SIST ETS 300 106 E1:2003

SLOVENSKI STANDARD
01-december-2003
Terminalska oprema (TE) – Mednarodno medsebojno delovanje terminala in
gostitelja pri sistemu Videotex
Terminal Equipment (TE); International Videotex interworking between a terminal and a
host
Ta slovenski standard je istoveten z: ETS 300 106 Edition 1
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 300 106
TELECOMMUNICATION December 1991
STANDARD
Source: TE1 Reference: TE-01021
ICS: 33.020
TE; Videotex
Key words:
Terminal Equipment (TE);
International Videotex Interworking between a terminal
and a host
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 - secretariat@etsi.fr
X.400: Internet:
Tel.: +33 92 94 42 00 - Fax: +33 93 65 47 16
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 1991. All rights reserved.
New presentation - see History box

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ETS 300 106: December 1991
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 300 106: December 1991
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .7
4 Access via PSTN or ISDN bearer service.8
5 Access via PSPDN or ISDN bearer service .8
6 Access via PSPDN through a PAD .8
(2)
7 Access via PSPDN through a VIU .8
8 Access via PSPDN through a VSU .8
8.1 Administrative functions.8
8.1.1 Charging.9
8.1.1.1 Charging level.10
8.1.1.2 Description of charging commands .10
8.1.1.2.1 Charging-Modify-Request.10
8.1.1.2.2 Charging-Modify-Response .10
8.1.1.2.3 Application-Connection-Report.10
8.1.1.2.4 Application-Disconnection-Report .10
8.1.2 Limit handling .11
8.1.2.1 Description of limit handling commands.11
8.1.2.1.1 Cost-Limit-Information-Request.11
8.1.2.1.2 Cost-Limit-Information-Response.11
8.1.2.1.3 Item-Over-Limit.11
8.1.2.1.4 Item-Over-Limit-Response .11
8.1.3 Identification .11
8.1.3.1 Description of Identification commands.12
8.1.3.1.1 Identification-Request .12
8.1.3.1.2 Identification-Response .12
8.1.4 Language-Management .12
8.1.4.1 Language-to-Use-Request .12
8.1.4.2 Language-to-Use-Response .12
8.1.5 Data-Syntax-or-Profile-Management.12
8.1.5.1 Data-Syntax-or-Profile-Switching-Request.12
8.1.5.2 Data-Syntax-or-Profile-Switching-Response .12
8.1.6 Error-Message.12
8.2 Coding.13
Annex A (normative): ASN.1 encoding of the administrative commands of terminal to host
interworking .14
Annex B (informative): State table for charging events received at VSU side .18
B.1 Used abbreviations.18
B.1.1 States.18
B.1.2 Actions .18
B.1.3 Incoming events.18
B.1.4 Outgoing events.19
B.1.5 Predicates.19
B.1.6 Variables.19

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ETS 300 106: December 1991
B.2 State table. 19
B.3 Collision . 20
History. 21

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ETS 300 106: December 1991
Foreword
This European Telecommunication Standard (ETS) has been prepared by the Terminal Equipment (TE)
Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS has been produced in the light of:
a) Videotex services being implemented in different countries using different data syntax profiles (as
described in ETS 300 072 [1]);
b) the International Radio Consultative Committee (CCIR) expressing the view that terminal equipment
1)
compatibility should exist between broadcast Teletext  systems for general reception and public
network-based database systems;
c) the right of different countries to use their existing systems;
d) the possible requirement for transcoding and/or conversion to permit interworking between Videotex
services in different countries;
e) interworking between Videotex services may be provided by using different types of networks such
as the Public Switched Telephone Network (PSTN), Packet Switched Public Data Network
(PSPDN), Circuit Switched Public Data Network (CSPDN), Integrated Services Digital Network
(ISDN), etc;
f) the need for Videotex interworking protocols to offer a large degree of compatibility with those
protocols used in other telematic services.
This ETS provides additional technical information concerning the different configurations of terminal to
host interworking as described in ETS 300 105 [3]. It is closely related to ETS 300 072 [1].

1)
The term "Teletex" has not yet been definitively adopted by the CCIR.

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ETS 300 106: December 1991
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ETS 300 106: December 1991
1 Scope
This ETS describes, where necessary, detailed information on specific points of the different
configurations of Terminal to Host interworking especially in the case of a Videotex Interface Unit (VIU)
and a Videotex Service Unit (VSU).
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] ETS 300 072 (1990): "Terminal equipment (TE); Videotex Presentation Layer
protocol, Videotex presentation layer data syntax (T/TE 06-01)".
[2] ETS 300 076 (1990): "Terminal Equipment (TE); Videotex : Terminal Facility
Identifier (TFI) (T/TE 06-05).
[3] ETS 300 105 (1991): "Terminal equipment (TE); International Videotex
interworking".
[4] CEPT Recommendation T/SF 59: "Videotex Service".
[5] CCITT Recommendation F.300 (1988): "Videotex Service".
[6] CCITT Recommendation X.3 (1988): "Packet assembly/disassembly facility
(PAD) in a public data network".
[7] CCITT Recommendation X.29 (1988): "Procedures for the exchange of control
information and user data between a packet assembly/disassembly (PAD)
facility and a packet mode DTE or another PAD".
[8] CCITT Recommendation X.200 (1988): "Reference model of open systems
interconnection for CCITT applications".
[9] CCITT Recommendation T.541 (1988): "Operational application profile for
videotex interworking".
[10] ISO 639: "Language, country and authority indicatifs".
3 Definitions and abbreviations
The following abbreviations apply:
ASN.1 Abstract Syntax Notation One
CCITT International Telegraph and Telephone Consultative Committee
CCIR International Radiocommunication Consultative Committee
CEPT Conférence Européenne des Postes et Télécommunications
CSPDN Circuit Switched Public Data Network
ETS European Telecommunication Standard
ETSI European Telecommunications Standards Institute
ISDN Integrated Services Digital Network

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ETS 300 106: December 1991
PAD Packet Assembly Disassembly
PDN Public Data Network
PSPDN Packet Switched Public Data Network
PSTN Public Switched Telephone Network
TBC Time Based Charging
VIU Videotex Interface Unit
VSU Videotex Service Unit
4 Access via PSTN or ISDN bearer service
This configuration is described in ETS 300 105 [3], subclause 7.1.
5 Access via PSPDN or ISDN bearer service
This configuration is described in ETS 300 105 [3], subclause 7.2.
6 Access via PSPDN through a PAD
This configuration is described in ETS 300 105 [3], subclause 7.3.
In this configuration it may be necessary to set up the CCITT Recommendation X.3 [6] parameters of the
PAD. This can be done either by the terminal or the host.
(2)
7 Access via PSPDN through a VIU
This configuration is described in ETS 300 105 [3], subclause 7.4.
Cases of CCITT Recommendations X.29 [7] and X.3 [6]:
It may be necessary to set up the CCITT Recommendation X.3 [6] parameters of the VIU. This can be
done either by the terminal or the host.
The data syntax conversion should conform to the one defined in CEPT Recommendation T/SF-59 [4],
section 4.4.
The case of CCITT Recommendation X.200 [8] based protocols is for further study.
8 Access via PSPDN through a VSU
This configuration is described in ETS 300 105 [3], subclause 7.5.
When the connection between the VSU and the host is established a basic communication cost becomes
active.
8.1 Administrative functions
The commands defined in this ETS have been identified in order to allow the exchange of information for
charging and accounting and eventually for identification.
NOTE: The list may not be exhaustive.

2)
Some other networks (CSPDN, ISDN, etc.) may be used between the Terminal and the Host.

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ETS 300 106: December 1991
The following table describes the command, the direction of the command and whether the command
shall be implemented or not in the VSU and/or the host.
Table 1: Terminal to host administrative commands
Direction Implementation at
Command
VSU to Host to VSU Host
Host VSU
Charging-Modify-Request X M O
Charging-Modify-Response X M C
Application-Connection-Report X M O
Application-Disconnection-Report X M O
Cost-Limit-Information-Request X O O
Cost-Limit-Information-Response X C C
Item-Over-Limit X C1 C2
Item-Over-Limit-Response X C1 C2
Identification-Request X O O
Identification-Response X O C
Language-to-Use-Request X O O
Language-to-Use-Response X C O
Data-Syntax-or-Profile-Switching-Request
XO O
Data-Syntax-or-Profile-Switching-Response
XOC
Error-Message X X M M
Key to table 1:
M: mandatory
O: optional
C: mandatory when the related request is implemented
C1: mandatory when Cost-Limit-Information-Request is implemented
C2: mandatory when handling of limits is supported.
8.1.1 Charging
The user in country A who accesses, through a VSU, a host machine in country B shall be charged for the
session according to a bilateral agreed charging level (initial charging level). The host in country B may
adjust the charging level by changing TBC-rate (Time-Based-Charging-rate) and/or Volume-rate. In
addition, the host may charge the user for items accessed (frame price) and transactions performed
(transaction price).
TBC-rate is specified in terms of period and price per period. Volume-rate is specified in terms of volume
size and price per volume. All data sent and received by the VSU on the host side shall be taken into
account.
All costs shall be expressed in the currency of the country of the host.
As state tables can be seen as a way of describing the interaction of protocol events, the state table for
the charging commands received by the VSU is given in Annex B.

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ETS 300 106: December 1991
8.1.1.1 Charging level
For negotiation of charging level the commands Charging-Modify-Request and Charging-Modify-Res-
ponse shall be used.
Application-Connection-Report is used to indicate the moment in time that the negotiated charging level
becomes active.
The host may announce an Application-Connection-Report by a parameter in the Charging-Modify-
Request. If such a parameter announces start at connection report, the VSU shall delay the use of the
new charging level until it has received the Application-Connection-Report. When the host has not
announced the Application-Connection-Report, the VSU shall activate the new charging level upon receipt
of an Application-Connection-Report command or any data packet with the Q bit set to zero.
Application-Disconnection-Report is used to reset the charging level either to the still running charging
level or to the bilateral agreed charging level (initial charging level).
8.1.1.2 Description of charging commands
8.1.1.2.1 Charging-Modify-Request
This command is sent by the host to the VSU. It contains information about modifications in communi-
cation costs (TBC-rate and volume-rate ) and/or application costs (TBC-rate, volume-rate, frame-price
and transaction-price).
At least one modification shall be present when the command is used.
This command shall be sent whenever the charging changes and shall alway
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