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eLibrary > BS EN 50174-4:2025 Information technology. Cabling installation - Testing of installed optical fibre cabling >

BS EN 50174-4:2025 Information technology. Cabling installation - Testing of installed optical fibre cabling, 2025

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Contents Page
European foreword
Introduction
Figure 1 — Schematic relationship between the EN 50174 series and other relevant standards
Table 1 — Contextual relationship between EN 50174 series and other standards relevant for information technology cabling systems
1 Scope
2 Normative references
3 Terms, definitions, abbreviated terms and symbols [Go to Page]
3.1 Terms and definitions
3.2 Abbreviated terms
3.3 Symbols
4 Conformance
5 Test equipment [Go to Page]
5.1 General requirements
5.2 Documentation
5.3 Apparatus
5.4 Light source and power meter [Go to Page]
5.4.1 Light source [Go to Page]
5.4.1.1 General
5.4.1.2 Stability
5.4.1.3 Launch condition
5.4.1.4 Spectral characteristics
Table 2 — MMF spectral requirements
Table 3 — SMF spectral requirements [Go to Page]
5.4.2 Power meter
5.5 OTDR [Go to Page]
5.5.1 General
5.5.2 OTDR requirements [Go to Page]
5.5.2.1 General
5.5.2.2 OTDR characterization using test cords
Figure 2 — OTDR characterization using a launch test cord and a tail test cord [Go to Page]
5.6 Test cord connectors [Go to Page]
5.6.1 Connecting hardware at test interfaces
5.6.2 Connecting hardware attenuation requirements
Table 4 — Connector identification and attenuation test limits [Go to Page]
5.6.3 Mechanical requirements for reference connectors [Go to Page]
5.6.3.1 Requirements for MM LC and other MM single fibre reference connectors
Table 5 — Single fibre MM reference connector requirements [Go to Page]
5.6.3.2 Requirements for SM LC and other single fibre reference connectors
Table 6 — Single fibre single-mode reference connector requirements [Go to Page]
5.6.3.3 End-face geometry for LC and other single fibre reference connectors
5.6.3.4 Requirements for MM MPO and other multi-fibre connectors
Table 7 — Multi-fibre MM reference connector requirements [Go to Page]
5.6.3.5 Requirements for SM MPO and other multi-fibre connectors
Table 8 — Multi-fibre single-mode reference connector requirements [Go to Page]
5.6.3.6 End-face geometry requirements for MPO and other multi-fibre connectors
5.6.4 Reference adaptors at test interfaces
5.7 Test cord characteristics [Go to Page]
5.7.1 General
Figure 3 — An example of test cord labelling and identification [Go to Page]
5.7.2 LSPM launch test cord
5.7.3 LSPM tail test cord
5.7.4 LSPM substitution test cord
5.7.5 OTDR launch test cord
Figure 4 — OTDR launch test cord and tail test cord schematic [Go to Page]
5.7.6 OTDR tail test cord
5.8 Visual inspection equipment
Figure 5 — Normal illumination (left) and illumination with floodlight (right)
6 Testing [Go to Page]
6.1 General
6.2 Reference planes
Figure 6 — Representative reference planes for channels, links, permanent links, E2E links, MPTL
Figure 7 — Test reference planes [Go to Page]
6.3 Wavelength of measurement
6.4 Direction of measurement
6.5 Protection of transmission and terminal equipment
6.6 Use of test equipment
6.7 Relevance of measurement
6.8 Visual inspection for cleanliness and cleaning of cabling interfaces
Figure 8 — Fibre end face cleaning cycle [Go to Page]
6.9 Testing of installed cabling [Go to Page]
6.9.1 General
6.9.2 Attenuation of single fibre connector cabling – LSPM [Go to Page]
6.9.2.1 General
6.9.2.2 Link and permanent link testing [Go to Page]
6.9.2.2.1 General
6.9.2.2.2 Requirements for the test system
6.9.2.2.3 Test method
Figure 9 — Connection of LS to LTC to PM for reference setting
Figure 10 — Connection of LTC to TTC to verify attenuation of reference connectors
Figure 11 — Connections to link or permanent link for attenuation measurement [Go to Page]
6.9.2.2.4 Measurement uncertainties
6.9.2.2.5 Treatment of results
6.9.2.3 E2E link testing [Go to Page]
6.9.2.3.1 General
6.9.2.3.2 Requirements for the test system
6.9.2.3.3 Test method
Figure 12 — Connection of LS to LTC to PM for reference setting
Figure 13 — Connection of LTC to TTC to verify attenuation of reference connectors
Figure 14 — Connections to E2E link for attenuation measurement [Go to Page]
6.9.2.3.4 Measurement uncertainties
6.9.2.3.5 Treatment of results
6.9.2.4 Channel testing [Go to Page]
6.9.2.4.1 General
6.9.2.4.2 Requirements for the test system
6.9.2.4.3 Test method
Figure 15 — Connection of LS to LTC to near end EQP cord to PM for reference setting
Figure 16 — Connections to channel test for attenuation measurement [Go to Page]
6.9.2.4.4 Measurement uncertainties
6.9.2.4.5 Treatment of results
6.9.2.4.6 Test result
6.9.2.5 MPTL testing [Go to Page]
6.9.2.5.1 General
6.9.2.5.2 Requirements for the test system
6.9.2.5.3 Test method
Figure 17 — Connection of LS – LTC – PM for reference setting
Figure 18 — Connection of LTC to TTC to verify attenuation of reference connectors
Figure 19 — Connections to MPTL for attenuation measurement [Go to Page]
6.9.2.5.4 Measurement uncertainties
6.9.2.5.5 Treatment of results
6.9.3 Attenuation of multi-fibre connector cabling – LSPM [Go to Page]
6.9.3.1 General
6.9.3.2 MPO to MPO link or permanent link testing – One-test-cord reference method LSPM [Go to Page]
6.9.3.2.1 General
6.9.3.2.2 Requirements for the test system
6.9.3.2.3 Test method
Figure 20 — Connection of LS to LTC to PM for reference setting
Figure 21 — Connection of LTC to TTC for test‐cord verification
Figure 22 — Connections to link or permanent link attenuation [Go to Page]
6.9.3.2.4 Measurement uncertainties
6.9.3.2.5 Treatment of results
6.9.3.3 MPO E2E link testing– enhanced-three-test-cord reference method LSPM [Go to Page]
6.9.3.3.1 General
6.9.3.3.2 Requirements for the test system
6.9.3.3.3 Test method
Figure 23 — Connection of LS to LTC to PM for reference setting
Figure 24 — Connection of LTC-PCTC-TTC to verify the attenuation of reference connectors
Figure 25 — Connections to E2E link for attenuation measurement [Go to Page]
6.9.3.3.4 Measurement uncertainties
6.9.3.3.5 Treatment of results
6.9.3.4 MPO to single-fibre connector E2E link testing [Go to Page]
6.9.3.4.1 General
6.9.3.4.2 Requirements for the test system
6.9.3.4.3 Test method
Figure 26 — Connection of LS to LTC to PM for reference setting
Figure 27 — Connection of LTC to TTC for test‐cord verification
Figure 28 — Connection of LTC to PCTC to TTC for enhanced-three‐test‐cord verification
Figure 29 — MPO to single fibre link attenuation testing where no pin conversion is required on launch test cord
Figure 30 — MPO to single fibre link attenuation testing where pin conversion is required on LTC [Go to Page]
6.9.3.4.4 Measurement uncertainties
6.9.3.4.5 Treatment of results
6.9.4 Attenuation of link and channel by means of OTDR testing [Go to Page]
6.9.4.1 General
6.9.4.2 Test equipment requirements
6.9.4.3 Test method for link, permanent link, E2E link, MPTL [Go to Page]
6.9.4.3.1 General
6.9.4.3.2 Measurement uncertainties
6.9.4.3.3 Treatment of results
Figure 31 — OTDR measurement of installed cabling (permanent link) – linear regression measurement method [Go to Page]
6.9.4.4 Test method for channel [Go to Page]
6.9.4.4.1 Test method
6.9.4.4.2 Measurement uncertainties
6.9.4.4.3 Treatment of results
Figure 32 — OTDR measurement of installed cabling (channel): two-point attenuation measurement method [Go to Page]
6.9.5 Propagation delay [Go to Page]
6.9.5.1 General
6.9.5.2 Test equipment requirements
6.9.5.3 Test method for propagation delay [Go to Page]
6.9.5.3.1 General
6.9.5.3.2 Measurement uncertainty
6.9.5.4 Treatment of results
6.9.6 Length [Go to Page]
6.9.6.1 General
6.9.6.2 Test equipment requirements
6.9.6.3 Test method for length [Go to Page]
6.9.6.3.1 General
6.9.6.3.2 Measurement uncertainties
6.9.6.4 Treatment of results
6.9.7 Optical fibre continuity
6.9.8 Cabling polarity
6.9.9 Optical fibre core size
7 Performance assessment of installed cabling components using OTDR [Go to Page]
7.1 General
7.2 OTDR basis
7.3 Fundamental parameters that define the operational capability of an OTDR [Go to Page]
7.3.1 Dynamic range
7.3.2 Dynamic margin
7.3.3 Pulse width
7.3.4 Averaging time
7.3.5 Dead zone
7.3.6 Group index
Table 9 — Default group index values [Go to Page]
7.3.7 Measurement range
7.3.8 Distance sampling
7.3.9 Event threshold
7.4 Bi-directional measurement
7.5 Attenuation of optical fibre cable [Go to Page]
7.5.1 Test method [Go to Page]
7.5.1.1 General
7.5.1.2 Measurement uncertainties
7.5.2 Treatment of results
Figure 33 — OTDR measurement of optical fibre attenuation [Go to Page]
7.6 Attenuation of local and remote test interfaces [Go to Page]
7.6.1 Test method
7.6.2 Test system measurement uncertainties
7.6.3 Treatment of results
Figure 34 — OTDR measurement of connection attenuation [Go to Page]
7.7 Attenuation of connecting hardware [Go to Page]
7.7.1 Test method
7.7.2 Test system measurement uncertainties
7.7.3 Treatment of results
Figure 35 — OTDR measurement of joint attenuation [Go to Page]
7.8 Return loss of connecting hardware [Go to Page]
7.8.1 General
7.8.2 Test method
Figure 36 — OTDR measurement of return loss [Go to Page]
7.8.3 Test system measurement uncertainties
7.8.4 Treatment of results
Table 10 — Default backscattering coefficient values [Go to Page]
7.9 Optical fibre length [Go to Page]
7.9.1 Test method
Figure 37 — Determination of length using an OTDR
Figure 38 — OTDR characterization of a SMF permanent link containing a break
Figure 39 — OTDR characterization of a permanent link containing a macrobend [Go to Page]
7.9.2 Measurement uncertainties
7.9.3 Treatment of results
8 Test result documentation
Annex A (normative) Test cord attenuation verification
A.1 General requirements
A.2 Attenuation (test and substitution test cord reference connections)
Figure A.1 — Measurement of launch test cord, tail test cord and substitution test cord interface attenuation
Annex B (informative) Quality planning
B.1 General
B.2 Specification of cabling components
B.3 Treatment of non-compliant results
Annex C (informative) Examples of calculations of channel and permanent link limits
C.1 Channel measurement
C.2 Permanent link measurement
Annex D (informative) Optional inspection of polished end face of test connectors
Table D.1 — Cladding zone requirements of reference connectors
Table D.2 — Core zone requirements of reference connectors
Annex E (normative) Cleaning of connectors
E.1 General
E.2 Cleaning procedure for LC multimode cabling interface
Figure E.1 — Example of multimode LC channel interface
Figure E.2 — Example of multimode LC link interface
Figure E.3 — Example of MPO channel interface
Figure E.4 — Example of MPO link interface
Figure E.5 — Example of MPO ferrule with normal illumination (left) and side illumination (right)
E.3 Cleaning procedure for the LC single-mode cabling interfaces
Figure E.6 — Example of single-mode LC channel interface
Figure E.7 — Example of single-mode LC link interface
E.4 Cleaning procedure for the LC/APC single-mode cabling interfaces
Figure E.8 — Example of single-mode LC/APC channel interface
Figure E.9 — Example of single-mode LC/APC link interface
E.5 Cleaning procedure for single-mode (SM) MPO APC cabling interface
Figure E.10 — Example of SM MPO APC channel interface
Figure E.11 — Example of SM MPO/APC link interface
Annex F (normative) MPO to MPO link or permanent link – enhanced-three-test-cord method LSPM
F.1 General
F.2 Requirements for the test system
F.3 Test method
Figure F.1 — Connection of LS to LTC to PM for reference setting
Figure F.2 — Connection of LTC to STC to TTC for enhanced-three‐test‐cord verification
Figure F.3 — Connections to link or permanent link for attenuation measurement where no pin conversion is required on test cords
F.4 Measurement uncertainties
F.5 Treatment of results
Bibliography [Go to Page]

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