IEC 62642-5-3:2010

IEC 62642-5-3 ®
Edition 1.0 2010-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Alarm systems – Intrusion and hold-up systems –
Part 5-3: Interconnections – Requirements for equipment using radio frequency
techniques
Systèmes d'alarme – Systèmes d'alarme contre l'intrusion et les hold-up –
Partie 5-3: Interconnexions – Exigences pour les équipements utilisant des
techniques radio fréquence
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IEC 62642-5-3 ®
Edition 1.0 2010-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Alarm systems – Intrusion and hold-up systems –
Part 5-3: Interconnections – Requirements for equipment using radio frequency
techniques
Systèmes d'alarme – Systèmes d'alarme contre l'intrusion et les hold-up –
Partie 5-3: Interconnexions – Exigences pour les équipements utilisant des
techniques radio fréquence
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
U
CODE PRIX
ICS 13.320 ISBN 978-2-88912-200-4
– 2 – 62642-5-3 © IEC:2010
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.7
2 Normative references .7
3 Terms, definitions and abbreviations .7
3.1 Terms and definitions .7
3.2 Abbreviations .9
4 General requirements .9
4.1 Immunity to attenuation.9
4.2 Immunity to collision.9
4.2.1 Requirement for collision rate .9
4.2.2 Requirement for throughput ratio .10
4.3 Immunity to unintentional and intentional component and message
substitution.10
4.3.1 Immunity to unintentional and intentional components substitution .11
4.3.2 Immunity to intentional message substitution.11
4.4 Immunity to interference.11
4.4.1 Interference outside of the assigned band for grades 1 and 2
equipment .11
4.4.2 Interference within the assigned band for grades 1 and 2 equipment .12
4.4.3 Interference for grades 3 and 4.12
4.5 Requirement for RF links monitoring.12
4.5.1 Requirement for the detection of a failure of periodic communication.12
4.5.2 Requirement for the detection of interference .13
4.6 Requirements for antennas .14
5 Tests .15
5.1 RF disturbance tests .15
5.1.1 Reference level determination .15
5.1.2 Test for immunity to attenuation.15
5.1.3 Verification of immunity to collision.16
5.1.4 Test for throughput ratio .16
5.1.5 Test for immunity to unintentional and intentional component and
message substitution.16
5.1.6 Tests for immunity to interference.17
5.1.7 Tests for RF link monitoring.18
5.2 Tests for antennas on grades 1 and 2 equipment .19
5.3 Environmental tests.20
Annex A (normative) Generic test arrangement for receiver .21
Annex B (normative) Test arrangement for interference tests.22
Annex C (informative) Signal levels diagram .23
Annex D (normative) Test arrangement for transmitter .25
Annex E (normative) Calculation for immunity to message substitution .26
Annex F (normative) Interference timing diagrams .28
Annex G (normative) Test arrangement for detection of interference.29
Bibliography.30

62642-5-3 © IEC:2010 – 3 –
Figure A.1 – Generic test arrangement for receiver.21
Figure B.1 – Test arrangement for interference tests .22
Figure C.1 – Signal levels diagram .24
Figure D.1 – Test arrangement for transmitter.25
Figure F.1 – Interference timing diagrams.28
Figure G.1 – Test arrangement for detection of interference .29

Table 1 – Immunity to attenuation .9
Table 2 – Equipment occupation of the medium .10
Table 3 – Throughput ratio.10
Table 4 – Identification codes .10
Table 5 – Message substitution.11
Table 6 – Interference outside of the assigned band for grades 1 and 2.11
Table 7 – Interference within the assigned band for grades 1 and 2.12
Table 8 – Interference for grades 3 and 4 .12
Table 9 – Periodic communication .13
Table 10 – Periodic communication before setting .13
Table 11 – Detection of interference .13
Table 12 – Detection of interference for equipment .14
Table 13 – Level of interference signal .14
Table 14 – Requirements for antennas .14
Table 15 – Duration of interference signals .19

– 4 – 62642-5-3 © IEC:2010
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ALARM SYSTEMS –
INTRUSION AND HOLD-UP SYSTEMS –

Part 5-3: Interconnections –
Requirements for equipment using radio frequency techniques

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62642-5-3 has been prepared by IEC technical committee 79:
Alarm and electronic security systems.
This standard is based on EN 50131-5-3 (2005).
The text of this standard is based on the following documents:
FDIS Report on voting
79/309/FDIS 79/320/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

62642-5-3 © IEC:2010 – 5 –
A list of all parts of the IEC 62642 series can be found, under the general title Alarm systems
– Intrusion and hold-up systems, on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 6 – 62642-5-3 © IEC:2010
INTRODUCTION
This part 5-3 of the IEC 62642 series of standards gives requirements for interconnections
equipment using radio frequency techniques used in intrusion and hold-up alarm systems.
The other parts of this series of standards are as follows:
Part 1 System requirements
Part 2-2 Intrusion detectors – Passive infrared detectors
Part 2-3 Intrusion detectors – Microwave detectors
Part 2-4 Intrusion detectors – Combined passive infrared / microwave detectors
Part 2-5 Intrusion detectors – Combined passive infrared / ultrasonic detectors
Part 2-6 Intrusion detectors – Opening contacts (magnetic)
Part 2-71 Intrusion detectors – Glass break detectors – Acoustic
Part 2-72 Intrusion detectors – Glass break detectors – Passive
Part 2-73 Intrusion detectors – Glass break detectors – Active
Part 3 Control and indicating equipment
Part 4 Warning devices
Part 5-3 Interconnections – Requirements for equipment using radio frequency techniques
Part 6 Power supplies
Part 7 Application guidelines
Part 8 Security fog devices/systems

62642-5-3 © IEC:2010 – 7 –
ALARM SYSTEMS –
INTRUSION AND HOLD-UP SYSTEMS –

Part 5-3: Interconnections –
Requirements for equipment using radio frequency techniques

1 Scope
This part of the IEC 62642 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 is used in conjunction with the other parts of the IEC 62642 series that define the functional
requirements of the equipment regardless of the type of interconnections used.
2 Normative references
None.
NOTE Reference to IEC 62642-1 appears only in a Note, as such the reference is indicated in a bibliography at
the last page of the present document.
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
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 transmission 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

– 8 – 62642-5-3 © IEC:2010
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 transmission 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 emission 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

62642-5-3 © IEC:2010 – 9 –
3.1.16
unintentional message substitution
non-deliberate transmission 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 purposes 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 IEC 62642-1.
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.

– 10 – 62642-5-3 © IEC:2010
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
62642-5-3 © IEC:2010 – 11 –
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 to the values of Table 6.
F equals (F – 5 % F ) where F is the lowest frequency used by the equipment in the
1 min min min
assigned band and F (F + 5 % F ) where F is the highest frequency used by the
2 max max max
equipment in the 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
– 12 – 62642-5-3 © IEC:2010
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
t
Table 7:
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 shall be equal to (F + F ) / 2, where F is the lowest frequency used by
t min max min
the equipment and F is the highest frequency used by the equipment in the assigned
max
band;
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
t 1 2 t
4.4.2, and F and F are as defined in 4.4.1 and according to the values given in Table 8.
1 2
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 specified in
Table 9.
62642-5-3 © IEC:2010 – 13 –
Table 9 – Periodic communication
By CIE By CIE By CIE By ATE
from detector from WD from ATE from CIE
Periods
a a
Grade 1 240 min 240 min 240 min 240 min
a a
Grade 2 120 min 120 min 120 min 120 min
Grade 3 100 s 100 s 100 s 100 s
Grade 4 10 s 10 s 10 s 10 s
a
This requirement is optional for this grade.

In the event of a failure of periodic communication as defined in Table 9, a fault or tamper
signal shall be generated for grades 1 and 2 equipment and a tamper signal shall be
generated for grades 3 and 4 equipment.
In grades 1, 2, 3 and 4, setting shall be prevented when the last periodic communication
message from any transmitting equipment exceeds the period specified in Table 10.
Table 10 – Periodic communication before setting
Period
Grade 1 60 min
Grade 2 20 min
Grade 3 100 s
Grade 4 10 s
Portable equipment need not conform to the requirements given in Table 9 and Table 10.
4.5.2 Requirement for the detection of interference
If the level of interference is great enough to corrupt the correct transmissions between
equipment, detection of interference shall take place when the levels of interference are
detected for time periods as specified in Table 11.
Table 11 – Detection of interference
Detection of interference (maximum)
Grade 1 Sum total of 30 s of interference signal in any 60 s
Grade 2 Sum total of 30 s of interference signal in any 60 s
Grade 3 Sum total of 10 s of interference signal in any 20 s
Grade 4 Sum total of 10 s of interference signal in any 20 s

For all grades, where the interference detected is less than 5 s in any period of 60 s, there
shall be no indication or notification. For grade 1 and 2 equipment fulfilling the requirement of
grade 3 and 4 equipment as defined in 4.4.3, it is permissible to have an indication or
notification for a time between 5 s and the times specified in Table 11.
In the event of detection of interference as defined in Table 11, a fault or tamper signal shall
be generated for grades 1 and 2 equipment and a tamper signal shall be generated for
grades 3 and 4 equipment.
– 14 – 62642-5-3 © IEC:2010
According to the grade of the system, the following requirements given in Table 12 for
interference detection apply:
Table 12 – Detection of interference for equipment
System state CIE WD ATE
Detection of interference
a
Grade 1 At all times Mandatory Optional Optional
a
Grade 2 At all times Mandatory Optional Optional
Grade 3 At all times Mandatory Mandatory Mandatory
Grade 4 At all times Mandatory Mandatory Mandatory
a
For external devices, if this function is provided, the WD shall conform to the requirement for immunity
to interference as defined in 4.4.3.

The interference signal (described as Level E in Annex C) shall be applied as shown in
Annex B as defined in 5.1.7.2 according to the values of Table 13:
Table 13 – Level of interference signal
WD or ATE
Tamper notification
Level E
a
Grade 1 IL + 40 dB
Grade 2 IL + 30 dB
Grade 3 IL + 9 dB
Grade 4 IL + 9 dB
NOTE IL is the interference level generated by the
interfering transmitting equipment as defined in 5.1.7.2.
a
This requirement is optional.
4.6 Requirements for antennas
For grades 1 and 2, equipment using antennas external to the housing shall fulfil the
requirements given in Table 14:
Table 14 – Requirements for antennas
Intentional degrading of antenna performance
CIE Indicate fault and prohibit setting
WD Local notification by device
ATE Automatic transmission of tamper alarm

For grades 1 and 2 equipment, the antennas shall not be removable without opening the
housing.
For grades 3 and 4 equipment, antennas shall fulfil the same tamper protection requirements
as those of the device using these antennas.

62642-5-3 © IEC:2010 – 15 –
5 Tests
5.1 RF disturbance tests
All level measurements shall be made with a spectrum analyser graduated in dBm unless
otherwise stated. The RF signal level measured at the input of the spectrum analyser shall be
equal to the RF signal level fed to the antennas. All cables shall have the same characteristic
impedance.
For the tests, the manufacturer shall provide the receiving equipment to be tested, together
with one or more devices modified to electronically trigger RF messages such as alarm,
monitoring or other messages for test purposes or the transmitting equipment to be tested
with associated receiving equipment, for test purposes.
If the equipment under test uses a primary battery power source only, no low battery
indication shall be observed on completion of the test.
5.1.1 Reference level determination
The reference level of the receiving equipment under test shall be determined and used as a
basis for other tests.
This measurement is to be conducted with the arrangement shown in Annex A, in a shielded
anechoic chamber allowing tests to be carried out with a distance of 3 m between transmitting
and receiving equipment.
The arrangement shown in Annex A shall be used, but the signal generator shall be replaced
by a suitable load.
The RL level determination shall be performed twice, once with the antenna positioned
horizontally and the once with the antenna positioned vertically. The smallest reference level
indicates the position of the antenna to be used for all other tests.
The receiving equipment shall be oriented for maximum sensitivity.
To determine the reference level, the attenuation signal should be increased until 12 to 15
alarm messages out of 50 generated by the transmitting equipment are not received by the
receiving equipment under test. The reference level is the value observed on the spectrum
analyser measured in dBm increased by 3 dB.
EXAMPLE Value observed on the spectrum analyser is – 80 dBm.
Reference level is RL = – 80 dBm + 3 dB = – 77 dBm.
5.1.2 Test for immunity to attenuation
The test method used to determine the reference level shall be used to check immunity to
attenuation as specified in 4.1. For the purposes of this test, the equipment shall be
configured as indicated in the manufacturer's installation or maintenance specification.
5.1.2.1 Measurement procedure of the transmitted level (TL) of the transmitting
equipment
a) The transmitting equipment under test shall be placed in the shielded anechoic chamber
as shown in Annex D.
b) Measure in dBm the TL of the transmitting equipment under normal conditions (TLn).
c) Measure in dBm the TL of the transmitting equipment with the attenuation function active
(TLi).
– 16 – 62642-5-3 © IEC:2010
5.1.2.2 Measurement procedure of the reference level (RL) of the receiving
equipment
a) The receiving equipment under test shall be placed in the shielded anechoic chamber as
shown in Annex A.
b) Measure in dBm the RL of the receiving equipment under normal conditions (RLn).
c) Measure in dBm the RL of the receiving equipment with the attenuation function active
(RLi).
Verify the following result: [(TLn – TLi) – (RLn – RLi)] equals or greater to the values given in
Table 1.
5.1.3 Verification of immunity to collision
The collision rate for any given system shall be calculated as a derivative of the maximum
number of transmitters, duration of individual monitoring transmissions and number of
monitoring transmissions.
The maximum number of transmitters to be considered for the calculation shall comply with
the specification of the manufacturer. The manufacturer shall provide the information
demonstrating how the system complies with the collision rate of Table 2.
Furthermore, transmitting equipment shall be triggered to transmit a monitoring message
synchronously with the transmission of one alarm message. The CIE shall process the alarm
in less than 10 s. The test shall be conducted in the anechoic chamber.
5.1.4 Test for throughput ratio
The test is to be conducted in a shielded anechoic chamber. The manufacturer shall provide
the means for ensuring the transmission of the requisite number of alarm messages.
a) The receiving equipment/transmitting equipment combination shall be configured to the
reference level condition increased by 6 dB as determined in 5.1.1.
b) A counter shall be connected to the transmitting equipment to record the number of
transmissions. The arrangement shall not interfere with the transmitting equipment output.
c) The transmitting equipment shall be capable of continuous transmission of 1 000 or
10 000 alarm messages with a valid identification code.
For all grades, if more than two alarm messages are lost, the equipment fails the test. If two
alarm messages are lost, the test shall be repeated and no alarm message shall be lost.
5.1.5 Test for immunity to unintentional and intentional component and message
substitution
According to Table 5, the manufacturer shall provide information demonstrating the method of
compliance.
5.1.5.1 Test for immunity to component substitution for grades 3 and 4
The test shall be conducted in a shielded anechoic chamber. The CIE shall be in the set
condition and placed in the shielded anechoic chamber in the arrangement shown in Annex A.
The signal generator shall be replaced by a signal recorder and generator. An unset message
shall be triggered by the original transmitter once, and this signal shall be recorded by the
signal recorder. The CIE shall be set again. The signal recorder and generator shall be
triggered continuously for one hour. The CIE shall remain set.
5.1.5.2 Test for immunity to message substitution
According to Table 5, the result shall be obtained using the method shown in Annex E.

62642-5-3 © IEC:2010 – 17 –
According to the requirement of message authentication, the manufacturer shall provide
information demonstrating the method of compliance.
5.1.6 Tests for immunity to interference
For high field strength measurements (above 1 V/m), a uniform field shall be first established
in the shielded anechoic chamber.
All tests shall be performed twice, once with the antenna generating the interference signal
positioned vertically and again with the antenna positioned horizontally.
5.1.6.1 Test for interference outside of the assigned band for grade 1 and 2
equipment
The equipment shall be arranged as shown in Annex B.
Before the interference signal is applied, the receiving equipment shall be set to the reference
level condition. Attenuation shall now be reduced such that the observed signal level on the
spectrum analyser is RL + 20 dB. This level is called Level A (see Annex C).
EXAMPLE (RL – 77 dBm, value to be observed equals – 77 dBm + 20 dB) = – 57 dBm)
An interference signal shall be applied continuously using the signal generator. This signal
shall be 80 % amplitude modulated by the binary sequence "01010101". The modulation rate
in baud is calculated according to the formula R = 1/t where t is the shortest significant
duration of the original transmitted signal.
The interference signal level (described as Level B in Table 6) shall be applied.
The test shall be conducted separately for frequency F and frequency F of each assigned
1 2
band used by the receiving equipment and for both antenna polarities.
The test is satisfactory if the receiving equipment under test has correctly processed all of the
20 messages sent by the transmitting device used for test purposes.
5.1.6.2 Test for interference within the assigned band for grade 1 and 2 equipment
The equipment shall be arranged as shown in Annex B.
Before the interference signal is applied, the receiving equipment shall be set to the reference
level condition. Attenuation shall now be reduced such that the observed signal level on the
spectrum analyser is RL + 20 dB. This level is called Level A (see Annex C).
EXAMPLE (RL – 77 dBm, value to be observed equals – 77 dBm + 20 dB) = – 57 dBm)
An interference signal shall be applied continuously using the signal generator. This signal
shall be 80 % amplitude modulated by the binary sequence "01010101". The modulation rate
in baud is calculated according to the formula R = 1/t where t is the shortest significant
duration of the original transmitted signal.
The interference signal (described as Level C in Table 7) shall be applied.
The test shall be conducted for frequency F of each assigned band used by the receiving
t
equipment.
The test is satisfactory if the receiving equipment under test has correctly processed all of the
20 messages sent by the transmitting device used for test purposes.

– 18 – 62642-5-3 © IEC:2010
5.1.6.3 Test for interference for grade 3 and grade 4 equipment
The equipment shall be arranged as shown in Annex B.
Before the interference signal is applied, the receiving equipment shall be set to the reference
level condition. Attenuation shall now be reduced such that the observed signal level on the
spectrum analyser is RL + 20 dB. This level is called Level A (see Annex C).
EXAMPLE (RL – 77 dBm, value to be observed equals – 77 dBm + 20 dB = – 57 dBm)
An interference signal shall be applied continuously using the signal generator. This signal
shall be 80 % amplitude modulated by the binary sequence "01010101". The modulation rate
in baud is calculated according to the formula R = 1/t where t is the shortest significant
duration of the original transmitted signal.
The interference signal level (described as Level B for outside of the band and Level D for
inside of the band in Table 8) shall be applied.
The test shall be conducted separately for F , F and F of each assigned band used by the
t 1 2
receiving equipment and for both antenna polarities.
The test is satisfactory if the receiving equipment under test has correctly processed all of the
20 messages
...