EN 60875-1:2001

SLOVENSKI SIST EN 60875-1:2002
prva izdaja
STANDARD
september 2002
Non-wavelenght-selective fibre optic branching devices - Part 1: Generic
specification (IEC 60875-1:2000)
ICS 33.180.20 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD EN 60875-1
NORME EUROPÉENNE
EUROPÄISCHE NORM March 2001
ICS 33.180.20 Supersedes EN 60875-1:1998
English version
Non-wavelength-selective fibre optic branching devices
Part 1: Generic specification
(IEC 60875-1:2000)
Dispositifs de couplage pour fibres Lichtwellenleiter-Verzweiger
optiques ne dépendant pas (Wellenlängenunabhängig)
de la longueur d'onde Teil 1: Fachgrundspezifikation
Partie 1: Spécification générique (IEC 60875-1:2000)
(CEI 60875-1:2000)
This European Standard was approved by CENELEC on 2000-11-01. CENELEC members are bound
to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,
Portugal, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60875-1:2001 E
Foreword
The text of document 86B/1361/FDIS, future edition 4 of IEC 60875-1, prepared by SC 86B, Fibre
optic interconnecting devices and passive components, of IEC TC 86, Fibre optics, was submitted to
the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60875-1 on 2000-11-01.
This European Standard supersedes EN 60875-1:1998.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2001-08-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2003-11-01
Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annex ZA is normative and annex A is informative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60875-1:2000 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60068 NOTE: Harmonized in the EN 60068 and HD 323 series (not modified).
IEC 60874 NOTE: Partly harmonized as EN 60874 series.
IEC 61753 NOTE: Partly harmonized as EN 61753 series.
IEC 61754-2 NOTE: Harmonized as EN 61754-2:1997 (not modified).
IEC 61754-4 NOTE: Harmonized as EN 61754-4:1997 (not modified).
IEC 61754-13 NOTE: Harmonized as EN 61574-13:1999 (not modified).
IEC 62005 NOTE: Harmonized as EN 62005 series.
__________
- 3 - EN 60875-1:2001
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or 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 European Standard only when incorporated in it by
amendment or revision. For undated references the latest edition of the publication referred to
applies (including amendments).
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
IEC QC 001001 1998 Basic rules of the IEC Quality Assessment--
System for Electronic Components (IECQ)
IEC QC 001002 Series IEC Quality Assessment System for --
Electronic Components (IECQ) - Rules of
Procedure
IEC 60027 Series Letter symbols to be used in electrical--
technology
IEC 60050-731 1991 International Electrotechnical Vocabulary--
(IEV)
Chapter 731: Optical fibre communication
IEC 60410 1973 Sampling plans and procedures for --
inspection by attributes
IEC 60617-12 1997 Graphical symbols for diagrams EN 60617-12 1998
Part 12: Binary logic elements
IEC 60695-2-2 1991 Fire hazard testing EN 60695-2-2 1994
Part 2: Test methods
Section 2: Needle-flame test
IEC 60825 Series Safety of laser products EN 60825 Series

NORME
CEI
INTERNATIONALE IEC
60875-1
INTERNATIONAL
QC 810000
STANDARD
Quatrième édition
Fourth edition
2000-11
Dispositifs de couplage pour fibres optiques
ne dépendant pas de la longueur d'onde –
Partie 1:
Spécification générique
Non-wavelength-selective fibre optic
branching devices –
Part 1:
Generic specification
© IEC 2000 Droits de reproduction réservés ⎯ Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque forme que ce soit et par aucun procédé, any form or by any means, electronic or mechanical,
électronique ou mécanique, y compris la photocopie et les including photocopying and microfilm, without permission in
microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http://www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
V
PRICE CODE
International Electrotechnical Commission
Pour prix, voir catalogue en vigueur
For price, see current catalogue

60875-1 © IEC:2000 – 3 –
CONTENTS
Page
FOREWORD . 7
INTRODUCTION . 11
Clause
1 General. 13
1.1 Scope . 13
1.2 Normative references. 13
1.3 Definitions. 15
2 Requirements. 23
2.1 Classification . 23
2.1.1 Type . 23
2.1.2 Style . 23
2.1.3 Variant . 25
2.1.4 Environmental category . 25
2.1.5 Assessment level . 27
2.1.6 Normative reference extensions . 29
2.2 Documentation. 31
2.2.1 Symbols . 31
2.2.2 Specification system. 31
2.2.3 Drawings. 33
2.2.4 Tests and measurements . 35
2.2.5 Test data sheets . 35
2.2.6 Instructions for use. 37
2.3 Standardization system . 37
2.3.1 Interface standards . 37
2.3.2 Performance standards . 37
2.3.3 Reliability standards . 39
2.3.4 Interlinking . 41
2.4 Design and construction. 43
2.4.1 Materials . 43
2.4.2 Workmanship. 43
2.5 Quality . 43
2.6 Performance . 43
2.7 Identification and marking . 45
2.7.1 Variant identification number . 45
2.7.2 Component marking . 45
2.7.3 Package marking . 45
2.8 Packaging. 47
2.9 Storage conditions . 47
2.10 Safety . 47
3 Quality assessment procedures. 47
3.1 Primary stage of manufacture. 47
3.2 Structurally similar components. 47

60875-1 © IEC:2000 – 5 –
Clause Page
3.3 Qualification approval procedures . 49
3.3.1 Fixed sample procedure . 49
3.3.2 Lot-by-lot and periodic procedure . 49
3.3.3 Qualifying specimen . 49
3.3.4 Sample size . 51
3.3.5 Preparation of specimens . 51
3.3.6 Qualification testing. 51
3.3.7 Qualification failures. 51
3.3.8 Maintenance of qualification approval . 51
3.3.9 Qualification report. 53
3.4 Quality conformance inspection. 53
3.4.1 Lot-by-lot inspection . 53
3.4.2 Periodic inspection . 53
3.5 Certified records of released lots. 55
3.6 Delayed deliveries. 57
3.7 Delivery release before completion of group B tests. 57
3.8 Alternative test methods. 57
3.9 Unchecked parameters . 57
Annex A (informative) Examples of fibre optic branching device types . 59
Bibliography . . 67

60875-1 © IEC:2000 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
__________
NON-WAVELENGTH-SELECTIVE FIBRE OPTIC
BRANCHING DEVICES –
Part 1: Generic specification
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization
for Standardization (ISO) in accordance with conditions determined by agreement between the two
organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60875-1 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
This fourth edition cancels and replaces the third edition, published in 1996, and constitutes a
technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
86B/1361/FDIS 86B/1401/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 3.
The QC number that appears on the front cover of this publication is the specification number
in the IEC Quality Assessment System for Electronic Components (IECQ).

60875-1 © IEC:2000 – 9 –
Annex A is for information only.
The committee has decided that the contents of this publication will remain unchanged
until 2008. At this date, the publication will be
 reconfirmed;
 withdrawn;
 replaced by a revised edition, or
 amended.
60875-1 © IEC:2000 – 11 –
INTRODUCTION
This part of IEC 60875 is divided into three clauses:
1 General
2 Requirements
3 Quality assessment procedures
The first clause contains general information pertaining to this generic specification.
The second clause contains all the requirements to be met by branching devices covered by
this standard. These include classification, IEC specification system, documentation, materials,
workmanship, quality, performance, identification, and packaging.
The third clause contains those procedures which need to be followed for proper quality
assessment of products as covered by this standard.
NOTE Test and measurement procedures are described in IEC 61300-1, IEC 61300-2 and IEC 61300-3.

60875-1 © IEC:2000 – 13 –
NON-WAVELENGTH-SELECTIVE FIBRE OPTIC
BRANCHING DEVICES –
Part 1: Generic specification
1 General
1.1 Scope
This part of IEC 60875 applies to non-wavelength-selective fibre optic branching devices, all
exhibiting the following features:
– they are passive, in that they contain no optoelectronic or other transducing elements;
– they have three or more ports for the entry and/or exit of optical power, and share optical
power among these ports in a predetermined fashion;
– the ports are optical fibres, or optical fibre connectors.
This standard establishes uniform requirements for the following:
– branching devices requirements;
– quality assessment procedures.
1.2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this part of IEC 60875. For dated references, subsequent amendments
to, or revisions of, any of these publications do not apply. However, parties to agreements
based on this part of IEC 60875 are encouraged to investigate the possibility of applying the
most recent editions of the normative documents indicated below. For undated references, the
latest edition of the normative document referred to applies. Members of IEC and ISO maintain
registers of currently valid International Standards.
IEC QC 001001:1998, IEC Quality Assessment System for Electronic Components (IECQ) –
Basic Rules
IEC QC 001002 (all parts), IEC Quality Assessment System for Electronic Components (IECQ) –
Rules of Procedure
IEC 60027 (all parts), Letter symbols to be used in electrical technology
IEC 60050(731):1991, International Electrotechnical Vocabulary (IEV) – Chapter 731: Optical
fibre communication
IEC 60410:1973, Sampling plans and procedures for inspection by attributes
IEC 60617 (all parts), Graphical symbols for diagrams
IEC 60695-2-2:1991, Fire hazard testing – Part 2: Test methods – Section 2: Needle-flame test
IEC 60825 (all parts), Safety of laser products

60875-1 © IEC:2000 – 15 –
IEC 60875-1-1:1996, Fibre optic branching devices – Part 1-1: Blank detail specification
IEC 61300-1, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 1: General and guidance
IEC 61300-2 (all parts), Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures – Part 2: Tests
IEC 61300-3 (all parts), Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures – Part 3: Examinations and measurements
1)
IEC 61748: Manufacturing line approval (QML) for MCM
IEC Guide 102:1996, Electronic components – Specification structures for quality assessment
(Qualification approval and capability approval)
ISO 129:1985, Technical drawings – Dimensioning – General principles, definitions, methods of
execution and special indications
ISO 286-1:1988, ISO system of limits and fits – Part 1: Bases of tolerances, deviations and fits
ISO 370:1975, Toleranced dimensions – Conversion from inches into millimetres and vice
versa
ISO/DIS 1101, Geometrical Product Specifications (GPS) – Geometrical tolerancing –
1)
Generalities, definitions, symbols, indication on drawings
ISO 8601:1988, Data elements and interchange formats – Information interchange –
Representation of dates and times
1.3 Definitions
For the purpose of this part of IEC 60875, the definitions given in IEC 60050(731) apply,
together with the following definitions:
1.3.1
port
optical or optical connector attached to a passive component for the entry (input port) and/or
exit (output port) of the optical power
1.3.2
branching device
non-wavelength-selective
passive component possessing three or more ports which operates over a specified range of
wavelengths and shares the optical power coming into an input port among its output ports in a
predetermined fashion, without any amplification, switching, or other active modulation
1.3.3
optic pigtail
short length of jumper or cable forming an optical port for an optic component
________
1)
To be published.
60875-1 © IEC:2000 – 17 –
1.3.4
splitter
term frequently used as a synonym for a non-wavelength-selective branching device
NOTE The term is also used to define a structure for transferring optical power between two fibres or between an
active device and a fibre.
1.3.5
balanced splitter
splitter designed and intended to produce equal optical power at the output ports
1.3.6
unbalanced splitter
splitter designed and intended to produce different optical power at the output ports
1.3.7
transfer matrix
optical properties of a non-wavelength-selective optic branching device can be defined in terms
of an n × n matrix of coefficients, n being the number of ports, with the coefficients
representing the fractional optical power transferred between designated ports
In general, the transfer matrix T is as follows:
t t ⋅ ⋅ ⋅ t
⎡ ⎤
11 12 1n
⎢ ⎥
t
⎢ ⎥
⋅
⎢ ⎥
T =
⎢⋅ t ⎥
ij
⎢ ⎥
⋅
⎢ ⎥
t t
⎢ n1 nn ⎥
⎣ ⎦
where
t is the ratio of the optical power P transferred out of port j with respect to input power P
i
ij ij
into port i, that is:
t = P /P
i
ij ij
The transfer matrix is used to classify the different types of non-wavelength-selective
branching devices which are specified in this generic specification.
In a non-wavelength-selective branching device, the coefficients t may be a function of the
ij
input wavelength, input polarization or modal power distribution. The values of these
parameters are provided in the detail specification, when necessary.
Single-mode, non-wavelength-selective branching devices may operate in a coherent fashion
with respect to multiple inputs. Consequently, the transfer coefficients may be affected by the
relative phase and intensity of simultaneous coherent optical power inputs at two or more ports.
1.3.8
transfer coefficient
element t of the transfer matrix
ij
60875-1 © IEC:2000 – 19 –
1.3.9
logarithmic transfer matrix
in general, the logarithmic transfer matrix is as follows:
a a ⋅ ⋅ ⋅ a
⎡ ⎤
11 12 1n
⎢ ⎥
a
⎢ ⎥
⋅
⎢ ⎥
A =
⎢⋅ a ⎥
ij
⎢ ⎥
⋅
⎢ ⎥
a a
⎢ n1 nn ⎥
⎣ ⎦
where
a is the optical power reduction in decibels out of port j with unit power into port i, that is:
ij
a = –10 log t
ij ij
where t is the transfer matrix coefficient.
ij
1.3.10
attenuation
element, a (where i ≠ j), of the logarithmic transfer matrix; reduction in optical power between
ij
an input and output port of a passive component expressed in decibels and defined as
a = –10 log (P /P )
1 0
where
P is the optical power launched into the input port;
P is the optical power received from the output port.
1.3.11
return loss
element, a (where i = j), of the logarithmic transfer matrix; fraction of input power that is
ij
returned from the input port of a passive component and defined as
RL = –10 log (P /P )
1 0
where
P is the optical power launched into the input port;
P is the optical power received back from the same port.
1.3.12
conducting ports
two ports i and j between which t is nominally greater than zero
ij
1.3.13
isolated ports
two ports i and j between which t is nominally zero, and a is nominally infinite
ij ij
60875-1 © IEC:2000 – 21 –
1.3.14
directivity
near-end crosstalk
value of a between two isolated ports
ij
1.3.15
excess loss
total power lost in a non-wavelength-selective branching device when an optical signal is
launched into port i, defined a
EL 10 log t
= −
i ij
∑
j
where the summation is performed only over those values j for which i and j are conducting
ports. For a non-wavelength-selective branching device with N input ports, there is an array of
N values of excess loss, one for each input port i.
1.3.16
uniformity
logarithmic transfer matrix of a branching device may contain a specified set of coefficients
which are nominally finite and equal. In this case, the range of these coefficients a , expressed
ij
in decibels, is termed the uniformity of the branching device
1.3.17
coupling ratio
for a given input port i, the ratio of light at a given output port k to the total light from all output
ports and defined as
CR = t t
ik ik ij
∑
j
where j represents the operational output ports.
1.3.18
symmetric non-wavelength-selective branching device
device whose transfer matrix is diagonally symmetric, i.e. where for all i and j, t and t are
ij ji
nominally equal
1.3.19
asymmetric non-wavelength-selective branching device
device whose transfer matrix is diagonally asymmetric, i.e. where there exists at least one i and
j for which t and t are nominally unequal
ij ij
1.3.20
operating wavelength
nominal wavelength λ, at which a passive component is designed to operate with the specified
performance
1.3.21
operating wavelength range
bandpass
specified range of wavelengths from λ to λ about a nominal operating wavelength λ ,
i min i max i
within which a passive component is designed to operate with the specified performance
NOTE For a non-wavelength-selective branching device with more than one operating wavelength, the
corresponding wavelength ranges are not necessarily equal.

60875-1 © IEC:2000 – 23 –
2 Requirements
The requirements for non-wavelength-selective branching devices covered by this clause are
intended to aid in classifying a branching device in a detail specification.
2.1 Classification
Non-wavelength-selective branching devices shall be classified as follows:
– type;
–style;
– variant;
– environmental category;
– assessment level;
– normative reference extensions.
2.1.1 Type
Each type is defined in terms of a schematic diagram and a general form of transfer matrix as
shown in the examples given in annex A which include:
– non-wavelength-selective transmissive star;
– non wavelength-selective reflective star;
– non wavelength-selective reflective and transmissive star.
The main characteristics of each type are as follows:
– transmissive or reflective;
– bidirectional or unidirectional;
– tree or star;
– any combination of the above.
2.1.2 Style
Non-wavelength-selective branching devices may be classified into styles based on the fibre
type(s), the connector type(s), cable type(s), housing shape, and the configuration. The
configuration of branching device ports are classified as follows:
Configuration A
Device containing integral fibre optic pigtails, without connectors.
EXAMPLE
IEC  1839/2000
Non-wavelength-selective branching device

60875-1 © IEC:2000 – 25 –
Configuration B
Device containing integral fibre optic pigtails, with a connector on each pigtail.
EXAMPLE
IEC  1840/2000
Non-wavelength-selective branching device
Configuration C
Device containing fibre optic connectors as an integral part of the device housing.
EXAMPLE
IEC  1842/2000
Non-wavelength-selective branching device
Configuration D
Device containing some combination of the interfacing features of the preceding configurations.
EXAMPLE
IEC  1843/2000
Non-wavelength-selective branching device
2.1.3 Variant
The branching device variant identifies those common features which encompass structurally
similar components (see 3.2).
Examples of features which define a variant include, but are not limited to the following:
– orientation of ports;
– means of mounting.
2.1.4 Environmental category
Various environmental categories are given in the blank detail specifications associated with
this standard which define the test sequences needed for quality assurance.

60875-1 © IEC:2000 – 27 –
Detail specification writers may add tests and/or groups of tests to a particular environmental
category.
However, the detail specification writer shall not remove tests nor alter the sequence of an
environmental category standard.
When a detail specification writer adds tests to a specified category, the environmental
category shall be given a plus (+) designation.
EXAMPLE
– Environmental category ii +;
– Environmental category v +.
The blank detail specification for environmental category 99 is available for use where the
category standards are not suitable.
2.1.5 Assessment level
Assessment level defines the inspection levels and the acceptable quality level (AQL) of groups
A and B and the periodicity of inspection of groups C and D. Detail specifications shall specify
one or more assessment levels, each of which shall be designated by a capital letter.
The following are the preferred levels:
Assessment level A
– group A inspection: inspection level II, AQL = 4 %;
– group B inspection: inspection level II, AQL = 4 %;
– group C inspection: 24 month periods;
– group D inspection: 48 month periods.
Assessment level B
– group A inspection: inspection level II, AQL = 1 %;
– group B inspection: inspection level II, AQL = 1 %;
– group C inspection: 18 month periods;
– group D inspection: 36 month periods.
Assessment level C
– group A inspection: inspection level II, AQL = 0,4 %;
– group B inspection: inspection level II, AQL = 0,4 %;
– group C inspection: 12 month periods;
– group D inspection: 24 month periods.
One additional assessment level may be added in the detail specification. When this is done,
the capital letter X shall be used.

60875-1 © IEC:2000 – 29 –
2.1.6 Normative reference extensions
Normative reference extensions are used to identify the integration of independent standards
specifications or other reference documents into blank detail specifications.
Unless otherwise specified, additional requirements imposed by an extension are mandatory.
Usage is primarily intended to merge associated components to form hybrid devices or
integrated functional application requirements that are dependent on technical expertise used
for other than fibre optics.
Published reference documents produced by ITU, consistent with the scope of the relevant IEC
specification series may be used as extension. Published documents produced by other
regional standardization bodies such as TIA, ETSI, JIS, etc., may be referenced in a
bibliography to the generic specification.
Some optical splice configurations require special qualification provisions which shall not be
imposed universally. This accommodates individual component design configurations,
specialized field tooling or specific application processes. In this case, requirements necessary
to assure repeatable performance or adequate safety, and provide additional guidance for
complete product specification. These extensions are mandatory whenever used to prepare,
assemble or install an optical splice either for field application usage or preparation of
qualification test specimens. The relevant specification shall clarify all stipulations. However,
design and style dependent extensions shall not be imposed universally.
In the event of conflicting requirements, precedence, in descending order, shall be generic over
mandatory extension, over blank detail, over detail, over application specific extension.
Examples of optical connector extensions are given as follows:
• Using IEC 61754-4 and IEC 61754-2 to partially define a future IEC 60874 specification for
a duplex type "SC/BFOC/2,5" hybrid connector adapter.
• Using IEC 61754-13 and IEC 60869-1-1 to partially define a future IEC 60874 specification
for an integrated type "FC" preset attenuated optical connector.
• Using IEC 61754-2 and IEC 61073-4 to partially define a future IEC 60874 specification for
a duplex "BFOC/2,5" receptacle incorporating integral mechanical splices.
Other examples of requirements for normative extensions are as follows:
a) Some commercial or residential building applications may require direct reference to
specific safety codes and regulations or incorporate other specific material flammability or
toxicity requirements for specialized locations.
b) Specialized field tooling may require an extension to implement specific ocular safety,
electrical shock, burn hazard avoidance requirements, or require isolation procedures to
prevent potential ignition of combustible gases.

60875-1 © IEC:2000 – 31 –
2.2 Documentation
2.2.1 Symbols
Graphical and letter symbols shall, whenever possible, be taken from IEC 60027, IEC 60617
IEC 61748.
and
2.2.2 Specification system
This specification is part of a three-level IEC specification system. Subsidiary specifications
shall consist of blank detail specifications and detail specifications. This system is shown in
table 1. There are no sectional specifications for non-wavelength-selective branching devices.
Table 1 – Three-level IEC specification structure
Specification level Examples of information to be included Applicable to
Assessment system rules
Inspection rules
Optical measuring methods
Environmental test methods
Sampling plans
Identification rule
Two or more component
Basic
families or sub-families
Marking standards
Dimensional standards
Terminology standards
Symbol standards
Preferred number series
SI units
Specific terminology
Specific symbols
Specific units
Preferred values
Generic Component family
Marking
Quality assessment procedures
Selection of tests
Qualification approval and/or
capability approval procedures
Quality conformance test schedule
Groups of types having a
Blank detail Inspection requirements
common test schedule
Information common to a number of types
Individual values
Detail Specific information Individual type
Completed quality conformance test schedules

60875-1 © IEC:2000 – 33 –
2.2.2.1 Blank detail specifications
The blank detail specification is contained in IEC 60875-1-1.
This lists all of the parameters and features applicable to a branching device, including the
type, operating characteristics, housing configurations, test methods, and performance
requirements. The blank detail specification is applicable to any branching device design and
quality assessment requirement. The blank detail specification contains the preferred format
for stating the required information in the detail specification.
Blank detail specifications are not, by themselves, a specification level. They are associated
with the generic specification.
Each blank detail specification shall be limited to one environmental category.
Each blank detail specification shall contain:
– the minimum mandatory test schedules and performance requirements;
– one or more assessment levels;
– the preferred format for stating the required information in the detail specification;
– in case of hybrid components, including connectors, addition of appropriate entry fields to
show the reference normative document, document title and issue date.
2.2.2.2 Detail specifications
A specific non-wavelength-selective branching device is described by a corresponding detail
specification, which is prepared by filling in the blanks of the blank detail specification. Within
the constraints imposed by this generic specification, the blank detail specification may be filled
in by any national committee of the IEC, thereby defining a particular non-wavelength-selective
branching device design as an IEC standard.
Detail specifications shall specify the following, as applicable:
– type (see 2.1.1);
– style (see 2.1.2);
– variant(s) (see 2.1.3);
– environmental category (see 2.1.4);
– assessment level (see 2.1.5);
– qualification approval procedures (see 3.3);
– part identification number for each variant (see 2.7.1);
– drawings, dimensions required (see 2.2.3);
– quality assessment test schedules (see 2.1.5);
– performance requirements (see 2.6).
2.2.3 Drawings
The drawings and dimensions given in detail specifications shall not restrict themselves to
details of construction, nor shall they be used as manufacturing drawings.

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2.2.3.1 Projection system
Either first angle or third angle projection shall be used for the drawings in documents covered
by this specification. All drawings within a document shall use the same projection system and
the drawings shall state which system is used.
2.2.3.2 Dimensional system
All dimensions shall be given in accordance with ISO 129, ISO 286-1 and ISO/DIS 1101.
The metric system shall be used in all specifications.
Dimensions shall not contain more than five significant digits.
Conversion between systems of units shall be according to ISO 370. When units are converted,
a note shall be added in each detail specification.
2.2.4
Tests and measurements
2.2.4.1 Test and measurement procedures
The test and measurement procedures for optical, mechanical, climatic, and environmental
characteristics of branching devices to be used shall be defined and selected preferentially
from the IEC 61300 series.
The size measurement method to be used shall be specified in the detail specification for any
dimensions which are specified within a total tolerance zone of 0,01 mm or less.
2.2.4.2 Reference components
Reference components for measurement purposes, if required, shall be specified in the
relevant specification.
2.2.4.3 Gauges
Gauges, if required, shall be specified in the relevant specification.
2.2.5 Test data sheets
Test data sheets shall be prepared for each test conducted as required by a relevant
specification. The data sheets shall be included in the qualification report (see 3.3.9) and in the
periodic inspection report (see 3.4.2.6).
Data sheets shall contain the following information as a minimum:
– title of test and date;
– specimen description including the type of fibre and the variant identification number
(see 2.7.1);
– test equipment used and date of latest calibration;
– all applicable test details;
– all measurement values and observations;
– sufficiently detailed documentation to provide traceable information for failure analysis
(see 3.3.7 and 3.4.2.5).
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2.2.6 Instructions for use
Instructions for use, when required, shall be given by the manufacturer and shall include:
–
assembly and connection instructions;
– cleaning method;
– safety aspects;
– additional information, as necessary.
2.3 Standardization system
2.3.1 Interface standards
The interface standards provide both manufacturer and user with all the information they
require to make or use a product conforming to the physical features of that standard interface.
Interface standards fully define and provide dimensions for the features essential for the
mating and unmating of optical connectors and other components. They also serve to position
the optical datum target, where defined, relative to other reference datum.
Interface standards ensure that connectors and adaptors that comply with the standard will fit
together. The standards may also contain tolerance grades for ferrules and alignment devices.
Tolerance grades are used to provide different levels of alignment precision.
The interface dimensions may also be used to design other components that will mate with the
connectors. For example, an active device mount can be designed using the adapter interface
dimensions. The use of these dimensions combined with those of a standard plug, provides the
designer with assurance that the standard plugs will fit into the optical device mount. They also
provide the location of the plug's optical datum target.
Standard interface dimensions do not, by themselves, guarantee optical performance. They
guarantee connector mating at a specified fit. Optical performance is currently guaranteed via
the manufacturing specification. Products from the same or different manufacturing
specifications using the same standard interface will always fit together. Guaranteed
performance can be given by any single manufacturer only for products delivered to the same
manufacturing specification. However, it can be reasonably expected that some level of
performance will be obtained from products having different manufacturing specifications,
although the level of performance cannot be expected to be any better than that of the lowest
specified performance.
2.3.2 Performance standards
Performance standards contain a series of tests and measurements (which may or may not be
grouped into a specified schedule depending on the requirements of that standard) with clearly
defined conditions, severities and pass/fail criteria. The tests are intended to be run on a
"once-off" basis to prove any product's ability to satisfy the "performance standards"
requirements of a market sector, user group or system location. A product that has been shown
to meet all the requirements of a performance standard can be declared as complying with a
performance standard, but should then be controlled by a quality assurance/quality
conformance programme.
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A key point of the test and measurement standards for their application (particularly with regard
to attenuation and return loss) in conjunction with the interface standards of interproduct
compatibility can be defined. Conformity of each individual product to this standard will be
ensured.
2.3.3 Reliability standards
Reliability standards are intended to ensure that a component can meet performance
specifications under stated conditions for a stated time period.
For each type of component, the following shall be identified (and shall appear in the standard):
– failure modes (observable, general mechanical or optical effects of failure);
– failure mechanisms (general causes of failure common to several components);
– failure effects (detailed cause of failure, specific to component).
These are all related to environmental and material aspects.
Initially, just after component manufacture, there is an "infant mortality phase" during which
many components would fail if deployed in the field. To avoid early field failure, all components
can be subjected to a screening process in the factory, involving environmental stress that may
be mechanical, thermal or humidity related. This is to induce known failure mechanisms in a
controlled environmental situation to occur earlier than would normally be seen in an
unscreened population. For those compone
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