EN 61754-23:2005

• Abstract:

  Defines the standard interface dimensions for the type LX.5 family of connectors.

• Status: Published
• Publication Date: 31-Aug-2005
• Withdrawal Date: 30-Jun-2008
• ICS: 33.180.20 - Fibre optic interconnecting devices
• Technical Committee: CLC/TC 86BXA - Fibre optic interconnect, passive and connectorised components
• Drafting Committee: IEC/SC 86B - IEC_SC_86B
• Parallel Committee: IEC/SC 86B - IEC_SC_86B
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 01-Sep-2005
• Completion Date: 25-Aug-2026
• Ref Project: SIST EN 61754-23:2006 - Fibre optic connector interfaces -- Part 23: Type LX.5 connector family

• Referred By: EN IEC 61753-021-03:2026 - Fibre optic interconnecting devices and passive components - Performance standard - Part 021-03: Single-mode fibre optic connectors terminated as pigtails and patchcords for category OP - Outdoor protected environment
• Effective Date: 26-May-2026
• Referred By: EN IEC 61753-022-13:2026 - Fibre optic interconnecting devices and passive components - Performance standard - Part 022-13: Multimode fibre optic connectors terminated as pigtails and patchcords for category OP+ HD - Extended outdoor protected environment with additional heat dissipation
• Effective Date: 26-May-2026
• Referred By: EN IEC 61753-022-02:2026 - Fibre optic interconnecting devices and passive components - Performance standard - Part 022-02: Multimode fibre optic connectors terminated as pigtails and patchcords for category C - Controlled environment
• Effective Date: 05-May-2026
• Referred By: EN 60874-1:2012 - Fibre optic interconnecting devices and passive components - Connectors for optical fibres and cables - Part 1: Generic specification
• Effective Date: 03-Feb-2026
• Referred By: EN 61753-121-2:2017 - Fibre optic interconnecting devices and passive components - Performance standard - Part 121-2: Simplex and duplex cords with single-mode fibre and cylindrical ferrule connectors for category C - Controlled environment
• Effective Date: 03-Feb-2026
• Referred By: EN 62148-15:2010 - Fibre optic active components and devices - Package and interface standards - Part 15: Discrete vertical cavity surface emitting laser packages
• Effective Date: 03-Feb-2026
• Referred By: EN IEC 62148-22:2023 - Fibre optic active components and devices - Package and interface standards - Part 22: 25 Gbit/s directly modulated laser packages with temperature control unit
• Effective Date: 03-Feb-2026
• Referred By: EN IEC 61757-1-1:2020 - Fibre optic sensors - Part 1-1: Strain measurement - Strain sensors based on fibre Bragg gratings
• Effective Date: 03-Feb-2026
• Referred By: EN IEC 62148-17:2023 - Fibre optic active components and devices - Package and interface standards - Part 17: Transmitter and receiver components with dual coaxial RF connectors
• Effective Date: 03-Feb-2026
• Referred By: EN 61300-3-22:2011 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-22: Examinations and measurements - Ferrule compression force
• Effective Date: 03-Feb-2026
• Referred By: EN 61753-121-2:2010 - Fibre optic interconnecting devices and passive components - Performance standards - Part 121-2: Simplex and duplex cords with singlemode fibre and cylindrical ferrule connectors for category C - Controlled environment
• Effective Date: 03-Feb-2026
• Referred By: EN 61300-3-33:2012 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-33: Examinations and measurements - Withdrawal force from a resilient alignment sleeve using gauge pins
• Effective Date: 03-Feb-2026
• Referred By: EN IEC 62148-1:2018 - Fibre optic active components and devices - Package and interface standards - Part 1: General and guidance
• Effective Date: 03-Feb-2026
• Referred By: EN IEC 61300-3-46:2025 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-46: Examinations and measurements - Bore diameter in rectangular ferrules
• Effective Date: 03-Feb-2026
• Referred By: EN 61753-021-3:2013 - Fibre optic interconnecting devices and passive components - Performance standard - Part 021-3: Single-mode fibre optic connectors for category U - Uncontrolled environment
• Effective Date: 03-Feb-2026

Overview

EN 61754-23:2005 (CLC adoption of IEC 61754-23:2005) defines the standard interface dimensions for the Type LX.5 fibre optic connector family. It specifies mechanical and optical reference planes, plug and adaptor interface geometries, polishing styles (PC and APC), and intermateability rules for simplex and duplex plugs/adaptors. The parent LX.5 connector is a 1.25 mm nominal ferrule design with a single coupling latch, a spring‑loaded ferrule and a single male key; optical alignment is achieved using a resilient sleeve.

Keywords: EN 61754-23:2005, Type LX.5 connector, fibre optic connector interfaces, ferrule 1.25 mm, PC/APC, duplex/simplex.

Key topics and technical requirements

• Scope and interfaces: Defines interfaces 23‑1 through 23‑6 covering simplex/duplex plugs and adaptors, and PC (physical contact) and APC (8° angled physical contact) endfaces.
• Ferrule geometry: Parent ferrule nominal diameter is 1.25 mm. Ferrule material is zirconia ceramic (alternatives permitted if compatible). Table 4 in the standard lists ferrule grade diameter ranges for Grades 1–3 (e.g., Grade 1: 1.2485–1.2495 mm).
• Endface polishing: Both PC (spherically polished) and APC 8° (angled physical contact) endface forms are specified, with dimensional tables for pedestal, radius and angle.
• Mechanical design: Connector features include a single key for orientation, spring preload for ferrule contact, and a resilient sleeve alignment mechanism. Drawings show mechanical and optical reference planes and shutter details.
• Performance tolerances and finish:
  • Ferrule compression (axial preload) requirement: 3.5 N to 6.0 N for specified datum movement.
  • Dome eccentricity of spherically polished endface: < 70 µm.
  • Maximum permitted chamfer/radius from ferrule endface: 0.5 mm.
• Intermateability rules: The standard lists which plug/adaptor polishing combinations mate (e.g., PC plugs mate with PC adaptors; APC plugs mate with APC adaptors; certain cross‑combinations do not mate).

Applications and who uses this standard

EN 61754-23 is intended for:

• Connector and ferrule manufacturers specifying mechanical tolerances and quality classes.
• Cable assembly producers and contract manufacturers designing LX.5 plug and adaptor products.
• Network equipment designers, datacenter and telecom system integrators ensuring connector compatibility.
• Test labs and procurement teams validating dimensional conformity and intermateability. Typical applications include fibre patch panels, transceivers, patchcords and optical interconnects in telecoms, datacom, FTTH and enterprise networks.

Related standards

• EN/IEC 61754 series (general guidance and other connector families) - consult Part 1 for general rules and other parts for different connector types.
• Referenced figures and tables in EN 61754-23 provide detailed drawings and dimension tables for manufacturing and testing.