SIST I-ETS 300 763-2 E1:2003

SLOVENSKI STANDARD
SIST I-ETS 300 763-2 E1:2003
01-december-2003
Digitalno omrežje z integriranimi storitvami (ISDN) – Preskušanje znotrajpasovne
signalizacije pri avdiovizualnih storitvah – 2. del: Abstraktni preskušalni niz (ATS)
in dodatna informacija za preskušanje delne izvedbe protokola (PIXIT) – Proforma
specifikacija
Integrated Services Digital Network (ISDN); Audiovisual services in-band signalling
testing; Part 2: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra
Information for Testing (PIXIT) proforma specification
Ta slovenski standard je istoveten z: I-ETS 300 763-2 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
33.160.60 9HþSUHGVWDYQLPXOWLPHGLMVNL Multimedia systems and
VLVWHPLLQRSUHPD]D teleconferencing equipment
WHOHNRQIHUHQFH
SIST I-ETS 300 763-2 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST I-ETS 300 763-2 E1:2003

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SIST I-ETS 300 763-2 E1:2003
INTERIM
EUROPEAN I-ETS 300 763-2
TELECOMMUNICATION November 1997
STANDARD
Source: MTA Reference: DI/MTA-004120-2
Formerly: DI/TE-04120-2
ICS: 33.020
Key words: ATS, audio, inband, ISDN, PIXIT, testing, video
Integrated Services Digital Network (ISDN);
Audiovisual services in-band signalling testing;
Part 2: Abstract Test Suite (ATS) and partial
Protocol Implementation eXtra Information for Testing (PIXIT)
proforma specification
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: secretariat@etsi.fr
Tel.: +33 4 92 94 42 00 - Fax: +33 4 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 1997. All rights reserved.

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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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Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .8
3.1 Definitions .8
3.2 Abbreviations .8
4 Introductory notes.9
4.1 Multiparty testing method.9
4.1.1 Sequencing and control of test components .9
4.2 Diagram of test method and test components.10
4.3 Description of PCOs .10
4.3.1 Description of higher layer PCO - received events .10
4.3.2 Pseudo code description of PCO operation - received events.11
4.3.3 Description of higher layer PCO operation - transmitted events .11
4.4 Naming convention .12
4.5 Audio and video signal content and coding .12
4.6 Description of D-channel activity.13
5 Test Suite Structure.13
5.1 Test Suite Structure - listing of test groups.13
5.2 Test Suite Structure - diagram.15
Annex A (normative): Partial PIXIT proforma.16
Annex B (normative): Abstract Test Suite in TTCN graphical form.17
B.1 The TTCN Graphical form (TTCN.GR) .17
B.2 The TTCN Machine Processable form (TTCN.MP) .17
Annex C (informative): Bibliography.18
History.19

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Foreword
This Interim European Telecommunication Standard (I-ETS) has been produced by the Terminal
Equipment (TE) Technical Committee and approved by Multimedia Terminals and Applications (MTA)
Project of the European Telecommunications Standards Institute (ETSI).
An ETSI standard may be given I-ETS status either because it is regarded as a provisional solution ahead
of a more advanced standard, or because it is immature and requires a "trial period". The life of an I-ETS
is limited to three years after which it can be converted into an ETS, have its life extended for a further two
years, be replaced by a new version, or be withdrawn.
This is part 2 of a multipart standard covering "Integrated Services Digital Network (ISDN); Audiovisual
services in-band signalling testing", as described below:
Part 1: "Test Suite Structure and Test Purpose (TSS & TP) specification";
Part 2: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for
Testing (PIXIT) proforma";
Part 3: "Protocol Implementation Conformance Statement (PICS) proforma specification".
Proposed announcement date
Date of adoption: 24 October 1997
Date of latest announcement of this I-ETS (doa): 28 February 1998

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1 Scope
This Interim European Telecommunication Standard (I-ETS) is part 2 of a three part I-ETS dealing with
conformance testing of Integrated Services Digital Network (ISDN) Videotelephony terminals. Part 1
contains the Test Suite Structure and Test Purposes (TSS & TP) and part 3 contains the Protocol
Implementation Conformance Statement (PICS) proforma.
This I-ETS contains the Abstract Test Suite (ATS) for conformance testing the in-band signalling aspects
of an ISDN Videotelephony terminal which uses one or two B-channels, and which implements the frame
structure and associated syntax as specified in ETS 300 144 [2] and the in-band signalling procedures as
specified in ETS 300 143 [1]. A partial Protocol Implementation eXtra Information for Testing (PIXIT)
Proforma is also included in this I-ETS. No testing of data commands or applications is included among
the tests. Test purposes for signal content of the B-channel are included in part 2 of the I-ETS but no
corresponding test cases have been included. Restricted network operation is outside the scope of this
I-ETS.
It may be possible to use this ATS in order to test a non-ISDN Videotelephony terminal, providing it
provides one or two 64 kbit/s digital channels for transmission. It may also be possible to use the majority
of these test purposes to test in-band signalling implementations according to ETS 300 143 [1] and
ETS 300 144 [2] using single or multiple channels up to 1 920 kbit/s.
2 Normative references
This I-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 I-ETS only when incorporated in it by amendment or revision. For undated references the
latest edition of the publication referred to applies.
[1] ETS 300 143 (1994): "Integrated Services Digital Network (ISDN); Audiovisual
services Inband signalling procedures for audiovisual terminals using digital
channels up to 2 048 kbit/s".
[2] ETS 300 144 (1996): "Integrated Services Digital Network (ISDN); Audiovisual
services, Frame structure for a 64 kbit/s to 1 920 kbit/s channel and associated
syntax for inband signalling".
[3] Reserved.
[4] ISO/IEC 9646 Parts 1 to 7: "Information technology - Open Systems
Interconnection - Conformance testing methodology and framework".
[5] CCITT Recommendation G.711 (1988): "Pulse code modulation (PCM) of voice
frequencies".
[6] CCITT Recommendation G.722 (1988): "7 KHz audio-coding within 64 kbit/s".
[7] Reserved.
[8] Reserved.
[9] ITU-T Recommendation H.261 (1993): "Video codec for audiovisual services at
p x 64 kbit/s".

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3 Definitions and abbreviations
3.1 Definitions
For the purposes of this I-ETS, the following definitions apply:
NOTE: In addition to the definitions shown in this subclause, the definitions in
ISO/IEC 9646 [4] also apply.
additional channel: The second or subsequent channels established in a videophone call.
bit-rate allocation signal: Bit position within the frame structure to transmit commands, control and
indication signals, capabilities.
capability marker; cap marker: The first code in a capability set.
capability set; cap set: A sequence of capability codes started by the capability marker code.
ECS channel: Optional 800 kbit/s channel for use in encryption.
initial channel: The first channel established in a videophone call.
mode 0F: Transmission mode in which the initial channel contains framing, and 7-bit
CCITT Recommendation G.711 [5] audio signal is being transmitted.
mode 0U: Transmission mode in which the initial channel does not contain framing, and 8-bit
CCITT Recommendation G.711 [5] audio signal is being transmitted.
remote terminal: The terminal with which the Implementation Under Test (IUT) is communicating, i.e. the
test tool.
3.2 Abbreviations
For the purposes of this I-ETS, the following abbreviations apply:
ASP Abstract Service Primitive
ATS Abstract Test Suite
BAS Bit rate Allocation Signal
C&I Control and Indication
cap capability
CIF Common Intermediate Format (picture format defined in ITU-T
Recommendation H.261 [9])
CP Coordination Point
CRC Cyclic Redundancy Check
CTP Combined Test Purpose
ECS Encryption Control Signal
FAS Frame Alignment Signal
ISDN Integrated Services Digital Network
IUT Implementation Under Test
LCO Loopback Command "Loop off request"
LSD Low Speed data
MBE Multiple Byte Extension
MCU Multipoint Conference Unit
MLP Multi Layer Protocol
MPI Minimum Picture Interval
MTC Master Test Component
PCO Point of Control and Observation
PDU Protocol Data Unit
PICS Protocol Implementation Conformance Statement
PIXIT Protocol Implementation eXtra Information for Testing
PTC Parallel Test Component

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QCIF Quarter Common Intermidiate Format (picture format defined in
ITU-T Recommendation H.261 [9])
SBE Single Byte Extension
SC Service Channel
TP Test Purpose(s)
TSS Test Suite Structure
TTCN Tree & Tabular Combined Notation
4 Introductory notes
This second part of the multipart I-ETS contains the Abstract Test Suite (ATS) used in conformance
testing of Videotelephony in-band signalling procedures. The corresponding test purposes are defined in
part 1. The test cases are derived from the combined test purposes found in clauses 9 and 10 of part 1. A
PICS proforma, part 3 of this I-ETS, and a partial PIXIT proforma, an annex to this part 2, are referred to
by the ATS.
4.1 Multiparty testing method
This abstract test suite describes the testing specifications for testing in-band signalling in ISDN
Videotelephony terminals using one or two B-channels. Testing activity will take place on the D-channel
(for call control) and on one or both B-channels. Consequently, a multiparty, or concurrent testing method
is necessary.
The test method employed makes use of a Master Test Component (MTC), or controller, and three
Parallel Test Components (PTCs), or slaves: one each for the D-channel and the two B-channels. No
actual testing is performed by the MTC, as all Points of Control and Observation (PCO) are on the PTCs.
Each PTC uses a remote test method in its testing, as described in ISO/IEC 9646 [4].
4.1.1 Sequencing and control of test components
There are communication paths between the MTC and each PTC, and also between the two B-channel
PTCs, for transmission of co-ordination messages during test execution. The MTC handles all scheduling
of test components, with the three PTCs running largely independent of each other. There is therefore a
minimal need for co-ordination messages to be passed between the PTCs and the MTC during a test
case. In a real implementation of this ATS, it may not be possible to have four individual test scripts
running on a test tool; it may therefore be necessary to combine the functions of the MTC and the
D-channel PTC. This should be possible, if some care is taken. Likewise, the actual co-ordination
message contents and the control structure may need to be changed according to test tool
implementation. The final control structure used should not, however, change the sequence of test events
specified in these abstract test cases.
The sequence of events at the start of testing the majority of test cases on one B-channel is as follows:
- all test components start simultaneously;
- B-channel and D-channel test components wait for co-ordination message from MTC;
- MTC sends message to D-channel requesting it to initiate a call;
- D-channel sends message to MTC when B-channel is established and waits for next message;
- MTC sends message to B-channel to cause it to start the test activity;
- MTC waits until B-channel test component has finished executing or a long timer has timed out
(B-channel has crashed);
- MTC sends message to D-channel to request clearing of B-channel;
- MTC waits until D-channel test script has finished.
As can be seen, most of the test cases are started with the B-channels being initiated by the test tool, not
the Implementation Under Test (IUT).

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4.2 Diagram of test method and test components
Figure 1 shows a logical view of the complete configuration of the MTC, PTCs, and PCOs.
The Coordination Point relationships between the various components are also indicated.
TC_Master
MTC
CP_Master_D CP_Master_B1 CP_Master_B2
TC_D TC_B1 TC_B2
PTCs
IUT
CP_B1_B2
B1H B2H
D B1L B2L
PCOs
ASP Filter ASP Filter
D-channel
B-channels
s/t bus
TESTER
Figure 1: Testing configuration
4.3 Description of PCOs
The test method adopted employs separate parallel test components for the D-channel and two
B-channels. Each B-channel test component has two Points of Control and Observation (PCOs). These
are the points at which the IUT's behaviour is visible to the test script running on a test tool.
In ETS 300 143 [1] and ETS 300 144 [2], there is no explicit layered structure for the in-band signalling
protocol. However, there is an implicitly defined structure: a lower layer dealing with frame and multiframe
structure, bit encoding of Bit rate Allocation Signal (BAS) codes and their corresponding
Cyclic Redundancy Check (CRC) codes, bit position of audio, video and data within a frame etc., and a
higher layer dealing with the various sequences and procedures which make use of BAS codes to control
the communication.
4.3.1 Description of higher layer PCO - received events
Sets of BAS codes are passed in Abstract Service Primitives (ASPs), through the higher layer PCO to the
test script running on the tester. As the same BAS command codes are received continuously during
normal operation of in-band signalling, a filtering operation needs to be performed in order to decide which
BAS codes to pass up to the test script in an ASP. Without
...