parts of the Service Reference Model (SRM) the terminal conforms.

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ETS 300 076: August 1992
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ETS 300 076: August 1992
1 Scope
This European Telecommunication Standard (ETS) specifies the data syntax to be used by Videotex
services for terminal capabilities identification.
This ETS is applicable to both the Videotex service and the attached Videotex terminals. Those terminals
may be connected to the Videotex service via the Public Switched Telephone Network (PSTN) or the
Integrated Services Digital Network (ISDN). Connection of terminals to other networks is for further study.
It also applies to any equipment (e.g. another Videotex service) which acts as a Videotex terminal.
2 Normative references
This ETS incorporates by dated or 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 latest edition of the
publication referred to applies.
[1] CCITT Recommendation F.300 (1988): "Videotex service".
[2] CCITT Recommendation T.100 (1988): "International information exchange for
interactive videotex".
[3] CCITT Recommendation T.101 (1988): "International interworking for videotex".
[4] ETS 300 072 (1990): "Terminal Equipment (TE); Videotex presentation layer
protocol, Videotex presentation layer data syntax".
[5] ETS 300 073 (1990): "Videotex presentation layer protocol; Geometric Display
(CEPT Recommendation T/TE 06-02, Edinburgh 1988)".
[6] ETS 300 074 (1990): "Videotex presentation layer protocol; Transparent data
(CEPT Recommendation T/TE 06-03, Edinburgh 1988)".
[7] ETS 300 075 (1990): "Terminal Equipment (TE); Videotex processable data".
[8] ETS 300 177: "Terminal Equipment (TE); Videotex, Photographic syntax".
[9] ETS 300 149: "Terminal Equipment (TE); Videotex, Audio syntax".
[10] CCITT Recommendation G.711 (1988): "Pulse Code Modulation of voice
frequencies".
[11] CCITT Recommendation G.721 (1988): "32 kbit/s adaptive differential pulse
code modulation (ADPCM)".
[12] CCITT Recommendation G.722 (1988): "7 kHz audio-coding within 64 kbit/s".
[13] CCITT Recommendation G.723 (1988): "Extensions of Recommendation G.721
adaptive differential pulse code modulation to 20 and 40 kbit/s for digital circuit
multiplication equipment application".
[14] CCITT Recommendation J.41 (1988): "Characteristics of equipment for the
coding of analogue high quality sound programme signals for transmission on
384 kbit/s channels".
[15] CCITT Recommendation J.42 (1988): "Characteristics of equipment for the
coding of analogue medium quality sound programme signals for transmission on
384-kbit/s channels".
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ETS 300 076: August 1992
[16] I-ETS 300 036: "European digital cellular telecommunications system (phase 1);
Full-rate speech transcoding (GSM 06.10)".
[17] CCITT Recommendation V.21 (1988): "300 bits per second duplex modem
standardised for use in the general switched telephone network".
[18] CCITT Recommendation V.22 (1988): "1200 bits per second duplex modem
standardised for use in the general switched telephone network and on point-to-
point 2-wire leased telephone-type circuits".
[19] CCITT Recommendation V.22 bis (1988): "2400 bits per second duplex modem
using the frequency division technique standardised for use on the general
switched telephone network and on point-to-point 2-wire leased telephone-type
circuits".
[20] CCITT Recommendation V.23 (1988): "600/1200 bits per second modem
standardised for use in the general switched telephone network".
[21] CCITT Recommendation V.26 bis (1988): "2400/1200 bits per second modem
standardised for use in the general switched telephone network".
[22] CCITT Recommendation V.26 ter (1988): "2400 bits per second duplex modem
using the echo cancellation technique standardised for use on the general
switched telephone network and on point-to-point 2-wire leased telephone-type
circuits".
[23] CCITT Recommendation V.27 ter (1988): "4800/2400 bits per second modem
standardised for use in the general switched telephone network".
[24] CCITT Recommendation V.29 (1988): "9600 bits per second modem
standardised for use on point-to-point 4-wire leased telephone-type circuits".
[25] CCITT Recommendation V.32 (1988): "A family of 2-wire, duplex modems
operating at data signalling rates of up to 9600 bit/s for use on the general
switched telephone network and on leased telephone-type circuits".
[26] CCITT Recommendation V.33 (1988): "14 400 bits per second modem
standardised for use on point-to-point 4-wire leased telephone-type circuits".
[27] CCITT Recommendation V.17 (1990): "Recommendation for a 2-wire modem for
facsimile applications with rates up to 14 400 bit/s".
[28] CCITT Recommendation H.221 (1988): "Frame structure of a 64 kbit/s channel
in audio-visual teleservices".
[29] CCITT Recommendation V.42 (1988): "Error correcting procedures for DCEs
using asynchronous to synchronous conversion".
[30] CCITT Recommendation V.42 bis (1990): "Data compression procedures for
data circuit-terminating equipment (DCE) using error correcting procedures".
[31] ISO CD 11172-3: "Coding of moving pictures and associated audio for digital
storage media at up to about 1,5 Mbit/s - Audio part".

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ETS 300 076: August 1992
3 Definitions
For the purpose of this ETS, the following definitions apply.
Capability: coding method described by the Videotex data syntax and supported by a given Videotex
terminal.
Data syntax: Videotex coding technique as described in CCITT Recommendation T.101 [3].
Facility: see "Capability".
Profile: consistent subset of the Service Reference Model.
Service Reference Model: list of functionalities a terminal should comply with.
Videotex Host Computer: refer to CCITT Recommendation F.300 [1].
4 Symbols and abbreviations
For the purpose of this ETS, the following symbols and abbreviations apply.
DRCS Dynamically Redefinable Character Set
DS I Data Syntax according to CCITT Recommendation T.101 [3], Annex B
DS II Data Syntax according to CCITT Recommendation T.101 [3], Annex C
DS III Data Syntax according to CCITT Recommendation T.101 [3], Annex D
ETS European Telecommunication Standard
ETSI European Telecommunications Standards Institute
ISDN Integrated Services Digital Network
PSTN Public Switched Telephone Network
PDE Presentation Data Element
SRM Service Reference Model
TFI Terminal Facility Identifier
US Unit Separator
VPCE Videotex Presentation Control Element
VPDE Videotex Presentation Data Element

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ETS 300 076: August 1992
5 Overview
The Videotex data syntax allows for the use of a variety of different coding techniques (text, mosaics,
graphics, audio, photographic pictures, etc.).
The Videotex terminals have not all been designed to support all the possible coding techniques; some of
them are unable to display graphic or photographic images, to output audio information. Some others
partly support such facilities. Some facilities are grouped together in order to establish a so called
"Videotex profile" which represents a coherent and consistent set of functionalities and, therefore, is
intended to be supported by a large population of terminals.
In addition, terminals may be connected to different networks, use different modems, etc.
To maximise the chance of successful communication, the Videotex host computer may ask the terminal
about the capabilities it supports.
The terminal may answer indicating:
- either the data syntax and the profile(s);
- or the precise list of facilities it supports.
The coding is described in Clause 6 below and the formal description of the terminal response is given in
Clause 8.
6 Coding
To request the terminal profile, the code US 2/0 4/0 is transmitted to the terminal.
The terminal shall reply with US 2/0 followed by a series of bytes from columns 4 to 7 of the code table
and terminating with the code 4/0 except in some cases when the Escape code (7/15) is used (see
subclause 6.3).
Host Terminal
.... Identification Command: US 2/0 4/0 - - - - - - - - - >
<- - - - US 2/0 x/y.x/y Z; TFI response.
Intermediate codes x/y shall be transmitted by the terminal between US 2/0 and the final code Z. The value
of the final code Z is described in subclause 6.3. Intermediate codes identify the capabilities of the terminal
and shall be selected from the following list:
4/1 - 4/15 = reserved for internal use of each data syntaxes DS I, DS II and DS III (DS II is
defined by this ETS)
5/0, 5/1 = audio mode (as defined in subclause 6.4)
5/2 = modem capability (as defined in subclause 6.5)
5/3 = reserved
5/4 = data syntax and profile (rank/facility) identification:
3/1 = DS I
3/2 = DS II
3/3 = DS III
3/4 to 3/13 = reserved
3/14 = private
3/15 = termination code
5/5 = photographic mode (as defined in subclause 6.6)
5/6 = support of ISO 9281 switching
5/7 - 5/15 = reserved
6/0 - 7/15 = reserved for internal use of each data syntax DS I, DS II and DS III.

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ETS 300 076: August 1992
The values in the range 4/1 - 4/15 and 6/0 - 7/15 terminated by the code 3/15 are used for the profile
identification. The codes following a particular data syntax identification pertain to that particular data
syntax.
6.1 Compatibility provision for CCITT Recommendation T.101
Terminal Facility Identifier (TFI) implementations of terminals which are intended to be used in systems
where more than one data syntax is in use, should be based on CCITT Recommendation T.101 [3]. In that
case, the profile identification of data syntax II (4/1 - 4/15 and 6/0 - 7/15) are included between the codes
5/4, 3/2 and 3/15. The code 5/6 indicates the support of ISO 9281 switching. The end of the TFI response
is indicated by the value 4/0 only and not by the last capability byte (see subclause 6.3). The detailed
description is contained in CCITT Recommendation T.101 [3], § 9.2.
6.2 Conformance to the SRM
NOTE: This subclause is present within this ETS only to maintain compatibility with existing
systems.
The following codes have been assigned for identifying parts of the SRM.
4/0 Terminator
4/1 Alphamosaic (ETS 300 072 [4])
4/2 Geometric (ETS 300 073 [5])
4/3 Photographic (ETS 300 072 [4] - and for ETS 300 177 [8])
4/4 Define DRCS (ETS 300 072 [4])
4/5 Define colour (ETS 300 072 [4])
4/6 Define format (ETS 300 072 [4])
4/7 Transparent data (ETS 300 074 [6])
4/8 Reset (ETS 300 072 [4])
4/9 Processable data (ETS 300 075 [7])
4/11 Timing control (ETS 300 072 [4])
EXAMPLE: A terminal conforming to the following parts of the SRM: Alpha-mosaic, Define
DRCS, Define colour, Define format, Reset shall transmit:
US 2/0, 4/1, 4/4, 4/5, 4/6, 4/8, 4/0.
If different levels of conformance are defined in the future (as for the Geometric display or Processable
data) then the level of conformance
...