Fibre optic interconnecting devices and passive components - Fibre optic spatial switches - Part 1: Generic specification (IEC 60876-1:2014)

This part of IEC 60876 applies to fibre optic switches possessing all of the following general
features:
– they are passive in that they contain no optoelectronic or other transducing elements;
– they have one or more ports for the transmission of optical power and two or more states
in which power may be routed or blocked between these ports;
– the ports are optical fibres or fibre optic connectors.

Lichtwellenleiter - Verbindungselemente und passive Bauteile - Räumliche Umschalter für Lichtwellenleiter Teil 1: Fachgrundspezifikation (IEC 60876-1:2014)

Dispositifs d'interconnexion et composants passifs à fibres optiques - Commutateurs spatiaux à fibres optiques Partie 1: Spécification générique (CEI 60876-1:2014)

L'IEC 60876-1:2014 s'applique aux commutateurs à fibres optiques possédant toutes les caractéristiques générales suivantes: - ils sont passifs dans la mesure où ils ne contiennent aucun élément optoélectronique ou autre élément transducteur; - ils ont au moins un port de transmission de la puissance optique et au moins deux états dans lesquels la puissance peut passer ou être bloquée entre ces ports; - les ports sont des fibres optiques ou des connecteurs à fibres optiques. Cette cinquième édition annule et remplace la quatrième édition parue en 2012. Elle constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: - l'ajout de définitions pour les termes "conducteur par défaut", "isolé par défaut" et "diaphonie"; - l'ajout d'une nouvelle Annexe E. Mots clés: commutateurs à fibres optiques, transmission de la puissance optique, connecteurs à fibres optiques

Optični spojni elementi in pasivne komponente - Optična prostorska stikala - 1. del: Rodovna specifikacija (IEC 60876-1:2014)

Ta del standarda IEC 60876 velja za optična stikala, ki imajo vse naštete splošne lastnosti:
– so pasivna in ne vsebujejo nobenih optoelektronskih ali drugih prevodnih elementov;
– imajo vsaj ena vrata za prenos optične moči in vsaj dve stanji, pri katerih se lahko moč usmeri ali blokira med temi vrati;
– vrata so optična vlakna ali optični konektorji.

General Information

Status
Published
Publication Date
26-Feb-2015
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
09-Jan-2015
Due Date
16-Mar-2015
Completion Date
27-Feb-2015

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SLOVENSKI STANDARD
SIST EN 60876-1:2015
01-april-2015
1DGRPHãþD
SIST EN 60876-1:2012
2SWLþQLVSRMQLHOHPHQWLLQSDVLYQHNRPSRQHQWH2SWLþQDSURVWRUVNDVWLNDOD
GHO5RGRYQDVSHFLILNDFLMD ,(&
Fibre optic interconnecting devices and passive components - Fibre optic spatial
switches - Part 1: Generic specification (IEC 60876-1:2014)

Lichtwellenleiter - Verbindungselemente und passive Bauteile - Räumliche Umschalter

für Lichtwellenleiter Teil 1: Fachgrundspezifikation (IEC 60876-1:2014)

Dispositifs d'interconnexion et composants passifs à fibres optiques - Commutateurs

spatiaux à fibres optiques Partie 1: Spécification générique (CEI 60876-1:2014)
Ta slovenski standard je istoveten z: EN 60876-1:2014
ICS:
31.220.20 Stikala Switches
33.180.20 3RYH]RYDOQHQDSUDYH]D Fibre optic interconnecting
RSWLþQDYODNQD devices
SIST EN 60876-1:2015 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 60876-1:2015
---------------------- Page: 2 ----------------------
SIST EN 60876-1:2015
EUROPEAN STANDARD EN 60876-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2014
ICS 33.180.20 Supersedes EN 60876-1:2012
English Version
Fibre optic interconnecting devices and passive components -
Fibre optic spatial switches - Part 1: Generic specification
(IEC 60876-1:2014)

Dispositifs d'interconnexion et composants passifs à fibres Lichtwellenleiter - Verbindungselemente und passive

optiques - Commutateurs spatiaux à fibres optiques Bauteile - Räumliche Umschalter für Lichtwellenleiter

Partie 1: Spécification générique Teil 1: Fachgrundspezifikation
(CEI 60876-1:2014) (IEC 60876-1:2014)

This European Standard was approved by CENELEC on 2014-09-26. 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 CEN-CENELEC

Management Centre 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 CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 60876-1:2014 E
---------------------- Page: 3 ----------------------
SIST EN 60876-1:2015
EN 60876-1:2014 - 2 -
Foreword

The text of document 86B/3713/CDV, future edition 5 of IEC 60876-1, 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 approved by CENELEC as EN 60876-1:2014.
The following dates are fixed:
(dop) 2015-06-26
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2017-09-26
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60876-1:2012

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such

patent rights.
Endorsement notice

The text of the International Standard IEC 60876-1:2014 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 60410 NOTE Harmonised as EN 60410
IEC 60869-1 NOTE Harmonised as EN 60869-1
IEC 61073-1 NOTE Harmonised as EN 61073-1
---------------------- Page: 4 ----------------------
SIST EN 60876-1:2015
- 3 - EN 60876-1:2014
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60027 Series Letter symbols to be used in electrical EN 60027 Series
technology
IEC 60050-731 - International Electrotechnical Vocabulary - -
(IEV)
Chapter 731: Optical fibre communication
IEC 60617 Series Standard data element types with - Series
associated classification scheme for
electric components
IEC 60695-11-5 - Fire hazard testing EN 60695-11-5 -
Part 11-5: Test flames - Needle-flame test
method - Apparatus, confirmatory test
arrangement and guidance
IEC 60825-1 - Safety of laser products EN 60825-1 -
Part 1: Equipment classification and
requirements
IEC 61300 Series Fibre optic interconnecting devices and EN 61300 Series
passive components - Basic test and
measurement procedures
IEC/TR 61930 - Fibre optic graphical symbology - -
IEC 62047-1 - Semiconductor devices - Micro- EN 62047-1 -
electromechanical devices
Part 1: Terms and definitions
ISO 129-1 - Technical drawings - Indication of - -
dimensions and tolerances
Part 1: General principles
ISO 286-1 - Geometrical product specifications (GPS) - EN ISO 286-1 -
ISO code system for tolerances on linear
sizes
Part 1: Basis of tolerances, deviations and
fits
ISO 1101 - Geometrical product specifications (GPS) - EN ISO 1101 -
Geometrical tolerancing - Tolerances of
form, orientation, location and run-out
ISO 8601 - Data elements and interchange formats - - -
Information interchange - Representation
of dates and times
---------------------- Page: 5 ----------------------
SIST EN 60876-1:2015
---------------------- Page: 6 ----------------------
SIST EN 60876-1:2015
IEC 60876-1
Edition 5.0 2014-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic interconnecting devices and passive components –
Fibre optic spatial switches –
Part 1: Generic specification
Dispositifs d'interconnexion et composants passifs à fibres optiques –
Commutateurs spatiaux à fibres optiques –
Partie 1: Spécification générique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 33.180.20 ISBN 978-2-8322-1791-7

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN 60876-1:2015
– 2 – IEC 60876-1:2014 © IEC 2014
CONTENTS

FOREWORD ......................................................................................................................... 4

1 Scope ............................................................................................................................ 6

2 Normative references..................................................................................................... 6

3 Terms and definitions .................................................................................................... 7

3.1 Basic terms and definitions .................................................................................... 7

3.2 Component definitions ........................................................................................... 8

3.3 Performance parameter definitions ........................................................................ 9

4 Requirements .............................................................................................................. 12

4.1 Classification ...................................................................................................... 12

4.1.1 General ....................................................................................................... 12

4.1.2 Type ............................................................................................................ 13

4.1.3 Style ............................................................................................................ 16

4.1.4 Variant ......................................................................................................... 17

4.1.5 Normative reference extension ..................................................................... 17

4.2 Documentation .................................................................................................... 18

4.2.1 Symbols ....................................................................................................... 18

4.2.2 Specification system .................................................................................... 18

4.2.3 Drawings ..................................................................................................... 20

4.2.4 Test and measurement ................................................................................. 20

4.2.5 Test reports ................................................................................................. 21

4.2.6 Instructions for use ...................................................................................... 21

4.3 Standardization system ....................................................................................... 21

4.3.1 Interface standards ...................................................................................... 21

4.3.2 Performance standards ................................................................................ 21

4.3.3 Reliability standards ..................................................................................... 22

4.3.4 Interlinking ................................................................................................... 22

4.4 Design and construction ...................................................................................... 24

4.4.1 Materials ...................................................................................................... 24

4.4.2 Workmanship ............................................................................................... 24

4.5 Quality ................................................................................................................ 24

4.6 Performance ....................................................................................................... 24

4.7 Identification and marking.................................................................................... 24

4.7.1 General ....................................................................................................... 24

4.7.2 Variant identification number ........................................................................ 24

4.7.3 Component marking ..................................................................................... 25

4.7.4 Package marking ......................................................................................... 25

4.8 Packaging ........................................................................................................... 25

4.9 Storage conditions .............................................................................................. 25

4.10 Safety ................................................................................................................. 25

Annex A (informative) Example of magneto-optic effect (MO) switch technologies ............... 27

Annex B (informative) Example of mechanical switch technologies ...................................... 28

Annex C (informative) Example of micro-electromechanical system (MEMS) switch

technologies ....................................................................................................................... 29

Annex D (informative) Example of thermo-optic effect (TO) technologies ............................. 30

Annex E (informative) Summary of definitions on switching time ......................................... 33

Bibliography ....................................................................................................................... 34

---------------------- Page: 8 ----------------------
SIST EN 60876-1:2015
IEC 60876-1:2014 © IEC 2014 – 3 –
Figure 1 – Representation of latency time, rise time, fall time, bounce time and

switching time .............................................................................................................. 12

Figure 2 – Single-pole, single-throw switch .......................................................................... 14

Figure 3 – Transfer matrix for one input port and one output port ......................................... 14

Figure 4 – Single-pole, throw switch .................................................................................... 14

Figure 5 – Transfer matrix for one input port and N output ports ........................................... 14

Figure 6 – N-port matrix switch............................................................................................ 15

Figure 7 – Transfer matrix for N-ports switch ....................................................................... 15

Figure 8 – Four-port switch without crossover ...................................................................... 16

Figure 9 – Four-port switch with crossover .......................................................................... 16

Figure 10 – Configuration A, a device containing integral fibre optic pigtails without

connectors .......................................................................................................................... 17

Figure 11 – Configuration B, a device containing integral fibre optic pigtails, with a

connector on each pigtail .................................................................................................... 17

Figure 12 – Configuration C, a device containing a fibre optic connector as an integral

part of the device housing ................................................................................................... 17

Figure 13 – Standards ........................................................................................................ 23

Figure A.1 – Example of 1×2 MO switch .............................................................................. 27

Figure B.1 – Example of mechanical switch (mirror driving type) .......................................... 28

Figure B.2 – Example of mechanical switch (fibre driving type) ............................................ 28

Figure C.1 – Example of MEMS switch ................................................................................ 29

Figure D.1 – Example of TO switch ..................................................................................... 30

Figure D.2 – Output power of TO switch .............................................................................. 31

Figure D.3 – Example of switching response of TO switch ................................................... 31

Figure D.4 – 1 × N and N × N examples of TO switch ........................................................... 32

Table 1 – Example of a typical switch classification ............................................................. 13

Table 2 – Transfer matrix of a four-port switch without crossover ......................................... 15

Table 3 – Transfer matrix of a four-port switch with crossover .............................................. 16

Table 4 – IEC specification structure ................................................................................... 19

Table 5 – Standards interlink matrix .................................................................................... 24

Table E.1 – Summary of definitions of latency time .............................................................. 33

Table E.2 – Summary of the definitions of rise time ............................................................. 33

Table E.3 – Summary of the definitions of fall time .............................................................. 33

---------------------- Page: 9 ----------------------
SIST EN 60876-1:2015
– 4 – IEC 60876-1:2014 © IEC 2014
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
FIBRE OPTIC SPATIAL SWITCHES –
Part 1: Generic specification
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of 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, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). 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. 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 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 IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60876-1 has been prepared by subcommittee SC86B: Fibre optic

interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.

This fifth edition cancels and replaces the fourth edition that was published in 2012 and

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:

a) addition of definitions for the terms for "normally-on; "normally-off" and "crosstalk";

b) addition of a new Annex E.
---------------------- Page: 10 ----------------------
SIST EN 60876-1:2015
IEC 60876-1:2014 © IEC 2014 – 5 –
The text of this standard is based on the following documents:
CDV Report on voting
86B/3713/CDV 86B/3788/RVC

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 2.

A list of all the parts in the IEC 60876 series, published under the general title Fibre optic

interconnecting devices and passive components – Fibre optic spatial switches can be found

on the IEC website.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
---------------------- Page: 11 ----------------------
SIST EN 60876-1:2015
– 6 – IEC 60876-1:2014 © IEC 2014
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
IBRE OPTIC SPATIAL SWITCHES –
Part 1: Generic specification
1 Scope

This part of IEC 60876 applies to fibre optic switches possessing all of the following general

features:

– they are passive in that they contain no optoelectronic or other transducing elements;

– they have one or more ports for the transmission of optical power and two or more states

in which power may be routed or blocked between these ports;
– the ports are optical fibres or fibre optic connectors.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60027 (all parts), Letter symbols to be used in electrical technology

IEC 60050-731, International Electrotechnical Vocabulary – Chapter 731: Optical fibre

communication
IEC 60617 (all parts), Graphical symbols for diagrams (available at
)

IEC 60695-11-5, Fire hazard testing – Part 11-5: Test flames – Needle-flame test method –

Apparatus, confirmatory test arrangement and guidance

IEC 60825-1, Safety of laser products – Part 1: Equipment classification and requirements

IEC 61300 (all parts), Fibre optic interconnecting devices and passive components – Basic

test and measurement procedures
IEC TR 61930, Fibre optic graphical symbology

IEC 62047-1, Semiconductor devices – Micro-electromechanical devices – Part 1: Terms and

definitions

ISO 129-1, Technical drawings – Indication of dimensions and tolerances – Part 1: General

principles

ISO 286-1, Geometrical product specifications (GPS) – ISO code system for tolerances on

linear sizes – Part 1: Basis of tolerances, deviations and fits
---------------------- Page: 12 ----------------------
SIST EN 60876-1:2015
IEC 60876-1:2014 © IEC 2014 – 7 –

ISO 1101, Geometrical product specifications (GPS) – Geometrical tolerancing – Tolerances

of form, orientation, location and run-out
ISO 8601, Data elements and interchange formats – Information interchange –
Representation of dates and times
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60050-731, together

with the following, apply.
3.1 Basic terms and definitions
3.1.1
port

optical fibre or fibre optic connector attached to a passive component for the entry and/or exit

of optical power
3.1.2
transfer matrix

optical properties of a fibre optic switch can be defined in a n × n matrix of coefficients (n is

the number of ports)

Note 1 to entry: The T matrix represents the on-state paths (worst-case transmission) and the T° matrix

represents the off-state paths (worst-case isolation).
3.1.3
transfer coefficient
element t or t° of the transfer matrix
ij ij

Note 1 to entry: Each transfer coefficient t is the worst-case (minimum) fraction of power transferred from port i

to port j for any state with path ij switched on. Each coefficient t° is the worst-case (maximum) fraction of power

transferred from port i to port j for any state with path ij switched off.
3.1.4
logarithmic transfer matrix
a = –10 log t
ij 10 ij
where

a is the optical power reduction in decibels out of port j with unit power into port i, i.e.

t is the transfer coefficient
Note 1 to entry: Similarly, for the off state, a° = –10 log t° .
ij 10 ij
3.1.5
switch state

particular optical configuration of a switch, whereby optical power is transmitted or blocked

between specific ports in a predetermined manner
3.1.6
actuation mechanism

physical means (mechanical, electrical, acoustic, optical, etc.) by which a switch is designed

to change between states
3.1.7
actuation energy
input energy required to place a switch in a specific state
---------------------- Page: 13 ----------------------
SIST EN 60876-1:2015
– 8 – IEC 60876-1:2014 © IEC 2014
3.1.8
blocking

inability to establish a connection from a free input port to a free output port due to the

existence of some other established connection

Note 1 to entry: Blocking and various degrees of non-blocking operation functionalities are of various types:

“Strict-sense non-blocking” refers to a switch matrix in which it is always possible to establish a connection

between any free input port and any free output port, irrespective of previously established connections.

“Wide-sense non-blocking” refers to a matrix in which it is always possible to establish a desired connection

provided that some systematic procedure is followed in setting up connections. Some multistage switching

architectures fall into this category.

“Rearrangeably non-blocking” refers to a switch matrix in which any free input port can be connected to any free

output port provided that other established connections are unconnected and then reconnected as part of making

the new connection.
3.1.9
normally on

condition where a port pair is in a conducting state when there is no actuation energy applied

for a non-latching switch
3.1.10
normally off

condition where a port pair is in an isolated state when there is no actuation energy applied

for a non-latching switch
3.2 Component definitions
3.2.1
optical switch

passive component processing one or more ports which selectively transmits, redirects or

blocks optical power in an optical fibre transmission line
3.2.2
latching switch

switch that maintains its last state and specified performance level when the actuation energy

which initiated the change is removed
3.2.3
non-latching switch

switch that reverts to a home state or undefined state when the actuation energy which

initiated a change is removed
3.2.4
magneto-optic effect switch
MO switch

optical switch which uses the magneto-optic effect (phenomenon of polarization state change

in transmitted light and reflected light due to a magnetic field)

Note 1 to entry: Annex A shows an example of magnet-optic effect swich technologies.

3.2.5
mechanical switch

optical switch which realises the switching function by driving of the movable part

Note 1 to entry: Annex B shows an example of mechanical swich technologies.
---------------------- Page: 14 ----------------------
SIST EN 60876-1:2015
IEC 60876-1:2014 © IEC 2014 – 9 –
3.2.6
micro-electromechanical system switch
MEMS switch
optical switch using MEMS technology, as defined in IEC 62047-1

Note 1 to entry: Annex C shows example of micro-mechanical system swich technologies.

3.2.7
thermo-optic effect switch
TO switch
optical switch
...

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