GB/T 18480-2001 English PDF (GBT18480-2001)

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GB/T 18480-2001: Specification for submarine optical fiber cables
GB/T 18480-2001
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 33.080.10
M 33
Specification for submarine optical fiber cables
ISSUED ON: SEPTEMBER 28, 2001
IMPLEMENTED ON: MAY 01, 2002
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Definition ... 5 
4 Requirements ... 6 
5 Inspection method ... 13 
6 Inspection rules ... 17 
7 Sealing, marking, transportation, storage ... 20 
Appendix A (Normative) Test method for tensile load of submarine optical fiber
cable ... 21 
Appendix B (Normative) Test method for watertightness of submarine optical
fiber cable ... 24 
Appendix C (Informative) Submarine optical fiber cable structure ... 26 
Specification for submarine optical fiber cables
1 Scope
This Specification specifies the product classification, materials, manufacturing
length, technical requirements, inspection methods, inspection rules,
requirements for sealing, marking, transportation, storage of submarine optical
fiber cables.
This specification applies to the manufacture and use of submarine optical fiber
cables. For underwater optical fiber cables across rivers and lakes, it may also
refer to this Specification.
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. The versions indicated at the time of
publication of this standard are valid. All standards are subjected to revision,
AND parties who reach an agreement based on this Standard are encouraged
to study if the latest versions of these documents are applicable.
GB/T 2828-1987 Sampling procedures and tables for lot-by-lot inspection by
attributes (Apply to inspection of successive lots or batches)
GB/T 2829-1987 Sampling procedures and tables for periodic inspection by
attributes (Apply to inspection of stability for productive process)
GB/T 2952.1-1989 Protective coverings for electric cables - Part 1: General
GB/T 3048.4-1994 Test methods for determining electrical properties of
electric cables and wires - Measurement of D.C. resistance of conductors
(neq IEC 885-2)
GB/T 3048.6-1994 Test methods for determining electrical properties of
electric cables and wires - Determining insulation resistance - Voltmeter-
ammeter method (neq IEC 885-2)
GB/T 3048.14-1992 Electric cables and wires - Method for D.C. voltage test
(neq IEC 60.1 ~ 60.4:1973)
GB/T 3206-1982 Carbon constructional quality steel wires
GB/T 4239-1991 Cold rolled stainless steel and heat resisting steel strips
wire.
3.1.5 Double armored optical fiber cables
Optical fiber cable, which is protected by double-layer armored steel wire.
3.2 Symbols and abbreviations
This specification uses the following symbols and abbreviations.
DK - Single armored;
SK - Double armored.
4 Requirements
4.1 Detailed specifications
The requirements of submarine optical fiber cables shall comply with the
provisions of this Specification and the corresponding detailed specification.
When the requirements of this Specification conflict with the requirements of
the detailed specification, the detailed specification shall prevail.
4.2 Classification
Submarine optical fiber cables, that contain optical fiber cables AND may
contain electrical conductors, include the following types:
a) According to its applicable water depth and marine environment, it can be
divided into two categories: deep water optical fiber cables AND shallow
water optical fiber cables;
b) According to its different protection levels, it can be divided into single-
layer armored, double-layer armored, non-armored optical fiber cables;
c) According to the different structural characteristics of its products, it can
be divided into skeleton type, central tube type, loose tube stranded
optical fiber cable;
d) According to the relay mode, it can be divided into: submarine optical fiber
cable with relay AND submarine optical fiber cable without relay.
4.3 Materials
Submarine optical fiber cables shall use materials, which are specified in this
Specification. For materials not specifically specified in this Specification, the
manufacturer shall use materials, that meet the performance requirements of
It shall use the low-density polyethylene materials or equivalent materials, that
meet the requirements of PE-M-13D022 in GB 11115.
4.3.8 Outer sheath
It shall use the high-density polyethylene materials or equivalent materials, that
meet the GH requirements in GB 15065.
4.3.9 Electrical conductor (when required)
The quality of the electrical conductor shall be uniform and free of defects. Its
electrical performance shall meet the requirements of the relevant product
specifications.
4.4 Structure
4.4.1 Overview
The submarine optical fiber cable shall be composed of a cable core, an inner
sheath, an outer sheath. The submarine optical fiber cable shall have a circular
cross-section and a concentric geometric structure. The design of the
submarine optical fiber cable shall meet the requirements of 4.1.
See Appendix C (informative) for several typical cross-sectional schematic
diagrams of submarine optical fiber cable structures.
4.4.2 Cable core
The cable core usually includes optical fibers, loose tubes, reinforcements,
metal sealing tubes, water blocking tapes, inner sheaths, as well as possibly
auxiliary components such as yarn ties.
4.4.2.1 Number of optical fibers
The number of optical fibers, in the loose tube, shall be 4 ~ 12 cores; the
maximum is 48 cores.
4.4.2.2 Optical fiber's color code
For easy identification, the surface of each optical fiber's coating layer shall be
colored OR use colored ring. The color code shall be marked, according to the
color, which is specified in GB 6995.2, as shown in Table 1. For optical fibers,
which have more than 12 cores in a single tube, it shall use a color ring or
equivalent method, for distinction.
cause the sheath to penetrate; the optical fiber shall have no residual additional
attenuation.
4.5.3.6 Repeated bending
After the submarine optical fiber cable is tested according to 5.4.2, the sheath
shall be free of cracks or fractures; the optical fiber shall have no residual
additional attenuation.
4.5.4 Environmental performance
The environmental performance of submarine optical fiber cables shall include
temperature cycling, watertightness, sheath integrity.
4.5.4.1 Temperature cycle
The submarine optical fiber cable adopts stainless steel loose tube, for
temperature cycling test. After keeping the temperature for 4 h AND 2 cycles,
the additional attenuation of the optical fiber, after the test, shall not be greater
than 0.05 dB/km.
4.5.4.2 Watertightness
The watertightness performance of the deep water optical fiber cable shall meet
the requirements of 4.1;
After the shallow water optical fiber cable is placed at 2 MPa water pressure,
for 336 h, the longitudinal water seepage length of the cable core shall not be
greater than 200 m.
4.5.4.3 Sheath integrity
The polyethylene sheath shall be continuous and complete. When there is a
metal moisture barrier or armor layer under it, it shall adopt the electrical method,
to carry out the integrity test of the polyethylene sheath.
The integrity of the submarine optical fiber cable is checked by a water
...