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

SIST EN 300 127:2001 is the Slovenian adoption of EN 300 127 V1.2.1, a European telecommunications standard from ETSI. It specifies how to test radiated emissions from physically large telecommunication systems used in public networks, so manufacturers and test labs can assess conformity using a minimum representative system.

What does SIST EN 300 127:2001 specify?

SIST EN 300 127:2001 specifies the radiated emission measurement procedure for physically large systems used in the telecommunication network, excluding radio equipment. It also defines how to build the minimum representative system that stands in for a real installation during compliance testing.

The document is organized into scope, references, definitions and abbreviations, requirements, test reporting, test site requirements, and measurement method. The practical focus is not on product design, but on how to assemble the test item, arrange cabling, choose the test site, and record the results so the emission test is repeatable.

What are the key requirements of SIST EN 300 127:2001?

SIST EN 300 127:2001 centers on how to select, configure, and measure a representative installation so the emission results reflect a real system. The key point is that the test article is not just one device, but the smallest practical system that still represents the installed product.

Minimum representative system and EUT

Clause 4.1 requires a minimum representative system with at least one of each functional unit type and the minimum configuration that could be sold as an actual system. Temporary monitoring or measurement equipment is excluded. In practice, this means the test setup should reflect a real installation, not a laboratory-only arrangement.

Clause 4.1 also says the minimum representative system is the Equipment Under Test (EUT). It is tested on an Open Area Test Site (OATS) or in a suitable chamber, using the limits from EN 55022.

New functional modules

Clause 4.2 allows individual characterization of new functional modules. The manufacturer must compare the new module with the previous one and document why a full retest of the representative system is not needed. If the module is a major configuration change, a complete representative system test is required. This matters when a product family changes over time and the test plan must show that the emission behavior has not changed in a material way.

Installation, cabling, and boundary definition

Clause 5.1 requires the EUT to follow the manufacturer’s normal installation practice. The minimum set of interface lines needed for operation must be defined and reported. The sources of highest emission are found by measuring each functional unit individually and, where relevant, by rack position.

Clause 5.1.1 defines the equipment boundary as the straight-line envelope around the EUT, including the cables attached for test. Measurement distance is taken from that boundary.

Clause 5.2 sets the cable layout. Internal cabling must be typical of normal operation. For overhead cable systems, cables run horizontally for 1.5 m before dropping to the ground plane. For raised-floor systems, exposed unscreened cabling is placed at 10 cm height when the raised floor is not part of the screen. For screened cable systems, the test arrangement must expose any unscreened cabling to the measurement antenna, and the screened length between the system and unscreened distribution point should be the minimum real installation length, typically 10 m unless otherwise specified.

Test conditions and measurement method

Clause 5.3 requires the exercising equipment to be isolated so it does not affect the result. Clause 5.4 ties the laboratory environment to the manufacturer’s operating climatic conditions unless otherwise specified.

Clause 7 requires a test site that meets CISPR 16-1 site attenuation requirements, typically an OATS with a reflecting ground plane or a suitable chamber. Clause 8 requires the EUT to operate in its functional mode and be exercised to maximize emissions. The antenna is scanned from 1 m to 4 m in both horizontal and vertical polarization at 10 m distance. The measurement may use eight radials, or one direction only if the EUT meets the limits minus 10 dB in that direction.

Test reporting

Clause 6 requires the report to capture the selection of the EUT, cable layout, distribution point details, emission-maximizing actions, exercising equipment, operating modes, test conditions, results, calibration status, test site description, EUT composition, and the software used to exercise the EUT. In practice, this is what makes the test defensible and repeatable.

What terms does SIST EN 300 127:2001 define?

• System - a set of sub-systems that together form a fully operational product intended for sale as a unit.
• Sub-system - a grouping of functional units that performs specific functions and communicates through defined interfaces and protocols.
• Functional unit - a grouping of electronic hardware that performs a specific function within the system.
• New functional module - a replacement or added grouping of hardware, packaging, and interconnections that improves system operation.
• Minimum representative system - the smallest system that contains the minimum units needed to perform all specified functions.
• Cable distribution point - the interface where cabling is terminated and connected to external cabling.
• Physically large system - a group of racks whose total dimensions are too large for practical testing on a conventional 10 m test site.
• EUT - Equipment Under Test, the representative system used in the compliance test.
• OATS - Open Area Test Site, a test site with a reflecting ground plane.

Who uses SIST EN 300 127:2001?

SIST EN 300 127:2001 is used by manufacturers of physically large telecommunication systems, EMC test laboratories, and compliance engineers working on public telecommunication network equipment. Quality managers use it to define what must be tested and documented, while buyers and specifiers can use it to state how emissions are to be verified for large installed systems.

What changed in SIST EN 300 127:2001 from the previous edition?

SIST EN 300 127:2001 aligns ETS 300 127 with the equivalent ITU-T standard K.38, usually referred to as K.large. It also brings together the EMC requirements for large systems in this document.

Which standards are used with SIST EN 300 127:2001?

• EN 55022 - provides the emission limits used for the minimum representative system and supports the test arrangement for large equipment.
• CISPR 16-1 - provides the radio disturbance measuring apparatus requirements and the site attenuation requirements for the test site.
• IEC 60050-161 - provides EMC vocabulary used alongside the definitions in the document.

What does the SIST EN 300 127:2001 document contain?

SIST EN 300 127:2001 contains the procedure for selecting a representative system, arranging cables, defining the equipment boundary, and setting up the test site for radiated emission measurements. It also includes reporting requirements so the test record shows how the EUT was chosen and exercised.

The figures give practical examples of the representative system selection and of three common installation cases: overhead cable systems, raised-floor systems, and screened cable systems with an unscreened distribution point. Another figure shows the 8-radial measurement site layout used for one of the permitted measurement approaches.

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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