SIST ETS 300 008-1:1998

SLOVENSKI STANDARD
01-november-1998
'LJLWDOQRRPUHåMH]LQWHJULUDQLPLVWRULWYDPL,6'16LJQDOL]DFLMDãW6SRURþLOQR
SUHQRVQLGHO073]DSRGSRURPHGQDURGQHJDPHGVHERMQHJDSRYH]RYDQMD
GHO6SHFLILNDFLMDSURWRNRODSUHREOLNRYDQDSULSRURþLOD,78744
4GR44LQ4
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
...