SIST ETS 300 347-5 E2:2003

V interfaces at the digital Local Exchange (LE); V5.2 interface for the support of Access Network (AN); Part 5: Test Suite Structure and Test Purposes (TSS&TP) specification for the network layer (LE side)

Scope not communicated (nd)

Vmesniki V pri digitalnih krajevnih centralah (LE) – Vmesnik V5.2 za podporo dostopovnemu omrežju (AN) – 5. del: Zgradba preskušalnega niza in nameni preskušanja (TSS&TP) – Specifikacija za omrežno plast na strani krajevne centrale (LE)

General Information

• Status: Published
• Publication Date: 30-Nov-2003
• Withdrawal Date: 30-Sep-1998
• ICS: 33.040.30 - Switching and signalling systems
• 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 300 347-5 ed.2 (1999-04) - V interfaces at the digital Local Exchange (LE); V5.2 interface for the support of Access Network (AN); Part 5: Test Suite Structure and Test Purposes (TSS&TP) specification for the network layer (LE side)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 347-5 E2:2003
01-december-2003
Vmesniki V pri digitalnih krajevnih centralah (LE) – Vmesnik V5.2 za podporo
dostopovnemu omrežju (AN) – 5. del: Zgradba preskušalnega niza in nameni
preskušanja (TSS&TP) – Specifikacija za omrežno plast na strani krajevne centrale
(LE)
V interfaces at the digital Local Exchange (LE); V5.2 interface for the support of Access
Network (AN); Part 5: Test Suite Structure and Test Purposes (TSS&TP) specification for
the network layer (LE side)
Ta slovenski standard je istoveten z: ETS 300 347-5 Edition 2
ICS:
33.040.30 Komutacijski in signalizacijski Switching and signalling
sistem systems
SIST ETS 300 347-5 E2:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 347-5 E2:2003

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SIST ETS 300 347-5 E2:2003
EUROPEAN ETS 300 347-5
TELECOMMUNICATION April 1999
STANDARD Second Edition
Source: SPS Reference: RE/SPS-09056-5
ICS: 33.020
Key words: V interface, V5 interface, PSTN, ISDN, LE, TSS&TP, testing, layer 3, AN
V interfaces at the digital Local Exchange (LE);
V5.2 interface for the support of Access Network (AN);
Part 5: Test Suite Structure and Test Purposes (TSS&TP)
specification for the network layer (LE side)
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
Internet: [e-mail] - http://www.etsi.org
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 1999. 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 Standards Making Support Dept." at the address shown on the title page.

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Contents
Foreword . 7
1 Scope. 9
2 Normative references . 9
3 Definitions and abbreviations. 10
3.1 Definitions. 10
3.2 Abbreviations. 10
4 Test Suite Structure (TSS). 11
4.1 Overview. 11
4.2 Test groups . 12
4.2.1 Protocol groups. 13
4.2.1.1 Control protocol. 13
4.2.1.2 Public Switched Telephone Network (PSTN) protocol. 13
4.2.1.3 Link control protocol . 13
4.2.1.4 Bearer Channel Connection (BCC) protocol . 13
4.2.1.5 Protection protocol . 14
4.2.2 Main test groups . 14
4.2.2.1 Basic interconnection tests (IT). 14
4.2.2.2 Capability tests (CA). 14
4.2.2.3 Valid behaviour tests (BV). 14
4.2.2.4 Inopportune behaviour tests (BO) . 14
4.2.2.5 Invalid behaviour tests (BI). 14
4.2.2.6 Timer expiry and counter mismatch tests (TI). 14
4.2.2.6.1 Timers and counters of the Control
protocol. 14
4.2.2.6.2 Timers and counters of the PSTN
protocol. 15
4.2.2.6.3 Timers and counters of the Link
control protocol. 15
4.2.2.6.4 Timers and counters of the BCC
protocol. 15
4.2.2.6.5 Timers and counters of the Protection
protocol. 15
4.2.2.6.6 Timers and counters of the LE system
management . 15
4.3 Test step structure. 15
4.3.1 State transitions . 15
4.3.1.1 Start-up of V5.2 interface . 16
4.3.1.2 Common control protocol (system management). 18
4.3.1.3 Control protocol (PSTN port FSM) . 18
4.3.1.4 Control protocol (ISDN-BA port FSM) . 18
4.3.1.5 Control protocol (ISDN-PRA port FSM) . 18
4.3.1.6 PSTN protocol. 19
4.3.1.7 Link control protocol . 19
4.3.1.8 BCC protocol. 19
4.3.1.9 Protection protocol . 20
4.3.2 Preambles. 20
4.3.3 Postambles . 20
4.3.4 Status verification. 21
4.3.4.1 PSTN protocol. 21
4.3.4.2 Link control FSM . 21
4.3.5 Common test steps. 21
4.4 Defaults . 21
4.5 Abstract Service Primitives (ASPs) and Protocol Data Units (PDUs) . 21

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4.5.1 ASPs .21
4.5.2 PDUs .21
4.5.2.1 Common control protocol .21
4.5.2.2 Port control protocol.21
4.5.2.3 PSTN protocol .22
4.5.2.4 Link control protocol .22
4.5.2.5 BCC protocol .22
4.5.2.6 Protection protocol.22
4.5.3 Information elements.22
4.5.3.1 Variable length information elements .22
4.5.3.1.1 Control protocol.22
4.5.3.1.2 PSTN protocol .22
4.5.3.1.3 Link control protocol.22
4.5.3.1.4 BCC protocol.22
4.5.3.1.5 Protection protocol.23
4.5.3.2 Single octet information elements .23
4.5.3.2.1 Control protocol.23
4.5.3.2.2 PSTN protocol .23
4.5.3.2.3 Link control protocol.23
4.5.3.2.4 BCC protocol.23
4.5.3.2.5 Protection protocol.23
4.6 Timers and counters of the Abstract Test Suite (ATS).23
5 Test Purposes (TPs) .25
5.1 Introduction .25
5.1.1 Test purpose naming convention .25
5.1.2 Source of test purpose definition.26
5.1.3 Test strategy.26
5.1.3.1 Common control protocol .26
5.1.3.2 Port control protocol.26
5.1.3.3 PSTN protocol .26
5.1.3.4 Link control protocol .27
5.1.3.5 BCC protocol .27
5.1.3.6 Protection protocol.28
5.1.4 Requirements not covered by test purposes.28
5.1.5 Initial states .28
5.1.6 Test and data configuration requirements.29
5.2 Control protocol.29
5.2.1 Basic interconnection tests (V5NWKLE/CTRL/IT).29
5.2.2 Capability tests (V5NWKLE/CTRL/CA).30
5.2.3 Valid behaviour tests (V5NWKLE/CTRL/BV).30
5.2.3.1 V5NWKLE/CTRL/BV/COM.30
5.2.3.2 V5NWKLE/CTRL/BV/PORT .30
5.2.3.2.1 V5NWKLE/CTRL/BV/PORT/TRANS.30
5.2.3.2.2 V5NWKLE/CTRL/BV/PORT/PSTN.30
5.2.3.2.3 V5NWKLE/CTRL/BV/PORT/ISDNBA.30
5.2.3.2.4
.... V5NWKLE/CTRL/BV/PORT/ISDNPRA30
5.2.4 Inopportune behaviour tests (V5NWKLE/CTRL/BO) .32
5.2.4.1 V5NWKLE/CTRL/BO/COM .32
5.2.4.2 V5NWKLE/CTRL/BO/PORT.32
5.2.4.2.1 V5NWKLE/CTRL/BO/PORT/TRANS.32
5.2.4.2.2 V5NWKLE/CTRL/BO/PORT/ISDNBA .33
5.2.4.2.3
....V5NWKLE/CTRL/BO/PORT/ISDNPRA33
5.2.5 Invalid behaviour tests (V5NWKLE/CTRL/BI).33
5.2.6 Timer expiry and counter mismatch tests (V5NWKLE/CTRL/TI).33
5.3 PSTN protocol.33
5.4 Link control protocol.34
5.4.1 Basic interconnection tests (V5NWKLE/LINK/IT) .34
5.4.2 Capability tests (V5NWKLE/LINK/CA) .34
5.4.3 Valid behaviour tests (V5NWKLE/LINK/BV) .34
5.4.3.1 V5NWKLE/LINK/BV/TRANS .34

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5.4.3.2 V5NWKLE/LINK/BV/LINK . 35
5.4.4 Inopportune behaviour tests (V5NWKLE/LINK/BO) . 47
5.4.4.1 V5NWKLE/LINK/BO/TRANS. 47
5.4.4.2 V5NWKLE/LINK/BO/LINK. 47
5.4.5 Invalid behaviour tests (V5NWKLE/LINK/BI) . 50
5.4.5.1 V5NWKLE/LINK/BI/TRANS . 50
5.4.6 Timer expiry and counter mismatch tests (V5NWKLE/LINK/TI). 51
5.4.6.1 V5NWKLE/LINK/TI/TRANS . 51
5.5 BCC protocol . 51
5.5.1 Basic interconnection tests (V5NWKLE/BCC/IT) . 51
5.5.2 Capability tests (V5NWKLE/BCC/CA) . 52
5.5.3 Valid behaviour tests (V5NWKLE/BCC/BV) . 53
5.5.4 Inopportune behaviour tests (V5NWKLE/BCC/BO). 57
5.5.5 Invalid behaviour tests (V5NWKLE/BCC/BI) . 60
5.5.6 Timer expiry and counter mismatch tests (V5NWKLE/BCC/TI) . 62
5.6 Protection protocol. 62
5.6.1 Basic interconnection tests (V5NWKLE/PROTECT/IT). 63
5.6.2 Capability tests (V5NWKLE/PROTECT/CA). 63
5.6.3 Valid behaviour tests (V5NWKLE/PROTECT/BV). 63
5.6.4 Invalid behaviour tests (V5NWKLE/PROTECT/BI). 68
5.6.5 Timer expiry and counter mismatch tests (V5NWKLE/PROTECT/TI) . 69
Annex A (informative): Bibliography. 71
History . 72

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Foreword
This European Telecommunication Standard (ETS) has been produced by the Signalling Protocols and
Switching (SPS) Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS is part 5 of a multi-part standard covering the V5.2 interface as described below:
Part 1: "V5.2 interface specification";
Part 2: "Protocol Implementation Conformance Statement (PICS) proforma";
Part 3: "Test Suite Structure and Test Purposes (TSS&TP) specification for the network layer (AN
side)";
Part 4: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing
(PIXIT) proforma specification for the network layer (AN side)";
Part 5: "Test Suite Structure and Test Purposes (TSS&TP) specification for the network layer
(LE side)";
Part 6: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing
(PIXIT) proforma specification for the network layer (LE side)";
Part 7: "Test Suite Structure and Test Purposes (TSS&TP) specification for the data link layer";
Part 8: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing
(PIXIT) proforma specification for the data link layer";
Part 9: "Test specification for the physical layer".
Transposition dates
Date of adoption of this ETS: 26 March 1999
Date of latest announcement of this ETS (doa): 30 June 1999
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 December 1999
Date of withdrawal of any conflicting National Standard (dow): 31 December 1999

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1 Scope
This fifth part of ETS 300 347 contains the Test Suite Structure and Test Purposes (TSS&TP) for the
NetWorK layer (NWK) and parts of the system management of the Local Exchange (LE) side of a V5.2
interface.
The objective of this ETS is to provide conformance tests giving a high probability of inter-operability of an
Access Network (AN) and a LE from different manufacturers over the V5.2 interface. This ETS covers
only the procedures described in ETS 300 347-1 [2].
ISO/IEC 9646-1 [4] and ISO/IEC 9646-2 [5] are used as the basis for the test methodology.
This ETS needs to be read in conjunction with ETS 300 324-5 [1]. The two documents share a common
format and clauses within ETS 300 324-5 [1] are directly referenced.
Annex A lists the bibliography.
2 Normative references
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 latest
edition of the publication referred to applies.
[1] ETS 300 324-5 (1999): "V interfaces at the digital Local Exchange (LE); V5.1
interface for the support of Access Network (AN); Part 5: Test Suite Structure
and Test Purposes (TSS&TP) specification for the network layer (LE side)".
[2] ETS 300 347-1 (1994) including amendment A1: "V interfaces at the digital
Local Exchange (LE); V5.2 interface for the support of Access Network (AN);
Part 1: V5.2 interface specification".
[3] ETS 300 347-2 (1994): "V interfaces at the digital Local Exchange (LE); V5.2
interface for the support of Access Network (AN); Part 2: Protocol
Implementation Conformance Statement (PICS) proforma".
[4] ISO/IEC 9646-1 (1995): "Information technology - Open systems
interconnection - Conformance testing methodology and framework -
Part 1: General concepts".
[5] ISO/IEC 9646-2 (1995): "Information technology - Open systems
interconnection - Conformance testing methodology and framework -
Part 2: Abstract test suite specification".

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3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the following definitions apply, in addition to those given in
ETS 300 324-5 [1] and ETS 300 347-1 [2]:
specified information element: Information element identifier as defined in ETS 300 347-1 [2]
unspecified information element: Information element identifier which is not defined in
ETS 300 347-1 [2]
incorrect information element: A specified information element carrying information element types
which are not defined in ETS 300 347-1 [2]
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
AIS Alarm Indication Signal
AN Access Network
ASP Abstract Service Primitive
ATS Abstract Test Suite
BCC Bearer Channel Connection
BI Invalid Behaviour
BO Inopportune Behaviour
BV Valid Behaviour
CA Capability
COM Common control protocol
CTRL Control
FE Function Element
FSM Finite State Machine
ID Identifier
IE Information Element
ISDN Integrated Services Digital Network
ISDN-BA ISDN Basic Access
ISDN-PRA ISDN Primary Rate Access
IT Basic Interconnection
IUT Implementation Under Test
L3addr Layer 3 address
LE Local Exchange
LT1 Lower Tester 1
MDU Management Data Unit
MPH Management Physical layer
NWK Network layer
PDU Protocol Data Unit
PICS Protocol Implementation Conformance Statement
PSTN Public Switched Telephone Network
RAI Remote Alarm Indication
REQ Request
SN Sequence Number
SUT System Under Test
TE Terminal Equipment (ISDN or PSTN)
TI Timer
TP Test Purpose
TS Time Slot
TSS Test Suite Structure
UP User Port

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4 Test Suite Structure (TSS)
4.1 Overview
Figure 1 shows the structure of the V5.2 NWK test suite.
V5NW KLE
CTRL IT
CA
BV
COM TRANS/PRO TOCOL
SYS_M AN/ REST
SYS_M AN REVY
PO RT
TRANS/PRO TO CO L
PSTN
IS D N -B A
ISDN-PRA
BO TRANS/PRO TO CO L
COM
SYS_M AN REVY
PO RT TRANS/PRO TO CO L
ISDN-BA
ISDN-PRA
BI COM TRANS/PRO TO CO L
PO RT TRANS/PRO TO CO L
TI
TRANS/PRO TO CO L
COM
TRANS/PRO TO CO L
PO RT
PSTN IT
CA
BV STATE
BO STATE
BI
STATE
TI STATE
LINK
IT
CA
BV TRANS/PRO TO CO L
LINK CTRL
BO TRANS/PRO TO CO L
LINK CTRL
BI
TR AN S/PRO T O C O L
TI
TR AN S/PR O TO C O L
BCC
IT
CA
BV
BO
BI
TI
PRO TECT
IT
CA
BV
BI
TI
Figure 1: NWK LE test suite structure

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4.2 Test groups
Figure 2 gives an overview of the various protocol entities of a V5.2 interface. Table 1 maps each protocol
entity on tested protocol groups.
NWK_LE
FE
DL-DATA
LE_PSTN national
PSTN
LE_RM
MDU
PH-DATA
protocol
MDU
MPH
DL-DATA MDU
LE_BCC
V5
LE_PSTN_port_FSM
MDL
LE_V5_FSM
LE_DL
LE_SYS
DL-DATA MDU
LE_PROT
(ANI)
MDU LE_ISDN_port_FSM
DL-DATA
LE_LINK
FE
MDU
PH
FE
ISDN
DL-DATA
LE_CTRL
layer 2
MPH
management
MPH
LE_LINK_CTRL_FSM
Figure 2: NWK LE - protocol entity overview
Table 1: Names used in figure 2 that correspond to ETS 300 347-1 [2]
Network layer Protocol entities defined in Protocol group references
protocol entities ETS 300 347-1 [2]
LE_PSTN_port_FSM LE_PSTN_user_port_FSM 4.2.1.1
LE_ISDN_port_FSM LE_ISDN-BA_user_port_FSM 4.2.1.1
LE_ISDN-PRA_user_port_FSM
LE_CTRL LE_control_protocol 4.2.1.1
LE_SYS LE_system_management 4.2.1.1
LE_PSTN LE_PSTN_protocol 4.2.1.2
LE_LINK LE_link_control_protocol 4.2.1.3
LE_LINK_CTRL_FSM LE_link_control_FSM 4.2.1.3
LE_RM LE_resource_management 4.2.1.4
LE_BCC LE_BCC_protocol 4.2.1.4
LE_PROT LE_protection_protocol 4.2.1.5

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4.2.1 Protocol groups
4.2.1.1 Control protocol
The contents of this subclause are identical to subclause 4.2.1.1 of ETS 300 324-5 [1] with the following
additions for the ISDN-PRA user port Finite State Machine (FSM).
Depending on provisioning the following configuration is tested:
LE_ISDN-PRA_user_port:
The blocking, blocking request and co-ordinated unblocking procedures of the LE_ISDN-
PRA_user_port_FSM are verified in the test groups V5NWKLE/CTRL/BV/PORT/ISDNPRA and
V5NWKLE/CTRL/BO/PORT/ISDNPRA.
4.2.1.2 Public Switched Telephone Network (PSTN) protocol
The contents of this subclause are identical to subclause 4.2.1.2 of ETS 300 324-5 [1].
4.2.1.3 Link control protocol
All tests in the Link control protocol (V5NWKLE/LINK) test group are intended to verify as thoroughly as
possible the various procedures of the LE_link_control_protocol entity. Depending on provisioning the
following configurations are covered:
LE_link_control_protocol:
The normal and exceptional procedures of the LE_link_control_protocol are verified in the test groups
V5NWKLE/LINK/BV/TRANS, V5NWKLE/LINK/BO/TRANS and V5NWKLE/LINK/TI/TRANS.
The error handling procedures are verified in the test group V5NWKLE/LINK/BI/TRANS.
LE_link_control_FSM:
The link failure, link blocking, link blocking request, co-ordinated link unblocking and link identification
procedures of the LE_link_control_FSM are verified in the test group V5NWKLE/LINK/BV/LINK and
V5NWKLE/LINK/BO/LINK.
4.2.1.4 Bearer Channel Connection (BCC) protocol
All tests in the BCC protocol (V5NWKLE/BCC) test group are intended to verify as thoroughly as possible
the various procedures of the LE_BCC protocol entity.
The following BCC procedures are covered:
- normal and exceptional bearer channel allocation procedure;
- normal and exceptional bearer channel de-allocation procedure;
- audit procedure;
- AN internal failure notification procedure;
- error handling procedures.

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4.2.1.5 Protection protocol
All tests in the Protection protocol (V5NWKLE/PROTECT) test group are intended to verify as thoroughly
as possible the various procedures of the LE Protection protocol entity.
The following Protection protocol procedures are covered:
- transmission of Protection protocol messages;
- normal and exceptional sequence number reset procedure;
- normal and exceptional standard protection switch-over procedure initiated by LE side;
- normal and exceptional dedicated protection switch-over procedure initiated by OS LE;
- normal and exceptional switch-over procedure requested by AN side;
- error handling procedures.
4.2.2 Main test groups
4.2.2.1 Basic interconnection tests (IT)
The contents of this subclause are identical to subclause 4.2.2.1 of ETS 300 324-5 [1].
4.2.2.2 Capability tests (CA)
The contents of this subclause are identical to subclause 4.2.2.2 of ETS 300 324-5 [1].
4.2.2.3 Valid behaviour tests (BV)
The contents of this subclause are identical to subclause 4.2.2.3 of ETS 300 324-5 [1].
4.2.2.4 Inopportune behaviour tests (BO)
The contents of this subclause are identical to subclause 4.2.2.4 of ETS 300 324-5 [1].
4.2.2.5 Invalid behaviour tests (BI)
The contents of this subclause are identical to subclause 4.2.2.5 of ETS 300 324-5 [1].
4.2.2.6 Timer expiry and counter mismatch tests (TI)
Different timers and counters are defined to supervise the various state transitions. This test group is
intended to verify that the FSM is reacting properly to an expire of one of the timers or counter mismatch.
4.2.2.6.1 Timers and counters of the Control protocol
The contents of this subclause are identical to subclause 4.2.2.6.1 of ETS 300 324-5 [1] with additions for
the accelerated alignment procedure. This timers are given in ETS 300 347-1 [2], annex C, table C.1.
TU1 MDU-CTRL(UNBLOCK ALL RELEVANT ACCEPTED) to all PSTN and ISDN user port
FSMs.
TU2 MDU-CTRL(UNBLOCK ALL RELEVANT PORTS REQUEST) to all PSTN and ISDN user
port FSMs.

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4.2.2.6.2 Timers and counters of the PSTN protocol
The contents of this subclause are identical to subclause 4.2.2.6.2 of ETS 300 324-5 [1].
4.2.2.6.3 Timers and counters of the Link control protocol
Refer to ETS 300 347-1 [2], table 23.
LCTO1 LINK CONTROL message sent
4.2.2.6.4 Timers and counters of the BCC protocol
Refer to ETS 300 347-1 [2], table 46.
TBCC1 ALLOCATION sent
TBCC2 DE-ALLOCATION sent
TBCC3 DE-ALLOCATION sent
TBCC4 AUDIT sent
4.2.2.6.5 Timers and counters of the Protection protocol
Refer to ETS 300 347-1 [2], table 64.
TSO1 SWITCH-OVER COM sent
TSO2 OS-SWITCH-OVER COM sent
TSO4 RESET SN COM sent
TSO5 RESET SN COM received
Refer to ETS 300 347-1 [2], subclause 18.6.2.
VP(S) Send State Variable
VP(R) Receive State Variable
4.2.2.6.6 Timers and counters of the LE system management
The contents of this subclause are identical to subclause 4.2.6.3 of ETS 300 324-5 [1].
4.3 Test step structure
General dynamic behaviours are described in test steps which can be called from all test cases within the
Abstract Test Suite (ATS):
state transitions (refer to subclause 4.3.1);
preambles (refer to subclause 4.3.2);
postambles (refer to subclause 4.3.3);
status verification (refer to subclause 4.3.4);
common test steps (refer to subclause 4.3.5).
4.3.1 State transitions
The following subclauses identify the test steps used in the ATS. In general, each test step represents a
state transition. For example in the PSTN protocol, PSTN_LE1_2 is the test step which brings the LE
PSTN protocol FSM from PSTN_path_state LE1 to PSTN_path_state LE2. The state transitions are
declared in the parenthesis (originating state - destination state) which follow the test step names.

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Six groups of state transitions are defined:
STARTUP start up the V5 interface and put the IUT into the initial state as defined in
subclause 5.1.5.
CTRL state transitions used to preamble and postamble the Control protocol before a test
purpose can be performed.
PSTN state transitions used to preamble and postamble the PSTN protocol before a test
purpose can be performed.
LINK state transitions used to preamble and postamble the Link control protocol before a
test purpose can be performed.
BCC state transitions used to preamble and postamble the BCC protocol before a test
purpose can be perfo
...