SIST EN IEC 61754-6:2022/kFprA1:2026

• Status: Not Published
• Public Enquiry End Date: 31-Dec-2025
• ICS: 33.180.20 - Fibre optic interconnecting devices
• Technical Committee: MOC - Mobile Communications
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 17-Aug-2026
• Due Date: 05-Oct-2026
• Completion Date: 21-Aug-2026
• Ref Project: EN IEC 61754-6:2022/FprA1:2026 - Amendment 1 - Fibre optic interconnecting devices and passive components - Fibre optic connector interfaces - Part 6: Type MU connector family

• Amends: SIST EN IEC 61754-6:2022 - Fibre optic interconnecting devices and passive components - Fibre optic connector interfaces - Part 6: Type MU connector family (IEC 61754-6:2022)
• Effective Date: 14-Jan-2025

SIST EN IEC 61754-6:2022/kFprA1:2026 is Amendment 1 to IEC 61754-6 for fibre optic connector interfaces, published by IEC and adopted by SIST. It updates the Type MU connector family interface rules used to specify, make and check MU fibre optic connectors.

What does SIST EN IEC 61754-6:2022/kFprA1:2026 specify?

SIST EN IEC 61754-6:2022/kFprA1:2026 specifies amendments to the MU connector family part of the fibre optic connector interfaces series. In practice, it revises the reference standards, interface tables and drawings that manufacturers and test labs use when they design, inspect or compare MU connectors.

Part of the document	What it covers
Clause 2	Normative references added to support the updated interface definitions
Clause 5	Interface tables for simplex, duplex, APC and horizontal connector interfaces
Figure 8	Revised sleeve holder interface
Bibliography	Reference list cleanup

The amendment is focused on the interface definition work itself. It does not introduce a separate product family or a new testing method; it updates the geometry, grading references and related documentation for the MU family.

What are the key requirements of SIST EN IEC 61754-6:2022/kFprA1:2026?

SIST EN IEC 61754-6:2022/kFprA1:2026 changes the way MU connector interfaces are referenced and checked in several places. The practical effect is that users must follow the updated tables and the companion IEC series named in the amendment.

• Clause 2 adds two reference series: IEC 61755-3 and IEC 63267-3, both for all parts. This matters because the grade and interface data now point users to those companion documents for optical interface parameters.
• Tables 5, 7, 39, 40 and 46 update the footnote wording for the simplex, duplex and horizontal interfaces. The tables now refer to a different set of lettered positions in the drawings, so drawings and parts must be read against the amended labels.
• Tables 6, 8, 17 and 47 revise the grade entries. Grade A is left as not yet specified, while grades B to D point to the IEC 61755-3 series and grades B and C point to the IEC 63267-3 series. For users, this means the optical grade details are no longer read only from this part.
• Table 11 updates the pin gauge finish callout. The pin gauge surface reference is tightened to a roughness-based description. In practice, this affects inspection of the gauge surface rather than connector assembly alone.
• Figure 8 is replaced. The sleeve holder interface drawing is updated, so any design or verification work that depends on that interface should use the revised figure.
• Tables 41 and 42 are replaced for the duplex plug connector interface. These tables update the geometry notes, the movable delatch housing description and the compression-force condition used for checking the ferrule position.
• Table 42 also adds a dome eccentricity note. That gives a specific check for the ferrule endface shape, which matters during manufacturing and acceptance testing.

What terms does SIST EN IEC 61754-6:2022/kFprA1:2026 define?

• delatch housing - The movable housing referenced in the duplex interface notes; its position affects the dimensional references used for the connector state.
• mechanical datum target - The mechanical reference point used in the interface notes to locate and compare connector positions.
• optical datum target - The optical reference point used with the mechanical datum target when checking ferrule movement.
• ferrule compression force - The axial force applied to the ferrule during the interface check; it is part of the connector verification condition.
• APC reference plane - The plane used to define the angled APC geometry in the connector interface notes.
• dome eccentricity - The endface shape check used for the spherically polished ferrule in the duplex interface table.
• grade - The document’s way of linking an interface version to the related optical interface parameter series.

Who uses SIST EN IEC 61754-6:2022/kFprA1:2026?

SIST EN IEC 61754-6:2022/kFprA1:2026 is used by fibre optic connector manufacturers, component suppliers, test laboratories, and quality teams that specify or verify MU connector interfaces. It is also useful for buyers and system integrators who need to confirm that parts from different sources match the same interface definition.

What changed in SIST EN IEC 61754-6:2022/kFprA1:2026 from the previous edition?

SIST EN IEC 61754-6:2022/kFprA1:2026 is Amendment 1 to IEC 61754-6 Edition 3.0 (2022-02). The amendment revises the normative references, several interface tables, Figure 8, and the bibliography.

Which standards are used with SIST EN IEC 61754-6:2022/kFprA1:2026?

• IEC 61755-3 (all parts) - Added in Clause 2 for connector optical interface parameters for dispersion unshifted single-mode physically contacting fibres.
• IEC 63267-3 (all parts) - Added in Clause 2 for connector optical interface parameters for enhanced macro bend multimode fibres.
• IEC 61755-3-2 - Named in the replaced tables for the interface reference used in the updated dimensional notes.
• IEC 63267-1 - Named in Table 43 for the updated grade reference.
• IEC 61300-3-22 - Named for measuring the compression force used in the duplex interface notes.

What does the SIST EN IEC 61754-6:2022/kFprA1:2026 document contain?

The document contains amended dimension tables for simplex, duplex, APC and horizontal MU connector interfaces, plus the pin gauge table and the sleeve holder interface figure. It also contains the related notes that explain how to read moving parts, reference positions and connector state. For users, those tables are the working part of the standard for design checks, supplier drawings and conformance testing.

SLOVENSKI STANDARD
SIST EN IEC 61754-6:2022/oprA1:2025
01-december-2025
Optični spojni elementi in pasivne komponente - Vmesniki za optične konektorje -
6. del: Konektorska družina vrste MU - Dopolnilo A1
Fibre optic interconnecting devices and passive components - Fibre optic connector
interfaces - Part 6: Type MU connector family
Lichtwellenleiter - Verbindungselemente und passive Bauteile - Steckgesichter von
Lichtwellenleiter-Steckverbindern - Teil 6: Steckverbinderfamilie der Bauart MU
Dispositifs d’interconnexion et composants passifs fibroniques - Interfaces de
connecteurs fibroniques - Partie 6: Famille de connecteurs de type MU
Ta slovenski standard je istoveten z: EN IEC 61754-6:2022/prA1:2025
ICS:
33.180.20 Povezovalne naprave za Fibre optic interconnecting
optična vlakna devices
SIST EN IEC 61754-6:2022/oprA1:2025 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

SIST EN IEC 61754-6:2022/oprA1:2025

SIST EN IEC 61754-6:2022/oprA1:2025
86B/5125/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61754-6/AMD1 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-10-17 2026-01-09
SUPERSEDES DOCUMENTS:
86B/4997/CD, 86B/5034A/CC
IEC SC 86B : FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS
SECRETARIAT: SECRETARY:
Japan Mr Ryo Koyama
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):

ASPECTS CONCERNED:
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some
Countries” clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is
the final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Amendment 1 - Fibre optic interconnecting devices and passive components - Fibre optic
connector interfaces - Part 6: Type MU connector family

PROPOSED STABILITY DATE: 2032
NOTE FROM TC/SC OFFICERS:
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
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SIST EN IEC 61754-6:2022/oprA1:2025
IEC CDV 61754-6/AMD1 © IEC 2025
1 INTERNATIONAL ELECTROTECHNICAL COMMISSION
3 _____________
5 IEC 61754-6
6 Edition 3.0 2022-02
7 Fibre optic interconnecting devices and passive components – Fibre optic connector
8 interfaces - Part 6: Type MU connector family
9 AMENDMENT 1
10 2 Normative references
11 Add the following references:
12 IEC 61755-3 (all parts), Fibre optic interconnecting devices and passive components - Connector optical interfaces:
13 Connector parameters of dispersion unshifted single-mode physically contacting fibres
14 IEC 63267-3 (all parts), Fibre optic interconnecting devices and passive components – Connector optical interfaces
15 for enhanced macro bend multimode fibres: Connector parameters of physically contacting 50 µm core diameter
16 fibres
18 5 Interfaces
19 Table 5 – Dimensions of the simplex plug connector interface
20 In footnote b, replace “L, M and V” with “I, P, Q and R”.
22 Table 6 – Grade of the simplex plug connector
23 In the row for grade A, replace the content in the second and third column with “Grade not
24 specified at this time”.
25 In the rows for grades B to D, replace the content in the second and third column with “Refer to
26 IEC 61755-3 series”.
27 In the rows for grades B and C , replace the minimum and maximum values or the text with
m m
28 “Refer to IEC 63267-3 series”.
29 Delete note b “See IEC 61755-6-1 for guidance”.
31 Table 7 – Dimensions of the 4,5 mm duplex plug connector interface
32 In footnote b, replace “L, M and V” with “I, P, Q and R”.
SIST EN IEC 61754-6:2022/oprA1:2025
IEC CDV 61754-6/AMD1 © IEC 2025
35 Table 8 – Grade of the 4,5 mm duplex plug connector
36 In the row for grade A, replace the content in the second and third column with “Grade not
37 specified at this time”.
38 In the rows for grades B to D, replace the content in the second and third column with “Refer to
39 IEC 61755-3 series”.
40 In the rows for grades B and C , replace the minimum and maximum values or the text with
m m
41 “Refer to IEC 63267-3 series”.
42 Delete note b “See IEC 61755-6-1 for guidance”.
44 Table 11 – Pin gauge dimensions
45 In the last column, row LK, replace “grade N4 (0,2 μm radius)” with “Ra: ≤0.000 2”.
47 Table 17 – Grade of the plug connector
48 In the row for grade A, replace the content in the second and third column with “Grade not
49 specified at this time”.
50 In the rows for grades B to D, replace the content in the second and third column with “Refer to
51 IEC 61755-3 series”.
52 In the rows for grades B and C , replace the minimum and maximum values or the text with
m m
53 “Refer to IEC 63267-3 series”.
54 Delete note b “See IEC 61755-6-1 for guidance”.
56 Figure 8 – Sleeve holder int
...