SIST ETS 300 336:1998

• Abstract:

  Definition of the tests of the MTP level 2 and 3 in order to support compatibility and validation procedures for node having implemented T/S 43-01

• Status: Published
• Publication Date: 30-Nov-1998
• ICS: 33.080 - Integrated Services Digital Network (ISDN)
• Technical Committee: SPS - Signalling protocols and switching
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-1998
• Due Date: 01-Dec-1998
• Completion Date: 01-Dec-1998
• Ref Project: ETSI ETS 300 336 ed.1 (1996-09) - Integrated Services Digital Network (ISDN); Signalling System No.7; Message Transfer Part (MTP); Test specification [ITU-T Recommendations Q.781 and Q.782 (1993), modified]

SIST ETS 300 336:1998 is the Slovenian adoption of ETS 300 336, an ETSI European Telecommunication Standard for Integrated Services Digital Network (ISDN) signalling. It specifies detailed tests for Signalling System No.7 (SS7) Message Transfer Part (MTP) level 2 and level 3, so implementers can validate nodes against the protocol in ETS 300 008-1 and the test rules in ITU-T Recommendation Q.780. The document is a modified version of ITU-T Recommendations Q.781 and Q.782 (1993).

What does SIST ETS 300 336:1998 specify?

SIST ETS 300 336:1998 specifies a set of detailed tests for MTP level 2 and level 3. In practice, these tests are used to check that an implementation behaves correctly in link control, message handling, congestion handling, and route management scenarios.

The standard is organized as a global modifications section followed by specific modifications to tests taken from ITU-T Recommendation Q.781 and ITU-T Recommendation Q.782. Those modified tests form the main technical content.

The scope states that the tests are intended to validate the protocol specified in ETS 300 008-1 and that the standard follows the basic test rules of ITU-T Recommendation Q.780, while adding level-specific principles for level 2 and level 3.

What are the key requirements of SIST ETS 300 336:1998?

The standard’s practical content is a set of conformance-style test cases. Each test defines the setup, the message sequence, and the expected response, so a laboratory can check whether a node enters the right state, sends the right signalling messages, and preserves traffic correctly.

Link state control and alignment

Tests 1.5 and 1.7 in the Q.781 modifications check normal alignment and the response during the proving period. They verify that a link moves into “In service” correctly and reacts properly when an SIO is received during proving.

For a tester, this means checking the transition into service, not just that messages are exchanged. The tests also include VAT-specific checks with different LSSU status field lengths.

Processor outage and signal unit handling

Test 4.1 covers setting and clearing LPO while the link is in service. It checks that the implementation discards traffic during outage and flushes old buffered messages after recovery.

Test 5.3 checks signal unit delimitation, alignment, and error detection when a received signal unit is below the minimum length. In practice, this confirms that corrupted traffic is rejected and that the link remains stable when a correct FISU arrives afterward.

Test 9.7 checks MSU transmission while RPO is set and whether retransmission stops correctly without false link-failure detection.

Route management and congestion control

Test 2.3 in the Q.782 modifications checks reception of a message with an erroneous SI. The point is to confirm that invalid distribution information does not disturb traffic, apart from the possible UPU response mentioned in the test.

Test 3.21 covers changeover on reception of COO or ECO. It checks that traffic is moved to the available link without loss, duplication, or missequencing, which is the key operational risk in live networks.

Test 4.5 and 4.11 cover changeback behavior. They verify repeated CBD handling, timing of T4 and T5, and time-controlled diversion when a route has to be restored or rerouted.

Test 8.2 covers signalling traffic flow control. It checks that congestion detection triggers TFC messages and that traffic resumes normally once the load drops.

Signalling route management and invalid messages

Tests 9.1.1 and 9.1.2 check transfer prohibited handling on alternative routes, including TFP and TFA behavior and timeout T8. These tests matter because route failures must be announced and traffic diverted consistently across the network.

Tests 13.7 and 13.8 cover unusual invalid TFA, TFP, and RST messages. The expected result is that such messages are discarded without disturbing traffic, which is important for resilience against malformed signalling.

What terms does SIST ETS 300 336:1998 define?

• Integrated Services Digital Network (ISDN) - the digital network environment in which the signalling tests are applied.
• Signalling System No.7 (SS7) - the signalling system whose MTP behavior is exercised by the tests.
• Message Transfer Part (MTP) - the SS7 transport and routing part under test at levels 2 and 3.
• Fill-In Signal Unit (FISU) - a signal unit used in the tests to maintain link supervision when there is no message traffic.
• Message Signal Unit (MSU) - a signal unit carrying signalling messages, used throughout the tests to check delivery and retransmission.
• Transfer Prohibited (TFP) - a route-management message used to block traffic toward an unavailable destination.
• Transfer Controlled (TFC) - a congestion-control message used to report level 3 congestion.

Who uses SIST ETS 300 336:1998?

SIST ETS 300 336:1998 is used by SS7 and ISDN equipment designers, protocol implementers, and conformance test laboratories. It is also relevant to network operators, quality managers, and buyers who need to verify that a node implementing T/S 43-01 behaves correctly under link failures, congestion, and route changes.

In practice, teams use it for validation, interoperability checking, and acceptance testing of signalling nodes and signalling links.

Which standards are used with SIST ETS 300 336:1998?

The document relies on ETS 300 008-1 for the MTP protocol specification being tested. That reference tells the reader what protocol behavior the tests are validating.

It also relies on ITU-T Recommendation Q.780 for the general description of SS7 test specification rules. The modified tests themselves refer repeatedly to Q.701, Q.702, Q.703, Q.704, and Q.707 as modified by ETS 300 008-1, because those parts define the protocol behavior being exercised.

What does the SIST ETS 300 336:1998 document contain?

The document contains step-by-step test definitions with pre-test conditions, configurations, message sequences, and expected results. The modified tests show how to drive a node through alignment, proving, outage, congestion, changeover, changeback, and invalid-message cases.

Many tests include message-sequence diagrams and references to figures from Q.703 and Q.704. For a lab, that means the document is not just descriptive - it provides the exact interaction pattern to reproduce during verification.

It also includes timing checks such as T4, T5, T7, T8, T21, and T3 where those timers are part of the expected behavior. That helps test engineers confirm not only the final state, but also that the transition happens within the intended protocol timing.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Integrated Services Digital Network (ISDN); Signalling System No.7; Message Transfer Part (MTP); Test specification [ITU-T Recommendations Q.781 and Q.782 (1993), modified]33.080Digitalno omrežje z integriranimi storitvami (ISDN)Integrated Services Digital Network (ISDN)ICS:Ta slovenski standard je istoveten z:ETS 300 336 Edition 13SIST ETS 300 336:1998en01-IHEUXDU-19983SIST ETS 300 336:1998SLOVENSKI
STANDARD
EUROPEANETS 300 336TELECOMMUNICATIONSeptember 1996STANDARDSource: ETSI TC-SPSReference: T/S 43-17ICS:33.080Key words:ISDN, SS7, MTP, testingIntegrated Services Digital Network (ISDN);Signalling System No.7;Message Transfer Part (MTP);Test specification[ITU-T Recommendations Q.781 and Q.782 (1993), modified]ETSIEuropean Telecommunications Standards InstituteETSI SecretariatPostal address: F-06921 Sophia Antipolis CEDEX - FRANCEOffice address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCEX.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail].: [phone] - Fax: [phone]Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and theforegoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1996. All rights reserved.SIST ETS 300 336:1998

Page 2ETS 300 336: September 1996ForewordThis European Telecommunication Standard (ETS) has been produced by the Signalling Protocols andSwitching (SPS) Technical Committee of the European Telecommunications Standards Institute (ETSI).Transposition datesDate of adoption of this ETS:6 September 1996Date of latest announcement of this ETS (doa):31 December 1996Date of latest publication of new National Standardor endorsement of this ETS (dop/e):30 June 1997Date of withdrawal of any conflicting National Standard (dow):30 June 1997Endorsement noticeThe text of ITU-T Recommendations Q.781 (1993) and Q.782 (1993) was approved by ETSI as an ETSwith agreed modifications as given below.NOTE:New or modified text is indicated using sidebars. In addition, underlining and/or strike-out are used to highlight detailed modifications where necessary. For the tests, boldfont is used in addition to increase legibility.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.SIST ETS 300 336:1998

Page 3ETS 300 336: September 1996Global modifications to ITU-T Recommendations Q.781 and Q.782Insert the following two clauses (scope and normative references):ScopeThis European Telecommunication Standard (ETS) defines a set of detailed tests of the Signalling SystemNo.7 Message Transfer Part (MTP) level 2 and level 3 protocol. These tests intend to validate the protocolspecified in ETS 300 008-1 [1].This ETS conforms to ITU-T Recommendation Q.780 [2] which describes the basic rules of the testspecifications, however, it contains additional general principles specific to level 2 and level 3 tests,respectively.Normative referencesThis ETS incorporates by dated and undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listedhereafter. For dated references, subsequent amendments to or revisions of any of these publicationsapply to this ETS only when incorporated in it by amendment or revision. For undated references the latestedition of the publication referred to applies.[1]ETS 300 008-1: "Integrated Services Digital Network (ISDN); Signalling SystemNo.7; Message Transfer Part (MTP) to support international interconnection;Part 1: Protocol specification [ITU-T Recommendations Q.701 (1993),Q.702 (1988), Q.703 to Q.706 (1993), Q.707 (1988) and Q.708 (1993),modified]".[2]ITU-T Recommendation Q.780 (1993): "Signalling System No.7 testspecification general description".Throughout the text of ITU-T Recommendations Q.781 and Q.782Replace references as shown below.Reference in ITU-TRecommendationsQ.781 and Q.782Modified referenceITU-T Recommendation Q.701ITU-T Recommendation Q.701 as modified by ETS 300 008-1 [1]ITU-T Recommendation Q.702ITU-T Recommendation Q.702 as modified by ETS 300 008-1 [1]ITU-T Recommendation Q.703ITU-T Recommendation Q.703 as modified by ETS 300 008-1 [1]ITU-T Recommendation Q.704ITU-T Recommendation Q.704 as modified by ETS 300 008-1 [1]ITU-T Recommendation Q.707ITU-T Recommendation Q.707 as modified by ETS 300 008-1 [1]SIST ETS 300 336:1998

Page 4ETS 300 336: September 1996Modifications to ITU-T Recommendation Q.781Test number 1.5Modify the test as follows:TEST NUMBER:
1.5PAGE:
1 OF 1REFERENCE:
Q.703 Clause 7
STD:
Fig. 8; Fig. 9TITLE:
Link State Control – Expected signal units/ordersSUB TITLE:
Normal alignment – correct procedure (FISU)PURPOSE:
To check normal alignment procedurePRE-TEST CONDITIONS:
Link out of serviceCONFIGURATION:
1TYPE
OF TEST:
VAT, CPTMESSAGE SEQUENCE:SPBSPALinkLink<-------------------------1 – 0:
SIOS1 – 0SIOS ------------------------->:
start<-------------------------1 – 0:
SIO1 – 0SIO -------------------------><-------------------------1 – 0:
SIN1 – 0SIN -------------------------><-------------------------1 – 0:
FISU1 – 0FISU ------------------------->TEST DESCRIPTION1.Start normal alignment procedure.2.Check link aligns and enters “In service” state.3.Check that “In service” state is maintained.4.In VAT only check it is possible to perform a normal alignment procedure in the following cases:–
use LSSU in point B with a status field of 8 bits;–
use LSSU in point B with a status field of 16 bits.SIST ETS 300 336:1998

Page 5ETS 300 336: September 1996Test number 1.7Modify the test as follows:TEST NUMBER:
1.7PAGE:
1 OF 1REFERENCE:
Q.703 Clauses 7, 10.3
STD:
Fig. 9; Fig. 17TITLE:
Link State Control – Expected signal units/ordersSUB TITLE:
SIO received during normal proving periodPURPOSE:
To test the response to the reception of an SIO during the normal proving periodPRE-TEST CONDITIONS:
Link out of serviceCONFIGURATION:
1TYPE
OF TEST:
VATEXPECTED SIGNAL UNIT SEQUENCE:SPBSPALinkLink<-------------------------1 – 0:
SIOS1 – 0SIOS ------------------------->:
start<-------------------------1 – 0:
SIO1 – 0SIO -------------------------><-------------------------1 – 0:
SIN1 – 0SIN ------------------------->
T4
Stopped1 – 0SIO (one only) ------------------------->1 – 0SIN -------------------------><-------------------------1 – 0
SIN
T4(Pn)<-------------------------1 – 0:
FISUTEST DESCRIPTION1.Send an SIO at B during normal proving period.2.Check that new normal period is entered.SIST ETS 300 336:1998

Page 6ETS 300 336: September 1996Test number 4.1Modify the test as follows:TEST NUMBER:
4.1PAGE:
1 OF 1REFERENCE:
Q.703 Clause 8
STD:
Fig. 10TITLE:
Processor outage controlSUB TITLE:
Set and clear LPO while link in servicePURPOSE:To check the ability to perform correctly when LPO is set and recoveredPRE-TEST CONDITIONS:
Link in serviceCONFIGURATION:
1TYPE
OF TEST:
VATEXPECTED SIGNAL UNIT SEQUENCE:SPBSPALinkLink<-------------------------1 – 0:FISU(FSN = 7F, BSN = 7F)1 – 0FISU
------------------------->(FSN = 7F, BSN = 7F)accepted<-------------------------1 – 0MSU (1)(FSN = 0, BSN = 7F)<-------------------------1 – 0MSU (2)(FSN = 1, BSN = 7F):
set LPO1 – 0MSU
------------------------->(FSN = 0, BSN = 0)<-------------------------1 – 0SIPO(FSN = 1 0, BSN = 7F)1 – 0FISU
------------------------->(FSN == 0, BSN == 0):
clear LPO<-------------------------1 – 0MSU (3)(FSN = 1, BSN = 5)TEST DESCRIPTION1.Set LPO at A while link in service.2.Check that MSU from B is discarded.3.Clear LPO at A after at least 1,2 s.4.Check that “old” messages are flushed from level 2 buffers and not transmitted on the link. Check that new MSUs aresent correctly.SIST ETS 300 336:1998

Page 7ETS 300 336: September 1996Test number 5.3Modify the test as follows:TEST NUMBER:
5.3PAGE:
1 OF 1REFERENCE:
Q.703 subclause 4.1
STD:
Fig. 11TITLE:
SU delimitation, alignment, error detection and correctionSUB TITLE:
Below minimum signal unit lengthPURPOSE:To test the signal unit delimitation, alignment and error detection action on receipt of signal unit less than theminimum lengthPRE-TEST CONDITIONS:
Link in serviceCONFIGURATION:
1TYPE
OF TEST:
VATEXPECTED SIGNAL UNIT SEQUENCE:SPBSPALinkLink<-------------------------1 – 0:
FISU:
(BIB + BSN = FF)1 – 0FISU ------------------------->1 – 0corrupt MSU
------------------------->(FIB + FSN = 80)(signal unit lessthan 6 octets)<-------------------------1 – 0:
FISU:
(BSN unchanged)1 – 0FISU ------------------------->TEST DESCRIPTION1.Generate a corrupt MSU at B of less than 6 octet (i.e. less than 5 octets between flags).2.Check A discards the signal unit, and may go goes into octet counting mode.3.On reception of a correct FISU, check that A leaves the octet counting mode if it was entered and remains in the “inservice” state.SIST ETS 300 336:1998

Page 8ETS 300 336: September 1996Test number 9.7Modify the test as follows:TEST NUMBER:
9.7PAGE:
1 OF 1REFERENCE:
Q.703 subclause 6.2
STD:
Fig. 15TITLE:
Transmission and reception control (PCR)SUB TITLE:
MSU transmission while RPO setPURPOSE:To ensure correct performance while RPO is setPRE-TEST CONDITIONS:
Link in serviceCONFIGURATION:
1TYPE
OF TEST:
VATEXPECTED SIGNAL UNIT SEQUENCE:SPBSPALinkLink<-------------------------1 – 0FISU(FSN = 7F, BSN = 7F)1 – 0FISU(FSN = 7F, BSN = 7F) ------------------------->Iooooo<-------------------------1 – 0MSU(FSN = 0, BSN = 7F): set LPO(I:(I:1 – 0SIPO(FSN = 7F, BSN = 7F) ------------------------->Iooooo<-------------------------1 – 0FISU(FSN = 0, BSN = 7F): clear LPO(I:(I:1 – 0MSU(FSN = 0, BSN = 7F) ------------------------->Iooooo<-------------------------1 – 0FISU(FSN = 7F 0, BSN = 0)1 – 0MSU(FSN = 0, BSN = 7F) ------------------------->Iooooo<-------------------------1 – 0FISU(FSN = 7F 0, BSN = 0)TEST DESCRIPTION1.Generate an MSU at A.2.Instead of sending positive acknowledgement, set and keep PO at B for at least 1,2 s.3.Check A stops a retransmission of the MSU and sends FISUs, and does not detect link failure by the expiration of T7.4.Cease PO after at least 1,2 s and send an MSU with no positive acknowledgement at B.5.Check A flushed its buffer and no old MSU is sent.6.Generate an MSU at B.7.Check A receives the MSU and responds correctly.SIST ETS 300 336:1998

Page 9ETS 300 336: September 1996Modifications to ITU-T Recommendation Q.782Test number 2.3Modify the test as follows:TEST
NUMBER:
2.3PAGE:
1 of 1REFERENCE:
Q.704 subclause 2.4
Fig. 24, Fig. 25TITLE:
Signalling message handlingSUBTITLE:
Message received with an erroneous SI (distribution function)PURPOSE:
To check the response to a message received with an erroneous SIPRE-TEST
CONDITIONS:
Signalling linkset activatedCONFIGURATION:
ATYPE
OF
TEST:
VATTYPE
OF
SP:
ALLMESSAGE
SEQUENCE:SP
ASP
BLinkLink<-------------------------
1 – 1:Invalid SLTM:(erroneous invalid SI)TEST
DESCRIPTION1.Send an SLTM message with an invalid SI.2.Check that no response is received except perhaps a UPU (cause unequipped) when the SI used does not exist.SIST ETS 300 336:1998

Page 10ETS 300 336: September 1996Test number 3.21Modify the test as follows:TEST
NUMBER:
3.21PAGE:
1 of 1REFERENCE:
Q.704 clause 5
Fig. 28, Fig. 29, Fig. 30TITLE:
ChangeoverSUBTITLE:
Reception of a changeover order on an available linkPURPOSE:
To check the changeover procedure on reception of a COO or ECO for a link in servicePRE-TEST
CONDITIONS:
Linkset with two available linksCONFIGURATION:
ATYPE
OF
TEST:
VATTYPE
OF
SP:
ALLMESSAGE
SEQUENCE:SP
ASP
BLinkLink:Start traffic1 – 1TRAFFIC----------------------------------------------><----------------------------------------------1 – 1
TRAFFIC1 – 2TRAFFIC----------------------------------------------><----------------------------------------------1 – 2
TRAFFIC<----------------------------------------------1 – 2
COO, SLC
1 – 11 – 2
(FSN corresponding to1 – 2
the last received message)1 – 2COA, SLC
1 – 1---------------------------------------------->1 – 2TRAFFIC(from 1 – 1)----------------------------------------------><----------------------------------------------1 – 2
TRAFFIC (from 1 – 1):Wait:Stop trafficTEST
DESCRIPTION1.Start traffic to B and C on all the links.2.Send a COO from B to A for 1 – 1 on link 1 – 2 and check that the COA is received.3.Check that the link 1 – 1 becomes unavailable.4.Sto
...

SLOVENSKI STANDARD
01-december-1998
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SUHQRVQLGHO0733UHVNXãDOQDVSHFLILNDFLMDSUHREOLNRYDQLSULSRURþLOL,787
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Integrated Services Digital Network (ISDN); Signalling System No.7; Message Transfer
Part (MTP); Test specification [ITU-T Recommendations Q.781 and Q.782 (1993),
modified]
Ta slovenski standard je istoveten z: ETS 300 336 Edition 1
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 ETS 300 336
TELECOMMUNICATION September 1996
STANDARD
Source: ETSI TC-SPS Reference: T/S 43-17
ICS: 33.080
Key words: ISDN, SS7, MTP, testing
Integrated Services Digital Network (ISDN);
Signalling System No.7;
Message Transfer Part (MTP);
Test specification
[ITU-T Recommendations Q.781 and Q.782 (1993), modified]
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: [e-mail]
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 1996. All rights reserved.

Page 2
ETS 300 336: September 1996
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).
Transposition dates
Date of adoption of this ETS: 6 September 1996
Date of latest announcement of this ETS (doa): 31 December 1996
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30 June 1997
Date of withdrawal of any conflicting National Standard (dow): 30 June 1997
Endorsement notice
The text of ITU-T Recommendations Q.781 (1993) and Q.782 (1993) was approved by ETSI as an ETS
with agreed modifications as given below.
NOTE: New or modified text is indicated using sidebars. In addition, underlining and/or strike-
out are used to highlight detailed modifications where necessary. For the tests, bold
font is used in addition to increase legibility.
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.

Page 3
ETS 300 336: September 1996
Global modifications to ITU-T Recommendations Q.781 and Q.782
Insert the following two clauses (scope and normative references):
Scope
This European Telecommunication Standard (ETS) defines a set of detailed tests of the Signalling System
No.7 Message Transfer Part (MTP) level 2 and level 3 protocol. These tests intend to validate the protocol
specified in ETS 300 008-1 [1].
This ETS conforms to ITU-T Recommendation Q.780 [2] which describes the basic rules of the test
specifications, however, it contains additional general principles specific to level 2 and level 3 tests,
respectively.
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 300 008-1: "Integrated Services Digital Network (ISDN); Signalling System
No.7; Message Transfer Part (MTP) to support international interconnection;
Part 1: Protocol specification [ITU-T Recommendations Q.701 (1993),
Q.702 (1988), Q.703 to Q.706 (1993), Q.707 (1988) and Q.708 (1993),
modified]".
[2] ITU-T Recommendation Q.780 (1993): "Signalling System No.7 test
specification general description".
Throughout the text of ITU-T Recommendations Q.781 and Q.782
Replace references as shown below.
Reference in ITU-T
Recommendations Modified reference
Q.781 and Q.782
ITU-T Recommendation Q.701 ITU-T Recommendation Q.701 as modified by ETS 300 008-1 [1]
ITU-T Recommendation Q.702 ITU-T Recommendation Q.702 as modified by ETS 300 008-1 [1]
ITU-T Recommendation Q.703 ITU-T Recommendation Q.703 as modified by ETS 300 008-1 [1]
ITU-T Recommendation Q.704 ITU-T Recommendation Q.704 as modified by ETS 300 008-1 [1]
ITU-T Recommendation Q.707 ITU-T Recommendation Q.707 as modified by ETS 300 008-1 [1]

Page 4
ETS 300 336: September 1996
Modifications to ITU-T Recommendation Q.781
Test number 1.5
Modify the test as follows:
TEST NUMBER:  1.5 PAGE:  1 OF 1
REFERENCE:  Q.703 Clause 7     STD:  Fig. 8; Fig. 9
TITLE:  Link State Control – Expected signal units/orders
SUB TITLE:  Normal alignment – correct procedure (FISU)
PURPOSE:  To check normal alignment procedure
PRE-TEST CONDITIONS:  Link out of service
CONFIGURATION:  1 TYPE OF TEST:  VAT, CPT
MESSAGE SEQUENCE:
SP B SP A
Link Link
<------------------------- 1 – 0 :  SIOS
1 – 0 SIOS ------------------------->
:  start
<------------------------- 1 – 0 :  SIO
1 – 0 SIO ------------------------->
<------------------------- 1 – 0 :  SIN
1 – 0 SIN ------------------------->
<------------------------- 1 – 0 :  FISU
1 – 0 FISU ------------------------->
TEST DESCRIPTION
1. Start normal alignment procedure.
2. Check link aligns and enters “In service” state.
3. Check that “In service” state is maintained.
4. In VAT only check it is possible to perform a normal alignment procedure in the following cases:
–   use LSSU in point B with a status field of 8 bits;
–   use LSSU in point B with a status field of 16 bits.

Page 5
ETS 300 336: September 1996
Test number 1.7
Modify the test as follows:
TEST NUMBER:  1.7 PAGE:  1 OF 1
REFERENCE:  Q.703 Clauses 7, 10.3     STD:  Fig. 9; Fig. 17
TITLE:  Link State Control – Expected signal units/orders
SUB TITLE:  SIO received during normal proving period
PURPOSE:  To test the response to the reception of an SIO during the normal proving period
PRE-TEST CONDITIONS:  Link out of service
CONFIGURATION:  1 TYPE OF TEST:  VAT
EXPECTED SIGNAL UNIT SEQUENCE:
SP B SP A
Link Link
<------------------------- 1 – 0 :  SIOS
1 – 0 SIOS ------------------------->
:  start
<------------------------- 1 – 0 :  SIO
1 – 0 SIO ------------------------->
<------------------------- 1 – 0 :  SIN
1 – 0 SIN ------------------------->
T4
Stopped
1 – 0 SIO (one only) ------------------------->
1 – 0 SIN ------------------------->
SIN
<------------------------- 1 – 0
T4(Pn)
<------------------------- 1 – 0 :  FISU
TEST DESCRIPTION
1. Send an SIO at B during normal proving period.
2. Check that new normal period is entered.

Page 6
ETS 300 336: September 1996
Test number 4.1
Modify the test as follows:
TEST NUMBER:  4.1 PAGE:  1 OF 1
REFERENCE:  Q.703 Clause 8     STD:  Fig. 10
TITLE:  Processor outage control
SUB TITLE:  Set and clear LPO while link in service
PURPOSE: To check the ability to perform correctly when LPO is set and recovered
PRE-TEST CONDITIONS:  Link in service
CONFIGURATION:  1 TYPE OF TEST:  VAT
EXPECTED SIGNAL UNIT SEQUENCE:
SP B SP A
Link Link
<------------------------- 1 – 0 :FISU
(FSN = 7F, BSN = 7F)
1 – 0 FISU  ------------------------->
(FSN = 7F, BSN = 7F)
accepted
<------------------------- 1 – 0 MSU (1)
(FSN = 0, BSN = 7F)
<------------------------- 1 – 0 MSU (2)
(FSN = 1, BSN = 7F)
:  set LPO
1 – 0 MSU  ------------------------->
(FSN = 0, BSN = 0)
<------------------------- 1 – 0 SIPO
(FSN = 1 0, BSN = 7F)
1 – 0 FISU  ------------------------->
(FSN == 0, BSN == 0)
:  clear LPO
<------------------------- 1 – 0 MSU (3)
(FSN = 1, BSN = 5)
TEST DESCRIPTION
1. Set LPO at A while link in service.
2. Check that MSU from B is discarded.
3. Clear LPO at A after at least 1,2 s.
4. Check that “old” messages are flushed from level 2 buffers and not transmitted on the link. Check that new MSUs are
sent correctly.
Page 7
ETS 300 336: September 1996
Test number 5.3
Modify the test as follows:
TEST NUMBER:  5.3 PAGE:  1 OF 1
REFERENCE:  Q.703 subclause 4.1     STD:  Fig. 11
TITLE:  SU delimitation, alignment, error detection and correction
SUB TITLE:  Below minimum signal unit length
PURPOSE: To test the signal unit delimitation, alignment and error detection action on receipt of signal unit less than the
minimum length
PRE-TEST CONDITIONS:  Link in service
CONFIGURATION:  1 TYPE OF TEST:  VAT
EXPECTED SIGNAL UNIT SEQUENCE:
SP B SP A
Link Link
<------------------------- 1 – 0 :  FISU
:  (BIB + BSN = FF)
------------------------->
1 – 0 FISU
1 – 0 corrupt MSU  ------------------------->
(FIB + FSN = 80)
(signal unit less
than 6 octets)
<------------------------- 1 – 0 :  FISU
:  (BSN unchanged)
1 – 0 FISU ------------------------->
TEST DESCRIPTION
1. Generate a corrupt MSU at B of less than 6 octet (i.e. less than 5 octets between flags).
2. Check A discards the signal unit, and may go goes into octet counting mode.
3. On reception of a correct FISU, check that A leaves the octet counting mode if it was entered and remains in the “in
service” state.
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ETS 300 336: September 1996
Test number 9.7
Modify the test as follows:
TEST NUMBER:  9.7 PAGE:  1 OF 1
REFERENCE:  Q.703 subclause 6.2     STD:  Fig. 15
TITLE:  Transmission and reception control (PCR)
SUB TITLE:  MSU transmission while RPO set
PURPOSE: To ensure correct performance while RPO is set
PRE-TEST CONDITIONS:  Link in service
CONFIGURATION:  1 TYPE OF TEST:  VAT
EXPECTED SIGNAL UNIT SEQUENCE:
SP B SP A
Link Link
<------------------------- 1 – 0 FISU
(FSN = 7F, BSN = 7F)
1 – 0 FISU ------------------------->Iooooo
(FSN = 7F, BSN = 7F)
<------------------------- 1 – 0 MSU
(FSN = 0, BSN = 7F)
: set LPO (I:
(I:
1 – 0 SIPO ------------------------->Iooooo
(FSN = 7F, BSN = 7F)
<------------------------- 1 – 0 FISU
(FSN = 0, BSN = 7F)
: clear LPO (I:
(I:
1 – 0 MSU ------------------------->Iooooo
(FSN = 0, BSN = 7F)
<------------------------- 1 – 0 FISU
(FSN = 7F 0, BSN = 0)
1 – 0 MSU ------------------------->Iooooo
(FSN = 0, BSN = 7F)
<------------------------- 1 – 0 FISU
(FSN = 7F 0, BSN = 0)
TEST DESCRIPTION
1. Generate an MSU at A.
2. Instead of sending positive acknowledgement, set and keep PO at B for at least 1,2 s.
3. Check A stops a retransmission of the MSU and sends FISUs, and does not detect link failure by the expiration of T7.
4. Cease PO after at least 1,2 s and send an MSU with no positive acknowledgement at B.
5. Check A flushed its buffer and no old MSU is sent.
6. Generate an MSU at B.
7. Check A receives the MSU and responds correctly.

Page 9
ETS 300 336: September 1996
Modifications to ITU-T Recommendation Q.782
Test number 2.3
Modify the test as follows:
TEST NUMBER:  2.3 PAGE:  1 of 1
REFERENCE:  Q.704 subclause 2.4     Fig. 24, Fig. 25
TITLE:  Signalling message handling
SUBTITLE:  Message received with an erroneous SI (distribution function)
PURPOSE:  To check the response to a message received with an erroneous SI
PRE-TEST CONDITIONS:  Signalling linkset activated
CONFIGURATION:  A TYPE OF TEST:  VAT TYPE OF SP:  ALL
MESSAGE SEQUENCE:
SP  A SP  B
Link Link
<-------------------------       1 – 1 :Invalid SLTM
:(erroneous invalid SI)
TEST DESCRIPTION
1. Send an SLTM message with an invalid SI.
2. Check that no response is received except perhaps a UPU (cause unequipped) when the SI used does not exist.

Page 10
ETS 300 336: September 1996
Test number 3.21
Modify the test as follows:
TEST NUMBER:  3.21 PAGE:  1 of 1
REFERENCE:  Q.704 clause 5     Fig. 28, Fig. 29, Fig. 30
TITLE:  Changeover
SUBTITLE:  Reception of a changeover order on an available link
PURPOSE:  To check the changeover procedure on reception of a COO or ECO for a link in service
PRE-TEST CONDITIONS:  Linkset with two available links
CONFIGURATION:  A TYPE OF TEST:  VAT TYPE OF SP:  ALL
MESSAGE SEQUENCE:
SP  A SP  B
Link Link
:Start traffic
1 – 1 TRAFFIC ---------------------------------------------->
<---------------------------------------------- 1 – 1     TRAFFIC
1 – 2 TRAFFIC ---------------------------------------------->
<---------------------------------------------- 1 – 2     TRAFFIC
<---------------------------------------------- 1 – 2     COO, SLC 1 – 1
1 – 2     (FSN corresponding to
1 – 2     the last received message)
1 – 2 COA, SLC 1 – 1 ---------------------------------------------->
1 – 2 TRAFFIC ---------------------------------------------->
(from 1 – 1)
<---------------------------------------------- 1 – 2     TRAFFIC (from 1 – 1)
:Wait
:Stop traffic
TEST DESCRIPTION
1. Start traffic to B and C on all the links.
2. Send a COO from B to A for 1 – 1 on link 1 – 2 and check tha
...