Bsi bs en 62148 15 2014

BS EN 62148-15:2014 BSI Standards Publication Fibre optic active components and devices — Package and interface standards Part 15: Discrete vertical cavity surface emitting laser packages BRITISH STANDARD BS EN 62148-15:2014 National foreword This British Standard is the UK implementation of EN 62148-15:2014 It is identical to IEC 62148-15:2014 It supersedes BS EN 62148-15:2010 which is withdrawn The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/3, Fibre optic systems and active devices A list of organizations represented on this committee can be obtained on request to its secretary This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application © The British Standards Institution 2014 Published by BSI Standards Limited 2014 ISBN 978 580 81907 ICS 33.180.20 Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2014 Amendments/corrigenda issued since publication Date Text affected BS EN 62148-15:2014 EUROPEAN STANDARD EN 62148-15 NORME EUROPÉENNE EUROPÄISCHE NORM August 2014 ICS 33.180.20 Supersedes EN 62148-15:2010 English Version Fibre optic active components and devices - Package and interface standards - Part 15: Discrete vertical cavity surface emitting laser packages (IEC 62148-15:2014) Composants et dispositifs actifs fibres optiques - Normes de btier et d'interface - Partie 15: Btiers individuels pour laser cavité verticale émettant par la surface (CEI 62148-15:2014) Aktive Lichtwellenleiterbauelemente und -geräte - Gehäuseund Schnittstellennormen - Teil 15: Einzelgehäuse für oberflächenemittierende Laser mit vertikalem Resonator (IEC 62148-15:2014) This European Standard was approved by CENELEC on 2014-06-27 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 62148-15:2014 E BS EN 62148-15:2014 EN 62148-15:2014 -2- Foreword The text of document 86C/1131/CDV, future edition of IEC 62148-15, prepared by SC 86C "Fibre optic systems and active devices” of IEC/TC 86 “Fibre optics" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 62148-15:2014 The following dates are fixed: • latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2015-03-27 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2017-06-27 This document supersedes EN 62148-15:2010 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 62148-15:2014 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 60130 NOTE Harmonized in EN 60130 Series IEC 60191 NOTE Harmonized in EN 60191 Series IEC 60603 NOTE Harmonized in EN 60603 Series IEC 60794 NOTE Harmonized in EN 60794 Series IEC 60825 NOTE Harmonized in EN 60825 Series IEC 61076 NOTE Harmonized in EN 61076 Series IEC 61280 NOTE Harmonized in EN 61280 Series IEC 61281-1 NOTE Harmonized as EN 61281-1 IEC 61754 NOTE Harmonized in EN 61754 Series IEC 62007-1 NOTE Harmonized as EN 62007-1 IEC 62007-2 NOTE Harmonized as EN 62007-2 IEC 62149-2 NOTE Harmonized as EN 62149-2 ISO 1101 NOTE Harmonized as EN ISO 1101 -3- BS EN 62148-15:2014 EN 62148-15:2014 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 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies NOTE Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu Publication IEC 60793-2 IEC 60874 IEC 61754-4-1 IEC 61754-20 IEC 62148-1 ITU-T Recommendation G.652 Year Title EN/HD Series Optical fibres EN 60793-2 Part 2: Product specifications - General Series Fibre optic interconnecting devices and EN 60874 passive components - Connectors for optical fibres and cables Fibre optic connector interfaces EN 61754-4-1 Part 4-1: Type SC connector family Simplified receptacle SC-PC connector interfaces Fibre optic interconnecting devices and EN 61754-20 passive components - Fibre optic connector interfaces Part 20: Type LC connector family Fibre optic active components and devices -EN 62148-1 Package and interface standards Part 1: General and guidance Characteristics of a single-mode optical fibre and cable Year Series Series - - - –2– BS EN 62148-15:2014 IEC 62148-15:2014 © IEC 2014 CONTENTS INTRODUCTION Scope Normative references Terms, definitions and abbreviations 3.1 Terms and definitions 3.2 Abbreviations Classification Specification of the optical interface 5.1 General 5.2 Optical connector interface (type 1) 5.3 Pigtail interface (type 3) Specifications of electrical interfaces 6.1 General 6.2 Electrical interface specifications for VCSEL TO CAN packages 10 6.2.1 General 10 6.2.2 Numbering of electrical terminals 10 6.2.3 Electrical terminal assignment 10 6.3 Electrical interface specifications for VCSEL TOSA package with a LC connector 10 6.3.1 General 10 6.3.2 Numbering of electrical terminals 11 6.3.3 Electrical terminal assignment 11 6.4 Electrical interface specifications for VCSEL TOSA package with a SC connector 11 6.4.1 General 11 6.4.2 Numbering of electrical terminals 11 6.4.3 Electrical terminal assignment 11 Outline 12 7.1 General 12 7.2 Outline of VCSEL TO CAN packages 12 7.2.1 Drawings of case outline 12 7.2.2 Dimensions of VCSEL TO CAN packages 13 7.3 Outlines of VCSEL TOSA package with an LC connector for use at low speed (below Gbps) 13 7.3.1 Drawings of case outline 13 7.3.2 Dimensions of VCSEL TOSA package with an LC connector for use at a low speed (below Gbps) 14 7.3.3 Optical receptacle LC style 14 7.4 Outlines of VCSEL TOSA package with an SC connector for use at low speed (below Gbps) 14 7.4.1 Drawings of case outline 14 7.4.2 Dimensions of VCSEL TOSA package with an SC connector for use at low speed (below Gbps) 15 7.4.3 Optical receptacle SC style 15 7.5 Outlines of VCSEL TOSA package with an LC connector for use at high speed (≥8 Gbps) 15 BS EN 62148-15:2014 IEC 62148-15:2014 © IEC 2014 –3– 7.5.1 7.5.2 Drawings of case outline 15 Dimensions of VCSEL TOSA package with an LC connector for use at high speed (≥8 Gbps) 16 7.6 Outlines of VCSEL TOSA package with an SC connector for use at high speed (≥8 Gbps) 17 7.6.1 Drawings of case outline 17 7.6.2 Dimensions of VCSEL TOSA package with an SC connector for use at high speed (≥ Gbps) 18 7.7 Electrical terminals of high-speed (≥8 Gbps) VCSEL TOSA packages for both cases with LC and SC connectors 19 7.7.1 Pin out terminals 19 7.7.2 Pad terminals 20 7.8 Outlines of VCSEL pigtail package 20 7.8.1 Drawings of case outline 20 7.8.2 Dimensions of VCSEL pigtail package 21 7.8.3 Optical connectors 21 Bibliography 22 Figure – Electrical terminal numbering assignments of 3-pin and 4-pin type TO CAN packages with optional colour code C for pin configuration 10 Figure – Electrical terminal numbering assignments of 3-pin and 4-pin type TOSA packages with LC connector and with optional colour code C 11 Figure – Electrical terminal numbering assignments of 3-pin and 4-pin type TOSA packages with SC connector and with optional colour code C 11 Figure – Schematic diagrams and pin-out of VCSEL TO CANs with flat window, with ball lens, and with tilted window with optional colour code C on the bottom 12 Figure – Schematic diagram of VCSEL TOSA package with LC connector and with optional colour code C on the bottom for use at low speed (below Gbps) 13 Figure – Schematic diagram of VCSEL TOSA package with SC connector and with optional colour code C on the bottom for use at low speed (below Gbps) 15 Figure – Schematic diagram of VCSEL TOSA package with LC connector and with optional colour code C for pin-type notation for use at high speed (>8 Gbps) 16 Figure – Schematic diagram of VCSEL TOSA package with SC connector and with optional colour code C for pin-type notation for use at high speed (≥8 Gbps) 18 Figure – Schematic diagram and pin-out of VCSEL pigtail package with optional colour code C 21 Table – Pin-function definitions of 4-pin type VCSEL TO CAN packages 10 Table – Pin-function definitions of 3-pin type VCSEL TO CAN packages 10 Table – Dimension of VCSEL TO CANs with flat window, ball lens and tilted window 13 Table – Dimensions of VCSEL TOSA package with LC connector for use at low speed (below Gbps) 14 Table – Dimension of VCSEL TOSA package with SC connector for use at low speed (below Gbps) 15 Table – Dimension of VCSEL TOSA package with LC connector for use at high speed (≥8 Gbps) 16 Table – Dimension of VCSEL TOSA package with SC connector for use at high speed (≥8 Gbps) 19 Table – Pin out terminals of VCSEL TOSA package with LC and SC connectors for use at high speed (≥8 Gbps) 20 –4– BS EN 62148-15:2014 IEC 62148-15:2014 © IEC 2014 Table – Pad terminals of VCSEL TOSA package with LC and SC connectors and with flexible printed circuit board for use at high speed (≥8 Gbps) 20 Table 10 – Dimensions of VCSEL pigtail package 21 BS EN 62148-15:2014 IEC 62148-15:2014 © IEC 2014 –7– INTRODUCTION Fibre optic laser devices are used to convert electrical signals into optical signals This standard covers the physical dimension and interface for the discrete vertical cavity surface emitting laser (VCSEL) packages –8– BS EN 62148-15:2014 IEC 62148-15:2014 © IEC 2014 FIBRE OPTIC ACTIVE COMPONENTS AND DEVICES – PACKAGE AND INTERFACE STANDARDS – Part 15: Discrete vertical cavity surface emitting laser packages Scope This part of IEC 62148 covers the physical dimension and interface specifications for the discrete vertical cavity surface emitting laser (VCSEL) devices in optical telecommunication and optical data transmission applications The intent of this standard is to adequately specify the physical requirements of VCSEL devices that will enable mechanical interchangeability of laser devices or transmitters complying with this standard both at the printed circuit wiring board and for any panelmounting requirement 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 60793-2 (all parts), Optical fibres – Part 2: Product specifications IEC 60874 (all parts), Fibre optic interconnecting devices and passive components – Connectors for optical fibres and cables IEC 61754-4-1, Fibre optic connector interfaces – Part 4-1: Type SC connector family – Simplified receptacle SC-PC connector interfaces IEC 61754-20, Fibre optic interconnecting devices and passive components – Fibre optic connector interfaces – Part 20: Type LC connector family IEC 62148-1, Fibre optic active components and devices – Package and interface standards – Part 1: General and guidance ITU-T Recommendation G.652, Characteristics of a single-mode optical fibre and cable Terms, definitions and abbreviations For the purpose of this document, the following terms, definitions and abbreviations apply 3.1 Terms and definitions 3.1.1 pigtail package package type of photonic devices which has a length of fibre attachment for both optical input and output ports 3.2 Abbreviations VCSEL vertical cavity surface emitting laser BS EN 62148-15:2014 IEC 62148-15:2014 © IEC 2014 – 10 – 6.2 Electrical interface specifications for VCSEL TO CAN packages 6.2.1 General The electrical interface in this standard defines only the basic functionality of each pin 6.2.2 Numbering of electrical terminals Pin numbering assignments are shown in Figure 1 C C 2 3 IEC NOTE 1659/14 The electrical terminals as viewed from the bottom of the package module with pins underneath Figure – Electrical terminal numbering assignments of 3-pin and 4-pin type TO CAN packages with optional colour code C for pin configuration 6.2.3 Electrical terminal assignment Table – Pin-function definitions of 4-pin type VCSEL TO CAN packages Pin number Function (VCSEL with a monitor photodiode) Common cathode Common anode Float (type K) Float (type A) VCSEL anode VCSEL cathode VCSEL anode VCSEL cathode VCSEL cathode/PD anode VCSEL anode/PD cathode VCSEL cathode VCSEL anode PD cathode PD anode PD cathode PD cathode Ground/case (option) Ground/case (option) PD anode/case PD anode/case Optional colour code (C) Blue Red Green Black Table – Pin-function definitions of 3-pin type VCSEL TO CAN packages Pin number Function (VCSEL with a monitor photodiode) Common anode Common cathode VCSEL cathode VCSEL anode VCSEL anode/PD cathode VCSEL cathode/PD anode PD anode PD cathode Optional colour code (C) Red Blue 6.3 6.3.1 Electrical interface specifications for VCSEL TOSA package with a LC connector General The electrical interface in this standard defines only the basic functionality of each pin BS EN 62148-15:2014 IEC 62148-15:2014 © IEC 2014 6.3.2 – 11 – Numbering of electrical terminals Pin numbering assignments are shown in Figure 2 C C IEC NOTE 1660/14 The electrical terminals as viewed from the bottom of the package module with pins underneath Figure – Electrical terminal numbering assignments of 3-pin and 4-pin type TOSA packages with LC connector and with optional colour code C 6.3.3 Electrical terminal assignment The pin-function definitions of the 3-pin and 4-pin type VCSEL TOSA packages with a LC connector are the same as those of the VCSEL TO CAN packages as specified in Tables and 6.4 6.4.1 Electrical interface specifications for VCSEL TOSA package with a SC connector General The electrical interface in this standard defines only the basic functionality of each pin 6.4.2 Numbering of electrical terminals Pin numbering assignments are shown in Figure 1 C C IEC NOTE 1661/14 The electrical terminals as viewed from the bottom of the package module with pins underneath Figure – Electrical terminal numbering assignments of 3-pin and 4-pin type TOSA packages with SC connector and with optional colour code C 6.4.3 Electrical terminal assignment The pin-function definitions of the 3-pin and 4-pin type VCSEL TOSA packages with a SC connector are the same as those of the VCSEL TO CAN packages as specified in Tables and BS EN 62148-15:2014 IEC 62148-15:2014 © IEC 2014 – 12 – Outline 7.1 General The outline, dimensions and electrical interface of VCSEL TO CAN, TOSA and VCSEL pigtail packages are described as follows 7.2 Outline of VCSEL TO CAN packages 7.2.1 Drawings of case outline Case outline drawings of VCSEL TO CAN packages are shown in Figure A2 l ØD ØD K K Øb IEC Øb 1662/14 IEC Figure 4a – Outside drawing of TO CAN with flat window 1663/14 Figure 4b – Outside drawing of TO CAN with ball lens l ØD B ØD l A1 ØD ØD A α Øb IEC 1664/14 Figure 4c – Outside drawing of TO CAN with tilted window C β C β 2 3 Øa Øc Øa Øc IEC 1665/14 Figure 4d – 3-pin type TO CAN pin configuration IEC 1666/14 Figure 4e – 4-pin type TO CAN pin configuration Figure – Schematic diagrams and pin-out of VCSEL TO CANs with flat window, with ball lens, and with tilted window with optional colour code C on the bottom BS EN 62148-15:2014 IEC 62148-15:2014 © IEC 2014 7.2.2 – 13 – Dimensions of VCSEL TO CAN packages Dimensions of VCSEL TO CANs are specified in Table Table – Dimension of VCSEL TO CANs with flat window, ball lens and tilted window Dimensions mm Reference Notes Minimum Maximum φD 7.3 5,84 φ D1 3,54 4,95 A 2,65 3,75 A1 3,40 3,85 A2 4,10 4,70 B 3,30 4,27 K – 1,0 l 12,0 14,5 φ b2 0,40 0,50 α 14 30 β 89 91 φa 2,50 2,60 φc 0,4 1,3 TO 46 Only for ball lens types Tilted window type only Degree (tilted window type only) Degree Outlines of VCSEL TOSA package with an LC connector for use at low speed (below Gbps) 7.3.1 Drawings of case outline Case outline drawings of VCSEL TOSA packages are shown in Figure g a ØD b Øa i h C Øc A l c k Section A-A A j Optical plane m d IEC 1667/14 Figure – Schematic diagram of VCSEL TOSA package with LC connector and with optional colour code C on the bottom for use at low speed (below Gbps) BS EN 62148-15:2014 IEC 62148-15:2014 © IEC 2014 – 14 – 7.3.2 Dimensions of VCSEL TOSA package with an LC connector for use at a low speed (below Gbps) The dimensions of the low speed (8 Gbps) VCSEL TOSA package with an LC connector are specified in Table Table – Dimension of VCSEL TOSA package with LC connector for use at high speed (≥8 Gbps) Dimensions mm Reference Notes Minimum Maximum a 1,24 1,30 b 3,29 3,48 c 3,99 4,09 d 6,79 7,52 g 5,89 5,99 h 5,89 5,99 φD 6,26 6,65 φa 2,50 2,59 φc 0,20 0,30 j 2,88 2,95 k 5,00 5,12 i Pedestal diameter l2 m 1,2 4,12 5,10 y2 0,20 z 0,7 α 55° 59° Angle β 80° 84° Angle e 1,35 1,45 L 13,80 14,26 q 1,95 2,34 R1 0,45 0,55 s 0,85 1,01 BS EN 62148-15:2014 IEC 62148-15:2014 © IEC 2014 Dimensions mm Reference 7.6.1 Notes Minimum Maximum t 0,25 0,51 u 0,63 0,99 v 0,74 0,84 w 0,39 0,50 x 0,35 0,45 y1 4,79 4,89 φf 7.6 – 17 – 0,35 and holes Outlines of VCSEL TOSA package with an SC connector for use at high speed (≥8 Gbps) Drawings of case outline Case outline drawings of VCSEL TOSA packages with SC connector are shown in Figure BS EN 62148-15:2014 IEC 62148-15:2014 © IEC 2014 – 18 – h c b g f a d Optical plane l2 Signal plane z y2 Ground plane L q ØD s R1 Øf y1 w v C P6 P5 P4 P3 P2 P1 x t Øa u IEC 1670/14 β ØD e α Øc C h Øa IEC 1671/14 Figure – Schematic diagram of VCSEL TOSA package with SC connector and with optional colour code C for pin-type notation for use at high speed (≥8 Gbps) 7.6.2 Dimensions of VCSEL TOSA package with an SC connector for use at high speed (≥ Gbps) The dimensions of the high speed (≥8 Gbps) VCSEL TOSA package with an SC connector are specified in Table BS EN 62148-15:2014 IEC 62148-15:2014 © IEC 2014 – 19 – Table – Dimension of VCSEL TOSA package with SC connector for use at high speed (≥8 Gbps) Dimensions mm Reference a Notes Minimum Maximum 5,0 5,64 b 6,41 c 6,45 8,05 d 1,02 1,14 f 25° chamfer g 4,59 4,74 h 6,18 6,30 φD 7,21 8,05 φa 2,50 2,59 φc 0,40 0,50 l2 0,85 1,05 y2 0,11 0,16 z 0,46 0,56 α 55° 59° Angle β 80° 84° Angle e 1,35 1,45 L 14,35 15,05 q 1,95 2,34 R1 0,45 0,55 s 0,85 1,01 t 0,25 0,51 u 0,63 0,99 v 0,74 0,84 w 0,39 0,50 x 0,35 0,45 y1 4,79 4,89 φf 7.7 7.7.1 0,35 and holes Electrical terminals of high-speed (≥8 Gbps) VCSEL TOSA packages for both cases with LC and SC connectors Pin out terminals Pin out terminals of VCSEL TOSA packages with LC and SC connectors are shown in Table – 20 – BS EN 62148-15:2014 IEC 62148-15:2014 © IEC 2014 Table – Pin out terminals of VCSEL TOSA package with LC and SC connectors for use at high speed (≥8 Gbps) 7.7.2 Pin number Function (A-type) Function (K-type) VCSEL anode VCSEL cathode PD cathode PD cathode PD anode PD anode VCSEL cathode VCSEL anode Case/ground Case/ground Optional colour code (C) Yellow Violet Pad terminals Pad terminals of VCSEL TOSA packages with LC and SC connectors and with a flexible printed circuit board are shown in Table Table – Pad terminals of VCSEL TOSA package with LC and SC connectors and with flexible printed circuit board for use at high speed (≥8 Gbps) 7.8 7.8.1 PAD number Function (A-type) Function (K-type) PD cathode PD cathode Case/ground Case/ground VCSEL anode VCSEL cathode VCSEL cathode VCSEL anode Case/ground Case/ground PD anode PD anode Optional colour code (C) Yellow Violet Outlines of VCSEL pigtail package Drawings of case outline Case outline drawings of VCSEL pigtail packages are shown in Figure BS EN 62148-15:2014 IEC 62148-15:2014 © IEC 2014 – 21 – Øβ Øa f e d C b a g c IEC Figure – Schematic diagram and pin-out of VCSEL pigtail package with optional colour code C 7.8.2 Dimensions of VCSEL pigtail package The dimensions of the VCSEL pigtail package are specified in Table 10 Table 10 – Dimensions of VCSEL pigtail package Dimensions mm Reference 7.8.3 Notes Minimum Maximum φa 2,5 2,6 Diameter φβ 2,2 2,6 Diameter a 26,3 26,7 b 3,3 4,2 c 12,0 14,5 d 7,8 8,2 e 12,5 12,9 f 16,8 17,2 g 7,8 8,2 Optical connectors Refer to IEC 61754-4-1 and IEC 61754-20 1672/14 – 22 – BS EN 62148-15:2014 IEC 62148-15:2014 © IEC 2014 Bibliography IEC 60130 (all parts), Connectors for frequencies below MHz IEC 60191 (all parts), Mechanical standardization of semiconductor devices IEC 60603 (all parts), Connectors for electronic equipment IEC 60747-1, Semiconductor devices – Part 1: General IEC 60794 (all parts), Optical fibre cables IEC 60825 (all parts), Safety of laser products IEC 61076 (all parts), Connectors for electronic equipment – Product requirements IEC 61280 (all parts), Fibre optic communication subsystem test procedures IEC 61281-1, Fibre optic communication subsystems – Part 1: Generic specification IEC 61754 (all parts), Fibre optic interconnecting devices and passive components – Fibre optic connector interfaces IEC 62007-1, Semiconductor optoelectronic devices for fibre optic system applications – Part 1: Specification template for essential ratings and characteristics IEC 62007-2, Semiconductor optoelectronic devices for fibre optic system applications – Part 2: Measuring methods IEC 62149-2, Fibre optic active components and devices – Performance standards – Part 2: 850 nm discrete vertical cavity surface emitting laser devices ISO 1101, Geometrical product specifications (GPS) – Geometrical tolerancing – Tolerances of form, orientation, location and run-out _ This page deliberately left blank NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards Institution (BSI) BSI is the national body responsible for preparing British Standards and other standards-related publications, information and services BSI is incorporated by Royal Charter British Standards and other standardization products are published by BSI 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