SIST-TS CLC/TS 50131-5-1:2021

Alarm systems - Intrusion systems - Part 5-1: Interconnections - Requirements for wired Interconnection for I&HAS equipments located in supervised premises

This document applies to interconnections between intrusion and hold-up alarm system components using specific or non-specific wired interconnections (e.g. between SPT and CIE). The interconnected components are located within the supervised premises, or mounted on the outside of the supervised premises (e.g. external warning devices).
This document does not apply to interconnections between components located within the same enclosure, or to interconnections between parts of an I&HAS component if covered by the relevant product standard. This document does not define the physical requirements of the interconnection media.
This document is expected to be used in conjunction with the other parts of the EN 50131 series that define the functional requirements of the equipment regardless of the interconnection technique used.
Where monitoring of the functionality of the interconnections is undertaken by an interconnected component, this is defined in the relevant product standard in the EN 50131 series. If a component standard indicates that an interconnection will be monitored, then this document determines the monitored conditions applicable to the interconnection.
NOTE 1   For example, if there is no requirement in a detector standard to monitor a remote indication of detection input, this document does not apply to that particular interconnection.
Requirements for the monitoring of the functionality of power connections between I&HAS components are defined in the relevant product standard and are not included within this document.
This document defines the terms used in the field of intrusion and hold-up alarm equipment using such interconnections and includes the requirements relevant to the equipment interfaces.
Wired interconnection media can include metallic single stranded insulated cable, metallic multi-stranded insulated cable, and fibre optic cable. These cables can comprise single or multiple cores.
NOTE 2    Interconnections using RF techniques (i.e. wire free interconnections) are dealt with by EN 50131 5 3.

Alarmanlagen - Einbruch- und Überfallmeldeanlagen - Teil 5-1: Verbindungen - Anforderungen an leitungsgebundene Verbindungen für EMA/ÜMA Einrichtungen in überwachten Objekten

Systèmes d'alarme - Systèmes d'alarme contre l'intrusion - Partie 5-1 : Interconnexions - Exigences pour l'interconnexion filaire des équipements contre l'intrusion et les hold-up situés dans des locaux sous surveillance

Alarmni sistemi - Sistemi za javljanje vloma - 5-1. del: Povezave - Zahteve za žične povezave za I&HAS opremo nameščeno v nadzorovanih prostorih

General Information

• Status: Published
• Publication Date: 08-Mar-2021
• ICS: 13.310 - Protection against crime
• ICS: 13.320 - Alarm and warning systems
• Technical Committee: EAL - Alarm systems
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 05-Mar-2021
• Due Date: 10-May-2021
• Completion Date: 09-Mar-2021
• Ref Project: CLC/TS 50131-5-1:2021 - Alarm systems - Intrusion systems - Part 5-1: Interconnections - Requirements for wired Interconnection for I&HAS equipments located in supervised premises

Overview

CLC/TS 50131-5-1:2021 is a CENELEC technical specification for alarm systems - intrusion systems that defines requirements for wired interconnection of Intrusion & Hold‑Up Alarm System (I&HAS) components located in supervised premises. Published in 2021, it complements the EN 50131 product standards by focusing on the integrity, availability and verification of wired links (e.g., between sensors, control equipment and external warning devices). The document covers metallic and fibre‑optic wired media and clarifies which interconnections are in scope (inter-unit wiring within supervised premises) and which are excluded (connections inside the same enclosure or functions already covered by a product standard).

Key Topics and Requirements

• Scope & applicability: Applies to specific and non‑specific wired interconnections for I&HAS components located on or within supervised premises; excludes intra‑enclosure wiring and RF/wire‑free interconnections (see EN 50131‑5‑3).
• Interconnection integrity: Requirements to detect and respond to faults, cuts or tampering that affect wired links.
• Availability and verification: Monitoring techniques and maximum permitted intervals for periodic communications (message‑based) and availability monitoring (signal‑based).
• Message vs. signal approaches: Distinguishes message‑based (specific) interconnections that carry digital messages from signal‑based (non‑specific) circuits and prescribes different monitoring and test regimes.
• Message/signal integrity: Protection against modification, shorting, or cross‑core faults that could alter alarm messages or sensor signals.
• Test methods: Detailed test procedures (Section 5) for scenarios such as cutting all cores, cutting a single core, shorting all cores or pairs, degradation simulation, availability checks and pass/fail criteria.
• Cable types: Applicable to metallic single/multi‑stranded insulated cables and fibre optic cable (single/multi‑core); the TS does not define physical cable construction.

Applications and Users

This specification is practical for:

• Manufacturers designing control panels, detectors and external warning devices to meet interconnection integrity requirements.
• System designers & integrators specifying wired layouts and monitoring strategies for commercial, retail and institutional supervised premises.
• Testing laboratories and certification bodies carrying out the Section 5 interconnection tests.
• Security consultants and installers who must ensure wired I&HAS installations meet EN 50131 system requirements for reliability and tamper detection.

Keywords: CLC/TS 50131-5-1:2021, alarm systems, intrusion systems, wired interconnection, I&HAS, EN 50131, supervised premises, interconnection monitoring, signal-based, message-based.

Related Standards

• EN 50131 series (product functional requirements)
• EN 50131‑5‑3 (RF / wire‑free interconnections)
• Relevant product standards within EN 50131 that specify monitored functions and power‑connection monitoring.

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2021
Alarmni sistemi - Sistemi za javljanje vloma - 5-1. del: Povezave - Zahteve za žične
povezave za I&HAS opremo nameščeno v nadzorovanih prostorih
Alarm systems - Intrusion systems - Part 5-1: Interconnections - Requirements for wired
Interconnection for I&HAS equipments located in supervised premises
Ta slovenski standard je istoveten z: CLC/TS 50131-5-1:2021
ICS:
13.310 Varstvo pred kriminalom Protection against crime
13.320 Alarmni in opozorilni sistemi Alarm and warning systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION CLC/TS 50131-5-1

SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
February 2021
ICS 13.320
English Version
Alarm systems - Intrusion systems - Part 5-1: Interconnections -
Requirements for wired Interconnection for I&HAS equipments
located in supervised premises
Alarmanlagen - Einbruch- und Überfallmeldeanlagen - Teil Alarmanlagen - Einbruch- und Überfallmeldeanlagen - Teil
5-1: Verbindungen - Anforderungen an leitungsgebundene 5-1: Verbindungen - Anforderungen an leitungsgebundene
Verbindungen für EMA/ÜMA Einrichtungen in überwachten Verbindungen für EMA/ÜMA Einrichtungen in überwachten
Objekten Objekten
This Technical Specification was approved by CENELEC on 2021-01-11.

CENELEC members are required to announce the existence of this TS in the same way as for an EN and to make the TS available promptly
at national level in an appropriate form. It is permissible to keep conflicting national standards in force.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. CLC/TS 50131-5-1:2021 E

Contents
European foreword . 5
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviations . 7
3.1 Terms and definitions . 7
3.2 Abbreviations . 8
4 Requirements . 8
4.1 General . 8
4.1.1 Introduction . 8
4.1.2 Interconnection Integrity . 9
4.1.3 Availability . 10
4.1.4 Verification of communications . 11
4.1.5 Message/signal Integrity . 12
4.2 Response to monitoring . 12
4.3 Systems using more than one type of interconnection. 13
4.4 Supplementary components of I&HAS . 13
4.5 Supplementary functions of I&HAS . 13
5 Tests . 13
5.1 General . 13
5.1.1 Tests for Interconnections . 13
5.1.2 Standard laboratory conditions for testing . 14
5.1.3 General testing environment and procedures . 14
5.1.4 Test procedures defined within component standards . 15
5.2 Verification of normal communications test . 15
5.2.1 Principle . 15
5.2.2 Test conditions . 15
5.2.3 Mounting . 15
5.2.4 Procedure . 15
5.2.5 Pass/Fail criteria . 15
5.3 Cutting of all cores (signal based) . 15
5.3.1 Principle . 15
5.3.2 Test conditions . 15
5.3.3 Mounting . 15
5.3.4 Procedure . 16
5.3.5 Pass/Fail criteria . 16
5.4 Cut of any one core (signal based) . 16
5.4.1 Principle . 16
5.4.2 Test conditions . 16
5.4.3 Mounting . 16
5.4.4 Procedure . 16
5.4.5 Pass/Fail criteria . 17
5.5 Short all cores (signal based) . 17
5.5.1 Principle . 17
5.5.2 Test conditions . 17
5.5.3 Mounting . 17
5.5.4 Procedure . 17
5.5.5 Pass/Fail criteria . 17
5.6 Short any pair of cores (signal based) . 17
5.6.1 Principle . 17
5.6.2 Test conditions . 17
5.6.3 Mounting . 18
5.6.4 Procedure . 18
5.6.5 Pass/Fail criteria . 18
5.7 Cutting of all cores (message based – specific) . 18
5.7.1 Principle . 18
5.7.2 Test conditions . 18
5.7.3 Mounting . 18
5.7.4 Procedure . 18
5.7.5 Pass/Fail criteria . 19
5.8 Cut of any one core (message based – specific) . 19
5.8.1 Principle . 19
5.8.2 Test conditions . 19
5.8.3 Mounting . 19
5.8.4 Procedure . 19
5.8.5 Pass/Fail criteria . 19
5.9 Short all cores (message based – specific) . 19
5.9.1 Principle . 19
5.9.2 Test conditions . 19
5.9.3 Mounting . 19
5.9.4 Procedure . 20
5.9.5 Pass/Fail criteria . 20
5.10 Short any pair of cores (message based – specific) . 20
5.10.1 Principle . 20
5.10.2 Test conditions . 20
5.10.3 Mounting . 20
5.10.4 Procedure . 20
5.10.5 Pass/Fail criteria . 20
5.11 Availability monitoring (signal based – non-specific) . 21
5.11.1 Principle . 21
5.11.2 Test conditions . 21
5.11.3 Mounting . 21
5.11.4 Procedure . 21
5.11.5 Pass/Fail criteria . 21
5.12 Availability monitoring (message based – non-specific) . 21
5.12.1 Principle . 21
5.12.2 Test conditions . 21
5.12.3 Mounting . 21
5.12.4 Procedure . 21
5.12.5 Pass/Fail criteria . 22
5.13 Interconnection degradation (signal based). 22
5.13.1 Principle . 22
5.13.2 Test conditions . 22
5.13.3 Mounting . 22
5.13.4 Procedure . 22
5.13.5 Pass/Fail criteria . 22
5.14 Maximum permitted intervals between periodic communications (message based) . 22
5.14.1 Principle . 22
5.14.2 Test conditions . 23
5.14.3 Mounting . 23
5.14.4 Procedure . 23
5.14.5 Pass/Fail criteria . 23
5.15 Modification of signal (signal based) . 23
5.15.1 Principle . 23
5.15.2 Test conditions . 23
5.15.3 Mounting . 23
5.15.4 Procedure . 23
5.15.5 Pass/Fail criteria . 24
5.16 Modification of message (message based) . 24
5.16.1 Principle . 24
5.16.2 Test conditions . 24
5.16.3 Mounting . 24
5.16.4 Procedure . 24
5.16.5 Pass/Fail criteria . 24
Annex A (informative) Summary of requirements by interconnection type . 25
Bibliography . 26

European foreword
This document (CLC/TS 50131-5-1:2021) has been prepared by CLC/TC 79 “Alarm systems”.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Introduction
The wired interconnection forms the link between I&HAS components to transfer information and, where
appropriate, power, as required for reliable system operation.
The transfer of information may be by means of signals or messages as appropriate to the I&HAS and its
security grade.
Selection of the type of interconnection media and its installation can affect the reliability and grade of the
I&HAS.
Interconnections may be dedicated to a single I&HAS (specific interconnections) or shared with one or more
alarm or other systems (non-specific interconnections). The relative priorities of the different systems are
determined according to EN 50398-1.
1 Scope
This document applies to interconnections between intrusion and hold-up alarm system components using
specific or non-specific wired interconnections (e.g. between SPT and CIE). The interconnected components
are located within the supervised premises, or mounted on the outside of the supervised premises (e.g. external
warning devices).
This document does not apply to interconnections between components located within the same enclosure, or
to interconnections between parts of an I&HAS component if covered by the relevant product standard. This
document does not define the physical requirements of the interconnection media.
This document is expected to be used in conjunction with the other parts of the EN 50131 series that define the
functional requirements of the equipment regardless of the interconnection technique used.
Where monitoring of the functionality of the interconnections is undertaken by an interconnected component,
this is defined in the relevant product standard in the EN 50131 series. If a component standard indicates that
an interconnection will be monitored, then this document determines the monitored conditions applicable to the
interconnection.
NOTE 1 For example, if there is no requirement in a detector standard to monitor a remote indication of detection input,
this document does not apply to that particular interconnection.
Requirements for the monitoring of the functionality of power connections between I&HAS components are
defined in the relevant product standard and are not included within this document.
This document defines the terms used in the field of intrusion and hold-up alarm equipment using such
interconnections and includes the requirements relevant to the equipment interfaces.
Wired interconnection media can include metallic single stranded insulated cable, metallic multi-stranded
insulated cable, and fibre optic cable. These cables can comprise single or multiple cores.
NOTE 2 Interconnections using RF techniques (i.e. wire free interconnections) are dealt with by EN 50131-5-3.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references, the
latest edition of the referenced document (including any amendments) applies.
EN 50131-1, Alarm systems - Intrusion and hold-up systems - Part 1: System requirements
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 50131-1 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1.1
core
physical element within the wired interconnection media that carries the signal, message or power
Note 1 to entry: There is no requirement that a core should consist of a metallic element.
3.1.2
interconnection degradation
intentional or unintentional change to the characteristics of the wired interconnection media which could prevent
the ability to pass signals or messages from the source to the destination
EXAMPLE due to changes in resistance or opacity
3.1.3
interconnection unavailability
when conditions are such that an interconnection meeting the integrity requirements cannot convey I&HAS
system signals or messages
EXAMPLE When an I&HAS shares a BUS system with other applications and that other application has taken
permanent control of the BUS.
3.1.4
loss of a message
message that has not been received within the expected time (as defined in the message protocol), or has been
received but is not readable
3.1.5
modification
intentional or unintentional alteration, substitution, addition, deletion or loss of a message or signal, which could
prevent the correct operation of an I&HAS
3.1.6
supplementary components
components of other applications which may be combined or integrated within the I&HAS providing the
performance of the I&HAS or any of its components is not adversely influenced
3.1.7
supplementary functions
other functions of I&HAS components that do not affect the correct detection, processing or notification function
of an I&HAS
EXAMPLE non-mandatory indications
3.1.8
wired interconnection
physical means by which messages and/or signal and/or power are communicated between components
3.1.9
wired interconnection media
physical media by which signals or messages and/or power are conveyed which may comprise single or multiple
cores within an outer sheath
3.2 Abbreviations
EUT Equipment Under Test
4 Requirements
4.1 General
4.1.1 Introduction
Wired interconnections shall be suitable for the purpose and designed to provide a reliable means of
communication and/or power between I&HAS components.
A wired interconnection shall be available when needed to convey signals or messages and/or power between
components, or between physically separate (i.e. housed in different enclosures) parts of a single component
(e.g. CIE) during all states of the system: unset, setting, set, un-setting.
Selection of the type of interconnection media and its installation can affect the reliability and security grade of
the I&HAS and should be made in accordance with the I&HAS components manufacturers’ specifications and
the principles contained in TS50131-7.
NOTE For clarity, Annex A contains a summary of interconnection requirements for each interconnection type.
4.1.2 Interconnection Integrity
4.1.2.1 General
The following requirements relate to the physical integrity of the interconnection between the I&HAS
components.
4.1.2.2 Signal based interconnections
Signal-based interconnections shall be monitored such that any of the conditions identified in Table 1 will be
detected and processed within 10 s of the condition occurring.
Table 1 — Integrity monitoring of wired signal-based interconnections
Conditions: G1 G2 G3 G4
Unset Unset Unset Unset
c c c c
Set Set Set Set
c c c c
a d d
M Op M M M M
Cut of all cores M M
Cut of any one core
b,d d
Op Op M M M M
M M
a
a d
Op Op Op Op M M M
Short all cores M
Short of any pair of d
M
Op Op Op Op M M M
a
cores
Key: M = Mandatory, Op = Optional
a
This refers to only those cores used to pass the signal between any two system components.
b
Only mandatory for the tamper core(s).
c
In Table 1, Setting is treated as a system in the Unset state, and Unsetting is treated as a system in the Set
state
d
Optional during UNSET, but not during SETTING, for components installed in systems meeting the
requirements of EN 50131–1 “Monitoring of interconnections (Coerciveness Principle)”
4.1.2.3 Message based interconnections
Message-based interconnections shall be monitored such that any of the conditions identified in Table 2 that
result in loss of communication will be detected within 10 s of the condition occurring.
Compliance may be demonstrated either by electrical tests or by the monitoring of the receipt of messages
provided that the 10 s requirement is
...