SIST ETS 300 008-1:1998
(Main)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), modified]
- Abstract
Rebase ETS 300 008 on ITU-T White Book, combine with (stopped) prAmendments 1&2, and rectify problems in White Book.
- Status
- Published
- Publication Date
- 31-Oct-1998
- Technical Committee
- SPS - Signalling protocols and switching
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Nov-1998
- Due Date
- 01-Nov-1998
- Completion Date
- 01-Nov-1998
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SIST ETS 300 008-1:1998 is the Slovenian standard for the Message Transfer Part (MTP) of Signalling System No. 7 (SS7) in Integrated Services Digital Network (ISDN) international interconnection. It is an ETSI protocol specification for network operators, equipment suppliers, and test teams that need to implement or assess MTP behaviour at signalling points and transfer points.
What does SIST ETS 300 008-1:1998 specify?
SIST ETS 300 008-1:1998 defines the MTP protocol for use in the international network and, optionally, in public networks. It is written to support international interconnection and to fit alongside national networks rather than replace their own rules.
The document is Part 1 of the ETS 300 008 series. ETS 300 008-1 is organized as follows:
| Annex | What it covers |
|---|---|
| ZA | Specific requirements for signalling link loading |
| ZB | Bibliography |
The body of the standard applies global modifications to ITU-T Recommendations Q.701 to Q.708, then gives clause-by-clause changes for restart, timers, link management, congestion handling, message coding, and route testing.
What are the key requirements of SIST ETS 300 008-1:1998?
SIST ETS 300 008-1:1998 fixes the operating rules for international MTP traffic and the way implementations react during restart, changeover, congestion, and user-part unavailability. In practice, this is the part that tells an implementer what the network may assume, what messages must be generated, and which functions from the base ITU-T texts apply.
Network use and transport assumptions
The standard applies no national options. It also fixes the signalling data-link environment, including a standard bit rate for signalling links, a defined place for digital-to-analogue or analogue-to-digital conversion on analogue paths, and a single Network Indicator value for this ETS. This matters because equipment must match the same signalling assumptions at both ends of an international connection.
Restart and recovery behaviour
The standard modifies restart handling so that MTP informs local MTP Users when restart ends and signals whether each signalling point is accessible or inaccessible. It also defines how TRA and TFP/TFA-related procedures are used during recovery, including sequence diagrams for restarting signalling points and adjacent nodes. This matters when a network comes back after failure, because traffic must resume in a controlled order.
Timers and signalling link management
SIST ETS 300 008-1:1998 keeps the ITU-T timer framework but excludes some timers from Q.703 and Q.704. It also limits Q.704 to the basic signalling link management functions in subclause 12.2. This matters because an implementation only needs to support the timer and management behaviour that this ETS actually applies.
Routing, congestion, and unavailable user parts
The standard defines a combined link set, allows an alternative combined linkset to be formed from remaining link sets, and adjusts changeover and changeback behaviour to reduce message loss and sequencing errors. It also defines how transfer controlled messages and UPU messages are used, and it fixes service indicator and user part identity coding for the international signalling network. This matters for routing correctness and for identifying which user part a message belongs to.
Signalling link loading
Annex ZA defines signalling link load as an occupancy measure based on MSU traffic on a link, excluding retransmissions and certain supervisory units. It gives planning guidance for normal operation and abnormal conditions, and includes a graph relating message rate and SIF + SIO load. This matters for network dimensioning and capacity planning.
What terms does SIST ETS 300 008-1:1998 define?
- Destination Point Code (DPC) - the code that identifies the destination signalling point in MTP routing.
- Message Signal Unit (MSU) - the signalling unit that carries user or network management information across the MTP.
- Message Transfer Part (MTP) - the SS7 layer that transports and routes signalling messages between points.
- Signalling Transfer Point (STP) - a signalling point that relays MTP traffic between other signalling points.
- Signalling Information Field (SIF) - the part of the signalling unit that carries the information being transferred.
- Service Information Octet (SIO) - the octet that identifies the service and user part for message handling.
- Transfer Prohibited message (TFP) - a network management message that announces that transfer to a destination is prohibited.
- Traffic Restart Allowed message (TRA) - a restart-related message used when traffic may resume after recovery.
Who uses SIST ETS 300 008-1:1998?
Telecom operators, SS7 and ISDN network engineers, switch and signalling-equipment manufacturers, and conformance test laboratories use SIST ETS 300 008-1:1998. They use it to implement MTP behaviour, plan signalling links, assign message and user-part codes, and verify restart, congestion, and routing procedures for international interconnection.
What changed in SIST ETS 300 008-1:1998 from the previous edition?
SIST ETS 300 008-1:1998 is the second edition of ETS 300 008-1 and updates the earlier first edition. The scope states that it rebases ETS 300 008 on the ITU-T White Book, combines it with the stopped prAmendments 1 and 2, and rectifies problems in the White Book text. The foreword also says that modified text is marked by sidebars, underlining, and strike-out.
Which standards are used with SIST ETS 300 008-1:1998?
- ITU-T Recommendations Q.701 (1993), Q.702 (1988), Q.703 to Q.706 (1993), Q.707 (1988), and Q.708 (1993) - the base MTP clauses that this ETS modifies for European use.
- ETS 300 008-2 - the companion part for the Protocol Implementation Conformance Statement (PICS) proforma specification.
- ETS 300 008-3 - the companion part for the Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification.
What does the SIST ETS 300 008-1:1998 document contain?
SIST ETS 300 008-1:1998 contains global modifications to the ITU-T Q.701 to Q.708 material, followed by specific changes to restart, timer use, signalling link management, changeover and changeback, congestion handling, route-set testing, and message coding. It includes code assignment tables for service indicators and user part identities, and a note on reserved codes. Annex ZA adds a graphical method for reading signalling link loading, while Annex ZB gives a bibliography entry for ITU-T Recommendation Q.709.
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Frequently Asked Questions
SIST ETS 300 008-1:1998 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "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), modified]". This standard covers: Rebase ETS 300 008 on ITU-T White Book, combine with (stopped) prAmendments 1&2, and rectify problems in White Book.
Rebase ETS 300 008 on ITU-T White Book, combine with (stopped) prAmendments 1&2, and rectify problems in White Book.
SIST ETS 300 008-1:1998 is classified under the following ICS (International Classification for Standards) categories: 33.080 - Integrated Services Digital Network (ISDN). The ICS classification helps identify the subject area and facilitates finding related standards.
SIST ETS 300 008-1:1998 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
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) to support international interconnection; Part 1: Protocol specification [ITU-T Recommendations Q.701 (1993), Q.702 (1988), Q.703 to Q.706 (1993), modified]33.080Digitalno omrežje z integriranimi storitvami (ISDN)Integrated Services Digital Network (ISDN)ICS:Ta slovenski standard je istoveten z:ETS 300 008-1 Edition 23SIST ETS 300 008-1:1998en01-IHEUXDU-19983SIST ETS 300 008-1:1998SLOVENSKI
STANDARD
EUROPEANETS 300 008-1TELECOMMUNICATIONJanuary 1997STANDARDSecond EditionSource: ETSI TC-SPSReference: DE/SPS-02033ICS:33.080Key words:ISDN, SS7, MTPIntegrated 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]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: secretariat@etsi.frTel.: +33 4 92 94 42 00 - Fax: +33 4 93 65 47 16Copyright 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 1997. All rights reserved.SIST ETS 300 008-1:1998
Page 2ETS 300 008-1: January 1997ForewordThis European Telecommunication Standard (ETS) has been produced by the Signalling Protocols andSwitching (SPS) Technical Committee of the European Telecommunications Standards Institute (ETSI).The second edition of ETS 300 008 covering the Signalling System No.7 Message Transfer Part (MTP)signalling protocol to support international interconnection is structured as a multi-part standard (of whichthis ETS forms part 1) as described below:Part 1:"Protocol specification [ITU-T Recommendations Q.701 (1993), Q.702 (1988), Q.703 toQ.706 (1993), Q.707 (1988) and Q.708 (1993), modified]";Part 2:"Protocol Implementation Conformance Statement (PICS) proforma specification";Part 3:"Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing(PIXIT) proforma specification".Transposition datesDate of adoption20 December 1996Date of latest announcement of this ETS (doa):30 April 1997Date of latest publication of new National Standardor endorsement of this ETS (dop/e):31 October 1997Date of withdrawal of any conflicting National Standard (dow):31 October 1997Endorsement noticeThe text of ITU-T Recommendations Q.701 (1993), Q.702 (1988), Q.703 to Q706 (1993), Q.707 (1988)and Q.708 (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.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 300 008-1:1998
Page 3ETS 300 008-1: January 1997Global modifications to ITU-T Recommendations Q.701 to Q.708Insert the following two clauses (scope and abbreviations):ScopeThis first part of ETS 300 008 defines the Message Transfer Part (MTP) protocol of Signalling SystemNo.7 for application in the international network and, optionally, in public networksThis ETS is applicable to the international network and is not meant to restrict national networks.AbbreviationsFor the purposes of this ETS, the following abbreviations apply:DPCDestination Point CodeISDNIntegrated Services Digital NetworkLSSULink Status Signal UnitMSUMessage Signal UnitMTPMessage Transfer PartPSTNPublic Switched Telecommunications NetworkSIFSignalling Information FieldSIOService Information OctetSPSignalling PointSTPSignalling Transfer PointTFPTransfer Prohibited messageTRATraffic Restart Allowed messageUPUUser Part Unavailable messageThe following exceptions to ITU-T Recommendations Q.701 to Q.708 shall apply:National optionsNo national options, or remarks with regard to national options, shall apply to this ETS.Signalling data linksA standard bit rate of 64 kbit/s on signalling data links shall apply.If signalling data links are to be provided over an analogue transmission path, any necessary digital toanalogue or analogue to digital conversion shall be on the multiplexed transmission link after interfacepoint C, as defined in figure 2/Q.702.Network IndicatorOnly the value 00 shall be used for the Network Indicator.SIST ETS 300 008-1:1998
Page 4ETS 300 008-1: January 1997Modifications to ITU-T Recommendation Q.701Page 20, subclause 8.5Modify the text as follows:When the MTP restart procedure is terminated (i.e. when the TRA messages have been broadcast), theMTP indicates the end of MTP restart to all local MTP Users showing each signalling point’s accessibilityor inaccessibility. The means of doing this is implementation dependent (see 9/Q.704).Modifications to ITU-T Recommendation Q.703Timer valuesThe timer values included in ITU-T Recommendations Q.703 shall apply with the following exceptions:T1 (4,8 kbit/s), T2 low, T2 high, T4n (4,8 kbit/s), T4e (4,8 kbit/s), T6 (4,8 kbit/s) and T7 (4,8 kbit/s) shallnot apply for this ETS.SIST ETS 300 008-1:1998
Page 5ETS 300 008-1: January 1997Modifications to ITU-T Recommendation Q.704Timer valuesThe timer values included in ITU-T Recommendations Q.704 shall apply with the following exceptions:T7, T11, T15, T16 and T24 shall not apply for this ETS.Signalling link managementOf the requirements in ITU-T Recommendation Q.704, only the basic signalling link managementfunctions of subclause 12.2 shall apply, while subclauses 12.3 to 12.6 shall not apply.Page 6, subclause 2.3.2, fourth lineModify the fourth line as follows:A load sharing collection of two or more link sets is called a combined link set.Page 25, subclause 4.2.1, third paragraph, second sentenceModify the second sentence as follows:An alternative combined linkset may consist of two or more (or all) of the remaining available link sets,which may carry signalling traffic towards the concerned destination.Page 31, subclause 5.6.2, fifth paragraph, first sentenceModify the first sentence as follows:If time-controlled changeover has been initiated according to case ii) above and if a changeover order isreceived from the remote end and during the Time T1, it is advantageous to switch to the normalchangeover procedure including retrieval because unnecessary message loss or sending of old messagesis avoided in a simple way.Page 32, subclause 5.6.2, sixth paragraph, fourth sentenceModify the fourth sentence as follows:The decision whether processor outage is of long-term is a local one.Page 33, subclause 6.2.5, first paragraph, second sentenceModify the second sentence as follows:This is done also when the concerned signalling point is accessible, but there is no signalling route to itusing the same outgoing signalling link(s) (or one of the same signalling links) from which traffic will bediverted.Page 34, subclause 6.3Add the following note at the end of subclause 6.3:NOTE:The sequence control procedure during changeback can only guarantee correctsequencing of MSUs in all cases if the alternative link terminates in the same signallingpoint (i.e. the destination of the changeback declaration) as the newly available one.SIST ETS 300 008-1:1998
Page 6ETS 300 008-1: January 1997Page 42, subclause 9.7.1Replace the sequence diagram by:MTPUserrestartingSPtime > ~T1all links unavailable (e.g. LPO)first link in service at level 2TFP , TRA messagesTFA negating previous TFPsufficient links availableTFP , TRA messagesTFA negating previous TFPenough TRA messages receivedor T18 expiryTFP
broadcastlate availability of link, or TFA ,or TFP , or TRA receivedlast TFP , or T20 expiryenough TRAs received,or T20 expiryMTP-RESUMEindicationsTRA broadcast overdirect linksetsTFAs broadcast due to late availabilityof link, or late receipt of TFASPis anSTP?NoYesSPis anSTP?NoYesT19sT20T20T18T20SIST ETS 300 008-1:1998
Page 7ETS 300 008-1: January 1997Page 43, subclause
...
SLOVENSKI STANDARD
01-november-1998
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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), modified]
Ta slovenski standard je istoveten z: ETS 300 008-1 Edition 2
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 300 008-1
TELECOMMUNICATION January 1997
STANDARD Second Edition
Source: ETSI TC-SPS Reference: DE/SPS-02033
ICS: 33.080
Key words: ISDN, SS7, MTP
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]
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat@etsi.fr
Tel.: +33 4 92 94 42 00 - Fax: +33 4 93 65 47 16
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1997. All rights reserved.
Page 2
ETS 300 008-1: January 1997
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).
The second edition of ETS 300 008 covering the Signalling System No.7 Message Transfer Part (MTP)
signalling protocol to support international interconnection is structured as a multi-part standard (of which
this ETS forms part 1) as described below:
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]";
Part 2: "Protocol Implementation Conformance Statement (PICS) proforma specification";
Part 3: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing
(PIXIT) proforma specification".
Transposition dates
Date of adoption 20 December 1996
Date of latest announcement of this ETS (doa): 30 April 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 October 1997
Date of withdrawal of any conflicting National Standard (dow): 31 October 1997
Endorsement notice
The text of ITU-T Recommendations Q.701 (1993), Q.702 (1988), Q.703 to Q706 (1993), Q.707 (1988)
and Q.708 (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.
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 300 008-1: January 1997
Global modifications to ITU-T Recommendations Q.701 to Q.708
Insert the following two clauses (scope and abbreviations):
Scope
This first part of ETS 300 008 defines the Message Transfer Part (MTP) protocol of Signalling System
No.7 for application in the international network and, optionally, in public networks
This ETS is applicable to the international network and is not meant to restrict national networks.
Abbreviations
For the purposes of this ETS, the following abbreviations apply:
DPC Destination Point Code
ISDN Integrated Services Digital Network
LSSU Link Status Signal Unit
MSU Message Signal Unit
MTP Message Transfer Part
PSTN Public Switched Telecommunications Network
SIF Signalling Information Field
SIO Service Information Octet
SP Signalling Point
STP Signalling Transfer Point
TFP Transfer Prohibited message
TRA Traffic Restart Allowed message
UPU User Part Unavailable message
The following exceptions to ITU-T Recommendations Q.701 to Q.708 shall apply:
National options
No national options, or remarks with regard to national options, shall apply to this ETS.
Signalling data links
A standard bit rate of 64 kbit/s on signalling data links shall apply.
If signalling data links are to be provided over an analogue transmission path, any necessary digital to
analogue or analogue to digital conversion shall be on the multiplexed transmission link after interface
point C, as defined in figure 2/Q.702.
Network Indicator
Only the value 00 shall be used for the Network Indicator.
Page 4
ETS 300 008-1: January 1997
Modifications to ITU-T Recommendation Q.701
Page 20, subclause 8.5
Modify the text as follows:
When the MTP restart procedure is terminated (i.e. when the TRA messages have been broadcast), the
MTP indicates the end of MTP restart to all local MTP Users showing each signalling point’s accessibility
or inaccessibility. The means of doing this is implementation dependent (see 9/Q.704).
Modifications to ITU-T Recommendation Q.703
Timer values
The timer values included in ITU-T Recommendations Q.703 shall apply with the following exceptions:
T1 (4,8 kbit/s), T2 low, T2 high, T4n (4,8 kbit/s), T4e (4,8 kbit/s), T6 (4,8 kbit/s) and T7 (4,8 kbit/s) shall
not apply for this ETS.
Page 5
ETS 300 008-1: January 1997
Modifications to ITU-T Recommendation Q.704
Timer values
The timer values included in ITU-T Recommendations Q.704 shall apply with the following exceptions:
T7, T11, T15, T16 and T24 shall not apply for this ETS.
Signalling link management
Of the requirements in ITU-T Recommendation Q.704, only the basic signalling link management
functions of subclause 12.2 shall apply, while subclauses 12.3 to 12.6 shall not apply.
Page 6, subclause 2.3.2, fourth line
Modify the fourth line as follows:
A load sharing collection of two or more link sets is called a combined link set.
Page 25, subclause 4.2.1, third paragraph, second sentence
Modify the second sentence as follows:
An alternative combined linkset may consist of two or more (or all) of the remaining available link sets,
which may carry signalling traffic towards the concerned destination.
Page 31, subclause 5.6.2, fifth paragraph, first sentence
Modify the first sentence as follows:
If time-controlled changeover has been initiated according to case ii) above and if a changeover order is
received from the remote end and during the Time T1, it is advantageous to switch to the normal
changeover procedure including retrieval because unnecessary message loss or sending of old messages
is avoided in a simple way.
Page 32, subclause 5.6.2, sixth paragraph, fourth sentence
Modify the fourth sentence as follows:
The decision whether processor outage is of long-term is a local one.
Page 33, subclause 6.2.5, first paragraph, second sentence
Modify the second sentence as follows:
This is done also when the concerned signalling point is accessible, but there is no signalling route to it
using the same outgoing signalling link(s) (or one of the same signalling links) from which traffic will be
diverted.
Page 34, subclause 6.3
Add the following note at the end of subclause 6.3:
NOTE: The sequence control procedure during changeback can only guarantee correct
sequencing of MSUs in all cases if the alternative link terminates in the same signalling
point (i.e. the destination of the changeback declaration) as the newly available one.
Page 6
ETS 300 008-1: January 1997
Page 42, subclause 9.7.1
Replace the sequence diagram by:
restarting
User
SP MTP
all links unavailable (e.g. LPO )
tim e > ~T1
first link in service at level 2
T20
SP
No
is an TFP , TRA m essages
STP
?
TFA negating previous TFP
Yes
T18
sufficient links available
TFP , TRA m essages
TFA negating previous TFP
enough TRA m essages received
or T18 expiry
SP
No is an
STP
?
Yes
T20
T20
TFP broadcast
late availability of link,
enough TRAs received,
or TFA ,or TFP , or TRA received
or T20 expiry
last TFP , or T20 expiry
MTP-RESUME TRA broadcast over
indications direct linksets
TFAs broadcast due to late availab
...