SIST TBR 007 E1:2004
(Main)Radio Equipment and Systems (RES); European Radio MEssaging Service (ERMES); Receiver requirements
Radio Equipment and Systems (RES); European Radio MEssaging Service (ERMES); Receiver requirements
Elaborate the TBR no. 7 for ERMES receivers.
Radijska oprema in sistemi (RES) - Izboljšani sistem za radijsko sporočanje (ERMES) - Zahteve za sprejemnik
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2004
5DGLMVNDRSUHPDLQVLVWHPL 5(6 ,]EROMãDQLVLVWHP]DUDGLMVNRVSRURþDQMH
(50(6 =DKWHYH]DVSUHMHPQLN
Radio Equipment and Systems (RES); European Radio MEssaging Service (ERMES);
Receiver requirements
Ta slovenski standard je istoveten z: TBR 007 Edition 1
ICS:
33.060.20 Sprejemna in oddajna Receiving and transmitting
oprema equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
TECHNICAL TBR 7
BASIS for November 1994
REGULATION
Source: ETSI TC-RES Reference: DTBR/RES-04001
ICS: 33.080
ERMES, paging
Key words:
Radio Equipment and Systems (RES);
European Radio Message System (ERMES)
Receiver requirements
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - secretariat@etsi.fr
X.400: Internet:
Tel.: +33 92 94 42 00 - Fax: +33 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 1994. All rights reserved.
New presentation - see History box
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TBR 7: November 1994
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.
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TBR 7: November 1994
Contents
Foreword .7
1 Scope .9
2 Normative references .9
3 Definitions and abbreviations .9
3.1 Introduction.9
3.2 Vocabulary.10
3.2.1 Administrative terms .10
3.2.2 Identity related terms .10
3.2.3 Services, facilities and receiver features .10
3.2.4 Network related terms.10
3.2.5 Area concepts.10
3.2.6 Terms related to the radio subsystem .11
3.3 Abbreviations and acronyms.11
4 General.11
4.1 Introduction.11
4.2 Choice of model for approval testing.11
4.3 Description of equipment .12
4.3.1 Manufacturer's declaration.12
4.4 Mechanical and electrical design .12
4.5 Categories of receivers .13
4.6 The requirements and justifications .13
4.6.1 Average usable sensitivity (normal).13
4.6.2 Degradation in required sensitivity under channel switching .13
4.6.3 Degradation in required sensitivity in extremes and offset .13
4.6.4 Co-channel rejection (normal) .14
4.6.5 Adjacent channel selectivity (normal) .14
4.6.6 Adjacent channel selectivity (extreme) .14
4.6.7 Spurious response immunity .14
4.6.8 Intermodulation immunity.15
4.6.9 Blocking immunity or desensitisation.15
4.6.10 Usable input range.15
4.6.11 The maximum degradation in required sensitivity for combined multi-path and
quasi-synchronous transmissions .15
4.6.12 Spurious emissions.16
4.6.13 Last message in batch.16
4.6.14 Message continued in next batch .16
4.6.15 Message in last available batch.17
4.6.16 Tenure of message.17
4.6.17 Two messages in the same batch .17
4.6.18 Message continued in the next sub-sequence .17
4.6.19 Message reception on all ERMES channels.17
4.6.20 Recognition of zone code .17
4.6.21 Two messages in the same batch .18
4.6.22 Message in overlap areas (BAI = 1) .18
4.6.23 Message in overlap areas (BAI = 0) .18
4.6.24 Receiver paging categories .18
4.6.24.1 Tone-only functions .18
4.6.24.2 Numeric category functions.18
4.6.24.3 Alphanumeric category functions .18
4.6.25 Termination of numeric messages due to reception errors .19
4.6.26 Termination of alphanumeric messages due to reception errors .19
4.6.27 Group call.19
4.6.28 Tenure of group messages.19
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4.6.29 RSVD bits. 19
4.6.30 Additional features. 20
4.7 Interpretation of measurement results. 20
5 General test requirements . 20
5.1 Test philosophy. 20
5.2 Receiver to be submitted for conformance testing . 20
5.3 Normal test conditions . 20
5.4 Extreme test conditions . 21
5.5 Test fixture. 21
5.6 Test paging signal. 21
5.6.1 Successful tone-only call. 21
5.6.2 Successful numeric message . 21
5.6.3 Successful alphanumeric message . 21
5.7 Declared category. 21
5.7.1 General. 21
5.7.2 Test time saving procedure. 22
6 TBR requirements table. 23
7 Tests for radio parameter conformance . 24
7.1 Conformance requirements. 24
7.2 Method of measurement. 25
8 Tests for radio interface conformance . 26
8.1 Last message in batch. 27
8.2 Message continued in next batch . 27
8.3 Message in last available batch. 27
8.4 Tenure of message. 28
8.5 Two messages in same batch. 28
8.6 Message continued in the next sub-sequence . 28
8.7 Message reception on all ERMES channels. 29
8.8 Recognition of zone code . 29
8.9 Two messages in the same batch.29
8.10 Message reception in overlap regions (BAI = 1). 29
8.11 Message reception in overlap regions (BAI = 0). 29
8.12 Messages . 30
8.12.1 Tone message (alert signal indicator bits "000"). 30
8.12.2 Maximum length numeric message . 30
8.12.3 Maximum length alphanumeric message . 30
8.13 Termination of numeric messages due to reception errors. 30
8.14 Termination of alphanumeric messages . 31
8.15 Group call . 31
8.16 Tenure of group message . 31
Annex A (normative): Measurement procedures. 32
A.1 Average measured usable sensitivity expressed as field strength under normal conditions . 32
A.1.1 Definition . 32
A.1.2 Method of measurement . 32
A.2 Radiated spurious components. 33
A.2.1 Definition . 33
A.2.2 Method of measurement . 33
A.3 Co-channel rejection. 34
A.3.1 Definition . 34
A.3.2 Method of measurement . 34
A.4 Adjacent channel selectivity. 35
A.4.1 Definition . 35
A.4.2 Method of measurement . 35
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A.5 Spurious response immunity.36
A.5.1 Definition .36
A.5.2 Method of measurement.36
A.6 Intermodulation immunity.36
A.6.1 Definition .36
A.6.2 Method of measurement.37
A.7 Blocking immunity .38
A.7.1 Definition .38
A.7.2 Method of measurement.38
A.8 Combined multi-path and quasi-synchronous transmissions.38
A.8.1 Definition .38
A.8.2 Method of measurement.39
Annex B (normative): Ancillary test data .40
B.1 Simulated man .40
B.2 Definition of un-wanted test signal .40
B.3 Definition of reference figure.40
B.4 Sensitivity measurement test sites.41
B.4.1 Description of test sites for receiver sensitivity measurements .41
B.4.2 Description of an open air test site.41
B.4.2.1 Receiver sensitivity measurement test site characteristics .41
B.4.2.2 Receiver sensitivity measurement test site .41
B.4.2.3 Position of the equipment under test.42
B.4.2.4 Transmitting antenna.42
B.4.2.5 Calibration .42
B.4.2.6 Substitution antenna.43
B.4.2.7 Selective measuring device.44
B.4.3 Description of an anechoic chamber .44
B.5 Definition of test sites suitable for spurious emissions measurements.44
B.5.1 An anechoic chamber .44
B.5.1.1 General.44
B.5.1.2 Description.44
B.5.1.3 Influence of parasitic reflections.44
B.5.1.4 Calibration and mode of use .45
B.5.2 Open air test site suitable for emission tests .47
B.5.2.1 Test site characteristics for radiated emissions testing.47
B.5.2.2 Radiation emissions test site.47
B.5.2.3 Position of the equipment under test.48
B.5.2.4 Measuring antenna support.48
B.5.2.5 Measuring antenna.48
B.5.2.6 Substitution antenna.49
B.5.2.7 Radio-frequency signal generator .49
B.5.2.8 Selective measuring device.49
B.6 Description of test fixture.49
B.7 Measurement uncertainty.49
B.8 Maximum degradation in required sensitivity .50
B.9 Differential factors .50
B.9.1 General .50
B.9.2 Definition of numeric differential factor .50
B.9.3 Definition of alphanumeric differential factor.51
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B.10 Calculations of spurious responses frequencies. 52
B.10.1 Introduction to the method. 52
Annex C (normative): Character sets in the ERMES system . 53
C.1 Characters for numeric paging. 53
C.2 Characters for alphanumeric paging . 54
History. 55
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Foreword
This Technical Basis for Regulation (TBR) has been produced by the Radio Equipment and Systems
(RES) Technical Committee of the European Telecommunications Standards Institute (ETSI).
This TBR covers the requirements for terminal (mobile) equipment for use within the European Radio
Message System (ERMES).
This TBR contains the procedures and requirements for the approval testing of ERMES terminal (mobile)
equipment which are mainly intended to be body worn.
The ERMES equipment to be approved is not intended to be physically attached to the public network.
This TBR is based on ETS 300 133-4 [2] and ETS 300 133-5 [3].
This TBR also includes a vocabulary of terms and a list of abbreviations and acronyms.
Annexes A, B and C are normative and therefore integral parts of this TBR.
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Blank page
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1 Scope
This TBR specifies the technical characteristics to be provided by European Radio Message System
(ERMES) terminal equipment, which are mainly intended to be body worn and are capable of the
reception and decoding of signals transmitted according to the ERMES standard, as described in ETS 300
133-4 [2].
The objective of this TBR is to ensure that ERMES terminal equipment meets the essential requirements
as laid down in terms of the Directive 91/263/EEC [6], Articles 4d to 4g.
There are no specific EMC requirements included in this TBR for Article 4c of Directive 91/263/EEC [6].
The general EMC requirements for ERMES are included in ETS 300 340 [10].
2 Normative references
This TBR incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this TBR only when incorporated in it by amendment or revision. For undated references the
latest edition of the publication referred to applies.
[1] ETS 300 133-2 (1992): "Paging Systems (PS) - European Radio Message
System (ERMES) Part 2: Service aspects".
[2] ETS 300 133-4 (1992): "Paging Systems (PS) - European Radio Message
System (ERMES) Part 4: Air interface specification".
[3] ETS 300 133-5 (1992): "Paging Systems (PS) - European Radio Message
System (ERMES) Part 5: Receiver conformance specification".
[4] ISO Standard 1073 parts 1 & 2: "Alphanumeric character sets for optical
recognition".
[5] CTR Scope (5/3/92): "European Radio Message System (ERMES) - Approval
requirements for paging receivers" (NTRAC).
[6] Official Journal of the European Communities Volume 34, 23 May 1991:
"Council Directive 91/263 /EEC of 29 April 1991 on the approximation of the
laws of the Member States concerning telecommunications terminal equipment,
including the mutual recognition of their conformity".
[7] Handbook on CTRs, Draft Issue 2 for presentation to TRAC on 16/17 February
1993.
[8] ETS 300 133-6 (1992): "Paging Systems (PS) - European Radio Message
System (ERMES) Part 6: Base station conformance specification".
[9] ETR 028: "Radio Equipment and Systems (RES) - Uncertainties in the
measurement of mobile radio equipment characteristics".
[10] ETS 300 340: "Radio Equipment and Systems (RES); Electro-Magnetic
Compatibility (EMC) for European Radio Message System (ERMES) paging
receivers".
3 Definitions and abbreviations
3.1 Introduction
The terms, definitions and abbreviations used within this TBR are given in this clause. A definition or a
reference to a definition given in this clause is valid for all clauses of this TBR.
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An explanation of all the abbreviations and acronyms used in this TBR is given in alphabetical order in
subclause 3.3.
The definitions are presented in six groups. Within each group the definitions are given in a conceptual
order rather than alphabetical order.
3.2 Vocabulary
3.2.1 Administrative terms
user: A person or machine initiating an access to the operator network or receiving a message through
the operator network. User includes mobile subscribers, fixed subscribers and non-registered customers.
network operator: The administration/company which is responsible for the technical and commercial
operation of the operator network.
home operator: The network operator to which a specific user has subscribed.
3.2.2 Identity related terms
basic Radio Identity Code (RIC): The prime identity of the paging receiver allocated by the network
operator when service is initiated. It shall not be changeable without safeguards against unauthorised
changes.
Radio Identity Code (RIC): The number used by the system on the radio path to identify the receiver(s)
for which the paging signal is intended. RIC has a total length of 35 bits and consists of four parts: The
zone code (3 bits) the country code (7 bits), the operator code (3 bits) and the local address (22 bits).
operator identity: The number used by the system on the radio path to identify the home operator of a
receiver. It has a total length of 13 bits and consists of three parts, the zone code, the country code and
the operator code.
zone code: Binary representation of the zone number defined in ETS 300 133-4 [2], annex A. The zone
code consists of 3 bits.
country code: Binary representation of the country number defined in ETS 300 133-4 [2], annex A. The
country code consists of 7 bits.
operator code: The number used by the system to identify an operator within a country. It consists of 3
bits.
initial address: The 18 most significant bits of the local address.
3.2.3 Services, facilities and receiver features
group call: A call intended for two or more mobile subscribers.
3.2.4 Network related terms
ERMES system: The totality of the operator networks.
home network: The operator network with which a mobile subscriber has signed a subscription.
3.2.5 Area concepts
paging area: The area controlled by a Paging Area Controller (PAC). It is the minimum area to which a
mobile subscriber is permitted to subscribe in order to receive his paging messages.
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3.2.6 Terms related to the radio subsystem
paging signal: The signal sent on the radio path to a paging receiver.
alert signal: The signal generated by the receiver as an indication of a received paging signal.
alert signal indicator: The information bits contained in the I1 message header that determines which
alert signal should be generated at the receiver. It is related to the address code input by the calling party.
code-word: The standard information unit of 30 bits length (used on the air interface).
codeblock: The unit of nine interleaved code-words used in the message partition of the air interface.
batch number: The 4 bit number corresponding to a particular batch type. Batch type A shall correspond
to batch number 0000. Batch type P shall correspond to batch number 1111.
batch type: The letter (A to P) which identifies one of the 16 batches within a sub-sequence.
End of Message (EOM) character: A specific character used to indicate the end of an alphanumeric
message. It corresponds to DC1 as defined in ETS 300 133-2 [1], annex B, clause B.2.
3.3 Abbreviations and acronyms
BAI Border Area Indicator
CTA Common Temporary Address
CTAP Common Temporary Address Pointer
EOM End of Message
ERMES European Radio Message System
EUT Equipment Under Test
IA Initial Address
LCD Liquid Crystal Display
PAC Paging Area Controller
p.d. potential difference
RF Radio Frequency
RIC Radio Identity Code
RSVD Reserved bits for future definition
rms root mean square
SSI Supplementary System Information
TBR-RT Technical Basis for Regulation - Requirements Table
4 General
4.1 Introduction
This TBR is based on the CTR Scope statement [5] from NTRAC on CTR No. 7.
This TBR specifies the receiver conformance requirements and the considered relevance of the Articles
from the directive 91/263/EEC [6] with regard to ERMES receivers. The CTR Scope statement suggests
that this TBR should only consider Articles 4e, 4f, and 4g. Article 4a is dealt with under the Low Voltage
Directive (73/23/EEC), while Articles 4b and 4d are considered not relevant for this TBR. In the TBR
Requirements Table (TBR-RT) given in clause 6, the tests to be carried out on ERMES receivers and the
relevant Articles in the CTR scope statement [5] are tabulated.
4.2 Choice of model for approval testing
The applicant shall provide one preliminary or production model of the equipment, as appropriate for
approval testing.
If approval is given on the basis of tests on a preliminary model, then the corresponding production
models shall be identical in all respects to the preliminary model tested.
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4.3 Description of equipment
The applicant shall provide the following information to the test laboratory.
4.3.1 Manufacturer's declaration
A declaration by the manufacturers or applicant shall be supplied detailing the following parameters:
a) the normal and extreme test voltages, see ETS 300 133-5 [3], subclauses 5.2 and 5.3;
b) any combination of the control characters ESC, LF and CR and any other character which should
not be used for test in subclause 4.6.24.3, see ETS 300 133-5 [3], subclause 8.3;
c) a statement demonstrating that no combination of the RSVD bits affects the performance of the
receiver with respect to this TBR, subclause 4.6.29;
d) the method to simulate insufficient quality of reception (BER, code-word error rate, erroneous
system information) and the time constraints to be used in test 8.11, see ETS 300 133-5 [3]
subclause 8.2.5;
e) a statement demonstrating that any features in the receiver that are additional to the requirements
of this TBR do not affect the performance of the receiver with respect to this TBR, see subclause
4.6.30;
f) there will be a certain minimum time after a receiver is switched on before it is capable of receiving
messages as described in the tests in clause 6. It is required that this time is stated, see ETS 300
133-5 [3] subclause 8.12.1;
g) the category of receiver shall be declared (see subclause 4.5);
h) the alerts associated with all the alert signal indicator bit sequences shall be declared. In addition
the means whereby these alerts maybe tested shall be explained. If any additional equipment is
required to test these alerts, then this shall be supplied by the manufacturer, see ETS 300 133-5 [3]
subclause 7.3.1;
j) the message presentation technique shall be declared by the manufacturer. This is required to
enable the test laboratory to test the message function;
k) the receiver shall have a basic RIC. The manufacturer shall declare that this RIC meets the
requirements of ETS 300 133-4 [2], clause 3;
l) the reference orientation that shall be close to the orientation in normal use;
m) for the calculations of spurious response measurement the manufacturer shall state the frequency
of the oscillator signal applied to the first mixer of the receiver, the intermediate frequencies of the
receiver and the switching range.
4.4 Mechanical and electrical design
Any control or adjustment which, if maladjusted, could affect the conformance of the product to this TBR
shall not be readily accessible to the user.
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4.5 Categories of receivers
There are four categories of receivers, according to the different paging services they are designed to
provide. Table 1 describes each of the four categories.
Table 1: Categories of receivers
Category Description
1 A receiver providing this function shall respond to at least one combination of the alert
signal indicator bits. Responses to the remaining seven alert indicator bits shall (if
implemented) be clearly distinguishable.
2 A receiver including this function shall provide for the reception of a 20 digit numeric
message. The numeric character set is included in annex C. Receivers having this
function shall also have the tone-only function.
3 A receiver including this function shall provide for the reception of a 400 character text
message. The alphanumeric character set is included in annex C. Receivers having this
function shall also have the numeric and the tone-only functions.
4 A receiver including this function shall provide for the reception of an arbitrary data
message.
4.6 The requirements and justifications
4.6.1 Average usable sensitivity (normal)
The receiver under test shall meet the specifications as defined in subclause 7.1 a).
The receiver is required to meet the above specification in order to provide sufficient call success rate
under static field conditions when the transmitted field strength is at the defined level. This level has been
chosen as a suitable limit level when economic, technical and regulatory considerations are taken into
account. It is therefore required that receivers shall meet the specification as defined in subclause 7.1 a)
and measured as defined in subclause 7.2 a).
Reference:
ETS 300 133-5 [3], subclause 6.1 i).
4.6.2 Degradation in required sensitivity under channel switching
The receiver under test shall meet the specifications as defined in subclause 7.1 b).
One of the essential features of the ERMES system is that the paging messages are distributed in a
multiple frequency environment. It is therefore required that the receivers maintain their sensitivity to
paging messages while they are scanning through the frequencies used in the system as defined in
subclause 7.1 b) and measured as defined in subclause 7.2 l).
Reference:
ETS 300 133-5 [3], subclause 6.1 iii).
4.6.3 Degradation in required sensitivity in extremes and offset
The receiver under test shall meet the specifications as defined in subclause 7.1 c).
The operating temperature range for the receiver is -10° C to + 55° C. This range should cover the range
of temperatures normally experienced in Europe by a body worn product. The receiver under test is
primarily intended to be portable and therefore its power is derived from a battery. During the life of this
battery, its terminal voltage may change, and to ensure that the performance of the receiver is not
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impaired unreasonably, this test includes measuring the sensitivity of the receiver at the extreme test
voltage as specified by the manufacturer. In the transmitter system that may be used for an ERMES
network, it is possible that the transmitted frequencies could be up to 200 Hz offset from the nominal
frequencies (see ETS 300 133-6 [8], subclause 6.3. It is required that the receiver shall continue to
receive paging messages at the extremes of the temperature and voltage range and with a transmitter
frequency offset of 200 Hz as defined in subclause 7.1 c) and measured as defined in subclause 7.2 c).
References:
ETS 300 133-5 [3], subclause 6.1 v).
ETS 300 133-6 [8], subclause 6.3.
4.6.4 Co-channel rejection (normal)
The receiver under test shall meet the specifications as defined in subclause 7.1 d).
In the transmitter system that may be used for an ERMES network, it is possible that the receiver shall
receive signal from two transmitters on the same frequency, but with different data being transmitted. In
order that paging messages can still be received under these conditions, it is required that the receiver
shall meet the specification as defined in subclause 7.1 d) and measured as defined in subclause 7.2 e).
Reference:
ETS 300 133-5 [3], subclause 6.1 vi).
4.6.5 Adjacent channel selectivity (normal)
The receiver under test shall meet the specifications as defined in subclause 7.1 e).
In the transmitter system that may be used for an ERMES network, it is possible that a receiver may suffer
from radio interference from a signal being transmitted on a channel adjacent to the required channel. In
order that paging messages can still be received under these conditions, it is required that the receiver
shall meet the specification as defined in subclause 7.1 e) and measured as defined in subclause 7.2 f).
Reference:
ETS 300 133-5 [3], subclause 6.1 vii).
4.6.6 Adjacent channel selectivity (extreme)
The receiver under test shall meet the specifications as defined in subclause 7.1 f).
In the transmitter system that may be used for an ERMES network, it is possible that a receiver may suffer
from radio interference from a signal being transmitted on a channel adjacent to the required channel. It is
also possible that the extreme temperature conditions as described in subclause 4.6.3 are also
experienced at the same time. In order that paging messages can still be received under these conditions,
it is required that the receiver shall meet the specification as defined in subclause 7.1 f) and measured as
defined in subclause 7.2 f).
Reference:
ETS 300 133-5 [3], subclause 6.1 viii).
4.6.7 Spurious response immunity
The receiver under test shall meet the specifications as defined in subclause 7.1 g).
In the normal radio environment it is possible that radio signals are presented to the receiver to which the
receiver is not intended to respond. However, the receiver may respond to some of these signals. This
test is concerned with the situation when these un-wanted interfering signals are at particular frequencies
at which the receiver may respond. These frequencies are calculated by considering the design of the
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TBR 7: November 1994
receiver. In order that paging messages can still be received when these un-wanted signals are present
and below the specified limit value, it is required that the receiver shall meet the specification as defined in
subclause 7.1 g) and measured as defined in subclause 7.2 g).
Reference:
ETS 300 133-5 [3], subclause 6.1 ix).
4.6.8 Intermodulation immunity
The receiver under test shall meet the specifications as defined in subclause 7.1 h).
In the normal radio environment it is possible that radio signals are presented to the receiver to which the
receiver is not intended to respond. However, the receiver may respond to some of these un-wanted
interfering signals. This test is concerned with the situation when there are 2 un-wanted interfering signals
which are equidistant from the wanted signal and each other. The probability of this situation occurring
increases as the radio spectrum becomes more crowded. In order that paging messages can still be
received when these un-wanted signals are present and below the specified limit values, it is required that
the receiver shall meet the specification as defined in subclause 7.1 h) and measured as defined in
subclause 7.2 h).
Reference:
ETS 300 133-5 [3], subclause 6.1 x).
4.6.9 Blocking immunity or desensitisation
The receiver under test shall meet the specifications as defined in subclause 7.1 j).
In the normal radio environment it is possible that radio signals are presented to the receiver to which the
receiver is not intended to respond. However, the receiver may respond to some of these un-wanted
interfering signals. This test is concerned with the situation when there is an interfering signal which is not
one of the cases tested in subclause 7.1 h). The probability of this situation occurring increases as the
radio spectrum becomes more crowded. In order that paging messages can still be received when this un-
wanted signal is present and below the specified limit value, it is required that the receiver shall meet the
specification as defined in subclause 7.1 j) and measured as defined in subclause 7.2 j).
Reference:
ETS 300 133-5 [3], subclause 6.1 xi).
4.6.10 Usable input range
The receiver under test shall meet the specifications as defined in subclause 7.1 k).
In the normal radio environment the wanted signal level has a very large amplitude range. The amplitude
of the received signal can vary by at least 100 dB and the receiver is required to operate satisfactorily over
this range. This test is concerned with the situation when there is a high signal amplitude, approximately
105 dB above the sensitivity limit defined in subclause 7.1 a). This test is designed to ensure that the
receiver will still receive paging messages at this high signal level and it is required that the receiver shall
meet the specification as defined in subclause 7.1 k) and measured as defined in subclause 7.2 d).
Reference:
ETS 300 133-5 [3], subclause 6.1 xii).
4.6.11 The maximum degradation in required sensitivity for combined multi-path and quasi-
synchronous transmissions
(See annex B, clause B.8).
The receiver under test shall meet the specifications as defined in subclause 7.1 l).
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In the normal radio environment the received signal will not have come directly from the transmitter but will
have b
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