IEC 60794-3-10:2009

IEC 60794-3-10
Edition 2.0 2009-01
INTERNATIONAL
STANDARD


Optical fibre cables –
Part 3-10: Outdoor cables – Family specification for duct, directly buried and
lashed aerial optical telecommunication cables


IEC 60794-3-10:2009(E)

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IEC 60794-3-10
Edition 2.0 2009-01
INTERNATIONAL
STANDARD


Optical fibre cables –
Part 3-10: Outdoor cables – Family specification for duct, directly buried and
lashed aerial optical telecommunication cables


INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
U
ICS 33.180.10 ISBN 978-2-88910-293-8
® Registered trademark of the International Electrotechnical Commission

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– 2 – 60794-3-10 © IEC:2009(E)
CONTENTS
FOREWORD.3
1 Scope.5
2 Normative references .5
3 Symbols .6
4 Optical fibre, cable construction and tests applicable for optical telecommunication
cables to be used in ducts, direct buried or lashed aerial applications .7
4.1 Optical fibres.7
4.1.1 Common single-mode fibre requirements.8
4.1.2 Single-mode dispersion unshifted (B1.1) optical fibre .8
4.1.3 Single-mode dispersion unshifted (B1.2) optical fibre .8
4.1.4 Single-mode dispersion unshifted (B1.3) optical fibre .9
4.1.5 Single-mode dispersion shifted (B2) optical fibre .9
4.1.6 Single-mode non-zero dispersion (B4) optical fibre.9
4.1.7 Single-mode non-zero dispersion shifted (B5) optical fibre .9
4.1.8 Single-mode (B6.a) optical fibre.10
4.2 Cable element .10
4.3 Installation and operating conditions .10
4.4 Mechanical and environmental tests.11
4.4.1 Tests applicable .11
4.4.2 Details of family requirements and test conditions for optical fibre
cable tests.12
Annex A (normative) Family specification for optical telecommunication cables to be
used in ducts, directly buried or lashed aerial application.17
Annex B (informative) Lashed aerial applications.23

Table 1 – Common single-mode fibre requirements .8
Table 2 – Single-mode dispersion unshifted (B1.1) optical fibre .8
Table 3 – Single-mode dispersion unshifted (B1.2) optical fibre .8
Table 4 – Single-mode dispersion unshifted (B1.3) optical fibre .9
Table 5 – Single-mode dispersion shifted (B2) optical fibre .9
Table 6 – Single-mode non-zero dispersion (B4) optical fibre.9
Table 7 – Single-mode non-zero dispersion shifted (B5) optical fibre .9
Table 8 – Single-mode (B6.a) optical fibre .10
Table 9 – Cable element .10
Table 10 – Tests applicable .10
Table 11 – Mechanical and environmental applicable tests .11

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60794-3-10 © IEC:2009(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

OPTICAL FIBRE CABLES –

Part 3-10: Outdoor cables –
Family specification for duct, directly buried
and lashed aerial optical telecommunication cables


FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60794-3-10 has been prepared by subcommittee 86A: Fibres and
cables, of IEC technical committee 86: Fibre optics.
This second edition cancels and replaces the first edition published in 2002. It constitutes a
technical revision.
The main changes are listed below:
• the title of the specification has been updated to include lashed applications;
• the fibres specification clause (Clause 4) has been enlarged to include fibre Types B5 and
B6.a;
• an annex has been added for additional requirements according to the MICE table.

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– 4 – 60794-3-10 © IEC:2009(E)
The text of this standard is based on the following documents:
FDIS Report on voting
86A/1245/FDIS 86A/1252/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of IEC 60794 series, published under the general title Optical fibre cables,
can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

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60794-3-10 © IEC:2009(E) – 5 –
OPTICAL FIBRE CABLES –

Part 3-10: Outdoor cables –
Family specification for duct, directly buried
and lashed aerial optical telecommunication cables



1 Scope
This part of IEC 60794 which is a family specification covers optical telecommunication cables
to be used in ducts or direct buried applications. The cable may also be used for lashed aerial
applications. Requirements of the sectional specification IEC 60794-3 for duct, buried and
aerial cables are applicable to cables covered by this standard.
Clause A.2 contains requirements that supersede the normal requirements in case the cables
are intended to be used in installation governed by the MICE table of ISO/IEC 24702.
Annex B gives information on the lashed aerial application.
The parameters specified in this standard may be affected by measurement uncertainty
arising either from measurement errors or calibration errors due to lack of suitable standards.
Acceptance criteria shall be interpreted with respect to this consideration (see IEC 60794-3
Clause 8).
The number of fibres tested shall be representative of the cable design and shall be agreed
between the customer and the supplier.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60304, Standard colours for insulation for low-frequency cables and wires
IEC 60654-4, Operating conditions for industrial-process measurement and control equipment
– Part 4: Corrosive and erosive influences
IEC 60721-1, Classification of environmental conditions – Part 1: Environmental parameters
and their severities
IEC 60721-3-3, Classification of environmental conditions – Part 3-3: Classification of groups
of environmental parameters and their severities – Stationary use at weatherprotected
locations
IEC 60793-1-20, Optical fibres – Part 1-20: Measurement methods and test procedures –
Fibre geometry
IEC 60793-1-40, Optical fibres – Part 1-40: Measurement methods and test procedures –
Attenuation
IEC 60793-1-44, Optical fibres – Part 1-44: Measurement methods and test procedures – Cut-
off wavelength

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– 6 – 60794-3-10 © IEC:2009(E)
IEC 60793-1-48, Optical fibres – Part 1-48: Measurement methods and test procedures –
Polarization mode dispersion
IEC 60793-2-50, Product specifications – Sectional specification for class B single-mode
fibres
IEC 60794-1-1, Optical fibre cables – Part 1: Generic specification – General
IEC 60794-1-2, Optical fibre cables – Part 1-2: Generic specification – Basic optical cable test
procedures
IEC 60794-3, Optical fibre cables – Part 3: Sectional specification – Outdoor cables
IEC 60811-1-1, Common test methods for insulating and sheathing materials of electric
cables and optical cables – Part 1-1: Methods for general application – Measurement of
thickness and overall dimensions – Tests for determining the mechanical properties
IEC 60811-5-1, Insulating and sheathing materials of electric and optic cables – Common test
methods – Part 5-1: Methods specific to filling compounds – Drop-point – Separation of oil –
Lower temperature brittleness – Total acid number – Absence of corrosive components –
Permittivity at 23 °C – DC resistivity at 23 °C and 100 °C
IEC 61000-2-5, Electromagnetic compatibility (EMC) – Part 2: Environment – Section 5:
Classification of electromagnetic environments. Basic EMC publication
IEC 61000-6-2, Electromagnetic compatibility (EMC) – Part 6-2: Generic standards –
Immunity for industrial environments
IEC 61326-1, Electrical equipment for measurement, control and laboratory use – EMC
requirements – Part 1: General requirements
IEC 62363, Radiation protection instrumentation – Portable photon contamination meters and
monitors
ISO/IEC 24702, Information technology – Generic cabling – Industrial premises
3 Symbols
For the purposes of this standard the following symbols apply.
λ Cabled fibre cut-off wavelength.
cc
d Nominal outer diameter of the cable.
DS Detail specification.
T The acceptable amount of long term tensile load which is expected that the cable may
L
experience during operation (i.e. after installation is completed). This load may be due to
residual loading from the installation process and/or environmental effect.
T The acceptable amount of short term tensile load which is expected that the cable experience
M
during installation and/or handling .
T Temperature cycling test temperature limit according to IEC 60794-1-2, Method F1.
A1
T Temperature cycling test temperature limit according to IEC 60794-1-2, Method F1.
A2
T Temperature cycling test temperature limit according to IEC 60794-1-2, Method F1.
B1

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60794-3-10 © IEC:2009(E) – 7 –
T Temperature cycling test temperature limit according to IEC 60794-1-2, Method F1.
B2
t Temperature cycling test dwell time.
1
n × d A value, n, times cable outer diameter, d, used for bends, mandrels, etc.
4 Optical fibre, cable construction and tests applicable for optical
telecommunication cables to be used in ducts, direct buried or lashed aerial
applications
4.1 Optical fibres
Attenuation at the wavelength 1 625 nm is optionally specified by the customer.

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– 8 – 60794-3-10 © IEC:2009(E)
4.1.1 Common single-mode fibre requirements
Table 1 – Common single-mode fibre requirements
Characteristics IEC 60794-3 Family Test methods Remarks
(9) clause/subclause requirements (12) (13)
(10) (11)
Uncabled optical fibre 5.1 IEC 60793-2-50


Attenuation discontinuities 5.2.2 ≤ 0,10 dB IEC 60793-1-40
at 1 310 nm and 1 550 nm
Cabled fibre cut-off 5.3 IEC 60793-1-44
λ < λ
cc
wavelength
operational
Fibre colouring 5.4 IEC 60304 Visual inspection

Polarisation mode

dispersion
5.5 IEC 60794-3 IEC 60793-1-48
PMD

Q
Outer diameter including 8.2.1.1 IEC 60793-2-50 IEC 60793-1-20

colouring
4.1.2 Single-mode dispersion unshifted (B1.1) optical fibre
Table 2 – Single-mode dispersion unshifted (B1.1) optical fibre

Characteristics IEC 60794-3 Family Test methods Remarks
(9) clause/subclause requirements (12) (13)
(10) (11)
Attenuation coefficient 5.2.1 According to DS IEC 60793-1-40
(cabled fibres)
at 1 310 nm 5.2.1 ≤ 0,40 dB/km
at 1 550 nm ≤ 0,30 dB/km
∗
≤ 0,40 dB/km
at 1 625 nm
4.1.3 Single-mode dispersion unshifted (B1.2) optical fibre
Table 3 – Single-mode dispersion unshifted (B1.2) optical fibre 2

Characteristics IEC 60794-3 Family Test methods Remarks
(9) clause/subclause requirements (12) (13)
(10) (11)
Attenuation coefficient 5.2.1 According to DS IEC 60793-1-40
(cabled fibres)
at 1 550 nm 5.2.1 ≤ 0,30 dB/km
∗
≤ 0,40 dB/km
at 1 625 1F nm

—————————
∗
1 625 nm performance is optional depending on agreement between customer and supplier.

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60794-3-10 © IEC:2009(E) – 9 –
4.1.4 Single-mode dispersion unshifted (B1.3) optical fibre
Table 4 – Single-mode dispersion unshifted (B1.3) optical fibre 3H4H

Characteristics IEC 60794-3 Family Test methods Remarks
(9) clause/subclause requirements (12) (13)
(10) (11)
Attenuation coefficient 5.2.1 According to DS IEC 60793-1-40
(cabled fibres)

at 1 310 5.2.1 ≤ 0,40 dB/km

at 1 383 ± 3 nm ≤ 0,40 dB/km
at 1 550
≤ 0,30 dB/km
∗
at 1 625 2F nm
≤ 0,40 dB/km

4.1.5 Single-mode dispersion shifted (B2) optical fibre
Table 5 – Single-mode dispersion shifted (B2) optical fibre

Characteristics IEC 60794-3 Family Test methods Remarks
(9) clause/subclause requirements (12) (13)
(10) (11)
Attenuation coefficient 5.2.1 According to DS IEC 60793-1-40

(cabled fibres)

at 1 550 nm 5.2.1
≤ 0,30 dB/km

4.1.6 Single-mode non-zero dispersion (B4) optical fibre
Table 6 – Single-mode non-zero dispersion (B4) optical fibre

Characteristics IEC 60794-3 Family Test methods Remarks
(9) clause/subclause requirements (12) (13)
(10) (11)
Attenuation coefficient 5.2.1 According to DS IEC 60793-1-40
(cabled fibres)
at 1 550 nm 5.2.1
≤ 0,30 dB/km
*
at 1 625 nm
≤ 0,40 dB/km

4.1.7 Single-mode non-zero dispersion shifted (B5) optical fibre
Table 7 – Single-mode non-zero dispersion shifted (B5) optical fibre

Characteristics IEC 60794-3 Family Test methods Remarks
(9) clause/subclause requirements (12) (13)
(10) (11)
Attenuation coefficient 5.2.1 According to DS IEC 60793-1-40
(cabled fibres)
at 1 460 nm 5.2.1
≤ 0,40 dB/km
at 1 550 nm and
≤ 0,30 dB/km
*
at 1 625 nm
≤ 0,40 dB/km

—————————
∗
 1 625 nm performance is optional depending on agreement between customer and supplier.

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– 10 – 60794-3-10 © IEC:2009(E)
4.1.8 Single-mode (B6.a) optical fibre
Table 8 – Single-mode (B6.a) optical fibre

Characteristics IEC 60794-3 Family Test methods Remarks
(9) clause/subclause requirements (12) (13)
(10) (11)
Attenuation coefficient 5.2.1 According to DS IEC 60793-1-40
(cabled fibres)
at 1 310 nm 5.2.1 NS
at 1 310 nm -1625 nm
≤ 0,40 dB/km
at 1 383 nm
≤ 0,40 dB/km
at 1 550 nm
≤ 0,30 dB/km
*
at 1 625 nm
NS
4.2 Cable element
Table 9 – Cable element

Characteristics IEC 60794-3 Family Test methods Remarks
(9) clause/subclause requirements (12) (13)
(10) (11)
Cable element
Compatibility 6 According to DS Under
consideration
Slotted core 6.3 According to DS Visual
inspection
Tube 6.4 According to DS Visual
inspection
Compound flow and According to DS IEC 60794-1-2,
evaporation Methods E14
and E15
Outer diameter 8.2.1.1 According to DS IEC 60811-1-1
Ribbon 6.5 According to DS Visual
inspection
Filler According to DS
Insulated copper conductor According to DS
Central strength member According to DS
4.3 Installation and operating conditions
Table 10 – Tests applicable

Characteristics IEC 60794-3 Family Test methods Remarks
(9) clause/subclause requirements (12) (13)
(10) (11)
General requirements 8.1 Agreement
between
customer and
supplier
Bend of cable element 8.2.1.2 According to IEC 60794-1-2,
DS Method G1
Tube kinking 8.2.2.1 According to IEC 60794-1-2,
DS Method G7
Ribbons :
- dimensions 8.2.3.1 IEC 60794-3, IEC 60794-3,

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60794-3-10 © IEC:2009(E) – 11 –
Characteristics IEC 60794-3 Family Test methods Remarks
(9) clause/subclause requirements (12) (13)
(10) (11)
Table 1 8.2.3.1
- separability of 8.2.3.2.1 IEC 60794-3, IEC 60794-1-2,
individual fibres from 8.2.3.2.1 Method G5
ribbon or according to or according to DS
DS
- ribbon stripping 8.2.3.2.2 According to
DS
- torsion 8.2.3.2.3 According to IEC 60794-1-2,
DS Method G6

4.4 Mechanical and environmental tests
4.4.1 Tests applicable
Table 11 – Mechanical and environmental applicable tests

Characteristics IEC 60794-3 Family Test methods Remarks
(9) clause/subclause requirements (12) (13)
(10) (11)
Tensile performance 9.1 See 4.4.2.1 and IEC 60794-1-2, See 4.4.2.1
according to DS Methods E1A and
E1B
Installation capability 9.2
(selection from the
following)
- bending under 9.2.1 According to DS IEC 60794-1-2,
tension Method E18
- repeated bending 9.2.2 See 4.4.2.2 IEC 60794-1-2,
Method E6
- impact 9.2.3 See 4.4.2.3 IEC 60794-1-2,
Method E4
- kink 9.2.4 According to DS IEC 60794-1-2,
Method E10
- torsion 9.2.5 See 4.4.2.4 IEC 60794-1-2,
Method E7
Cable bend 9.3 See 4.4.2.5 IEC 60794-1-2,
Method E11
Crush 9.4 According to DS IEC 60794-1-2, See 4.4.2.6
Method E3
Temperature cycling 9.5 According to DS IEC 60794-1-2, See 4.4.2.7
Method F1
Ageing 9.6
- coating adhesion 9.6.1 According to DS IEC 60794-1-2,
stability Method E5
- finished cable 9.6.2 Under
consideration
Water penetration 9.7 According to DS IEC 60794-1-2,
Method F5B
Pneumatic resistance 9.8 According to DS IEC 60794-1-2,
(for unfilled pressurised Method F8
cables)
Special installation
conditions
(selection from the
following as suitable)

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– 12 – 60794-3-10 © IEC:2009(E)
4.4.2 Details of family requirements and test conditions for optical fibre cable tests
NOTE For some of the parameters specified in this standard, the objective is no change in attenuation.
These parameters may be affected by measurement uncertainty arising either from measurement errors or
calibration errors due to a lack of suitable standards. Acceptance criteria should be interpreted with respect to this
consideration. The total uncertainty of measurement for this standard is ≤ 0,05 dB for attenuation or 0,05 dB/km for
attenuation coefficient.
Any measured value within this range, either positive or negative, should be considered as “no change in
attenuation”. The requirement for these parameters is indicated as “No change (≤ 0,05 dB or ≤ 0,05 dB/km)”.
By agreement between customer and supplier, minor deviation from this limit may be accepted at some low
frequency, for example less than 10 %. However, for mechanical tests no deviation in excess of 0,15 dB is
acceptable. For environmental tests, no deviation in excess of 0,10 dB/km is acceptable.
4.4.2.1 Tensile performance
This subclause identifies family requirements and test conditions that are referred to in Table
11.
a) Family requirements
Under long term tensile load (T ) the fibre strain shall not exceed 20 % of the fibre proof strain
L
and there shall be no change in attenuation during the test. Under short term tensile load (T )
M
the fibre strain shall not exceed 60 % of the fibre proof strain and the attenuation change
during test shall be measured and recorded. For aerial cables, the long term tensile load may
be ≥ to the short term tensile load. Other criteria may be agreed between the customer and
the supplier.
Depending on application and cable construction and agreement between customer and
supplier, a maximum tensile force less than the calculation, for example 2 700 N, may be
allowed.
Where T ≥ 9,8 × a × m
M
with m: weight of 1 km of cable,
typical value of a: 1 for direct burial or blowing in duct
1,5 for pulling in duct
Maximum long term tensile load shall be 30 % of short term tensile load.
Under visual examination without magnification, there shall be no damage to the sheath or to
the cable elements.
b) Test conditions
Cable length under tension: not less than 50 m. Taking into account the measurement
accuracy and end effects, shorter lengths may be used by agreement between the customer
and the supplier.
Fibre length: finished cable length.
Tensile load on cable: long term tensile load (T ) and short term tensile load (T ) Other
L M
loads may be applied in accordance with particular user conditions.
Diameter of test pulleys: 1 m but not less than the minimum loaded bending diameter
specified for the cable.

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60794-3-10 © IEC:2009(E) – 13 –
4.4.2.2 Repeated bending
This subclause identifies family requirements and test conditions that are referred to in Table
11.
a) Family requirements
Under visual examination without magnification there shall be no damage to the sheath and to
the cable elements.
b) Test conditions
Bending radius: 20 d.
Load: Adequate to assure uniform contact with the mandrel.
Number of cycles: 25 or different number of cycles may be applied in accordance with
particular user conditions.
Duration of cycle: Approximately 2 s.
4.4.2.3 Impact
This subclause identifies family requirements and test conditions that are referred to in Table
11.
a) Family requirements
Under visual examination without magnification there shall be no damage to the sheath or to
the cable elements. The imprint of the striking surface on the sheath is not considered
mechanical damage.
The variation in attenuation for each fibre shall be ≤ 0,10 dB at 1 550nm after the test. For 1
625 nm applications, performance criteria shall be mutually agreed upon between the
customer and supplier.
b) Test conditions
Striking surface radius: 10 mm or 300 mm.
Impact energy: 3 J with striking surface radius of 10 mm or 10 J with striking
surface radius of 300 mm.
Armoured cable: 10 J with striking surface radius of 10 mm or 20 J to 30 J with
striking surface radius of 300 mm depending on particular user
conditions.
Number of impacts: one in 3 different places spaced not less than 500 mm apart.
4.4.2.4 Torsion
This subclause identifies family requirements and test conditions that are referred to in Table
11.
a) Family requirements

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– 14 – 60794-3-10 © IEC:2009(E)
Under visual examination without magnification there shall be no damage to the sheath or to
the cable elements.
The variation in attenuation for each fibre shall be ≤ 0,10 dB at 1 550 nm after the test. For 1
625 nm applications, performance criteria shall be mutually agreed upon between the
customer and supplier.
There shall be no permanent change in attenuation after the test.
b) Test conditions
Length under test: 2 m.
o
Number of turns: one half turn (through 180 ) over the length of 2 m in each direction.
Number of cycles: 5.
4.4.2.5 Bend
This subclause identifies family requirements and test conditions that are referred to in Table
11.
a) Family requirements
The variation in attenuation for each fibre shall be ≤ 0,10 dB at 1 550 nm. For 1 625 nm
applications, performance criteria shall be mutually agreed upon between the customer and
supplier.
o
This requirement applies at room temperature and, if required, at –30 C.
b) Test conditions
Di
...