EN 50131-5-3:2005

SLOVENSKI STANDARD
01-oktober-2005
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Alarm systems - Intrusion systems -- Part 5-3: Requirements for interconnections
equipment using radio frequency techniques
Alarmanlagen - Einbruchmeldeanlagen -- Teil 5-3: Anforderungen an
Übertragungsgeräte, die Funkfrequenz-Techniken verwenden
Systèmes d'alarme - Systèmes d'alarme intrusion -- Partie 5-3: Exigences pour les
équipements d'alarme intrusion utilisant des techniques radio
Ta slovenski standard je istoveten z: EN 50131-5-3:2005
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.

EUROPEAN STANDARD EN 50131-5-3
NORME EUROPÉENNE
EUROPÄISCHE NORM May 2005
ICS 13.310
English version
Alarm systems -
Intrusion systems
Part 5-3: Requirements for interconnections equipment
using radio frequency techniques

Systèmes d'alarme -  Alarmanlagen -
Systèmes d'alarme intrusion Einbruchmeldeanlagen
Partie 5-3: Exigences pour les équipements Teil 5-3: Anforderungen an
d'alarme intrusion utilisant Übertragungsgeräte,
des techniques radio die Funkfrequenz-Techniken verwenden

This European Standard was approved by CENELEC on 2005-03-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.

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

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 50131-5-3:2005 E
Foreword
This European Standard was prepared by the Technical Committee CENELEC TC 79, Alarm systems.
The text of the draft was submitted to the formal vote and was approved by CENELEC as
EN 50131-5-3 on 2005-03-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2006-03-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-03-01
––––––––––––
– 3 – EN 50131-5-3:2005
Contents
1 Scope . 5
2 Normative references . 5
3 Definitions and abbreviations . 5
3.1 Definitions. 5
3.2 Abbreviations . 7
4 General requirements. 7
4.1 Immunity to attenuation. 7
4.2 Immunity to collision . 7
4.2.1 Requirement for collision rate. 7
4.2.2 Requirement for throughput ratio . 8
4.3 Immunity to unintentional and intentional component and message substitution. 8
4.3.1 Immunity to unintentional and intentional components substitution . 9
4.3.2 Immunity to intentional message substitution. 9
4.4 Immunity to interference. 9
4.4.1 Interference outside of the assigned band for grades 1 and 2 equipment. 9
4.4.2 Interference within the assigned band for grades 1 and 2 equipment. 10
4.4.3 Interference for grades 3 and 4 . 10
4.5 Requirement for RF links monitoring. 10
4.5.1 Requirement for the detection of a failure of periodic communication. 10
4.5.2 Requirement for the detection of interference. 11
4.6 Requirements for antennas. 12
5 Tests. 13
5.1 RF disturbance tests. 13
5.1.1 Reference level determination. 13
5.1.2 Test for immunity to attenuation . 13
5.1.3 Verification of immunity to collision. 14
5.1.4 Test for throughput ratio. 14
5.1.5 Test for immunity to unintentional and intentional component and message substitution. 14
5.1.6 Tests for immunity to interference. 15
5.1.7 Tests for RF link monitoring.16
5.2 Tests for antennas on grades 1 and 2 equipment. 17
5.3 Environmental tests . 17
Annex A (normative) Generic test arrangement for receiver . 18
Annex B (normative) Test arrangement for interference tests . 19
Annex C (informative) Signal levels diagram. 20
Annex D (normative) Test arrangement for transmitter. 22
Annex E (normative) Calculation for immunity to message substitution. 23
Annex F (normative) Interference timing diagrams . 25
Annex G (normative) Test arrangement for detection of interference . 26

Figures
Figure A.1 – Generic test arrangement for receiver.18
Figure B.1 – Test arrangement for interference tests . 19
Figure C.1 – Signal levels diagram . 20
Figure D.1 – Test arrangement for transmitter. 22
Figure F.1 – Interference timing diagrams . 25
Figure G.1 – Test arrangement for detection of interference. 26

Tables
Table 1 – Immunity to attenuation . 7
Table 2 – Equipment occupation of the medium. 8
Table 3 – Throughput ratio . 8
Table 4 – Identification codes. 8
Table 5 – Message substitution. 9
Table 6 – Interference outside of the assigned band for grades 1 and 2. 9
Table 7 – Interference within the assigned band for grades 1 and 2 . 10
Table 8 – Interference for grades 3 and 4. 10
Table 9 – Periodic communication . 11
Table 10 – Periodic communication before setting . 11
Table 11 – Detection of interference . 11
Table 12 – Detection of interference for equipment .12
Table 13 – Level of interference signal . 12
Table 14 – Requirements for antennas. 12
Table 15 – Duration of interference signals. 17

– 5 – EN 50131-5-3:2005
1 Scope
This European Standard applies to intrusion alarm equipment using radio frequency (RF) links and
located on protected premises. It does not cover long range radio transmissions.
This standard defines the terms used in the field of intrusion alarm equipment using radio frequency
links as well as the requirements relevant to the equipment.
It shall be used in conjunction with the other parts of the EN 50131 series that define the functional
requirements of the equipment regardless of the type of interconnections used.
2 Normative references
The following referenced documents are indispensable for the application 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.
Publication Year Title
EN 50131-1 1997 Alarm systems – Intrusion systems – Part 1: General requirements
EN 50131-6 1997 Alarm systems – Intrusion systems – Part 6: Power supplies
EN 301489-1 1999 Electromagnetic compatibility and Radio Spectrum Matters (ERM);
Electromagnetic Compatibility (EMC) standard for radio equipment
and services – Part 1: Common technical requirements
3 Definitions and abbreviations
For the purposes of this document, the following terms and definitions apply.
3.1 Definitions
3.1.1
alarm message
message conveying information regarding intruder, tamper or fault alarms
3.1.2
assigned band
frequency band within which the equipment is authorized to operate
3.1.3
attenuation
degradation of the RF signal due to a change in the passive environment of the system after its
installation (e.g. creation, relocation or reflection or absorption materials)
3.1.4
collision
simultaneous transmissions from two or more RF communication devices belonging to the same
system, of sufficient signal strength to cause corruption or obliteration of the RF signals
3.1.5
collision rate
probability of two or more messages having part or all of their information coincident on the RF link
leading to a collision
3.1.6
communication link
all local equipment, media and protocols used to route messages
3.1.7
disturbance
event originating internally or externally to the system and liable to impair transmission and/or
processing of data in the system
NOTE 1 It can be unintentionally or intentionally harmful.
Causes of disturbance are attenuation, collision, unintentional or intentional message substitution and
other RF interference.
NOTE 2 The different effects which disturbances may have on the signals are
– no corruption of the RF signal,
– corruption of the RF signal with no message corruption,
– corruption of the RF signal with partial message corruption,
– total obliteration of the RF signal (inability to receive).
3.1.8
failure of periodic communication
inability to pass a message on an RF link
3.1.9
identification code
part of a message used to identify a transmitting RF communication device belonging to the system
3.1.10
intentional message substitution
deliberate transmissions from an RF communication device using the correct protocol with the
intention of reducing the security of the system
3.1.11
message authentication
exchange of codes to validate the uniqueness of a transmitting device to a receiving device
3.1.12
monitoring message
message used to check the integrity of the communication link
3.1.13
RF interference
RF emissions from any other source, that may cause corruption or obliteration of wanted signals and
do not conform to the definition of collision or message substitution
3.1.14
RF communication device
device using RF transmission links
3.1.15
throughput ratio
ratio of the total number of messages sent by the transmitting device to the total number of messages
correctly interpreted by the receiving device

– 7 – EN 50131-5-3:2005
3.1.16
unintentional message substitution
non-deliberate transmissions from an RF communication device using the correct protocol emanating
from another system with no intention of reducing the security
3.2 Abbreviations
For the purpose of this document, the following abbreviations apply:
ATE: alarm transmission equipment
CIE: control and indicating equipment
RF: radio frequency
RL: reference level
TL: transmitted level
WD: warning device
4 General requirements
4.1 Immunity to attenuation
Due to the fact there may be changes in the passive environment after installation, it shall be possible
to temporarily attenuate the RF link during installation or maintenance according to the values given in
Table 1.
The manufacturer shall specify the means used on its equipment to fulfil this requirement.
Table 1 – Immunity to attenuation
Attenuation
Grade 1 3 dB
Grade 2 6 dB
Grade 3 9 dB
Grade 4 12 dB
NOTE Grades are defined in EN 50131-1.
4.2 Immunity to collision
4.2.1 Requirement for collision rate
The objective of the requirement for collision rate is to ensure a high level of confidence in the
transmissions of alarm and monitoring messages thus reducing the probability of equipment on the
same system causing interference by design and possibly leading to loss or corruption of information.
To keep the collision rate as small as possible, the following requirements given in Table 2 shall be
fulfilled.
Table 2 – Equipment occupation of the medium
Maximum occupation In a period of time of
(percentage)
Grade 1 10 % 240 min
Grade 2 10 % 120 min
Grade 3 10 % 100 s
Grade 4 10 % 10 s
In addition, all regulatory requirements concerning the duty cycle shall be complied with. To ensure
successful transmissions for grade 3 and 4 equipment, all types of messages (i.e. alarm, monitoring,
etc) shall be acknowledged by the receiving equipment to the transmitting equipment. In the case of
one alarm message colliding with one monitoring message, the alarm information shall in any case be
received in less than 10 s.
4.2.2 Requirement for throughput ratio
The objective of this requirement is to measure the ability of the receiving equipment to accurately
interpret and execute correct alarm messages.
Receiving equipment shall comply with the requirements of Table 3.
Table 3 – Throughput ratio
Minimum number of correctly
interpreted messages
Grade 1 999 out of 1 000
Grade 2 999 out of 1 000
Grade 3 9 999 out of 10 000
Grade 4 9 999 out of 10 000
4.3 Immunity to unintentional and intentional component and message substitution
Intentional message substitution generally attempts to reduce the security of the system primarily by
falsely unsetting it. Unintentional message substitution generally causes false alarms or tamper alarms
and has a nuisance value.
In order to prevent both unintentional and intentional message substitution, each transmitting device
shall be identified as belonging to the system by an identification code. The number of identification
code possibilities shall be at least equal to those shown in Table 4.
Table 4 – Identification codes
Identification codes
Grade 1 100 000
Grade 2 1 000 000
Grade 3 10 000 000
Grade 4 100 000 000
– 9 – EN 50131-5-3:2005
4.3.1 Immunity to unintentional and intentional components substitution
For grade 4 equipment, the CIE shall have means to detect substitution.
4.3.2 Immunity to intentional message substitution
To decrease the risk of intentional message substitution, the equipment shall fulfil a requirement given
by the probability for an intruder to discover the identification code in less than one hour. The
requirements are shown in Table 5.
Table 5 – Message substitution
Probability lower than
Grade 1 5 %
Grade 2 1 %
Grade 3 0,5 %
Grade 4 0,05 %
For grade 3 and grade 4 equipment, the receiving equipment shall have message authentication.
4.4 Immunity to interference
The purpose of this requirement is to check the ability of the receiving equipment to discriminate
between the desired signal and the interfering RF signals.
This immunity to interference requirement applies to all RF receiving equipment. Each of the
interference signals defined below shall be applied and shall not cause false alarms or an indication of
a failure of periodic communication.
During continuous application of the interfering signals whose levels are defined in subsequent
clauses, all of the 20 system relevant messages (sent by the transmitting equipment used for test
purposes) shall be correctly received and processed by the receiving equipment.
4.4.1 Interference outside of the assigned band for grades 1 and 2 equipment
The receiving equipment shall be fully functional when the level of interference (defined as Level B in
Annex C) is applied at frequency F as stated in 4.4 and subsequently at frequency F and according
1 2
to the values of Table 6.
F equals (F - 5 % F ) where F is the lowest frequency used by the equipment in the assigned
1 min min min
band and F (F + 5 % F ) where F is the highest frequency used by the equipment in the
2 max max max
assigned band.
In the event of the receiving equipment operating in more than one assigned band, the requirement
shall be fulfilled for each individual assigned band.
Table 6 – Interference outside of the assigned band for grades 1 and 2
F F
1 2
Level B Level B
Grade 1 10 V/m 10 V/m
Grade 2 10 V/m 10 V/m
4.4.2 Interference within the assigned band for grades 1 and 2 equipment
The receiving equipment shall be fully functional when the level of interference (defined as Level C in
Annex C) is applied to a test frequency known as F and according to the values of Table 7:
t
a) for receiving equipment using a single frequency known as F , F shall be equal to F ;
w t w
b) for receiving equipment using two or more separate frequencies in the same assigned band, F
t
shall be equal to (F + F ) / 2, where F is the lowest frequency used by the equipment and
min max min
F is the highest frequency used by the equipment in the assigned band;
max
c) for receiving equipment using one or more separate frequencies in separate assigned bands, the
test shall be conducted separately for each assigned band.
Table 7 – Interference within the assigned band for grades 1 and 2
F
t
Level C
Grade 1 (Level A) – 12 dB
Grade 2 (Level A) – 12 dB
NOTE Level A is defined in 5.1.6.2.

4.4.3 Interference for grades 3 and 4
The receiving equipment shall be fully functional when the level of interference (defined as Level D in
Annex C) is applied separately at F , F and finally F , where F is as defined in 4.4.2, and F and F are
t 1 2 t 1 2
as defined in 4.4.1 and according to the values given in Table 8.
Table 8 – Interference for grades 3 and 4
F F F
t 1 2
Level D Level D Level D
Grade 3 10 V/m 10 V/m 10 V/m
Grade 4 10 V/m 10 V/m 10 V/m
4.5 Requirement for RF links monitoring
RF links monitoring shall be performed by all receiving equipment. The RF links shall be monitored in
accordance with the grade. The indication or notification is dependent on the grade and the state of
the equipment and the type of disturbances detected by the monitoring function.
The following disturbances shall be detected: failure of periodic communication and interference.
4.5.1 Requirement for the detection of a failure of periodic communication
The RF receiving equipment (CIE or ATE) shall report and identify a failure of periodic communication
with a transmitting device of the system within the time periods specif
...