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Product definition
This European Standard outlines the essential dimensional, optical, mechanical, and environmental performance requirements for a terminated and assembled singlemode resilient alignment sleeve LX.5 APC connector set (including plug, adaptor, and plug) to qualify as an EN standard product.
Since different variants and grades of performance are permitted, product marking details are given in 3.6.
Intermateability
All products meeting the criteria of this European Standard will be compatible with each other; however, the level of random attenuation performance will only be guaranteed as specified in Table 1 This assurance applies regardless of the manufacturing sources of the products.
When intermating plug variants having different attenuation grades, the resulting level of attenuation cannot be assured to be any better than the worst attenuation grade
The intermating of a grade C plug with a grade B plug will result in an uncertain level of random attenuation performance
Table 1 – Ensured level of random attenuation
Operating environment
The tests selected combined with the severities and durations are representative of a category U environment described in EN 61753-1.
Reliability
The expected service life of the product in this environment is 20 years; however, adherence to this specification does not ensure its reliability Reliability should be evaluated using a recognized assessment program.
Quality assurance
Compliance with this specification does not guarantee the manufacturing consistency of the product This should be maintained using a recognised quality assurance programme
The referenced documents are essential for applying this document For dated references, only the specified edition is applicable, while for undated references, the most recent edition, including any amendments, is relevant.
EN 60793-2-50 Optical fibres – Part 2-50: Product specifications – Sectional specification for class B single-mode fibres (IEC 60793-2-50)
EN 61300 (series) Fibre optic interconnecting devices and passive components – Basic test and measurement procedures (IEC 61300 series)
EN 61300-2-1 Part 2-1: Tests – Vibration (sinusoidal) (IEC 61300-2-1)
EN 61300-2-2 Part 2-2: Tests – Mating durability (IEC 61300-2-2)
EN 61300-2-4 Part 2-4: Tests – Fibre/cable retention (IEC 61300-2-4)
EN 61300-2-5 Part 2-5: Tests – Torsion/twist (IEC 61300-2-5)
EN 61300-2-6 Part 2-6: Tests – Tensile strength of coupling mechanism (IEC 61300-2-6)
EN 61300-2-7 Part 2-7: Tests – Bending moment (IEC 61300-2-7)
EN 61300-2-12:2009 Part 2-12: Tests – Impact (IEC 61300-2-12:2009)
EN 61300-2-17 Part 2-17: Tests – Cold (IEC 61300-2-17)
EN 61300-2-18 Part 2-18: Tests – Dry heat – High temperature endurance (IEC 61300-2-18)
EN 61300-2-22 Part 2-22: Tests – Change of temperature (IEC 61300-2-22)
EN 61300-2-26 Part 2-26: Tests – Salt mist (IEC 61300-2-26)
EN 61300-2-27 Part 2-27: Tests – Dust – Laminar flow (IEC 61300-2-27)
EN 61300-2-42 Part 2-42: Tests – Static side load for connectors (IEC 61300-2-42)
EN 61300-2-44 Part 2-44: Tests – Flexing of the strain relief of fibre optic devices (IEC 61300-2-44)
EN 61300-2-46 Part 2-46: Tests – Damp heat cyclic (IEC 61300-2-46)
EN 61300-3-6:2009 Part 3-6: Examinations and measurements – Return loss (IEC 61300-3-6:2008)
EN 61300-3-10 Part 3-10: Examinations and measurements – Gauge retention force (IEC 61300-3-10)
EN 61300-3-15 Part 3-15: Examinations and measurements – Dome eccentricity of a convex polished ferrule endface (IEC 61300-3-15)
EN 61300-3-16 Part 3-16: Examinations and measurements – Endface radius of spherically polished ferrules (IEC 61300-3-16)
EN 61300-3-23 Part 3-23: Examination and measurements – Fibre position relative to ferrule endface
EN 61300-3-28 Part 3-28: Examinations and measurements – Transient loss (IEC 61300-3-28)
EN 61300-3-34 Part 3-34: Examinations and measurements - Attenuation of random mated connectors (IEC 61300-3-34)
EN 61300-3-42 Part 3-42: Examinations and measurements - Attenuation of single mode alignment sleeves and or adaptors with resilient alignment sleeves (IEC 61300-3-42)
EN 61753-1 Fibre optic interconnecting devices and passive components performance standard –
Part 1: General and guidance for performance standards (IEC 61753-1)
EN 61754-23 Fibre optic connector interfaces – Part 23: Type LX.5 connector family (IEC 61754-23) ISO 8015 Technical drawings – Fundamental tolerancing principle
General
The LX.5 APC connector is a single-position plug connector featuring a plug/adaptor/plug configuration It is distinguished by its cylindrical, spring-loaded butting ferrules with a nominal diameter of 1.25 mm and a latched push-pull coupling mechanism Additionally, the connectors utilize a resilient sleeve style for optical alignment.
Plug
The plug is designed with a cylindrical zirconia ceramic ferrule and incorporates a latched push-pull mechanism It includes a single male key that serves to limit and orient the relative rotation between connected mated connectors.
A cover (dustcap) to protect the ferrule endface is integrated in the connector.
Duplex adaptor
The adaptor features a resilient alignment sleeve made of zirconia ceramic While alternative materials with compatible properties may be utilized for the sleeve, it is essential that the endface and performance requirements are consistently met under all conditions.
The mounting style can be: a) square flange - 2 hole fixing; b) square flange - clip fixing
Covers (dustcaps) are integrated in each port of the adaptor.
Materials
Materials which are not specified or which are not specifically described are left to the discretion of the manufacturer.
Dimensions
The article specifies the outline dimensions and other critical measurements necessary for intermateability and performance, while allowing manufacturers discretion over additional dimensions It also clearly indicates when the mating face limit dimensions do not align with an EN interface standard.
Colour and marking
Marking of the product shall be in the following order of precedence:
– manufacturing date code: year/week;
The following colour coding scheme is preferred
Green Green NOTE The preferred green is RAL 6024
Terminated plug
The following variants are permitted
Adaptor
The following variants are permitted
Outline dimensions
Figure 1 a) Outline dimensions buffered fibre
Figure 1 b) Outline dimensions reinforced cable
Reference Dimensions Notes min mm max
Reference Dimensions Notes min mm max a 27,5 27,8 b 12,9 13,05 c 9,3 9,45 d 9,5 10,0 e 13,0 13,5
NOTE Panel thickness should not exceed 1,7 mm a) Outline dimensions – Adaptor variant C01
Reference Dimensions Notes min mm max a 27,5 27,8 b 12,9 13,1 c 9,3 9,4 d 9,5 10,0 e 13,0 13,5 f 17,9 18,1 g M2 NOTE Panel thickness should not exceed 1,7 mm b) Outline dimensions – Adaptor variant A02 Figure 2 – Outline dimensions – Duplex adaptor
Panel cut out See Note
Panel cut out See Note
Mating face and other limit dimensions
The dimensions of the mating face adhere to the EN 61754-23 standard, as illustrated in Figure 3, which includes the reference planes of the plug connector interface and its various components.
The article discusses the plug connector interface, highlighting the mating face and limit dimensions It includes an expanded view from the front and details the duplex plug interface, as illustrated in Figure 3.
Reference Dimensions Notes min mm max.
The basic dimension AA for a plug endface is specified when not mated, with the ferrule being adjustable under a specific axial compression force This force should range from 3.5 N to 6.0 N when the optical datum target position, dimension AA, is adjusted between 12.90 mm and 12.50 mm, applicable only for buffered fiber For alternative cord constructions, higher forces of 5.0 N to 7.0 N are permissible Additionally, the envelope condition must comply with ISO 8015 standards, and the surface roughness should not exceed R a ≤ 0.1 µm.
Figure 3 – Mating face and other limit dimensions of plug connector interface (continued)
5.2.2 Ferrule endface geometry and fibre core position after termination
Figure 4 – Ferrule end face geometry – After termination
Figure 5 – Positioning of fibre core Table 5 – Geometrical parameters
Notes Grade B Grade C min max min max
The specifications for the ferrule made of 3 mol% Yttria stabilized Zirconia (ZrO₂) include a minimum contact force of 4.9 N, a grain size of less than 0.35 µm, a Young’s modulus of (200 ± 20) GPa, and a Poisson ratio ranging from 0.30 to 0.31 The dome offset is defined as the distance between the ferrule center and the vertex of the spherically polished endface, measured relative to the angled PC reference plane, and should be assessed in both extreme positions of the ferrule during rotation in the connector Additionally, the radius and fiber undercut must be measured in all directions over a diameter of 0.25 mm, with negative values indicating fiber protrusion.
Figure 6 – Ferrule end face geometry – Allowable undercut
The parameters outlined in the figure and values above must be satisfied by each individual plug to guarantee that the required random attenuation performance grade is achieved in every connection.
Allowable undercut for 2,9 N contact force and 50 àm apex offset
A llo w abl e under cut [nm ]
Figure 7 shows the relationship between the axis of the fibre and the position of the fibre core relative to the optical datum (see 5.2.2)
NOTE Ideal reference plug has zero angular offset and zero lateral offset
The parameters outlined in the figure and values above must be satisfied by each individual plug after termination to guarantee compliance with the designated random attenuation performance grade.
The maximum values for the parameters required by any plug after manufacturing are represented by the graph lines for grade B and grade C To achieve the specified random performance, a Raleigh distribution must be applied to each of these parameters These lines are derived from a worst-case scenario involving field diameter mismatch.
W i is the mode field radii (àm), i = 1, 2
(calculation for the above curve is done with worst case mode field diameter mismatch
N 1 is the refractive index between the end faces
(in this case it is equal with the refractive index of the core); a is the fibre core offset (àm); τ ) is the fibre angle (radian); λ is the wavelength
(calculation for the above curve is done with 1 310 nm)
Figure 7 – Requirements for the attenuation grades for the plug fibre core connected to the ideal reference
Core offset between fibre core and ideal reference plug [àm]
A ngul a r offs e t be tw e e n fi br e a x is a nd i d e a l r e fe re nc e [° ]
5.2.4 LX.5 duplex adaptor a) Adaptor interface Figure 8 – Adaptor mating face and other limit dimensions b) Adaptor interface – Section A – A c) Adaptor interface – Section B – B Figure 8 – Adaptor mating face and other limit dimensions (continued)
Reference Dimensions Notes min mm max.
The connector alignment feature consists of a resilient (split) alignment sleeve, which can be either fixed or floating For a fixed sleeve, the positional tolerance of dimension BU applies to both BU and A dimensions In the case of a floating sleeve, a gauge pin must move freely to align with datum AA Dimension A specifies the inner diameter of the alignment feature The alignment feature must accommodate a pin gauge with a force of 1.0 N to 2.5 N, ensuring that when a second pin gauge is inserted from the opposite side, both gauges meet The pin gauge measures 1.249 mm, and the centre of the adaptor is indicated by the left side position of dimension AA Additionally, the area utilized by the adaptor door is relevant when the plug is fully inserted, while the wall defined by dimension ED is not necessary.
Figure 8 – Adaptor mating face and other limit dimensions (continued)
Reference Dimensions Notes min mm max.
NOTE 1 Envelope condition in accordance with ISO 8015
Figure 9 – Pin gauge for adaptor
Sample size
For the purpose of this European Standard a sample is defined as a plug/adaptor/plug connector set or a patchcord
All samples shall be randomly selected
The sample size and product sourcing requirements are given in Annex C
The length of cable (or fibre) on each side of the connector set shall be 2 m minimum
The length of the patchcord samples which shall be included in the test chamber together with the two attached connectors is 3 m to 5 m.
Test and measurement methods
All tests and measurements have been selected from EN 61300 series
Unless otherwise stated in the individual test details all attenuation measurements shall be performed at both
(1 310 ± 30) nm and (1 550 ± 30) nm, all return loss measurements shall be performed at (1 550 ± 30) nm
Attenuation change is defined as the difference between the maximum and minimum values of attenuation measured during the test
No deviation from the specified test method is allowed
Attenuation measurement against reference (EN 61300-3-4) should be repeated for quality conformance, while random attenuation (EN 61300-3-34) is utilized solely during qualification to verify that the appropriate grade requirements are satisfied.
Reference connector and measurement against reference requirements are specified in Annex A.
Test sequence
All products will undergo Test 1, after which Tests 2 to 19 can be conducted in any order It is essential to measure the end face geometry of each batch of connectors both before and after the tests.
Pass/Fail criteria
A product will have met the requirements of this European Standard provided no failures occur in the sample group for any test
In the event of a failure occurring, the test shall be re run using a sample size double that of the original
A comprehensive test report, along with supporting data, must be prepared and made available for inspection to demonstrate that the tests outlined in Clause 8 have been conducted in compliance with this European Standard.
Dimensional and marking requirements
The product's dimensions and markings, along with any related spring force, must comply with the specifications outlined in Section 3.6 and Clause 5, and should be measured and inspected using the relevant EN testing methods.
End face geometry shall be measured before and after the completion of climatic testing and shall meet the requirements as stated in 5.2.2
The methods to be used are EN 61300-3-15, EN 61300-3-16 and EN 61300-3-23.
Optical performance requirements
Position the slit of the sleeve at the 12, 3, 6, and 9 o’clock positions, and measure the attenuation of the adaptor between two matched reference connectors Then, reverse the adaptor between the connectors and measure the attenuation once more with the slit at the same positions.
Source type: LED Peak wavelength: (1 310 ± 30) nm
Source stability: ≤ ± 0,01 dB over the measuring period or at least 1 h
Detector linearity: Within ± 0,01 dB over the dynamic range to be measured
Launch fibre length: ≥ 2 m – Only the fundamental mode shall propagate at the connector interface to be tested and at the detector
Clean plug and adaptor according to manufacturer's instructions
≤ 0,25 dB for ≥ 97 % of measurements Grade C
For plug / adaptor / plug connector sets,
10 adaptors, randomly selected shall be used
(100 randomly mated connector sets) Total number of measurements
100 times the number of fibres in each plug
Source type: LED/LD Peak wavelength: (1 310 ± 30) nm
Source stability: ≤ ± 0,01 dB over the measuring period or at least 1 h
Detector linearity: Within ± 0,01 dB over the dynamic range to be measured
Launch fibre length: > 2 m – Only the fundamental mode shall propagate at the connector interface to be tested and at the detector
Clean plug and adaptor according to manufacturer's instructions
Table 6 – Optical performance requirements (continued)
For plug / adaptor / plug connector sets,
10 adaptors, randomly selected shall be used
(100 randomly mated connector sets) Total number of measurements
100 times the number of fibres in each plug
Method: EN 61300-3-6:2009, Method 1 Source type: LD
Source stability: ≤ ± 0,05 dB over the measuring period or at least 1 h
Detector linearity: Within ± 0,05 dB over the dynamic range to be measured
Launch fibre length: > 2 m – Only the fundamental mode shall propagate at the connector interface to be tested and at the detector
To ensure quality conformance, clean the plug and adaptor following the manufacturer's instructions A matched reference connector is defined in Annex B, and attenuation measurement tests against these connectors (EN 61300-3-4) should be utilized Additionally, the random mating attenuation test (EN 61300-3-34) is essential during qualification to verify compliance with the specified grade requirements.
Mechanical performance requirements
Initial and final attenuation shall be ≤ specified for the grade
Frequency range: 10 Hz to 55 Hz at 1 octave/min Vibration amplitude: 0,75 mm
Measurements required: Before, during and after test
Sampling rate: Max sampling interval shall be 2 ms
Clean plug and adaptor according to manufacturer’s instructions
Initial and final attenuation shall be ≤ specified for the grade
Mechanism to be cycled: Plug-Adaptor
Number of cycles: 500 (Only one plug is subjected to successive engagement and separation.)
Not less than 3 s between engagements
Measurements required: After every mating
Clean plug and adaptor according to manufacturer's instructions
During testing, if the attenuation exceeds the allowable limit or the return loss falls below acceptable levels, it is permissible to clean the connector as needed, but not excessively.
25 times during the course of the test (The measurement at which the cleaning takes place shall be discounted from the test results.)
Table 7 – Mechanical performance requirements (continued)
(Initial and final attenuation shall be within specified grade.)
Magnitude and rate of application of the tensile force:
Point of application of the load: Var 01:
On strength member 0,3 m from plug The connector shall be rigidly mounted such that the load is applied to the fibre/cable retention mechanism and not to the coupling mechanism
Duration of load: 120 s at 70 N and 100 N;
Measurements required: Before, during (continuous) and after the test (5 min recovery period)
Sampling rate: Measurements shall be made after the load has been maintained at its maximum level for at least 30 s
Clean plug and adaptor according to manufacturer's instructions
(Initial and final attenuation shall be within specified grade.)
Magnitude of load: Var 02 to 04:
Rate of application of the load: 2 N/s
Point of application of the load:
Measurements required: Before, during and after the test
Sampling rate: Measurements shall be made after the load has been maintained at its maximum level for at least 30 s
Pre-conditioning procedure: Clean plug and adaptor according to manufacturer's instructions
Table 7 – Mechanical performance requirements (continued)
(Initial and final attenuation shall be within specified grade.)
Method: EN 61300-2-12:2009, Method A Number of drops: 5
Specimen optically functioning: No (Specimen shall be unmated during impact test.)
Before and after the test
Pre-conditioning procedure: Fit dust cap
Recovery procedure: Clean plug and adaptor according to manufacturer's instructions
(Initial and final attenuation shall be within specified grade.)
Magnitude and rate of application of the load:
No of cycles: 25 cycles ± 180° (not to exceed cable specification)
Point of application of the load: 0,2 m from rear of plug body
Before, during (continuous) and after the test
Sampling rate: Measurements shall be made after the load has been maintained at its maximum level for at least 3 s
Clean plug and adaptor according to manufacturer's instructions
Recovery procedure: 5 min recovery period
Table 7 – Mechanical performance requirements (continued)
10 Flexing of the strain relief
≤ 0,20 dB change before and after test
(Initial and final attenuation shall be within specified grade.)
Magnitude of the load: Var 02 to 04:
Point of application of the load: 0,2 m from rear of plug body
Before, during and after test
Sampling rate: Max sampling interval shall be
Pre-conditioning procedure: Clean plug and adaptor according to manufacturer's instructions
Recovery procedure: 5 min recovery period
11 Static side load Attenuation at
(Initial and final attenuation shall be within specified grade.)
Magnitude of the load: Var 02 to 04:
Direction of the load: 2 orthogonal axes 90° to fibre axis
Point of application of the load: 0,2 m from rear of plug
Method of mounting: An adaptor shall be mounted rigidly to the mounting fixture
Duration of load: Var 02* to 06*:
Measurements required: Before, during (continuous) and after the test Sampling rate: 3 min max interval
Pre-conditioning procedure: Clean plug and adaptor according to manufacturer's instructions
Table 7 – Mechanical performance requirements (continued)
(Initial and final attenuation shall be within specified grade.)
Magnitude of the load: 10 N smoothly applied
Point of application of the load: 25 mm from the centreline of the ferrule axis shown in Figure 3
Method of mounting: An adaptor shall be mounted rigidly to the mounting fixture
Before, during (continuous) and after the test
Sampling rate: Measurements shall be made after the load has been maintained at its maximum level for at least 3 s
Pre-conditioning procedure: Clean plug and adaptor according to manufacturer's instructions
13 Gauge retention force (measured on sleeve or adaptor)
Gauge dimensions and characteristics: See Figure 9
Clean gauge and sleeve or adaptor according to manufacturer's instructions.
Environmental performance requirements
(Initial and final attenuation shall be within specified grade.)
Measurements required: Before, during (max interval 1 h) and after the test
Clean plug and adaptor according to manufacturer's instructions Recovery procedure: 2 h at normal ambient conditions
(Initial and final attenuation shall be within specified grade.)
Before, during (max interval 1 h) and after the test
Pre-conditioning procedure: Clean plug and adaptor according to manufacturer's instructions Recovery procedure: 2 h at normal ambient conditions
16 Change of temperature for connectors and patchcords
≤ 0,2 dB change for pigtails /connectors during and after
3 m to 5 m patchcords with both connectors and the cable in the climatic chamber
Cable coil inside the chamber not smaller than
Rate of change of temperature: 1 °C/min Number of cycles: 12
Measurements required: Before, during (max interval
10 min) and after the test
Clean plug and adaptor according to manufacturer's instructions Recovery procedure: 2 h at normal ambient conditions
(Initial and final attenuation shall be within specified grade.)
Dust type: Talc Dust particle size: d < 150 àm Dust concentration: (10,6 ± 7,1) g/m³ Duration of exposure: 10 min
Measurements required: Before and after the test
Preconditioning procedure: Clean plug and adaptor according to manufacturer's instructions Recovery procedure: 2 h at normal ambient conditions
(Initial and final attenuation shall be within specified grade.)
Atmosphere: Salt solution 5 % NaCl, pH 6,5 to 7,2 Temperature: + 35 °C Duration of exposure: 96 h
Before and after the test
Preconditioning procedure: Clean plug and adaptor according to manufacturer's instructions Recovery procedure: 2 h at normal ambient conditions
19 Damp heat (cyclic) Attenuation at
(Initial and final attenuation shall be within specified grade.)
Relative humidity: > 95 % at low temperature and during temperature rise;
> 90 % at high temperature Duration of cycle: 24 h
Measurements required: Before, during (max interval
10 min) and after the test
Clean plug and adaptor according to manufacturer's instructions Recovery procedure: 2 h at normal ambient conditions
Attenuation measurement tests against reference connectors (EN 61300-3-4) are intended to be performed should quality conformance be required When these measurements are required the following test details are valid
Method: EN 61300-3-4:2001, Method B Source type: LED/LD
Source stability: ≤ ± 0,01 dB over the measuring period or at least 1 h
Detector linearity: Within ± 0,01 dB over the dynamic range to be measured
Launch fibre length: > 2 m – Only the fundamental mode shall propagate at the connector interface to be tested and at the detector
Pre-conditioning procedure: Clean plug and adaptor according to manufacturer's instructions
Eccentricity of fibre core centre to ferrule centre ≤0,000 3 mm
Deviation of axis of fibre to axis of ferrule ≤0,2°
Dome Offset of spherically polished ferrule endface ≤ 30 àm
Visual examination of fibre endface with × 200 magnification No defects in core zone
Attenuation between two matched reference plugs in a reference adaptor in all eight measuring positions ≤ 0,03 dB
Adaptor matched reference plug details
Eccentricity of fibre core centre to ferrule centre ≤0,000 3 mm
Deviation of axis of fibre to axis of ferrule ≤ 0,2°
Dome offset of spherically polished ferrule endface ≤30 àm
Visual examination of fibre endface with × 200 magnification No defects in core zone
Attenuation between two matched reference plugs in a reference adaptor in all eight measuring positions ≤
The matched reference plug shall have the same geometrical characteristics as the plug under test and is selected from products meeting the requirements from Annex A
The visual examination shall be repeated every 50 matings
Sample size and product sourcing requirements
No Test Sample size Source
NA Endface geometry all NA New and after all tests are completed
1 Adaptor performance (between matched reference plugs)
3 Return loss (random mate) 10 10 Test 2
7 Strength of coupling mechanism 4 2 Test 15
13 Gauge retention force NA 4 Test 2
16 Change of temperature pigtail patchcord
The above tests are intended to be performed individually in any order on products sourced as defined
Products from previous tests may be used
NOTE This graph is a qualitative representation only
Figure D.1 – Radius vs undercut and apex offset
EN 60794-2 Optical fibre cables – Part 2: Indoor cables – Sectional specification (IEC 60794-2)
EN 60794-2-50 Optical fibre cables – Part 2-50: Indoor cables – Family specification for simplex and duplex cables for use in terminated cable assemblies (IEC 60794-2-50)
EN 61300-3-4:2001 Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 3-4: Examinations and measurements – Attenuation (IEC 61300-3-4:2001)
EN 61300-3-35 Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 3-35: Examinations and measurements – Fibre optic connector endface visual and automated inspection (IEC 61300-3-35)
EN 61754-15 Fibre optic interconnecting devices and passive components – Fibre optic connector interfaces – Part 15: Type LSH connector family (IEC 61754-15)
EN 61755-1 Fibre optic connector optical interfaces – Part 1: Optical interfaces for single mode non-dispersion shifted fibres – General and guidance (IEC 61755-1)
EN 61755-2-2 Fibre optic connector optical interfaces – Part 2-2: Optical interface standard single mode angled physically contacting fibres (IEC 61755-2-2)
EN 61755-3-2 Fibre optic connector optical interfaces – Part 3-2: Optical interface, 2,5 mm and
1,25 mm diameter cylindrical full zirconia ferrules for 8 degrees angled-PC single mode fibres (IEC 61755-3-2)
ETSI TS 100 671 Transmission and Multiplexing (TM); Passive optical components;
Optical fibre connectors for single mode optical fibre communication systems;
Common requirements and conformance testing