SIST EN 300 127:2001

• Abstract:

  To bring ETS 300 127 in line with an equivalent ITU-T standard, K.38 (usually referred to as K.large). To i nclude all EMC requirements for large systems.

• Status: Published
• Publication Date: 31-Jan-2001
• ICS: 33.060.20 - Receiving and transmitting equipment
• ICS: 33.100.01 - Electromagnetic compatibility in general
• Technical Committee: RES - Radio equipment and systems
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Feb-2001
• Due Date: 01-Feb-2001
• Completion Date: 01-Feb-2001
• Ref Project: ETSI EN 300 127 V1.2.1 (1999-04) - ElectroMagnetic Compatibility and Radio Spectrum Matters (ERM); Radiated emission testing of physically large telecommunication systems

Overview

SIST EN 300 127:2001 addresses the electromagnetic compatibility (EMC) and radio spectrum requirements for physically large telecommunication systems. Originating from the European Telecommunications Standards Institute (ETSI) and adopted as a Slovenian standard by SIST, this document specifies uniform and practical procedures for measuring radiated emissions from large telecom systems, ensuring they do not interfere with radio communications or other electronic devices. Critically, this standard harmonizes ETS 300 127 with the ITU-T Recommendation K.38 (K.large), encompassing all EMC requirements for such large systems.

Physically large telecommunication systems typically consist of interconnected racks and equipment exceeding standard test site dimensions. The standard applies to systems installed at fixed locations within telecommunications networks, excluding radio equipment. Emphasis is placed on defining a minimum representative system for compliance testing, reflecting real-world installation and operational conditions.

Key Topics

• Minimum Representative System: Defines the essential configuration for testing, including all functional unit types indicative of the installed system, thus ensuring accurate EMC assessment.
• Radiated Emission Testing Procedures: Outlines step-by-step measurement processes using open area test sites (OATS) or compliant chambers, detailing equipment and antenna positions to maximize detection of emissions.
• Cabling and Layout Practices: Specifies handling of both intra-system and interface cabling, including scenarios for unscreened, overhead, and raised floor installations, as well as fully screened systems.
• Functional Module Assessment: Provides guidance on evaluating new modules or upgrades to established systems for ongoing standards compliance.
• Test Reporting Requirements: Lists essential data for documentation, such as system selection rationale, cabling configurations, testing environment, results, and calibration status.
• Test Site Environment: Addresses challenges unique to large installations, including site attenuation, ambient noise, and the inability to move equipment easily.
• Measurement Methodology: Details protocols for antenna placement, scan ranges, polarization, and EUT (Equipment Under Test) orientation for reliable emission data.

Applications

SIST EN 300 127:2001 is essential for:

• Telecommunications Equipment Manufacturers: Ensures new and modified large-scale network equipment complies with EMC regulations before market entry.
• System Integrators and Installers: Provides a repeatable, standardized method for validating installations, particularly in data centers or large telecommunication switches.
• Testing Laboratories: Guides EMC testing of physically large telecom systems, supporting consistent results that are recognized within the European Union and by international bodies.
• Network Operators: Helps in procurement and acceptance testing by verifying compliance minimises the risk of radio interference and system downtime.

The standard’s procedures are also applicable in evaluating the impact of hardware upgrades or new functional modules added to existing systems, ensuring ongoing conformity without always requiring complete retesting.

Related Standards

SIST EN 300 127:2001 references and aligns with several key international EMC standards, including:

• EN 55022: Limits and methods of measurement of radio disturbance characteristics for information technology equipment.
• CISPR 16-1: Specifications for radio disturbance and immunity measuring apparatus and methods, crucial for defining measurement site requirements and procedures.
• IEC 60050-161: International Electrotechnical Vocabulary for electromagnetic compatibility terms and definitions.
• ITU-T Recommendation K.38: The international equivalent standard for testing large telecommunications systems for electromagnetic compatibility.

Other related standards may address specific EMC test methodologies, radio spectrum management, or sectoral requirements depending on regional and technical context.

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Keywords: electromagnetic compatibility, EMC, radiated emission testing, large telecommunication systems, equipment under test, OATS, cabling, screened systems, SIST EN 300 127:2001, ETSI, compliance, telecom EMC standards.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.VLVWHPRYElectroMagnetic Compatibility and Radio Spectrum Matters (ERM); Radiated emission testing of physically large telecommunication systems33.100.01Elektromagnetna združljivost na splošnoElectromagnetic compatibility in general33.060.20Sprejemna in oddajna opremaReceiving and transmitting equipmentICS:Ta slovenski standard je istoveten z:EN 300 127 Version 1.2.1SIST EN 300 127:2001en01-februar-2001SIST EN 300 127:2001SLOVENSKI
STANDARD
EN 300 127 V1.2.1 (1999-04)European Standard (Telecommunications series)Electromagnetic compatibilityand Radio spectrum Matters (ERM);Radiated emission testing of physically largetelecommunication systemsSIST EN 300 127:2001

ETSIEN 300 127 V1.2.1 (1999-04)2ReferenceREN/ERM-EMC-112 (16c00ioo.PDF)KeywordsEMC, emissionETSIPostal addressF-06921 Sophia Antipolis Cedex - FRANCEOffice address650 Route des Lucioles - Sophia AntipolisValbonne - FRANCETel.: [phone]
Fax: [phone]Siret N° 348 623 562 00017 - NAF 742 CAssociation à but non lucratif enregistrée à laSous-Préfecture de Grasse (06) N° 7803/[e-mail] copies of this ETSI deliverablecan be downloaded fromhttp://www.etsi.orgIf you find errors in the present document, send yourcomment to: [e-mail] NotificationNo 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 1999.All rights reserved.SIST EN 300 127:2001

ETSIEN 300 127 V1.2.1 (1999-04)3ContentsIntellectual Property Rights.4Foreword.41Scope.52References.53Definitions and abbreviations.53.1Definitions.53.2Abbreviations.64Requirements.64.1Determination of minimum representative system.64.2New functional modules.65General operational conditions.65.1Equipment configuration.65.1.1Equipment boundary.75.2Equipment cable layout.75.2.1Intra-system cabling.75.2.2Interface cabling.75.2.2.1Unscreened cable systems.75.2.2.1.1Overhead cable systems.75.2.2.1.2Raised floors.85.2.2.2Screened cable systems.85.3Exercising equipment.85.4Laboratory environment.86Test results report.97Test site requirements.98Measurement method.10History.15SIST EN 300 127:2001

ETSIEN 300 127 V1.2.1 (1999-04)4Intellectual Property RightsIPRs essential or potentially essential to the present document may have been declared to ETSI. The informationpertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be foundin SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respectof ETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on theETSI Web server (http://www.etsi.org/ipr).Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guaranteecan be given as to the existence of other IPRs not referenced in SR 000 314 (or the updates on the ETSI Web server)which are, or may be, or may become, essential to the present document.ForewordThis European Standard (Telecommunications series) has been produced by ETSI Technical CommitteeElectromagnetic compatibility and Radio spectrum Matters (ERM).The present document specifies the technical requirements for the radiated emission measurement procedure forphysically large systems used within the public telecommunication network. A minimum representative system isdefined, which is used for compliance testing of physically large telecommunication systems. National transposition datesDate of adoption of this EN:26 March 1999Date of latest announcement of this EN (doa):30 June 1999Date of latest publication of new National Standardor endorsement of this EN (dop/e):31 December 1999Date of withdrawal of any conflicting National Standard (dow):31 December 1999SIST EN 300 127:2001

ETSIEN 300 127 V1.2.1 (1999-04)51ScopeThe present document specifies the technical requirements for the radiated emission measurement procedure forphysically large systems used within the telecommunication network, with the exception of radio equipment.It applies to physically large systems which are comprised of equipment (or systems) requiring installationdocumentation specific for those sites at which they are to be installed. In order to demonstrate compliance of suchsystems, a minimum representative system is defined, which is used for compliance testing. Installations built from unitsof the complying minimum representative system are deemed to satisfy the radiated emission requirements.The minimum representative system is representative of installed systems in terms of function (which includes at leastone of each functional unit type) and electromagnetic radiation characteristics. The minimum representative system issubsequently referred to in the present document as the Equipment Under Test (EUT), to be used for compliance testing.2ReferencesThe following documents contain provisions which, through reference in this text, constitute provisions of the presentdocument.· References are either specific (identified by date of publication, edition number, version number, etc.) ornon-specific.· For a specific reference, subsequent revisions do not apply.· For a non-specific reference, the latest version applies.· A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the samenumber.[1]EN 55022 (1987): "Limits and methods of measurement of radio disturbance characteristics ofinformation technology equipment".[2]CISPR 16-1: "Specification for radio disturbance and immunity measuring apparatus andmethods - Part 1: Radio disturbance and immunity measuring apparatus".[3]IEC 60050-161 (1990): "International Electrotechnical Vocabulary. Chapter 161: Electromagneticcompatibility".3Definitions and abbreviations3.1DefinitionsFor the purposes of the present document, the following definitions, together with those from IEC 60050-161 [3], apply:system: set of sub-systems which, when connected together, produce a fully operational product and is intended to bemarketed as suchsub-system: grouping of functional units which perform specific functions within the host system and whichcommunicates with other equipment via well-defined interfaces and protocolsfunctional unit: grouping of electronic hardware which performs specific functions, but may be connected with otherfunctional units to produce the required sub-systemnew functional module: replacement and/or addition for any grouping or arrangement of electronic hardware (with itsassociated mechanical packaging and interconnections), which enhances or improves the system operationtest site: this should be an OATS, with reflecting ground plane, or a suitable chamber with reflecting ground planeSIST EN 300 127:2001

ETSIEN 300 127 V1.2.1 (1999-04)6minimum representative system: system which contains the minimum number of units needed to perform all functionsspecified for the systemcable distribution point: cable distribution point is the interface at which cabling shall be terminated; this unit is thepoint at which cabling from the system is connected to the cabling from external unitsphysically large system: group of racks functionally connected to form a commercially specified system, which has atotal dimension exceeding that which is practical for testing on a conventional 10 m test site3.2AbbreviationsFor the purposes of the present document, the following abbreviations apply:EUTEquipment Under TestOATSOpen Area Test Site4RequirementsThe recommended method for determining the minimum representative system is given here.4.1Determination of minimum representative systemThe minimum representative system is representative of installed systems in terms of function (which includes at leastone of each functional unit type) and electromagnetic radiation characteristics. This shall be equipped to at least theminimum configuration which could be offered for sale for use as an actual system. It excludes any operationalequipment connected for the purpose of monitoring or system measurements and which are connected for a temporaryperiod. An example of how the EUT is to be selected is given in figure 1.Minimum representative systems shall be tested on an Open Area Test Site (OATS) or in a suitable chamber, the limitsto be used are those as specified in EN 55022 [1].4.2New functional modulesFunctional modules used in the system tests may be individually characterized in a defined test facility (seesubclause 5.1). This characterization may then be used as a reference to determine the effect of any significant designchanges.Using this technique, the performance of new functional modules may be assessed and the test plan written in such away as to demonstrate that the representative system continues to conform when a functional module has been replacedby a new functional module. The results obtained for new functional modules shall be compared with those from theprevious module.The manufacturer shall clearly demonstrate and document the reasons why a new functional module does not require acomplete representative system re-test. If the module constitutes a major change to the system configuration, a c
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