SIST EN 302 217-1 V1.1.4:2006
(Main)Fixed Radio Systems; Characteristics and requirements for point-to-point equipment and antennas; Part 1: Overview and system-independent common characteristics
Fixed Radio Systems; Characteristics and requirements for point-to-point equipment and antennas; Part 1: Overview and system-independent common characteristics
Through the notification of the UK interface regulation, the European Commission have strongly requested that ETSI TM4 consider a rationalisation of the number of fixed terrestrial (point-to-point) standards. This work item is therefore in response to this request and aims to simplify (and rationalise the number of) existing standards. This work item is to appraise only the published ETSI fixed terrestrial (point-to-point) radio relay standards and consolidate these into the new style generic format . The primary intention will be to rationalise the existing number of standards, in excess of 30, to just a handful, e.g. ideally 5. These standards will then be proposed as Harmonised Standards. The preferred method of segmentation is yet to be decided, but this may be on the basis of (frequency range or application or traffic capacity). Annex A illustrates possible segmentation options. The work will only consolidate new or existing work items on standards if the output deliverables are formally published before the completion of this work activity. Further, this work item does not, in principle, propose to change any existing technical parameter values, although the presentation of data/information may be modified to enhance understanding and usability leading to some new or revised requirements. The format shall be consistent across the range of standards which are segmented under the preferred method.
Fiksni radijski sistemi – Karakteristike in zahteve za opremo in antene tipa točka-točka – 1. del: Pregled in splošne od sistema neodvisne karakteristike
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 302 217-1 V1.1.4:2006
01-april-2006
)LNVQLUDGLMVNLVLVWHPL±.DUDNWHULVWLNHLQ]DKWHYH]DRSUHPRLQDQWHQHWLSDWRþND
WRþND±GHO 3UHJOHGLQVSORãQHRGVLVWHPDQHRGYLVQHNDUDNWHULVWLNH
Fixed Radio Systems; Characteristics and requirements for point-to-point equipment and
antennas; Part 1: Overview and system-independent common characteristics
Ta slovenski standard je istoveten z: EN 302 217-1 Version 1.1.4
ICS:
33.060.30 Radiorelejni in fiksni satelitski Radio relay and fixed satellite
komunikacijski sistemi communications systems
33.120.40 Antene Aerials
SIST EN 302 217-1 V1.1.4:2006 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 302 217-1 V1.1.4:2006
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SIST EN 302 217-1 V1.1.4:2006
ETSI EN 302 217-1 V1.1.4 (2005-11)
European Standard (Telecommunications series)
Fixed Radio Systems;
Characteristics and requirements for point-to-point
equipment and antennas;
Part 1: Overview and system-independent
common characteristics
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SIST EN 302 217-1 V1.1.4:2006
2 ETSI EN 302 217-1 V1.1.4 (2005-11)
Reference
REN/TM-04132-1
Keywords
antenna, DFRS, digital, DRRS, FWA,
point-to-point, radio, transmission
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SIST EN 302 217-1 V1.1.4:2006
3 ETSI EN 302 217-1 V1.1.4 (2005-11)
Contents
Intellectual Property Rights.4
Foreword.4
Introduction .4
Generality 4
Cross references to previous relevant ENs.6
User's guide .10
1 Scope.12
2 References.12
3 Definitions, symbols and abbreviations .15
3.1 Definitions.15
3.2 Symbols.18
3.3 Abbreviations.19
4 General characteristics.21
4.1 Performance and availability requirements .21
4.2 Environmental profiles.21
4.2.1 Environmental profile declared under the R&TTE Directive.21
4.2.2 Voluntary ETSI environmental profile .22
4.2.2.1 Equipment within weather-protected locations (indoor locations).22
4.2.2.2 Equipment for not-weather-protected locations (outdoor locations).22
4.2.3 Test environment profiles .22
4.3 Power supply.22
4.3.1 Power supply profile declared under the R&TTE Directive.23
4.3.2 Voluntary ETSI power supply profile.23
4.4 System block diagram .23
5 Baseband interfaces and parameters.24
5.1 Plesiochronous interfaces.24
5.2 ISDN interfaces.24
5.3 Synchronous digital hierarchy interfaces .24
5.4 Other baseband data interfaces.24
Annex A (informative): Miscellaneous characteristics.25
A.1 Telecommunications Management Network (TMN) interface .25
A.2 Mechanical characteristics.25
Annex B (informative): Notification of interfaces under Article 4.1 of the R&TTE Directive .26
B.1 Applicability of TCAM-RIG format of radio interface specifications to Fixed Services .26
B.2 Proposed list of radio interface specifications for Fixed Services.27
Annex C (informative): Bibliography.28
History .31
ETSI
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SIST EN 302 217-1 V1.1.4:2006
4 ETSI EN 302 217-1 V1.1.4 (2005-11)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://webapp.etsi.org/IPR/home.asp).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This European Standard (Telecommunications series) has been produced by ETSI Technical Committee Transmission
and Multiplexing (TM).
The present document is part 1 of a multi-part deliverable covering the Fixed Radio Systems; Characteristics and
requirements for point-to-point equipment and antennas, as identified below:
Part 1: "Overview and system-independent common characteristics";
Part 2-1: "System-dependent requirements for digital systems operating in frequency bands where frequency
co-ordination is applied";
Part 2-2 "Harmonized EN covering essential requirements of Article 3.2 of R&TTE Directive for digital systems
operating in frequency bands where frequency co-ordination is applied";
Part 3: "Harmonized EN covering essential requirements of Article 3.2 of R&TTE Directive for equipment
operating in frequency bands where no frequency co-ordination is applied";
Part 4-1: "System-dependent requirements for antennas";
Part 4-2: "Harmonized EN covering essential requirements of Article 3.2 of R&TTE Directive for antennas".
National transposition dates
Date of latest announcement of this EN (doa): 28 February 2006
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 August 2006
Date of withdrawal of any conflicting National Standard (dow): 31 August 2006
Introduction
Generality
Digital Fixed Radio Systems (DFRS), used in European countries, have been specified up to now in a relatively large
number of specific European Norms produced by ETSI.
ETSI
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SIST EN 302 217-1 V1.1.4:2006
5 ETSI EN 302 217-1 V1.1.4 (2005-11)
Previous documents, to be replaced by EN 302 217 series, contained both essential requirements, cross-referenced in
EN 301 751 (see bibliography), and other requirements that, even if not considered essential under the Directive
1999/5/EC [1] of the European Parliament and of the Council of 9 March 1999 on radio equipment and
telecommunications terminal equipment and the mutual recognition of their conformity (hereafter mentioned as the
R&TTE Directive) [1], may be applicable.
Existing standards for point-to-point systems, including antennas, cover a very large range of traffic capacities, channel
separations, modulation formats and applications over a very wide range of frequency bands that are summarized in
table 1.
Table 1: Digital Fixed Radio Systems (DFRS) parameters
Parameter Range
Frequency bands from 1 GHz to 58 GHz
Traffic capacities from 9,6 kbit/s to 622 Mbit/s
Channel separations from 25 kHz to 112 MHz
Modulation formats from 2 to 512 states (amplitude and/or phase and/or frequency modulated
states)
Typical applications POINT-TO-POINT (P-P) CONNECTIONS:
rural and urban low/medium/high capacity links for mobile infrastructure,
transport/trunk (long haul), FWA/BFWA backhaul, access, governmental
(non-military) links, private fixed networks, SAP/SAB P to P audio and video
links
STAND ALONE ANTENNAS:
for all of the above applications when integral antennas are not employed
The new regulatory framework for placing radio systems on the market, established by the R&TTE Directive [1] also
requires the availability of Harmonized ENs covering the essential requirements under article 3.2 of the R&TTE
Directive [1]. This was achieved in the first instance by the harmonized EN 301 751 (see bibliography), which
cross-references to the relevant clauses of the ENs in table 2, dealing with those essential requirements. However, as a
long-term solution, an EN 302 217 series including stand-alone harmonized ENs containing all necessary information
and avoiding as much as is practical cross-references, better suits regulatory and market requirements.
EN 302 217 series (see bibliography) meets this demand by providing a rational subdivision of requirements into
general, system dependent "not essential" and "essential" requirements from the perspective of the R&TTE
Directive [1].
Part 1 includes system-independent common characteristics; these requirements are not essential under article 3.2 of the
R&TTE Directive [1].
EN 302 217-2-2, EN 302 217-3 and EN 302 217-4-2 (see bibliography) relevant to essential requirements under
article 3.2 of the R&TTE Directive [1] replicate, within the scope and applicability of the R&TTE Directive [1], the
requirements set out in harmonized EN 301 751 (see bibliography).
NOTE 1: It is proposed that the date of cessation of presumption of conformity to the R&TTE Directive [1] with
reference to harmonized EN 301 751 (see bibliography) be kept two years after the date of publication in
the OJ EC of the present document.
EN 302 217 series introduces, for systems (equipment and antennas) already covered by EN 301 751 (see bibliography),
only technically equivalent or less stringent requirements (see note 2). Care has been taken so that such variations will
not affect any frequency planning assumption for already deployed networks. Therefore, from a strictly technical point
of view, it is expected that equipment already conforming to EN 301 751 (see bibliography), would not need a new test
report for re-assessment of essential requirements according EN 302 217 series (see note 1). Legal implications with
respect to declaration of conformity and equipment labelling are outside the scope of the present document.
NOTE 2: The only exception is with respect to class 5A equipment for system D.7 (see annex D of
EN 302 217-2-2) and for systems E.1, E.2 and E.3 (see annex E of EN 302 217-2-2) for which a previous
design objective has here been transformed into a more stringent RSL versus BER. In this case a
supplementary test report might be required (e.g. in case the technical construction file, made for
declaration of conformity to EN 301 751 (see bibliography), does not give evidence of enough margin to
fulfil the requirements of the present document).
ETSI
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SIST EN 302 217-1 V1.1.4:2006
6 ETSI EN 302 217-1 V1.1.4 (2005-11)
In the present document, the equipment subject of the former standards is grouped into families of either similar
frequency bands or applications. Five families are identified for frequency bands where frequency co-ordination is
applied, corresponding, in both EN 302 217-2-1 and EN 302 217-2-2 (see bibliography), to annexes referenced from A
to E and one family associated with applications of packet data and combination of other signals mapped into
proprietary transport modules, detailed in annex F.
• A frequency bands from 1,4 GHz to 2,7 GHz;
• B frequency bands from 3 GHz to 11 GHz (channel separation up to around 30 MHz);
• C frequency bands from 3 GHz to 11 GHz (channel separation 40 MHz);
• D frequency bands 13 GHz, 15 GHz and 18 GHz;
• E frequency bands from 23 GHz to 55 GHz;
• F transmission of Packet Data and combination of other signals.
Cross references to previous relevant ENs
The EN 302 217 series will replace and supersede, after a suitable transition period, the standards that are listed in
table 2 (sorted by ascending EN number). Table 2 provides also an overview of the correspondence between equipment
considered in those ENs and part/annexes in the present document.
Requirements in the previous ENs have been rationalized and redistributed in the present document according to a logic
subdivision dictated by the coming into force of the R&TTE Directive [1]:
• requirements considered essential under article 3.2 of the R&TTE Directive [1] have been placed in the
relevant harmonized ENs EN 302 217-2-2, EN 302 217-3 and EN 302 217-4-2 (see bibliography);
• other requirements that, even if not considered essential under the R&TTE Directive [1], may be applicable,
on a voluntary basis, as a common basis for maintaining performance and operability of DFRS in typical
deployment, have been placed in the relevant ENs, EN 302 217-1, EN 302 217-2-1 and EN 302 217-4-1 (see
bibliography).
Table 2: List of ETSI standards that will be replaced and superseded by the EN 302 217 series
Equipment and antenna standards (see note 3)
ETSI
Version Title Fixed Service Channel Relevant parts and
Reference frequency separation annexes of
number bands of (MHz) EN 302 217 series
operation (see note 2)
(see note 1)
EN 300 197 V1.6.x Parameters for radio systems for the 32 GHz and 3,5 to 56 Annex E
transmission of digital signals operating 38 GHz EN 302 217-2-1 and
at 32 GHz and 38 GHz EN 302 217-2-2
EN 300 198 V1.5.x Parameters for radio systems for the 23 GHz 3,5 to 56 Annex E
transmission of digital signals operating EN 302 217-2-1 and
at 23 GHz EN 302 217-2-2
EN 300 234 V1.3.x High capacity digital radio systems any from 28 to 30 Annexes B and D
carrying 1 x STM-1 signals and 4 GHz EN 302 217-2-1 and
operating in frequency bands with to 15 GHz EN 302 217-2-2
about 30 MHz channel spacing and
alternated arrangements
EN 300 407 V1.3.x Parameters for digital radio systems for 55 GHz 3,5 to 56 Annex E
the transmission of digital signals EN 302 217-2-1 and
operating at 55 GHz EN 302 217-2-2
EN 300 408 V1.3.x Parameters for digital radio systems for 58 GHz 50 and 100 EN 302 217-3
the transmission of digital signals and
analogue video signals operating at
around 58 GHz, which do not require
co-ordinated frequency planning
ETSI
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SIST EN 302 217-1 V1.1.4:2006
7 ETSI EN 302 217-1 V1.1.4 (2005-11)
Equipment and antenna standards (see note 3)
ETSI Version Title Fixed Service Channel Relevant parts and
Reference frequency separation annexes of
number bands of (MHz) EN 302 217 series
operation (see note 2)
(see note 1)
EN 300 430 V1.4.x Parameters for radio systems for the 18 GHz 27,5 and 55 Annex D
transmission of STM-1 digital signals EN 302 217-2-1 and
operating in the 18 GHz frequency EN 302 217-2-2
band with channel spacing of
55 MHz and 27,5 MHz
EN 300 431 V1.4.x Parameters for radio system for the 26 GHz and 3,5 to 56 Annex E
transmission of digital signals operating 28 GHz EN 302 217-2-1 and
in the frequency range EN 302 217-2-2
24,5 GHz to 29,5 GHz
EN 300 630 V1.3.x Low capacity point-to-point digital radio 1,4 GHz 0,025 to 3,5 Annex A
systems in the 1,4 GHz frequency band EN 302 217-2-1 and
EN 302 217-2-2
EN 300 631 V1.2.x Antennas for point-to-point fixed radio any from n.a. EN 302 217-4-1 and
systems in the 1 GHz to 3 GHz band 1 GHz to EN 302 217-4-2
3 GHz
EN 300 633 V1.3.x Low and medium capacity point-to-point any from 0,5 to 14 Annex A
digital radio systems 2,1 GHz to 2,6 EN 302 217-2-1 and
operating in the frequency range GHz EN 302 217-2-2
2,1 GHz to 2,6 GHz
EN 300 639 V1.3.x Sub STM-1 digital radio systems 13 GHz, 14 and 28 Annex D
operating in the 13 GHz, 15 GHz and 15 GHz and EN 302 217-2-1 and
18 GHz frequency bands with about 28 18 GHz EN 302 217-2-2
MHz co-polar and 14 MHz cross-polar
channel spacing
EN 300 786 V1.3.x Sub STM-1 digital radio systems in the 13 GHz, 14 Annex D
13 GHz, 15 GHz and 18 GHz frequency 15 GHz and EN 302 217-2-1 and
bands with about 14 MHz co-polar 18 GHz EN 302 217-2-2
channel spacing
EN 300 833 V1.4.x Antennas for point-to-point fixed radio any from n.a. EN 302 217-4-1 and
systems operating in the frequency 3 GHz EN 302 217-4-2
band 3 GHz to 60 GHz to 60 GHz
EN 301 127 V1.3.x High capacity digital radio systems any from 28 to 30 Annexes B and D
carrying SDH signals (2 x STM-1) in EN 302 217-2-1 and
4 GHz
frequency bands with about 30 MHz to 15 GHz EN 302 217-2-2
channel spacing and using Co-Channel
Dual-Polarized (CCDP) operation
EN 301 128 V1.2.x PDH low and medium capacity digital 13 GHz, 1,75 to 28 Annex D
radio systems operating in the 13 GHz, 15 GHz and EN 302 217-2-1 and
15 GHz and 18 GHz frequency bands 18 GHz EN 302 217-2-2
EN 301 216 V1.2.x PDH low and medium capacity and any from 1,75 to 30 Annex B
STM-0 digital radio systems operating 3 GHz EN 302 217-2-1 and
in the frequency bands to 11 GHz EN 302 217-2-2
in the range 3 GHz to 11 GHz
EN 301 277 V1.2.x High capacity digital radio systems any from 40 Annex C
transmitting STM-4 or 4 x STM-1 in a 4 GHz EN 302 217-2-1 and
40 MHz radio frequency channel using to 11 GHz EN 302 217-2-2
Co-Channel Dual Polarized (CCDP)
operation
EN 301 387 V1.2.x PDH low and medium capacity digital 50 GHz 3,5 to 28 Annex E
radio systems operating in the EN 302 217-2-1 and
frequency band 48,5GHz to 50,2 GHz EN 302 217-2-2
EN 301 461 V1.3.x High capacity fixed radio systems any from 40 Annex C
carrying SDH signals (2 x STM-1) in 4 GHz EN 302 217-2-1 and
frequency bands with 40 MHz channel to 11 GHz EN 302 217-2-2
spacing and using Co-Channel
Dual-Polarized (CCDP) operation
EN 301 669 V1.2.x High capacity digital radio systems any from 40 Annex C
carrying STM-4 in two 40 MHz 4 GHz EN 302 217-2-1 and
channels or 2 x STM-1 in a 40 MHz to 11 GHz EN 302 217-2-2
channel with alternate channel
arrangement
ETSI
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SIST EN 302 217-1 V1.1.4:2006
8 ETSI EN 302 217-1 V1.1.4 (2005-11)
Equipment and antenna standards (see note 3)
ETSI Version Title Fixed Service Channel Relevant parts and
Reference frequency separation annexes of
number bands of (MHz) EN 302 217 series
operation (see note 2)
(see note 1)
EN 301 785 V1.2.x Parameters for packet data radio 7 GHz to 1,75 to 56 Annex F
systems for transmission of digital 55 GHz EN 302 217-2-1 and
signals operating in the frequency EN 302 217-2-2
range 7, 8, 13, 15, 18, 23, 26, 28, 32,
38, 52 to 55 GHz
EN 301 786 V1.2.x Parameters for digital radio systems for 52 GHz 3,5 to 56 Annex E
the transmission of digital signals EN 302 217-2-1 and
operating at 52 GHz EN 302 217-2-2
EN 301 787 V1.1.x Parameters for radio systems for the 18GHz 3,5 Annex D
transmission of Sub-STM-0 digital EN 302 217-2-1 and
signals operating in the 18 GHz EN 302 217-2-2
frequency band
EN 302 062 V.1.1.x High capacity digital radio systems 15 GHz, 55/56 Annexes D and E
carrying 18 GHz, and EN 302 217-2-1 and
2 x STM-1, 4 x STM-1 or STM-4 signals 23 GHz, 110/112 EN 302 217-2-2
in frequency bands with 55/56 MHz 26 GHz,
channel spacing 32 GHz and
38 GHz
NOTE 1: The frequency band identification is taken from the approximate centre frequency as commonly used in
Fixed Service ITU-R Recommendations; it also includes national frequency bands that may slightly differ
from each other but are commonly referred to by the same term.
NOTE 2: The reference of the annex where system specific requirements and characteristics are introduced is the
same for EN 302 217-2-1 and EN 302 217-2-2 (see bibliography), respectively.
NOTE 3: All references in this table are found in the bibliography.
The characteristics of equipment considered in those ENs have also been rationalized, recompacted and resubdivided
into different annexes and sub-annexes/systems in the various sub-parts of this EN 302 217 series (see bibliography).
Table 3 summarizes the relevant cross-reference between radio frequency and other requirements of equipment in
various Fixed Service frequency bands and the relevant sub-parts and annexes of this EN 302 217 series (see
bibliography).
ETSI
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SIST EN 302 217-1 V1.1.4:2006
9 ETSI EN 302 217-1 V1.1.4 (2005-11)
Table 3: Cross reference of equipment requirements, parts, sub-parts and annexes
EN 302 217
System
independent
Part 1
common
characteristics
Antenna
EN 302 217-4-1 and EN 302 217-4-2
characteristics
Sub-
Sub-systems in Sub-systems in
systems in
relevant Sub-systems in annexes B and C of annexes D of Sub-systems in annex E of
annexes A Part 3
annexes and parts 2-1 and 2-2 parts 2-1 and 2- parts 2-1 and 2-2
of parts 2-1
EN parts 2
and 2-2
Frequency 2,1/
1,4 3,5/4 5 L6 U6 7/8 10,5 11 13 15 18 23 26/28 31 32 38 50 52 55 58
band (GHz) 2,6
System
capacity
(payloads)
PDH
A.1 A.2 B.1 − B.1 B.1 B.1 B.1 − D.1 D.1 D.1 E.1 E.2 E.3 E.3 E.3 E.5 E.6 E.7
systems
D.3 D.3 D.3
STM-0 − − B.1 − B.1 B.1 B.1 B.1 − E.1 E.2 E.3 E.3 E.3 − E.6 E.7
D.4 D.4 D.4
SubSTM-0 D.2
− − − − − − − − − − − − − − − − − − −
Any
B.2
STM-1 B.3 C.1 C.1 C.1 D.5
B.2 B.2 B.2 D.5 D.7 E.1 E2 E.3 E.3
NxSTM-1 − − C.1 C.2 C.2 C.2 D.6 E.3 − E.6 E.7
B.3 B.3 B.3 D.6 D.8 E.4 E.4 E.4 E.4
STM-4
C.2 C.3 C.3 C.3 D.8
C.3
Packet data
and mixed Annex F of parts 2-1 and 2-2
interfaces
ETSI
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SIST EN 302 217-1 V1.1.4:2006
10 ETSI EN 302 217-1 V1.1.4 (2005-11)
User's guide
With reference to the former standards listed in table 2, the present EN series provides the same set of characteristics
and requirements, with the same values. However, this information is presented differently, spread across six parts
corresponding to three categories.
The first category (the present document) corresponds to characteristics which are either common to the whole family
of equipment or are provided in a comprehensive list, i.e. performance and availability, environmental profiles, power
supply, system block diagram, TMN interface, mechanical characteristics and baseband interfaces and parameters. The
symbols and abbreviations, which apply to the EN 302 217 series, are listed in the present document. The present
document defines those requirements and characteristics set out in the other parts of this EN 302 217 series.
The second category (EN 302 217-2-1and EN 302 217-4-1 in the bibliography) corresponds to characteristics and
requirements, which are not relevant to article 3.2 of the R&TTE Directive [1]. Nevertheless, compliance to all or some
of these requirements is mandatory in order to claim compliance with the relevant part of the EN 302 217 series.
Requirements are either "main requirements" or "complementary requirements". Even though compliance to these parts
is not mandatory for the R&TTE Directive [1] conformity, compliance may be claimed to all or some requirements of
these parts.
EN 302 217-2-1 and EN 302 217-4-1 (see bibliography) provide a description of the main and complementary
requirements, for equipment operating in co-ordinated frequency bands and for antennas.
Main requirements are requirements that are also related to the "essential requirements" under article 3.2 of the R&TTE
Directive [1] and are further detailed in EN 302 217-2-2 and EN 302 217-4-2 (see bibliography) of this EN 302 217
series; for equipment operating in co-ordinated frequency bands (part 2-2) and for antennas (part 4-2), respectively.
Complementary requirements are requirements that are not related to essential requirements under article 3.2 of the
R&TTE Directive [1]. Nevertheless they are considered, having been commonly agreed for proper system operation and
deployment when specific deployment conditions or compatibility requirements are present. Compliance to all or some
of these requirements is made on a voluntary basis.
The limiting values for main and complementary requirements that are not common to all of the equipment covered by
one part, but specific to one frequency range, one hierarchy (PDH or SDH), one capacity, etc, are located in annexes
which may be further divided into sub-annexes. A sub-annex, when created, is dedicated to one system, described by
the association of the range of capacities, the range of frequencies and the range of channel separations.
The third category (EN 302 217-2-2, EN 302 217-3 and EN 302 217-4-2) corresponds to essential phenomena, with
respect to article 3.2 of the R&TTE Directive [1] and are consequently candidate-harmonized standards. The
requirements are provided in the same way as in EN 302 217-2-1and EN 302 217-4-1. The limiting values associated
with the essential requirements which are not common to all of the equipment covered by one part, but specific to one
frequency range, one hierarchy (PDH or SDH), one capacity, etc, are located in annexes wh
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