SIST IEC 60839-7-4:2002

Alarm systems - Part 7-4: Message formats and protocols for serial data interfaces in alarm transmission systems - Common transport layer protocol

Specifies the transport layer message structure, formats and transmission procedures to be used at standard interfaces in alarm transmission systems. Should be used at all such interfaces where equipment from one supplier is intended to inter-work with equipment from other suppliers, and where the underlying system architecture does not provide the necessary facilities to support the common application layer.

Systèmes d'alarme - Partie 7-4: Formats de message et protocoles pour les interfaces de données série dans les systèmes de transmission d'alarme - Protocole de la couche commune de transport

Spécifie la structure des messages de la couche de transport, les formats et les procédures de transmission à utiliser au niveau des interfaces normalisées dans les systèmes de transmission d'alarme. Est à utiliser pour toutes les interfaces dans lesquelles le matériel provenant d'un fournisseur est destiné à travailler en liaison avec celui provenant d'autres fournisseurs, et dans lesquelles l'architecture sous-tendue du système ne donne pas les possibilités nécessaires pour supporter la couche d'application commune.

Alarm systems - Part 7-4: Message formats and protocols for serial data interfaces in alarm transmission systems - Common transport layer protocol

General Information

• Status: Withdrawn
• Publication Date: 31-May-2002
• Withdrawal Date: 20-Jun-2024
• ICS: 13.320 - Alarm and warning systems
• ICS: 35.100.40 - Transport layer
• Technical Committee: EAL - Alarm systems
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 21-Jun-2024
• Due Date: 14-Jul-2024
• Completion Date: 21-Jun-2024
• Directive: 2007-01-2231 - Pravilnik o določitvi varnostnih standardov poslovanja sodišč
• Ref Project: IEC 60839-7-4 - Alarm systems - Part 7-4: Message formats and protocols for serial data interfaces in alarm transmission systems - Common transport layer protocol

Overview

IEC 60839-7-4 specifies the common transport layer protocol for alarm transmission systems using serial data interfaces. It defines the transport-layer message structure, header fields, message formats and transmission procedures to enable interoperable communication between equipment from different suppliers. The standard follows OSI layering principles and applies to intrusion, fire, access control and social alarm systems where the underlying architecture does not provide the required application-layer facilities.

Key topics and requirements

• Transport layer header and flags: A one-octet flags field indicates presence of source/destination identities, whether the payload is an application message or a transport data block, and whether encryption/MAC or a special algorithm is used. Certain bits are reserved/required.
• Source/Destination identity format: IDs up to eight octets (maximum seven digits per octet) with a leading nibble indicating digit count; when both IDs are present the source ID precedes the destination ID.
• Message formatting: Application messages or transport-layer data blocks are wrapped with the defined transport header; annex A specifies the transport-layer messages and length/type/optional data structure.
• Authentication (keyed initialization):
  • Devices are provisioned with a master key (Mk).
  • Initialization uses random numbers (R1, R2, Rs) and a secondary key Ki negotiated during a challenge–response exchange to confirm identities.
  • Ki is stored only in non-volatile memory and is unique per originator.
  • Procedures for changing Ki and for handling synchronization failures are defined.
• Encryption and MAC:
  • Encryption applies to octets following the transport header; a Message Authentication Code (MAC) can be appended as a single octet.
  • Bit flags in the header indicate encrypted payloads and presence of MAC.
  • The physical management of authentication keys is out of scope.
• Standard algorithm: A block algorithm based on XOR and rotate operations with a random seed and Ki is defined for encryption and MAC generation; random numbers and keys are 8‑bit octets (values 00h and FFh excluded).

Applications and users

• Implementers of alarm transmission equipment (panels, communicators, receivers) needing interoperability across suppliers.
• System integrators and security product developers for intrusion, fire, access control, and social alarm systems using serial links.
• Firmware and protocol engineers implementing transport-layer services (encryption, MAC, identity handling) for compliant devices.
• Test and certification bodies validating conformance to transport-layer message formats and authentication procedures.

Related standards

• IEC 60839-7-1: General
• IEC 60839-7-2: Common application layer protocol
• IEC 60839-7-3: Common data link layer protocol
• IEC 60839-7-5 / 7-6 / 7-7 / 7-11 / 7-12 / 7-20: Other serial interface and signalling parts of the IEC 60839-7 series

Keywords: IEC 60839-7-4, alarm systems, transport layer protocol, message formats, serial data interfaces, encryption, authentication, MAC, interoperability, Ki, master key.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Alarm systems - Part 7-4: Message formats and protocols for serial data interfaces in alarm transmission systems - Common transport layer protocolSystèmes d'alarme - Partie 7-4: Formats de message et protocoles pour les interfaces de données série dans les systèmes de
transmission d'alarme - Protocole de la couche commune de
transportAlarm systems - Part 7-4: Message formats and protocols for
serial data interfaces in alarm transmission systems - Common transport layer protocol35.100.40Transportni slojTransport layer13.320Alarmni in opozorilni sistemiAlarm and warning systemsICS:Ta slovenski standard je istoveten z:IEC 60839-7-4SIST IEC 60839-7-4:2002en01-junij-2002SIST IEC 60839-7-4:2002SLOVENSKI
STANDARD
NORMEINTERNATIONALECEIIECINTERNATIONALSTANDARD60839-7-4Première éditionFirst edition2001-03Systèmes d'alarme –Partie 7-4:Formats de message et protocoles pourles interfaces de données série dansles systèmes de transmission d'alarme –Protocole de la couche commune de transportAlarm systems –Part 7-4:Message formats and protocols for serialdata interfaces in alarm transmission systems –Common transport layer protocol Commission Electrotechnique Internationale International Electrotechnical CommissionPour prix, voir catalogue en vigueurFor price, see current catalogue IEC 2001
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Copyright - all rights reservedAucune partie de cette publication ne peut être reproduite niutilisée sous quelque forme que ce soit et par aucun procédé,électronique ou mécanique, y compris la photocopie et lesmicrofilms, sans l'accord écrit de l'éditeur.No part of this publication may be reproduced or utilized inany form or by any means, electronic or mechanical,including photocopying and microfilm, without permission inwriting from the publisher.International Electrotechnical Commission3, rue de Varembé
Geneva, SwitzerlandTelefax: [phone]e-mail: [e-mail] IEC web site
http://www.iec.chCODE PRIXPRICE CODELSIST IEC 60839-7-4:2002

60839-7-4 © IEC:2001– 3 –CONTENTSFOREWORD.51Scope.92Normative references.93Definitions.94Abbreviations.95General.96Transport layer message format.116.1Transmission of transport layer data block.116.2Transport layer header.117Authentication.137.1Configuration.137.2Initialization.137.3Change of secondary key.157.4Failure of synchronization.157.5Size of keys.178Encryption.179Message authentication code (MAC).1710Standard algorithm.19Annex A (normative)
Transport layer messages.21SIST IEC 60839-7-4:2002

60839-7-4 © IEC:2001– 5 –INTERNATIONAL ELECTROTECHNICAL COMMISSION____________ALARM SYSTEMS –Part 7-4: Message formats and protocols for serial data interfacesin alarm transmission systems –Common transport layer protocolFOREWORD1)The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprisingall national electrotechnical committees (IEC National Committees). The object of the IEC is to promoteinternational co-operation on all questions concerning standardization in the electrical and electronic fields. Tothis end and in addition to other activities, the IEC publishes International Standards. Their preparation isentrusted to technical committees; any IEC National Committee interested in the subject dealt with mayparticipate in this preparatory work. International, governmental and non-governmental organizations liaisingwith the IEC also participate in this preparation. The IEC collaborates closely with the International Organizationfor Standardization (ISO) in accordance with conditions determined by agreement between the twoorganizations.2)The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, aninternational consensus of opinion on the relevant subjects since each technical committee has representationfrom all interested National Committees.3)The documents produced have the form of recommendations for international use and are published in the formof standards, technical specifications, technical reports or guides and they are accepted by the NationalCommittees in that sense.4)
In order to promote international unification, IEC National Committees undertake to apply IEC InternationalStandards transparently to the maximum extent possible in their national and regional standards. Anydivergence between the IEC Standard and the corresponding national or regional standard shall be clearlyindicated in the latter.5)
The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for anyequipment declared to be in conformity with one of its standards.6)
Attention is drawn to the possibility that some of the elements of this International Standard may be the subjectof patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.International Standard IEC 60839-7-4 has been prepared by IEC technical committee 79: Alarmsystems.This bilingual version (2001-11) replaces the English version.The text of this standard is based on the following documents:FDISReport on voting79/201/FDIS79/211/RVDFull information on the voting for the approval of this standard can be found in the report onvoting indicated in the above table.This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.Annex A forms an integral part of this standard.The committee has decided that the contents of this publication will remain unchangeduntil 2004. At this date, the publication will be•reconfirmed;•withdrawn;•replaced by a revised edition, or•amended.SIST IEC 60839-7-4:2002

60839-7-4 © IEC:2001– 7 –IEC 60839-7-4 forms one of a series of publications presented under the general title: Alarmsystems – Part 7: Message formats and protocols for serial data interfaces in alarmtransmission systems.IEC 60839-7-1:GeneralIEC 60839-7-2:Common application layer protocolIEC 60839-7-3:Common data link layer protocolIEC 60839-7-4:Common transport layer protocolIEC 60839-7-5:Alarm system interfaces employing a two-wire configuration in accordancewith ISO/IEC 8482IEC 60839-7-6:Alarm system interfaces employing ITU-T Recommendation V.24/V.28signallingIEC 60839-7-7:Alarm system interfaces for plug-in alarm system transceiversIEC 60839-7-11:Serial protocol for use by digital communicator systems using ITU-TRecommendation V.23 signalling at interfaces with the PSTNIEC 60839-7-12:PTT interfaces for dedicated communications using ITU-T RecommendationV.23 signallingIEC 60839-7-20:Terminal interfaces employing ITU-T Recommendation V.24/V.28 signallingSIST IEC 60839-7-4:2002

60839-7-4 © IEC:2001– 9 –ALARM SYSTEMS –Part 7-4: Message formats and protocols for serial data interfacesin alarm transmission systems –Common transport layer protocol1 ScopeThis part of IEC 60839 specifies the transport layer message structure, formats and trans-mission procedures to be used at standard interfaces in alarm transmission systems. Thisshould be used at all such interfaces where equipment from one supplier is intended to inter-work with equipment from other suppliers, and where the underlying system architecture doesnot provide the necessary facilities to support the common application layer.The structure follows the OSI recommendations for a layered protocol to allow flexibility in thechoice and use of lower level transmission media and protocols, whilst maintaining support forthe common application layer protocol.This standard applies equally to the transmission of alarms and other messages to/fromintrusion, fire, access control and social alarm systems, and to the transmission of informationto/from other similar systems.The physical management of the authentication keys required by this standard is not included.2 Normative referencesThe following referenced documents are indispensable for the application of this document. Fordated references, only the edition cited applies. For undated references, the latest edition ofthe referenced document (including any amendments) applies.IEC 60839-7-1, Alarm systems – Part 7-1: Message formats and protocols for serial datainterfaces in alarm transmission systems – General3 DefinitionsFor the purpose of this part of IEC 60839, the definitions in IEC 60839-7-1 apply.4 AbbreviationsThe abbreviations in IEC 60839-7-1 apply.5 GeneralThe transport layer is responsible for the formatting of messages from the application layer intoa form suitable for transmission to the remote location, and for the addition of facilities notavailable from the underlying transport mechanism.Although a link using this protocol may be point-multipoint, or multipoint-multipoint, thetransport layer described here presumes that such systems will comprise a number of logicalpoint-point communications which will proceed independently.SIST IEC 60839-7-4:2002

60839-7-4 © IEC:2001– 11 –In such communications, one device is defined as the ORIGINATOR and one as theRECEIVER in order that the standard may be defined generally. The calling standard shallidentify which of these functions is assigned to which equipment.6 Transport layer message formatEach application layer message or transport layer data block shall be formatted into transportlayer message with the addition of a header as defined below.6.1 Transmission of transport layer data blockTransport layer data shall be formatted
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