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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces YD/T 769-2010 Central tube type of outdoor optical fiber cables for telecommunications.
The following main technical changes have been made with respect to YD/T 769-2010:
——The standard name is modified;
——The codes and structural types of plastic sheaths with parallel reinforcing members are added, and the structural types and related technical contents of metal loose tube are added (see 3.1, 3.2.1, 4.1.2.3.4, 4.1.5.3, Annexes A and B hereof);
——The relevant technical contents of non-metal fibre reinforced-polyethylene bonded sheath structure are deleted, and the contents of grading tensile items of mechanical properties according to core network and access network are deleted (see 3.1, 3.2.1, 4.1.3.3, 4.1.4, 4.1.5.1.1, 4.1.5.4, Annexes A and B, Table 3 of 2010 edition);
——The relevant technical contents of gel-free type are deleted (see 3.2.1, 4.1.2.1, 4.1.2.3. 5, Annexes A and B of 2010 edition);
——The nominal outer diameter of loose tube is modified to 1.8mm~8.0mm, and the tolerance between nominal outer diameter and nominal thickness of loose tube are modified (see 4.1.2.3.4 and Table 9 hereof; 4.1.2.3.3 and Table 8 of 2010 edition);
——The nominal thickness of polyethylene sheath is modified to be 1.6mm, the minimum thickness shall not be less than 1.3mm, and the average thickness on any cross section shall not be less than 1.4mm; the thickness requirements of polyethylene sheath in Type 53 oversheath are added (see 4.1.5.5 hereof; 4.1.5.5 of 2010 edition);
——The structural description of flame retardant optical fibre cable is added, the index of flame retardant polyolefin is modified, and the combustion property requirements of flame retardant optical fibre cable are modified (see 4.1.5.8, 4.4.2.4 and 4.4.4.9 hereof; 4.4.2.4 and 4.4.4.8 of 2010 edition);
——The requirements of peeling strength of metal composite tape are deleted (see 4.4.2.2 of 2010 edition);
——The requirements for the allowable minimum bending radius for optical fibre cables with non-metal reinforcements without oversheath or with Type 04 oversheath are added (see Table 4 hereof);
——The requirements for the limit of restricted substances are modified (see 4.4.5 hereof; 4.4.5 of the 2010 edition);
——The test method for wiping optical fibre cable marks, and the requirements of imprinted markings and spray printed markings are specified respectively (see 5.3.1 hereof; 5.3.1 of 2010 edition);
——The impact cylinder is modified to the impact sphere, and the impact times are modified to be 1 at each of at least 5 times with an interval of 500mm (see 5.5.4 hereof; 5.5.4 of 2010 edition);
——The determination of sheath depression of W-sheathed and P-sheathed optical fibre cable in torsion test (see 5.5.6 hereof);
——The applicable laying modes and special conditions for rat damage are added (see Annex A hereof).
This standard was proposed by and is under the jurisdiction of China Communications Standards Association.
This standard was firstly issued in 1995, firstly revised in 2003, secondly revised on 2010, and this is the second revision.
Central gel-filled loose tube optical fibre cables for outdoor application for telecommunication
1 Scope
This standard specifies the product classification and designation, requirements, test methods, inspection rules, packaging, transportation and storage of central gel-filled loose tube optical fibre cables for outdoor application for telecommunication (hereinafter referred to as “optical fibre cables”).
This standard is applicable to duct, directly buried, tunnel (channel), lashed aerial and other normally laid central gel-filled loose tube optical fibre cables for outdoor application for telecommunication.
This standard is not applicable to micro optical fibre cables and gel-free optical fibre cables laid by air blowing.
2 Normative references
The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 2951.11-2008 Common test methods for insulating and sheathing materials of electric cables and optical cables—Part 11: Methods for general application—Measurement of thickness and overall dimensions—Tests for determining the mechanical properties (IEC 60811-1-1: 2001, IDT)
GB/T 2952 (All parts) Protective coverings for electric cables
GB/T 3280 Cold rolled stainless steel plate, sheet and strip
GB/T 4240 Stainless steel wires
GB/T 6995.2-2008 Markings for electric wires and cables—Part 2: Standard colours
GB/T 7424.2-2008 Optical fibre cable generic specification—Part 2: Basic optical cable test procedures (IEC 60794-1-2: 2003, MOD)
GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 9771 (All parts) Single-mode optical fibres for telecommunication
GB/T 15065 Black polyethylene compounds for wire and cable
GB/T 15972.20 Specifications for optical fibre test methods—Part 20: Measurement methods and test procedures for dimensions—Fiber geometry (GB/T 15972.202008, IEC 60793-1-20: 2001, MOD)
GB/T 15972.21 Specifications for optical fibre test methods—Part 21: Measurement methods and test procedures for dimensions—Coating geometry (GB/T 15972.212008, IEC 60793-1-21: 2001, MOD)
GB/T 15972.22 Specifications for optical fibre test methods—Part 22: Measurement methods and test procedures for dimensions—Length measurement (GB/T 15972.22-2008, IEC 60793-1-22: 2001, MOD)
GB/T 15972.40 Specifications for optical fibre test methods—Part 40: Measurement methods and test procedures for transmission and optical characteristics—Attenuation (GB/T 15972.40-2008, IEC 60793-1-40: 2001, MOD)
GB/T 15972.42 Specifications for optical fibre test methods—Part 42: Measurement methods and test procedures for transmission and optical characteristics—Chromatic dispersion (GB/T 15972.42-2008, IEC 60793-1-42: 2001, MOD)
GB/T 15972.44 Specifications for optical fibre test methods—Part 44: Measurement methods and test procedures for transmission and optical characteristics—Cut-off wavelength (GB/T 15972.44-2008, IEC 60793-1-44: 2001, MOD)
GB/T 15972.45 Specifications for optical fibre test methods—Part 45: Measurement methods and test procedures for transmission and optical characteristics—Mode field diameter (GB/T 15972.45-2008, IEC 60793-1-45: 2001, MOD)
GB/T 15972.48-2016 Specifications for optical fibre test methods—Part 48: Measurement methods and test procedures for transmission and optical characteristics—Polarization mode dispersion (IEC 60793-1-48: 2007, NEQ)
GB/T 17650.2-1998 Test on gases evolved during combustion of materials from cables—Part 2: Determination of degree of acidity of gases by measuring pH and conductivity (IEC 60754-1: 1994, IDT)
GB/T 17651-1998
(All parts) Measurement of smoke density of cables burning under defined conditions (idt IEC 61034: 1997)
GB/T 18380.12-2008 Tests on electric and optical fibre cables under fire conditions—Part 12: Test for vertical flame propagation for a single insulated wire or cable—Procedure for 1kW pre-mixed flame (IEC 60332-1-2: 2004, IDT)
GB/T 24202 Carbon steel wire for optical fiber cable tension members
GB/T 26125-2011 Electrical and electronic products—Determination of six regulated substances (lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, polybrominated diphenyl ethers) (IEC 62321: 2008, IDT)
GB/T 26572 Requirements of concentration limits for certain restricted substances in electrical and electronic products
YD/T 629 (All parts) Monitoring method of attenuation changes in optical fiber transmission
YD/T 723.2-2007 Laminated metal plastic strip for communication cable and optical fibre cable—Part 2: Laminated aluminium plastic strip
YD/T 723.3-2007 Laminated metal plastic strip for communication cable and optical fibre cable—Part 3: Laminated steel plastic strip
YD/T 837.1~837.5-1996 Test method of copper-core, polyolefin insulated, composite aluminum-plastic sheathed cables for urban local communications
YD/T 839.2-2014 Filling compounds and flooding compounds for telecommunication cable and optical fibre cable—Part 2: Filling compounds for optical fibre
YD/T 839.3-2014 Filling compounds and flooding compounds for telecommunication cable and optical fibre cable—Part 3: Filling compounds for cable
YD/T 908-2011 The naming rules for type of optical fibre cables
YD/T 1020 (All parts) Characteristics of termite resistant jacketing materials for electrical cable and optical cable
YD/T 1065.2-2015 Test methods for polarization mode dispersion of single-mode optical fibres—Part 2: Statistical calculation methods of link polarization mode dispersion (PMDQ)
YD/T 1113 Low-smoke halogen-free compounds for telecommunication cable and optical fibre cable
YD/T 1115 (All parts) Waterblocking materials for telecommunication cable and optical fiber cable—Part1: Waterblocking tape
YD/T 118.1 Secondary coating materials used for optical fiber—Part 1: Polybutylene terephthalate
YD/T 1118.2 Secondary coating materials used for optical fiber—Part 2: Modified propyleneresin
YD/T 1118.3 Secondary coating materials used for optical fibre—Part3: Modified polycarbonate
YD/T 1181.1 Characteristics of non-metal reinforcement used for optical cable—Part 1: Glass fiber reinforced plastic rods
YD/T 1181.2 Characteristics of non metal reinforcement for optical fiber cables—Part 2: Aramid yarne
YD/T 1181.3 Characteristics of non-metal reinforcement for optical fiber cables—Part 3: Aramid fiber reinforced plastic rods
YD/T 1181.4 Characteristics of non-metal reinforcement for optical fiber cables—Part 4: Glass fiber yarns
JB/T 8137-1999 (All parts) Delivery drums for wires and cables—Part 1: General specifies
3 Product classification
3.1 General
The optical fibre cable specified in this standard is the central gel-filled loose tube optical fibre cables for outdoor application, and the central tube shall be continuously filled with fibre paste, and the water blocking structure characteristics of optical fibre cable are gel filled. The optical fibre cables have their types, specifications and compilation models classified in accordance with YD/T 908-2011. Where, the following provisions are added to the codes related to sheaths:
W——Steel-plastic bonded sheath with parallel reinforcing member;
P——Plastic sheath with parallel reinforcing member.
Note: P means parallel.
3.2 Types
3.2.1 Basic structure type and name of optical fibre cable
The basic structure type and name of optical fibre cable are as follows:
● GYXTW—Central gel-filled tube steel-polyethylene bonded sheathed optical fibre cable for outdoor application for telecommunication with metal reinforcing member and parallel steel wire;
● GYXTZW—Central gel-filled tube steel-flame retardant polyethylene bonded sheathed optical fibre cable for outdoor application for telecommunication with metal reinforcing member and parallel steel wire;
● GYXTWH—Center gel-filled tube steel-low smoke halogen-free bonded sheathed optical fibre cable for outdoor application for telecommunication with metal reinforcing member and parallel steel wire;
● GYXTW53—Central gel-filled tube steel-polyethylene bonded sheathed, longitudinal corrugated steel tape armored and polyethylene jacketed optical fibre cable for outdoor application for telecommunication with metal reinforcing member and parallel steel wire;
● GYMXTP—Metal central gel-filled tube polyethylene sheathed optical fibre cable for outdoor application for telecommunication with metal reinforcing member and parallel steel wire;
● GYMXTY—Metal center gel-filled tube polyethylene sheathed optical fibre cable for outdoor application for telecommunication with metal reinforcing member;
● GYXTY—Central gel-filled tube polyethylene sheathed optical fibre cable for outdoor application for telecommunication with metal reinforcing member;
● GYXTZY—Central gel-filled tube flame retardant polyethylene sheathed optical fibre cable for outdoor application for telecommunication with metal reinforcing member;
● GYXTH—Center gel-filled tube low smoke halogen-free sheathed optical fibre cable for outdoor application for telecommunication with metal reinforcing member;
● GYFXTY—Central gel-filled tube polyethylene sheathed optical fibre cable for outdoor application for telecommunication with non-metal reinforcing member;
● GYXTS—Central gel-filled tube steel-polyethylene bonded sheathed optical fibre cable for outdoor application for telecommunication with metal reinforcing member;
● GYXTZS—Central gel-filled tube flame retardant polyethylene sheathed optical fibre cable for outdoor application for telecommunication with metal reinforcing member;
● GYXTA—Central gel-filled tube aluminum-polyethylene bonded sheathed optical fibre cable for outdoor application for telecommunication with metal reinforcing member;
● GYXTZA—Central gel-filled tube aluminum-flame retardant polyethylene sheathed optical fibre cable for outdoor application for telecommunication with metal reinforcing member;
3.2.2 Applicable occasions of main types
See Annex A for applicable laying modes and special conditions for main types and derived types of optical fibre cables.
3.3 Specifications
3.3.1 The optical fibres in optical fibre cables shall be of Class B1.1 (dispersion unshifted single-mode optical fibre), Class B1.2 (cut-off wavelength shifted single-mode optical fibre), Class B1.3 (extended wavelength band dispersion unshifted single-mode optical fibre), Class B4 (non-zero dispersion shifted single-mode optical fibre) and Class B6 (bending insensitive single-mode optical fibre) meeting those specified in GB/T 9771, or other applicable classes of single-mode optical fibre as requested by users.
3.3.2 The number of optical fibres in an optical fibre cable should be 2~144, which may also be required by users.
3.4 Product models
The model of optical fibre cable consists of the type and specification code of optical fibre cable, which are separated by a space.
3.5 Product marking
When processing and ordering, the designation of optical fibre cable product shall be marked, which consists of the model of the optical fibre cable and number of this standard.
Example 1: The central gel-filled tube steel-polyethylene bonded sheathed optical fibre cable for outdoor application for telecommunication with metal reinforcing member and parallel steel wire, which includes 24 Class B1.3 single-mode optical fibres, is designated as:
GYXTW 24B1.3 YD/T 769-2018
Example: The metal center gel-filled tube polyethylene sheathed optical fibre cable for outdoor application for telecommunication with metal reinforcing member, which includes 24 Class B1.3 single-mode optical fibres, is designated as:
GYMXTY 24B1.3 YD/T 769-2018
4 Requirements
4.1 Structure
4.1.1 General
4.1.1.1 Optical fibre cables shall consist of optical fibres, central tubes, reinforcing members, water blocking materials and protective layers which include sheath and, where possible, oversheath. Annex B gives some examples of typical optical fibre cable structures. Other structures that meet the mechanical, environmental and transmission performance requirements specified in this standard may also be adopted.
4.1.1.2 The structures of optical fibre cables shall be a full-section water blocking structure, that is, water shall not seep longitudinally in the cable core and protective layer.
4.1.1.3 The optical fibre cables of the same batch, type and specification shall have the same structural arrangement and the same identification chromatogram.
4.1.2 Cable core
4.1.2.1 General
The cable core is a central tube consisting of multi-core communication single-mode fibre or other applicable types of optical fibre as required by the user, and the tube is continuously filled with a thixotropic fibre paste.
4.1.2.2 Optical fibre
4.1.2.2.1 The optical fibre cables should be composed of the same type of coated single-mode optical fibre for communication or other applicable classes of optical fibres required by the user, and the number of cores shall meet the requirements of optical fibre cable specifications. The same lot of optical fibre cables shall use optical fibres manufactured with the same design, materials and processes.
4.1.2.2.2 The surface of optical fibre coating layer shall be provided with full-color code, and its color shall conform to GB/T 6995.2-2008, and shall not fade or migrate. It is allowed to use optical fibre natural color instead of white color.
4.1.2.2.3 The property of single-mode optical fibre used for cabling shall comply with relevant requirements of GB/T 9771.
4.1.2.3 Central tube
4.1.2.3.1 The central tube types include plastic loose tube and metal loose tube, which provide mechanical buffer protection for coated optical fibres.
4.1.2.3.2 The plastic loose tube may be made of polybutylene terephthalate (PBT), polypropylene (PP), polycarbonate (PC) or other applicable plastics, and the properties of PBT, PP and PC shall comply with YD/T 1118.1, YD/T 1118.2 and YD/T 1118.3 respectively; metal loose tube material may be stainless steel strip or other applicable metal materials, and the property of stainless steel strip shall comply with GB/T 3280.
4.1.2.3.3 When the number of optical fibre cores does not exceed 12, the optical fibre in the tube shall be identified by full chromatography, and its color shall be selected according to those specified in Table 1. Under the condition of not affecting the identification, it is allowed to use the natural color of optical fibre instead of the white color. When the number of optical fibres exceeds 12, the optical fibres shall be bundled or color rings shall be added on the surface of the optical fibres to distinguish them. For bundled optical fibres, colored binding yarns shall be used to distinguish whose colors shall be selected from Table 1.
Table 1 Full chromatogram for identification
S.N. 1 2 3 4 5 6 7 8 9 10 11 12
Color Blue Orange Green Brown Grey White Red Black Yellow Purple Pink Turquoise
4.1.2.3.4 Sufficient space between the central tube and the optical fibre shall be provided, and there shall be a certain structural stability between the central tube and the optical cable sheath to avoid the withdrawal of the central tube and ensure the temperature performance of the optical cable. Where:
● The nominal outer diameter of the plastic loose tube should be 1.8 to 8.0mm, the thickness shall increase with the increase of outer diameter, its nominal value should be 0.3 to 1.2mm, and its tolerance shall meet the following requirements:
——When the nominal outer diameter is 1.8mm to 4.0mm (including 4.0mm), the tolerance of nominal outer diameter is ±0.10mm and the tolerance of thickness is ±0.05mm;
——When the nominal outer diameter is 4.0mm to 8.0mm, the tolerance of nominal outer diameter is ±0.20mm and the tolerance of thickness is 0.10mm.
● The nominal outer diameter of the metal loose tube should be 1.5 to 6.0mm, and its tolerance shall be ±0.10mm; the thickness shall increase with the increase of thickness. Its nominal value should be 0.15mm to 0.30mm, and the tolerance should be 0.05mm. In addition, the nominal dimension of loose tube may change with the number of optical fibre cores in the tube, and other nominal dimensions required by the user are allowed.
4.1.2.3.5 The excess length of the optical fibre in the central tube shall be uniform and stable, so that the tensile properties and attenuation temperature characteristics of the optical fibre cables can meet the requirements of this standard.
4.1.2.3.6 The gap in the central tube shall be continuously filled with a thixotropic fibre paste. The fibre paste shall be compatible with other optical fibre cable materials in contact with it, and will not damage the transmission characteristics and service life of the optical fibre. The fibre paste shall comply with the requirements of YD/T 839.2-2014, and the fibre paste used for metal loose tubes shall be hydrogen-absorbing fibre paste.
4.1.3 Reinforcing members
4.1.3.1 The reinforcing member shall be in the sheath or outside the central pipe in the sheath, which can either be metal or non-metal. These reinforcing members shall have enough cross section, Young's modulus and elastic strain range to make the tensile properties and attenuation temperature characteristics of optical fibre cables conform to the requirements of this standard.
4.1.3.2 The high-strength single round steel wire shall be used for metal reinforcing members, and phosphatized steel wire or stainless steel wire should be used for high-strength steel wire. When the central tube is a metal loose tube, galvanized steel wire can also be used. The surface of steel wire shall be round and smooth. The Young's modulus of phosphatized steel wire and galvanized steel wire shall be not less than 190GPa, and other properties shall meet the requirements of GB/T 24202. The stainless steel wire shall meet the requirements of GB/T 4240; Single round steel wire shall not have any splice within the manufacturing length of optical fibre cable.
4.1.3.3 The non-metal fibre reinforced plastic rods should be used for non-metal reinforcing members, including glass fibre reinforced plastic (GFRP) rods, kevlar fibre reinforced plastic (KFRP) rods and basalt fibre reinforced plastic (BFRP) rods. The GFRP property shall meet the requirements of YD/T 1181.1, the KFRP property shall meet the requirements of YD/T 1181.3, and the BFRP property shall meet the requirements of YD/T 1181.5. Other appropriate non-metal reinforcing members may be used, such as kevlar yarn, glass fibre yarn or non-metal fibre reinforced plastic tape. The kevlar yarn shall meet the requirements of YD/T 1181.2 and the glass fibre yarn shall meet the requirements of YD/T 1181.4. GFRP, KFRP, BFRP and non-metal fibre reinforced plastic tape cannot be spliced within the manufacturing length of optical fibre cable, and each bundle of kevlar yarns or glass fibre yarn is allowed to have one splice, but only one splice is allowed to be used within any 200m optical fibre cable length.
Foreword i
1 Scope
2 Normative references
3 Product classification
3.1 General
3.2 Types
3.3 Specifications
3.4 Product models
3.5 Product marking
4 Requirements
4.1 Structure
4.2 Length
4.3 Marking
4.4 Performance requirements
5 Test methods
5.1 General
5.2 Inspection of optical fibre cable structure
5.3 Inspection of optical fibre cable markings
5.4 Inspection of optical fibre cable length
5.5 Mechanical properties test on optical fibre cables
5.6 Environmental properties test on optical fibre cables
6 Inspection rules
6.1 General provisions
6.2 Terms of inspection
6.3 End-of-manufacturing inspection
6.4 Type inspection
7 Packaging, transportation and storage
7.1 Packaging
7.2 Transportation and storage
8 Instructions for use
Annex A (informative) Applicable laying modes and special conditions for main types
Annex B (informative) optical fibre cable cross sections of several typical central tube structures
Annex C (normative) Characteristic requirements of single-mode optical fibre in optical fibre cable
