SIST EN 300 267-4 V1.2.4:2005

• Abstract:

  ATS for REN/SPS-050112-1

• Status: Published
• Publication Date: 31-Mar-2005
• ICS: 33.080 - Integrated Services Digital Network (ISDN)
• Technical Committee: SPN - Services and Protocols for Networks
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Apr-2005
• Due Date: 01-Apr-2005
• Completion Date: 01-Apr-2005
• Ref Project: ETSI EN 300 267-4 V1.2.4 (2000-06) - Integrated Services Digital Network (ISDN); Telephony 7 kHz, videotelephony, audiographic conference and videoconference teleservices; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 4: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the user

SIST EN 300 267-4 V1.2.4:2005 is the Slovenian adoption of ETSI EN 300 267-4 V1.2.4. It specifies an Abstract Test Suite (ATS) and a partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma for user-side implementations of the Digital Subscriber Signalling System No. one (DSS1) protocol in ISDN telephony 7 kHz, videotelephony, audiographic conference and videoconference teleservices. The document is intended for test laboratories, test realisers and implementers who need to prepare, run and report conformance tests at the T reference point or coincident S and T reference point.

What does SIST EN 300 267-4 V1.2.4:2005 specify?

SIST EN 300 267-4 V1.2.4:2005 specifies the test material for the user side of the ISDN teleservices covered by EN 300 267-1. The standard focuses on how to test the DSS1 protocol support needed for telephony 7 kHz, videotelephony, audiographic conference and videoconference services, and it is part 4 of a multi-part series.

The document is organized into clauses 1 to 11 and four annexes. Clauses 1 to 4 set out the scope, references, definitions and introduction; clauses 5 to 8 define the abstract test method, naming rules, test-suite conventions and the ATS-to-TP map; clauses 9 to 11 define conformance for the PCTR, PIXIT and ATS.

Annex	What it covers
Annex A	Normative Protocol Conformance Test Report (PCTR) proforma
Annex B	Normative partial PIXIT proforma
Annex C	Normative Abstract Test Suite (ATS)
Annex D	Informative general structure of an ATS

What are the key requirements of SIST EN 300 267-4 V1.2.4:2005?

The standard is built around a remote, concurrent, multi-party test method. Clause 5.1 says testing takes place on the D-channel and on one or two B-channels, with a Main Test Component (MTC) and one or two Parallel Test Components (PTCs). In practice, that means a test bench must coordinate several test components at once, because the service can use multiple channels together.

Test method and channel handling

Clause 5.3.1 places the D-channel Point of Control and Observation (PCO) at the service access point between layers 2 and 3, named DL. The same Abstract Service Primitives (ASPs) as EN 300 403-5 are used there, so the D-channel part of the ATS follows the same observation style as the basic call control test material.

Clause 5.3.2 treats the B-channel differently because in-band signalling has no explicit layered structure. The lower-layer declarations are reused from I-ETS 300 763-2, and the ATS references higher-layer test steps from that work when it needs to describe behaviour that is hard to express at the lower layer. For readers, this means the ATS checks signalling control and framing behaviour, not audio or video payload content.

Clause 5.3.2 also states that audio and video signal contents in frames and multiframes are ignored, and that audio encoding/decoding is out of scope. The ATS includes a procedure for detecting incorrect CRC4, which matters where the tester implements CRC4 checking and needs to confirm bad bit patterns.

Test case structure and naming

Clause 5.4.1 gives a one-to-one relation between test cases and combined test purposes, with names that reuse the combined TP identifiers. The prefixes CT, CV, CA and CC identify telephony 7 kHz, videotelephony, audiographic conference and videoconference cases, so the name itself tells you which service family and requirement set is under test.

Clause 6 marks generic protocol requirements as untestable. That matters because the ATS is meant to cover testable behaviour only, while generic supporting parts of EN 300 267-1 are handled as background rather than as separate test cases.

Clause 7.3 says each test case contains a purpose, comments, references to EN 300 267-1, a description linked to EN 300 267-3, and a behaviour description with a main tree for the MTC. When B-channel behaviour is relevant, the test case uses test steps, which lets a tester ignore those steps if B-channel testing is not implemented.

Clause 7.3.3 uses the RETURN statement for default handling, and clause 7.3.4 defines co-ordination messages between the MTC and PTCs. In practice, this is what keeps concurrent test execution synchronized, especially when a second B-channel is added during a call.

Data definitions and access configuration

Clause 7.1.5 defines the ASSIGN_CHI operation to select the correct Channel identification information element for basic or primary access. This avoids duplicate types and duplicate test cases, so one ATS can adapt to both access types without splitting into separate suites.

Annex B turns the test setup into a partial PIXIT proforma. It collects the supported configuration, the actions needed to stimulate the IUT, timer values and parameter values. For a user of the standard, that is the part that turns the abstract test suite into a test-ready setup for a specific implementation.

Conformance rules

Clauses 9 to 11 define how PCTR, PIXIT and ATS conformance are handled. A PCTR that conforms to this standard must preserve the content and ordering of Annex A, and a conforming partial PIXIT must be technically equivalent to Annex B. For the ATS itself, the executable test suite and the Means Of Testing (MOT) have to be technically equivalent to Annex C, and all abstract test-case event sequences must be realizable.

What terms does SIST EN 300 267-4 V1.2.4:2005 define?

• Abstract Test Suite (ATS) - the TTCN-based set of abstract test cases in Annex C.
• Protocol Implementation eXtra Information for Testing (PIXIT) - the implementation-specific information needed to adapt the tests to a particular system.
• Protocol Conformance Test Report (PCTR) - the report template in Annex A used to record test results and conformance status.
• Implementation Under Test (IUT) - the protocol implementation being checked against EN 300 267-1.
• Main Test Component (MTC) - the component that coordinates the test run and assigns the final verdict.
• Parallel Test Component (PTC) - a concurrent test component used, here, for B-channel activity.
• Point of Control and Observation (PCO) - the interface point where the tester controls and observes the IUT.
• Test Purpose (TP) - the individual conformance objective that the ATS test cases are mapped to.

Who uses SIST EN 300 267-4 V1.2.4:2005?

SIST EN 300 267-4 V1.2.4:2005 is used by test laboratories that run conformance tests and produce PCTR and PIXIT documents. It is also used by test realisers who build executable test suites and Means Of Testing from the ATS in Annex C.

Implementers of ISDN user-side equipment use it to check whether their DSS1 behaviour matches the user-side protocol requirements for the supported teleservices. Buyers, quality managers and certification teams use it when they need a structured way to ask for, run or review conformance evidence for the user side of the T reference point.

Which standards are used with SIST EN 300 267-4 V1.2.4:2005?

Standard	What it contributes
EN 300 267-1	The protocol specification that this ATS tests
EN 300 267-2	The PICS proforma used for static conformance information
EN 300 267-3	The user-side Test Suite Structure and Test Purposes linked to this ATS
EN 300 267-5	The network-side TSS&TP for the same family of teleservices
EN 300 267-6	The network-side ATS and partial PIXIT proforma
EN 300 403-1	Basic call control behaviour used in the test design
EN 300 403-5	D-channel ATS material reused for the lower-layer handling
I-ETS 300 763-2	In-band signalling test material reused for B-channel lower-layer behaviour
ISO/IEC 9646-1 to 5	Conformance testing methodology, TTCN, test realization and test-laboratory requirements
ITU-T Recommendation I.411	Reference configurations for the T and S/T reference points

What does the SIST EN 300 267-4 V1.2.4:2005 document contain?

Annex C contains the ATS itself in TTCN graphical form and machine-processable form. Clause 7 describes the TTCN declarations, constraints and dynamic behaviour conventions that underpin those test cases, while Annex D gives the general structure of an ATS as a reading aid.

Annex A gives a full PCTR proforma with identification, conformance status, static and dynamic summaries, campaign reporting and observations. Annex B gives the partial PIXIT proforma, including configuration questions, stimulus actions, timers and parameter values needed to prepare a specific test run.

Together, these parts let a laboratory move from abstract conformance objectives to a concrete test setup, a recorded report and an executable suite built to the same structure.

SLOVENSKI STANDARD
01-april-2005
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Integrated Services Digital Network (ISDN); Telephony 7 kHz, videotelephony,
audiographic conference and videoconference teleservices; Digital Subscriber Signalling
System No. one (DSS1) protocol; Part 4: Abstract Test Suite (ATS) and partial Protocol
Implementation eXtra Information for Testing (PIXIT) proforma specification for the user
Ta slovenski standard je istoveten z: EN 300 267-4 Version 1.2.4
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

European Standard (Telecommunications series)
Integrated Services Digital Network (ISDN);
Telephony 7 kHz, videotelephony, audiographic conference
and videoconference teleservices;
Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 4: Abstract Test Suite (ATS) and partial Protocol
Implementation eXtra Information for Testing (PIXIT)
proforma specification for the user


2 ETSI EN 300 267-4 V1.2.4 (2000-06)
Reference
REN/SPS-05112-4
Keywords
7kHz, ATS, audio, conf, DSS1, ISDN, PIXIT,
telephony, teleservice, user, video
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ETSI
3 ETSI EN 300 267-4 V1.2.4 (2000-06)
Contents
Intellectual Property Rights.5
Foreword .5
1 Scope.6
2 References.6
3 Definitions and abbreviations .7
3.1 Definitions.7
3.2 Abbreviations.7
4 Introduction.8
5 Abstract Test Method (ATM) .8
5.1 Description of ATM used.8
5.2 Conventions for test components and PCOs .9
5.3 Description of PCOs .9
5.3.1 D-channel PCO.9
5.3.2 B-channels PCOs.10
5.4 Naming conventions.10
5.4.1 Test cases .10
5.4.2 Variables and parameters .11
5.4.3 Trees and subtrees .11
6 Untestable test purposes.11
7 ATS conventions.12
7.1 Declarations part .12
7.1.1 Type definitions.12
7.1.1.1 Simple type definitions.12
7.1.1.2 Structured type definitions.12
7.1.1.2.1 TTCN structured type definitions .12
7.1.1.2.2 ASN.1 structured type definitions.12
7.1.1.3 ASP type definitions.12
7.1.1.3.1 TTCN ASP type definitions.12
7.1.1.3.2 ASN.1 ASP type definitions .13
7.1.1.4 PDU type definitions .13
7.1.1.4.1 TTCN PDU type definitions .13
7.1.1.4.2 ASN.1 PDU type definitions.13
7.1.2 Test suite constants.13
7.1.3 Test suite parameters .13
7.1.4 Variables .14
7.1.4.1 Test suite variables .14
7.1.4.2 Test case variables.14
7.1.5 Test suite operation definitions.14
7.2 Constraints part .15
7.2.1 Structured type constraint declaration .15
7.2.2 ASN.1 type constraint declaration.15
7.2.3 ASP type constraint declaration .15
7.2.3.1 ASN.1 ASP type constraint declaration.15
7.2.3.2 TTCN ASP type constraint declaration .15
7.2.4 PDU type constraint declaration.15
7.2.4.1 ASN.1 PDU type constraint declaration.15
7.2.4.2 TTCN PDU type constraint declaration .15
7.2.5 Derived constraints.15
7.2.6 Parameterized constraints.15
7.2.7 Value assignment.16
7.2.7.1 Specific values.16
7.2.7.2 Matching values.16
ETSI
4 ETSI EN 300 267-4 V1.2.4 (2000-06)
7.3 Dynamic part.16
7.3.1 Test cases .16
7.3.2 Test steps.16
7.3.3 Defaults .16
7.3.4 Synchronization.17
8 ATS to TP map.19
9 PCTR conformance.19
10 PIXIT conformance.19
11 ATS conformance .19
Annex A (normative): Protocol Conformance Test Report (PCTR) proforma.20
A.1 Identification summary .20
A.1.1 Protocol conformance test report.20
A.1.2 IUT identification.20
A.1.3 Testing environment.20
A.1.4 Limits and reservations.21
A.1.5 Comments.21
A.2 IUT Conformance status .21
A.3 Static conformance summary.21
A.4 Dynamic conformance summary.22
A.5 Static conformance review report .22
A.6 Test campaign report.23
A.7 Observations.25
Annex B (normative): Partial PIXIT proforma.26
B.1 Identification summary .26
B.2 Abstract test suite summary .26
B.3 Test laboratory .26
B.4 Client (of the test laboratory).27
B.5 System Under Test (SUT).27
B.6 Protocol information .28
B.6.1 Protocol identification .28
B.6.2 Configuration to be tested .28
B.6.3 Actions required to stimulate IUT .29
B.6.4 Test management timers.29
B.6.5 Parameter values.30
Annex C (normative): Abstract Test Suite (ATS).31
C.1 The TTCN Graphical form (TTCN.GR).31
C.2 The TTCN Machine Processable form (TTCN.MP) .31
Annex D (informative): General structure of ATS.32
History.33
ETSI
5 ETSI EN 300 267-4 V1.2.4 (2000-06)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://www.etsi.org/ipr).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This European Standard (Telecommunications series) has been produced by ETSI Technical Committee Services and
Protocols for Advanced Networks (SPAN).
The present document is part 4 of a multi-part EN covering the Digital Subscriber Signalling System No. one (DSS1)
protocol specification for the Integrated Services Digital Network (ISDN) telephony 7 kHz, videotelephony,
audiographic conference and videoconference teleservices, as described below:
Part 1: "Protocol specification";
Part 2: "Protocol Implementation Conformance Statement (PICS) proforma specification";
Part 3: "Test Suite Structure and Test Purposes (TSS&TP) specification for the user";
Part 4: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing
(PIXIT) proforma specification for the user";
Part 5: "Test Suite Structure and Test Purposes (TSS&TP) specification for the network";
Part 6: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT)
proforma specification for the network".
National transposition dates
Date of adoption of this EN: 26 May 2000
Date of latest announcement of this EN (doa): 31 August 2000
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 28 February 2001
Date of withdrawal of any conflicting National Standard (dow): 28 February 2001
ETSI
6 ETSI EN 300 267-4 V1.2.4 (2000-06)
1 Scope
The present document specifies the Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information
for Testing (PIXIT) proforma for the User side of the T reference point or coincident S and T reference point (as
defined in ITU-T Recommendation I.411 [16]) of implementations conforming to the stage three standard of the
telephony 7 kHz, videotelephony, audiographic conference and videoconference teleservices for the pan-European
Integrated Services Digital Network (ISDN) by means of the Digital Subscriber Signalling System No. one (DSS1)
protocol, EN 300 267-1 [5].
EN 300 267-3 [7] specifies the Test Suite Structure and Test Purposes (TSS&TP) related to this ATS and partial PIXIT
proforma specification. Other parts specify the TSS&TP and the ATS and partial PIXIT proforma for the Network side
of the T reference point or coincident S and T reference point of implementations conforming to EN 300 267-1 [5].
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
• References are either specific (identified by date of publication, edition number, version number, etc.) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies.
• A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same
number.
[1] ETSI ETS 300 143: "Integrated Services Digital Network (ISDN); Audiovisual services Inband
signalling procedures for audiovisual terminals using digital channels up to 2 048 kbit/s".
[2] ETSI ETS 300 144: "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] ETSI ETS 300 145: "Integrated Services Digital Network (ISDN); Audiovisual services;
Videotelephone systems and terminal equipment operating on one or two 64 kbit/s channels".
[4] ETSI EN 300 196-1 (V1.2): "Integrated Services Digital Network (ISDN); Generic functional
protocol for the support of supplementary services; Digital Subscriber Signalling System No. one
(DSS1) protocol; Part 1: Protocol specification".
[5] ETSI EN 300 267-1 (V1.2): "Integrated Services Digital Network (ISDN); Telephony 7 kHz,
videotelephony, audiographic conference and videoconference teleservices; Digital Subscriber
Signalling System No. one (DSS1) protocol; Part 1: Protocol specification".
[6] ETSI EN 300 267-2 (V1.2): "Integrated Services Digital Network (ISDN); Telephony 7 kHz,
videotelephony, audiographic conference and videoconference teleservices; Digital Subscriber
Signalling System No. one (DSS1) protocol; Part 2: Protocol Implementation Conformance
Statement (PICS) proforma specification".
[7] ETSI EN 300 267-3 (V1.2): "Integrated Services Digital Network (ISDN); Telephony 7 kHz,
videotelephony, audiographic conference and videoconference teleservices; Digital Subscriber
Signalling System No. one (DSS1) protocol; Part 3: Test Suite Structure and Test Purposes
(TSS&TP) specification for the user".
[8] ETSI EN 300 403-1 (V1.2): "Integrated Services Digital Network (ISDN); Digital Subscriber
Signalling System No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call
control; Part 1: Protocol specification [ITU-T Recommendation Q.931 (1993), modified]".
ETSI
7 ETSI EN 300 267-4 V1.2.4 (2000-06)
[9] ETSI ETS 300 403-5: "Integrated Services Digital Network (ISDN); Digital Subscriber Signalling
System No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control;
Part 5: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for
Testing (PIXIT) proforma specification for the user".
[10] ETSI I-ETS 300 763-2: "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".
[11] ISO/IEC 9646-1 (1994): "Information technology; Open Systems Interconnection; Conformance
testing methodology and framework; Part 1: General concepts".
[12] ISO/IEC 9646-2 (1994): "Information technology; Open Systems Interconnection; Conformance
testing methodology and framework; Part 2: Abstract Test Suite specification".
[13] ISO/IEC 9646-3 (1998): "Information technology; Open Systems Interconnection; Conformance
testing methodology and framework; Part 3: The Tree and Tabular Combined Notation (TTCN)".
[14] ISO/IEC 9646-4 (1994): "Information technology; Open Systems Interconnection; Conformance
testing methodology and framework; Part 4: Test realization".
[15] ISO/IEC 9646-5 (1994): "Information technology; Open Systems Interconnection; Conformance
testing methodology and framework; Part 5: Requirements on test laboratories and clients for the
conformance assessment process".
[16] ITU-T Recommendation I.411 (1993): "ISDN user-network interfaces - Reference configurations".
[17] ETSI EN 300 403-3 (V1.2): "Integrated Services Digital Network (ISDN); Digital Subscriber
Signalling System No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call
control; Part 3: Protocol Implementation Conformance Statement (PICS) proforma specification".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the definitions given in EN 300 267-1 [5], ISO/IEC 9646, parts 1 [11]
to 5 [15] and the following terms and definitions apply:
additional B-channel: second or subsequent B-channel established in a videotelephony call.
initial B-channel: first channel established in a videotelephony call.
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ASP Abstract Service Primitive
ATM Abstract Test Method
ATS Abstract Test Suite
BAS Bit rate Allocation Signal
CES Connection Endpoint Suffix
CM Co-ordination Message
CP Co-ordination Point
CRC Cyclic Redundancy Check
ExTS Executable Test Suite
FAW Frame Alignment Word
IUT Implementation Under Test
LT Lower Tester
MOT Means Of Testing
ETSI
8 ETSI EN 300 267-4 V1.2.4 (2000-06)
MTC Main Test Component
PCO Point of Control and Observation
PCTR Protocol Conformance Test Report
PDU Protocol Data Unit
PICS Protocol Implementation Conformance Statement
PIXIT Protocol Implementation eXtra Information for Testing
PTC Parallel Test Component
SUT System Under Test
TP Test Purpose
TSS Test Suite Structure
TTCN Tree and Tabular Combined Notation
4 Introduction
Implementations Under Test (IUTs) which are to be tested using this ATS are required to have previously been tested
for conformity against and passed the test suite for EN 300 403-1 [8], and the ATS related to ETS 300 143 [1],
ETS 300 144 [2] and ETS 300 145 [3] which is contained in I-ETS 300 763-2 [10].
Any messages or fields within messages which are introduced by ETS 300 403-1 [8] are included in this ATS.
Behaviours in test cases have been described in such a way to be able to take into account ETS 300 403-1 [8] basic call
standard. This ATS also takes into account messages defined for the supplementary services, in particular
ETS 300 196-1 [4]. When such messages are received, they are ignored by the ATS as this is not within the scope of the
present document.
5 Abstract Test Method (ATM)
5.1 Description of ATM used
This ATS describes the testing specification of the protocol procedures and switching functions needed to support the
videotelephony, telephony 7 kHz, audiographic conference and videoconference teleservices at T or coincident S and T
reference points for the user.
Testing activity will take place on the D-channel and on one or two B-channels depending on which teleservice is
supported and where the service is provided. The videotelephony, audiographic conference and videoconference
teleservices can employ two or more B-channels and telephony 7 kHz teleservice up to one B-channel. Only S and T
reference point has an associated in-band protocol entity and has to follow requirements on B-channels.
As a consequence of testing multiple channels simultaneously, the concurrent testing method is used. A test
configuration includes at least a master test component for controlling co-ordination and D-channel activity and
eventually one or two PTCs for each involved B-channel. Each of the MTC and PTCs has got a Point of Control and
Observation (PCO). The remote test method as defined in ISO/IEC 9646-2 [12] is applied.
ETSI
9 ETSI EN 300 267-4 V1.2.4 (2000-06)
5.2 Conventions for test components and PCOs
Figure 1 shows a logical view of the complete configuration of the MTC, PTCs, and PCOs. The Co-ordination Point
(CP) relationships between the various components are also indicated. The test method used is very close to the test
method used in I-ETS 300 763-2 [10].
TESTER
MTC
PTCs
CPDB1 CPDB2
MTCD PTCB1 PTCB2
IUT
PCOs
DL B1L B2L
D-channel B-channels
S/T bus
Figure 1: Multi-party test method
In a master/slave arrangement, the MTC is considered to be the master while the PTCs are the slaves.
There are communication paths or CPs between the MTC and each PTC (ie. CPDB1 and CPDB2). The MTC handles all
scheduling of test components and exchanges messages with PTCs to start or to stop the running of their associated tree.
Also, messages concerning more functional synchronization like advising the initial B-channel that it can expand the
mode on two B-channels when the additional B-channel is set up.
5.3 Description of PCOs
The PCOs are used to control and observe the behaviour of the IUT. Preliminary test case verdicts are assigned
depending on the behaviour observed at those points. The final verdict is set by the MTC at the end of the test.
5.3.1 D-channel PCO
For the D-channel, the PCO resides at the service access point between layers 2 and 3. This PCO is named "DL" (L for
Lower). The same Abstract Service Primitives (ASPs) as defined in EN 300 403-5 [9] are used.
ETSI
10 ETSI EN 300 267-4 V1.2.4 (2000-06)
LT SUT
Layer 3 IUT
PCO DL
Layer 2 Layer 2
Layer 1 Layer 1
Service provider
Figure 2: Remote test method
5.3.2 B-channels PCOs
For the in-band signalling protocol there is no explicit layered structure. However, there is an implicitly defined
structure: a lower layer dealing with frame and multiframe structure, bit encoding of BAS codes and their corresponding
CRC codes, FAW etc., and a higher layer dealing with the various sequences and procedures which make use of BAS
codes to control the communication.
Lower layer PCOs and the corresponding declarations have been reused from the ATS specified in
I-ETS 300 763-2 [10]. When a test case needs description behaviour at a higher layer which cannot be easily expressed
at a lower layer, e.g. a complete initialization procedure, and because it is not the purpose of this ATS to check in-band
signalling, references to the test step included in the ATS specified in I-ETS 300 763-2 [10] are made instead of
importing all of the ASN.1 descriptions.
The audio and video signal contents in the frames and multiframes are ignored. Audio encoding/decoding is out of scope
of the present document and requires specific test tools. As it is not possible to analyse the unframed mode, this is not
described in the present document.
In the B-channel, frames or multiframes are required to be sent and received continuously to maintain frame alignment
and this is achieved by looping until the expected frame or multiframe is received or the timer expires.
A procedure for the detection of incorrect CRC4 is described in this ATS. This depends on the detection of an ASP
which is generated when the tester implements CRC4 and detects incorrect bit values in bits C1-C4.
5.4 Naming conventions
5.4.1 Test cases
Test cases have exactly the same reference as the corresponding combined test purpose, see EN 300 267-3 [7].
The structure of a test case identifier is as follows:
- CT_ test case covering a telephony 7 kHz requirement;
- CV_ test case covering a videotelephony requirement;
- CA_ test case covering an audiographic conference requirement;
- CC_ test case covering a videoconference requirement.
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11 ETSI EN 300 267-4 V1.2.4 (2000-06)
The digits correspond to the digits of the first Test Purpose (TP) included in the combined TP. The TPs are ordered:
a) by type of requirement (i.e. generic, telephony 7 kHz, videotelephony, audiographic conference or
videoconference);
b) by a three digit number which specifies the relevant position in the Test Suite Structure (TSS):
- the first digit refers to the third test group level:
1) for Calling user interface (ORIG);
2) for Called user interface (DEST).
- the second digit refers to the fourth test group level:
1) Valid behaviour (BV);
2) Inopportune behaviour (BO).
- the third digit refers to the fifth test group level:
1) Fallback allowed (FBA);
2) Fallback not allowed (FBN);
3) Connection management (CMN).
c) by a two digit sequence number:
- the sequence number follows the order in which the TPs appear.
5.4.2 Variables and parameters
Variables used in PTCs are prefixed by the letter B.
channel nr B_CHN1
channel nr B_CHN2
boolean to end repeat loop B_END_LOOP
boolean to end repeat loop B_END_LOOP2
5.4.3 Trees and subtrees
Test step names use upper case letters and local subtrees use lower case letters.
Preamble subtrees are prefixed by "PR_" and postamble subtrees by "PO_".
6 Untestable test purposes
Combined TPs correspond only to testable TPs and are all covered by the ATS.
TPs for generic protocol requirements do not correspond to specific protocol behaviour and only describe parts of
EN 300 267-1 [5] which support the telephony 7 kHz, videotelephony, audiographic conference and videoconference
teleservices. These TPs have been considered as untestable.
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12 ETSI EN 300 267-4 V1.2.4 (2000-06)
7 ATS conventions
This clause is structured similarly to the structure of a TTCN ATS. However, the names of the subclauses are arranged
in a way more suitable to the present document.
7.1 Declarations part
7.1.1 Type definitions
7.1.1.1 Simple type definitions
Where appropriate, simple types have a length, a value list or a range restriction attached.
Simple types defined as being of some string type (e.g. BITSTRING, OCTETSTRING), have a length restriction or a
value list attached.
Simple types, defined as being of INTEGER type, have a value list or a range restriction attached.
7.1.1.2 Structured type definitions
7.1.1.2.1 TTCN structured type definitions
All structured type definitions are provided with a full name.
All elements in every structured type definition, defined as being of some string type (e.g. BITSTRING,
OCTETSTRING), have a length restriction attached.
If an element in a structured type definition is defined as being of a referenced type, the (possible) restriction is defined
in that referenced type.
For information elements, the identifier which is unique for each element, has its type defined as a simple type where the
value list is restricted to the single value which is the identifier itself. This has the advantage that it allows a test system
derived from this ATS to easily identify information elements embedded in messages. An ATS where information
element identifiers are represented as unrestricted types can present difficulties for a derived test system in the case
where it needs to find one information element embedded in a number of others and the constraints for the other
elements have the any-or-omit value. In such a case the test system cannot easily find the beginning of each information
element.
7.1.1.2.2 ASN.1 structured type definitions
There are no ASN.1 structured type definitions in the ATS.
7.1.1.3 ASP type definitions
7.1.1.3.1 TTCN ASP type definitions
TTCN ASP type definitions only contain one PDU or no PDU at all.
All TTCN ASP type definitions are provided with a full identifier.
Some ASPs are not parameterized as shown in the example in table 1. Such ASPs are only used for requesting or
receiving service from the B-channel lower layer.
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Table 1: TTCN ASP type definition SEND_UNFRAMED
TTCN ASP Type Definition
ASP NAME : SEND_UNFRAMED
PCO Type : BSAP
Comments :Tester will send in unframed mode continuously until another send event occurs
Parameter Name | Parameter Type | Comments
Detailed Comments :
Table 2 shows an example of a parameterized ASP. All ASPs containing PDUs contain only that PDU and no other
parameters.
Table 2: TTCN ASP type definition DL_DAT_RQ
TTCN ASP Type Definition
ASP NAME : DL_DAT_RQ
(DL_DATA_REQUEST)
PCO Type : DSAP
Comments :
Parameter Name | Parameter Type | Comments
mun (MessageUnit) |PDU |
Detailed Comments :
To make TTCN more readable, aliases have been defined for ASPs.
7.1.1.3.2 ASN.1 ASP type definitions
There are no ASN.1 ASP type definitions in the ATS.
7.1.1.4 PDU type definitions
7.1.1.4.1 TTCN PDU type definitions
The TTCN PDU type reflects the actual data being transferred or received. All PDUs for the D-channel are embedded in
ASPs. For the B-channel, because no ASP has been defined for the in-band signalling protocol, frames or multiframes
are sent and received on their own.
A meta-type ASP has been defined for all messages which do not require the fields inside to be referenced. This meta-
type ASP carries the parameter type PDU. There is one meta-type ASP for send events and one for receive events,
named DL_DAT_RQ and DL_DAT_IN, respectively. If certain fields of a PDU have to be referenced, then a particular
ASP type has been defined for that message. For example, the call reference of an outgoing SETUP message needs to be
read by the tester and therefore the ASP type DL_DAT_IN_SETUP has been defined for this event.
7.1.1.4.2 ASN.1 PDU type definitions
There are no ASN.1 PDU type definitions in the ATS.
7.1.2 Test suite constants
Each test suite constant is defined in terms of a predefined type. The values given in the value column will remain
unchanged throughout the ATS.
7.1.3 Test suite parameters
Each test suite parameter is defined in terms of a predefined type or a referenced type. A referenced type is used when it
is necessary to attach restrictions to these type definitions (it is not allowed to include restrictions directly in the test
suite parameter table). The referenced type can have a length or value restriction attached to it in its declaration table.
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7.1.4 Variables
7.1.4.1 Test suite variables
In concurrent TTCN these kind of variables can be used only by the MTC. To check that the IUT can achieve
synchronization in a two B-channel communication, a shared counter is needed in order to send multiframes with the
same numbering in both B-channels. PTCs PTCB1 and PTCB2, corresponding to each B-channel, are located on the
same machine. Therefore, the test suite variables B_SEMAPHORE, B_SMF_COUNTER and
B_SMF_ADDC_COUNTER can be accessed by both PTCs. The B_SEMAPHORE variable is used to prevent the two
PTCs from updating the B_SMF_ADDC_COUNTER simultaneously. B_SMF_COUNTER and
B_SMF_ADDC_COUNTER correspond to the counters for sub-multiframes sent in the initial and the additional
B-channels, respectively.
7.1.4.2 Test case variables
Each test case variable is defined in terms of a predefined type or a referenced type. A referenced type is used when it is
necessary to attach restrictions to these type definitions (it is not allowed to include restrictions directly in the test case
variable table). The referenced type can have a length or value restriction attached to it in its declaration table.
Where test case variables are used in constraints, they are passed as formal parameters.
7.1.5 Test suite operation definitions
The description part of a test suite operation definition uses either natural language or meta C.
Table 3: Test suite operation definition ASSIGN_CHI
Test Suite Operation Definition
Operation Name : ASSIGN_CHI(basic, primary : CHI; basic_flag : BOOLEAN)
Result Type : CHI
Comments : This operation is used to assign a correct Channel identification information
element to PDUs depending on the type of access that is tested.
Description
CHI ASSIGN_CHI(basic,primary,basic_flag)
If the value of the basic_flag is set to TRUE, the result of the operation ASSIGN_CHI will be
the value represented by the parameter basic which is of type CHI. Else the operation results in
the value represented by the parameter primary.
Examples:
ASSIGN_CHI(CHI1b_R1, CHI1p_R1, TRUE) = CHI1b_R1
ASSIGN_CHI(CHI1b_R1, CHI1p_R1, FALSE) = CHI1p_R1
Detailed comments :
The Test Suite Operation Definition shown in table 3 is used in the Constraints Part when assigning an element of type
CHI a value. The CHI type can be defined in two ways depending on whether the ATS is testing Basic or Primary-rate
access. To avoid duplicate types and thereby duplicate test cases this operation is used to assign a value to an element of
CHI type. It takes three parameters:
primary: a constraint of type CHI valid for primary rate access;
basic: a constraint of type CHI valid for basic access;
basic_flag: a Boolean value: TRUE if basic access is applicable, FALSE otherwise.
This operation returns the correct constraint according to the Boolean flag basic_flag. That constraint will then be
assigned to the specific element of type CHI.
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15 ETSI EN 300 267-4 V1.2.4 (2000-06)
7.2 Constraints part
7.2.1 Structured type constraint declaration
For every structured type definition there exists one or more structured type constraint.
7.2.2 ASN.1 type constraint declaration
There are no ASN.1 type constraint declarations in the ATS.
7.2.3 ASP type constraint declaration
7.2.3.1 ASN.1 ASP type constraint declaration
There are no ASN.1 ASP type constraint declarations in the ATS.
7.2.3.2 TTCN ASP type constraint declaration
The PDUs to be sent or received are passed to the TTCN ASP constraint declarations Ms and Mr as parameters of meta
type PDU. Only if values inside a specific PDU have to be referenced, the use of the meta type PDU is not allowed
according to ISO/IEC 9646-3 [13]. In such cases different TTCN ASP constraint declarations are used, which are
defined to carry only a specific type of PDU (e.g. SETUP). Table 4 shows an example of such a TTCN ASP constraint
declaration.
Table 4: TTCN ASP constraint declaration Sr
TTCN ASP Constraint Declaration
Constraint Name : Sr(PARAM: SETUP_PDU)
ASP Type : DL_DAT_IN_SETUP
Derivation Path :
Comments : ASP to indicate the receipt of SETUP messages.
Parameter Name | Parameter Value | Comments
mun |PARAM |
Detailed Comments :
All ASP constraints have a specific value for its parameter. No matching symbols are used in ASP constraints.
7.2.4 PDU type constraint declaration
7.2.4.1 ASN.1 PDU type constraint declaration
There are no ASN.1 PDU type constraint declarations in the ATS.
7.2.4.2 TTCN PDU type constraint declaration
PDU constraints are used for assigning values or patterns to the data being sent or received.
7.2.5 Derived constraints
Derived constraints are used in the ATS for PDUs only.
7.2.6 Parameterized constraints
Parameterized constraints are used in the ATS.
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7.2.7 Value assignment
7.2.7.1 Specific values
For specific value assignment both explicit values and references to explicit values are used.
7.2.7.2 Matching values
As matching values the following mechanisms are used:
Instead of value:
AnyOrOmit "*"
AnyValue "?"
SuperSet SUPERSET
O
...