DRAFT MALAYSIAN STANDARD. Telecommunication cable: Single-mode optical fibre cable - Loose tube type for aerial installation

Transcription

1 DRAFT MALAYSIAN STANDARD 15E008R0 g STAGE : PUBLIC COMMENT (40.20) DATE : 01/10/ /11/2015 Telecommunication cable: Single-mode optical fibre cable - Loose tube type for aerial installation ICS: Descriptors: telecommunication cable, single-mode optical fibre, loose tube, aerial installation Copyright DEPARTMENT OF STANDARDS MALAYSIA

2

3 CONTENTS Page Committee representation Foreword ii iv 1 Scope 1 2 Normative references 1 3 General 1 4 Construction 2 5 Drumming and packaging 6 6 Tests 7 Table 1 Optical fibre characteristics 10 Table 2 Loose tube colour code 10 Table 3 Fibre colour code 11 Table 4 Physical requirements of steel bearer wire 11 Table 5 Schedule of tests 12 Figure 1 Cross-section of single mode optical fibre 14 Figure 2 Cross-section of completed cable, 4 fibres 14 Figure 3 Arrangement of cores 15 STANDARDS MALAYSIA All rights reserved i

4 Committee representation The Industry Standards Committee on Generation, Transmission and Distribution of Energy (ISC E) under whose authority this Malaysian Standard was developed, comprises representatives from the following organisations: Association of Consulting Engineers Malaysia Atomic Energy Licensing Board Department of Standards Malaysia Federation of Malaysian Manufacturers Jabatan Kerja Raya Malaysia Malaysian Cable Manufacturers Association Malaysian Electrical Appliances and Distributors Association Malaysian Green Technology Corporation Ministry of Domestic Trade, Co-operatives and Consumerism Ministry of International Trade and Industry Persatuan Kontraktor Elektrikal dan Mekanikal Melayu Malaysia SIRIM Berhad (Secretariat) SIRIM QAS International Sdn Bhd Suruhanjaya Komunikasi dan Multimedia Malaysia Suruhanjaya Tenaga Tenaga Nasional Berhad The Electrical and Electronics Association of Malaysia The Institution of Engineers, Malaysia Universiti Malaya Universiti Teknologi Malaysia The Technical Committee on Cables and Cable Accessories which supervised the development of this Malaysian Standard was managed by the Malaysian Cable Manufacturers Association in its capacity as an authorised Standards-Writing Organisation and consists of representatives from the following organisations: Association of Consulting Engineers Malaysia Jabatan Bomba dan Penyelamat Malaysia Jabatan Kerja Raya Malaysia Malaysian Association of Standard Users Malaysian Cable Manufacturers Association (Secretariat) Malaysian Electrical Appliances and Distributors Association Maxis Berhad Petroliam Nasional Berhad SIRIM Berhad SIRIM QAS International Sdn Bhd Suruhanjaya Tenaga Telekom Malaysia Berhad Tenaga Nasional Berhad Universiti Malaya ii STANDARDS MALAYSIA All rights reserved

5 Committee representation (continued) The Working Group on Cables and Cable Accessories which developed this Malaysian Standard consists of representatives from the following organisations: Central Cables Berhad Fajar Cables Sdn Bhd FEC Cables (M) Sdn Bhd Federal Power Sdn Bhd Fujikura Federal Cables Sdn Bhd Leader Cable Industry Berhad Malaysian Cable Manufacturers Association (Secretariat) Master Tec Wire and Cable Sdn Bhd Mega Kabel Sdn Bhd Olympic Cable Company Sdn Bhd Pan-International Wire and Cable (Malaysia) Sdn Bhd Power Cables Malaysia Sdn Bhd Sama Kebel Sdn Bhd Sindutch Cable Manufacturer Sdn Bhd Tai Sin Electric Cables (M) Sdn Bhd Tenaga Cable Industries Sdn Bhd Tonn Cable Sdn Bhd Universal Cable (M) Berhad Universal Cable (Sarawak) Sdn Bhd Utama Cables Sdn Bhd STANDARDS MALAYSIA All rights reserved iii

6 Foreword This Malaysian Standard was developed by the Working Group on Cables and Cable Accessories under the authority of the Industry Standards Committee on Generation, Transmission and Distribution of Energy. Development of this standard was carried out by the Malaysian Cable Manufacturers Association (MCMA) which is the Standards-Writing Organisation (SWO) appointed by SIRIM Berhad to develop standards for Cables and Cable Accessories. Compliance with a Malaysian Standard does not of itself confer immunity from legal obligations. iv STANDARDS MALAYSIA All rights reserved

7 Telecommunication cable: Single-mode optical fibre cable - Loose tube type for aerial installation 1 Scope This Malaysian Standard specifies the construction, test and drumming requirements for single mode optical fibre cable - loose tube type for aerial installation. The cables as prescribed are generally used for digital transmission for SDH hierarchy network including cable TV, both analogue and digital network. 2 Normative references The following normative references are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the normative reference (including any amendments) applies. IEC , Optical fibre cables - Part 1-2: Generic specification, basic optical cable test procedures ASTM D1693, Test for environmental stress-cracking of ethylene plastics ITU-T G 652 D, Characteristics of single-mode optical fibre and cables 3 General The cable shall be loose tube construction comprise single mode fibres of 4 cores, 8 cores, 12 cores, 24 cores, 36 cores, 48 cores and 96 cores. The single-mode fibres shall be designed for use in wavelength regions at nm, nm, nm, and nm. The loose tubes are stranded around the strength member, jelly filled and Polyethylene sheathed, and shall be self-supporting design forming a Figure 8 shape. The Aerial optical fibre cable together with the supporting bearer wires shall be lightweight and properly engineered for overhead construction. The cable shall retain the optical and mechanical properties, detailed in this specification, over the following conditions: a) Temperature : (10 to 60) C; and b) Humidity : (0 to 100) %. STANDARDS MALAYSIA All rights reserved 1

8 4 Construction 4.1 Optical fibre characteristics The optical fibre characteristic dealt in this section shall apply equally to individual fibres, fibres incorporated in a cable and wound onto a drum, and fibres in installed cables. The optical fibre characteristic shall be in accordance with the recommendation of ITU-T G 652 D Fibre materials Each optical fibres shall be made of high-grade silica glass, single mode, matched cladding, step index type in accordance with Table 1, operating with a light source wavelength in the nm or nm region. The substances used in the fibre are Germanium doped silica for the core and Silica glass for the clad Primary coating of fibre Each optical fibre shall be given a primary coating of UV cured acrylate or equivalent material, mechanical strippable. The diameter of the coating, the physical and chemical properties of the material used for the coating and the best way of removing it, if necessary should be indicated Secondary coating of fibre A secondary coating of UV cured acrylate or equivalent material shall be extruded over the primary coated fibre, to reinforce and protect fibres for the cabling process. Special attention must be paid to the surface of materials which are in contact with the fibre since the protection action of the cable structure depends to a large degree on the nature of these surfaces. This jacket shall be sufficiently thick to give a tight protected fibre with outer coating diameter of (245 ± 5) µm. Coating/cladding concentricity shall be less than 12 µm Identification of fibres Each fibre shall be uniquely and easily identified by the use of colour code as detailed in Table 2. Colours of the fibres shall be readily recognisable and have good colour-fast property which will not be affected or eroded by the filling compound Optical and transmission characteristics Mode field diameter The nominal value of the mode field diameter at nm shall range from 8.6 µm to 9.5 µm. The tolerance shall less than 0.6 µm Cladding diameter The nominal cladding diameter shall be 125 µm. The cladding diameter deviation shall not exceed the limit of 1 µm. 2 STANDARDS MALAYSIA All rights reserved

9 Mode field concentricity error The mode field concentricity error shall be less than 0.6 µm Cladding non-circularity The cladding non-circularity shall be less than 1 % Attenuation coefficient The attenuation coefficient of the fibre shall be as follows: a) maximum 0.35 db/km in the nm region and nm region; and b) maximum 0.22 db/km in the 1 550nm region Chromatic dispersion and zero dispersion The maximum magnitude of the Chromatic Dispersion coefficient shall be as follows: a) 3.5 ps/km.nm in the nm wavelength; and b) 18 ps/km.nm in the nm wavelength. The zero Dispersion Slope shall be less than ps/nm 2.km. The zero Dispersion Wavelength shall range from to nm Cutoff wavelength (λ cc ) The cable cut-off wavelength shall be less or equal to nm and it shall be less than the operational wavelength Polarization mode dispersion (PMD) PMD link design value shall be less than 0.2 ps/ km in accordance with Clause 7 of ITU-T recommendation G 652 (10/2000). 4.2 Loose tube Each cable shall contain loose buffer tubes for the suspension of the optical fibres. The maximum number of fibres to be housed in a loose tube shall be 12 fibres The buffer tube shall be made of hydrolytically stable Polybutylene Terephthelate (PBT) resin. The PBT shall be homogeneous, non-toxic, nonhygroscopic, non-nutritive to fungus, electrically non-conductive, and free of dirt and foreign matter Each loose buffer tube shall be distinguishable from other buffer tubes in the cable by means of colour code The colour shall be readily recognisable colour-fast and be compatible with other colour components. STANDARDS MALAYSIA All rights reserved 3

10 4.3 Loose tube filling compound Loose buffer tube filling compound shall be used to prevent water intrusion and migration The compound shall be non-toxic, present no dermal hazards, non-nutritive to fungus, non-hygroscopic and electrically non-conductive The compound shall be free from foreign matter and shall be compatible with all other cable component. The compound shall not have any mineral oil content. 4.4 Cable strength member The material used for the cable central member shall be fibre reinforced plastic or similar material. 4.5 Fillers The make up may incorporate plastic fillers where necessary. 4.6 Stranding Completed loose buffer tubes shall be stranded around a non metallic central strength member in one or two layers S-Z stranding formation shall be employed for the loose tube cable. 4.7 Core wrapping The cable core shall be completely covered with one or more layers of non-hygroscopic and non-wicking dielectric material. The covering shall be lapped or applied longitudinally. 4.8 Swelling tapes Water swelling tapes shall be incorporated in the cable to prevent the ingress of water into the cable, and shall be applied helically and/or longitudinally over the cable core This swelling tape shall be incorporated in the cable, together with the filling compound as stated in Filling The interstices of the cable core shall be completely filled with an approved compound after or during the stranding operation and prior to the application of the core wrapping tape The filling compound shall be homogeneous and uniformly mixed. The compound shall be colourless to facilitate easy fibre identification The filling compound shall be non-toxic and present no dermal hazards. 4 STANDARDS MALAYSIA All rights reserved

11 4.9.4 The filling compound shall not degrade the optical and mechanical properties of the coated fibres in anyway Provision with ripcords One (1) ripcord with minimum breaking load of 150 N shall be laid under the polyethylene sheath Identification A continuous tape, indelibly marked with the following details, shall be laid under the outer wrapping material: Element a) Malaysian Standard number; MS 2133 b) name of manufacturer / trademark / brand; c) type of fibres and number of fibres; d) year of manufacture; e) purchaser s name (if necessary); and f) contract number, if any. Example of marking The markings shall appear at intervals of about 75 mm throughout the length of the cable High-tensile bearer wire Dimension Integral Bearer cable shall contain a high tensile galvanised steel bearer wire complying with Table 4 and covered with low density or medium density, black polyethylene suitable in all respects for use in tropical climates Galvanising The galvanising shall comply in all respects with BS EN for wire of tensile strength 540 MPa and above Ductility Each wire shall be capable of being closely lapped around its own diameter eight times and unlapped without fracture. For stranded wires, this test shall be conducted on individual wires after removal from the strand Drawn galvanised wire If drawn galvanised wire is used, the wire after drawing, shall comply with the galvanising and mechanical stipulations above. STANDARDS MALAYSIA All rights reserved 5

12 Preformed stranded wire All stranded wires shall be preformed so that when cut they do not unravel. The approximate lay length of stranded bearer wire shall be 70 mm Oversheath The cable and the bearer wire shall be sheathed with medium density black polyethylene (MDPE), suitable in all respects for use in tropical climates and shall contain a minimum of 2 % carbon black The nominal radial thickness of black polyethylene sheath shall be 2.0 mm as to provide adequate mechanical protection against impact and crushing while still allowing a maximum bending radius not larger than 20 times the cable outside diameter. The supplier shall ensure that the cable sheath be engineered in such a manner as to minimise the coefficient of friction during hauling of the optical fibre cable, particularly in a partially filled duct The sheath shall be embossed with the name of manufacturer / trademark / brand, purchaser s name ( if applicable ) and the word OPTICAL FIBRE CABLE G652D, fibre count, month/year of manufacture and batch number at intervals of not more than 1 m Length marking The completed cable shall have sequentially numbered length markers at regular intervals of 1 m along the outside of cable sheath in yellow colour. In general, the cable marker shall start at 0 m on the inside end of the cable and where this is not feasible a tag and label shall be attached to outside end of cable and on cable drum respectively, indicating the marking on the inside end. The numbers shall be dimensioned and spaced to produce good legibility and shall be approximately 3 mm in height Stripes When specified, the optical fibre cable shall have two 3.0 mm width coloured stripes (contrast to the sheath colour) marked continuously on the sheath and directly opposite each other. These stripes shall be incorporated during the sheath extrusion process Cross-sectional diagram of the cable The contractor shall provide cross-sectional diagram for each cable size indicating the various elements, which form the complete cable with dimensions, cable mass (kg/km) and its maximum pulling force during installation for each cable size. 5 Drumming and packaging 5.1 The cables shall be delivered in wooden drums. Each drum shall contain one length of cable only. Wooden battens shall be nailed to the circumference of the flanges of drum so as to protect the cable frim damage. 5.2 The barrel diameter of any drum shall not be less than 20 times the finished cable diameter. 5.3 A band approximately 25 mm wide, shall be painted on the cable sheath at each end of 6 STANDARDS MALAYSIA All rights reserved

13 the cable, approximately 75 mm from the end to indicate the direction of rotation of the colour scheme of the multiple unit groups in the cable. The colour of the band shall be RED for clockwise and GREEN for anticlockwise rotation. Alternatively suitable adhesive coloured tape may be used in lieu of paint. 5.4 The ends of the cable shall be sealed by heat shrink capped and sealed immediately to prevent the ingress of moisture before wound onto the wooden drum. A pulling eye shall be installed for ease of installation. 5.5 The spindle hole shall be at least 110 mm in diameter, the spindle plates shall be fitted on all drums with flange diameter mm or more. 6 Tests 6.1 Optical and transmission characteristics of single mode fibres The optical and transmission characteristic shall be in accordance with ITU-T G 652 D Recommendation Optical and transmission characteristics shall be met and measured at room temperature (25 ± 5) C The spectral width of the source used in the nm and nm region shall be 25 nm at half amplitude Optical test and transmission test The optical and transmission characteristics of the single mode fibres shall be in accordance with Mechanical and environmental tests The mechanical and environment test of the cable shall be in accordance with the following clauses and shall be verified by carrying out the test Proof stress test Proof stress shall not be less than 0.69 GPa Dimensions All dimension of the cable shall be checked to conform to the requirement of this specification Tensile strength The tensile strength of the cable shall be in excess of N. Sample length under tension shall be 20 m long. At this load, no residual fibre elongation, no damage to sheath cable element and fibre and the increase in attenuation shall be less than 0.05 db. For test method refer to IEC Method E1. STANDARDS MALAYSIA All rights reserved 7

14 6.2.4 Crush test The crush resistance of the cable shall result in an increase of less than 0.05 db and shall be in excess of N. The cable shall be subjected to the load for 10 min and there shall be no damage to the sheath, cable element and fibre. For test method refer to IEC Method E Bend test The cable shall be unwound and five turns shall be wrapped in a close helix around a mandrel of diameter equal to 20 times the cable diameter. The turns shall be applied at a uniform rate of one revolution in about 5 s and with sufficient tension to ensure that the specimen contours the mandrel. The turns shall be then unwound and the cycle repeated 3 times. Finally, measurements in result in change of attenuation not more than 0.05 db and no damage to the sheath, cable element and fibre. For test method refer to IEC Method E Impact test The optical fibre cable shall be able to withstand impact. The initial impact energy shall be 5 Nm with anvil surface radius of 10 mm or 20 Nm with anvil surface radius of 300 mm, the number of impacts is one in three different places (> 500 mm apart). Final checking shall show no damage to sheath or cable elements. Finally, measurement shall result in change of attenuation not more than 0.05 db. For test method refer to IEC Method E Repeated bending test The optical fibre cable shall be able to withstand repeated bending. The cable shall be bent backwards and forward through 180 degrees thus making a cycle) over a 20 x OD (Outside Diameter) bending radius whilst been subjected to a 100 N tensile load. The cycle shall be repeated 35 times. Finally, there shall be no damage to sheath or cable elements and the change of attenuation shall be less than 0.05 db. For test method refer to IEC Method E Torsion test The purpose of this test is to determine the ability of an optical fibre cable to withstand torsion. A 1 m cable shall be fixed to the rotating clamp, which shall be rotated in a clockwise direction for one turn. The sample shall then be return to the starting position and then rotated in anticlockwise direction for one turn and return to the starting position. This complete movement constitutes one cycle within 1 min maximum and shall be repeated for 5 times. The cable also shall be subjected to 100 N loads. Finally, there shall be no damage to sheath or cable elements and the change of attenuation shall be less than 0.05 db. For test method refer to IEC Method E Temperature cycling test The measuring method applies to optical fibre cables, which are tested by temperature cycling in order to determine the stability behaviour or the attenuation of the cable submitted to the temperature changes. The test shall be performed in two cycles within ambient temperature, -20 C and +70 C. Finally, there shall be no damage to sheath or cable elements and the change of attenuation shall be less than 0.05 db. For test method refer to IEC Method F1. 8 STANDARDS MALAYSIA All rights reserved

15 Water penetration test The purpose of the test is to check that all the interstices of a cable are sufficiently filled to prevent water penetration within the cable. A 25 mm sheath is removed 3 m from one end of the cable sample. The exposed cable core is then placed in 1 m height of water horizontally, containing a sufficient quantity of water soluble fluorescent dye, for 24 hours at the temperature of (25 ± 5) C. No dye shall be detected when end of the 3 m length is examined with ultra violet light. For test method refer to IEC Method F Compound flow test The purpose of this test is to verify that filling and flooding compounds will not flow from a filled fibre cable. A cable sample of 30 cm length with sheath material removed and cable core exposed. Suspend the test samples in an air oven with the flared end of the cable pointing downward. Condition the test samples for a period of 24 h at a temperature of (50 + 5) C. At the end of this test period, there shall be no evidence of dripping of compound from either the core or sheath interfaces. For test method refer to IEC Method E14. STANDARDS MALAYSIA All rights reserved 9

16 Table 1. Optical fibre characteristics Item Characteristics Loose tube and filler Material Type Core Cladding Refractive index profile Single mode optical fibre Germanium doped silica glass Silica glass Step index Mode field diameter (9.2 ± 0.4) 1310 nm Concentricity error 0.8 µm Cladding non-circularity 2% Cable cut-off wavelength Coating Colouring 4 fibres Material 1260 nm UV curable material Diameter (245 ± 5) µm Material UV curable ink Diameter (250 ± 15) µm Table 2. Loose tube colour code 8 fibres 12 fibres 24 fibres 36 fibres 48 fibres 96 fibres 1 Blue Blue Blue Blue Blue Blue Blue 2 Yellow Yellow Yellow Yellow Yellow Yellow Yellow 3 Green Green Green Green Green Green Green 4 Red Red Red Red Red Red Red 5 Filler Violet Violet Violet Violet Violet Violet 6 Filler Brown Brown Brown Brown Brown Brown 7 - Pink Pink 8 - Grey Grey Orange Black White Aqua 10 STANDARDS MALAYSIA All rights reserved

17 Table 3. Fibre colour code Fibre fibres fibres fibres fibres fibres fibres fibres 1 Blue Blue Blue Blue Blue Blue Blue Yellow Yellow Yellow Yellow Yellow Green Green Green Green Red Red Red Red Violet Violet Violet Brown Brown Brown Pink Pink Grey Grey Orange Black White Aqua Cable size Table 4. Physical requirements of steel bearer wire No. of wires and standard wire gauge Erection tension Nominal tensile rating Minimum breaking load Maximum breaking load (kg) (MPa) (kn) (kn) 4 fibres 7/1.6 mm fibres 7/1.6 mm fibres 7/1.6 mm fibres 7/1.6 mm fibres 7/1.6 mm fibres 7/1.6 mm fibres 7/1.6 mm STANDARDS MALAYSIA All rights reserved 11

18 Table 5. Schedule of tests Tests Clauses Category of test* Fibres: Mode field diameter Cladding diameter Core/cladding concentricity error S/T S/T S/T Cladding non-circularity Cable cut-off wavelength Chromatic dispersion Zero dispersion slope Zero dispersion wavelength PMD Attenuation coefficient Proof stress test Tests on complete cables: Colour coding of fibre and loose tube Cable sheath thickness Tensile strength Resistance to water penetration S/T R/S/T T T T T R/S/T S/T R/S/T R/S/T S/T R/S/T Compound flow test Temperature cycling test Torsion test Bend test T S/T S/T T 12 STANDARDS MALAYSIA All rights reserved

19 Table 5. Schedule of tests (concluded) Tests Clauses Category of test* Impact test Repeated bending test Crush test Cable markings and 4.13 T T T R/S/T Breaking load on steel wire * The categories of tests as defined in MS 2133 are as follows: R - Routine test T - Type test S - Sample test STANDARDS MALAYSIA All rights reserved 13

20 Core Cladding Coating Figure 1. Cross-section of single mode optical fibre Figure 2. Cross-section of completed cable, 4 fibres 14 STANDARDS MALAYSIA All rights reserved

21 a) 8-fibres (8-tubes construction) c) 24-fibres (6-tubes construction) d) 36-fibres (6-tubes construction) b) 12-fibres (6-tubes construction) e) 48-fibres (6-tubes construction) f) 96-fibres (8-tubes construction) Figure 3. Arrangement of cores STANDARDS MALAYSIA All rights reserved 15

22 Acknowledgements Members of Technical Committee on Cables and Cable Accessories Mr Lokman Ahmad Dahlan (Chairman) Ms Sara Kong (Secretary) Ir Looi Hip Peu Mr Ahmad Isram Osman Ir Hj Mohd Fazli Osman Ms Anuradha Chelliah Mr V. T. Doshi Malaysian Cable Manufacturers Association Malaysian Cable Manufacturers Association Association of Consulting Engineers Malaysia Jabatan Bomba dan Penyelamat Malaysia Jabatan Kerja Raya Malaysia Malaysian Association of Standard Users Malaysian Electrical Appliances and Distributors Association Maxis Berhad Petroliam Nasional Berhad SIRIM Berhad SIRIM QAS International Sdn Bhd Mr Vimalan Jeyaseelan Mr M. Faudzi M. Yasir Ms Marina Mahdar Mr Mohamad Nazif Zakaria/ Ms Roslinah Abdullah Ir Amir Hassan Suruhanjaya Tenaga Mr Mohamad Anuar Nordin/ Ms Norizan Melan Telekom Malaysia Berhad Mr Ahmad Fared Osman/ Mr Najib Fadhil Mohd Bisri Mr Toh Kim Beng Dr Mohd Rozailan Ibrahim Tenaga Nasional Berhad Universiti Malaya Members of Working Group on Cables and Cable Accessories Mr Lokman Ahmad Dahlan (Chairman) Ms Sara Kong (Secretary) Mr Ahmad Riduan Mr Teh Min Chet/ Mr Goh Seow Chung Mr TH Vong/ Mr Amizar Hashim Mr Mohd Nasir Hashim/ Mr Marzuki Mustapha Ms Cheng Siew Guay Mr Khairul Akmal Ibrahim/ Mr Shmeni Shariff Mr Yong Tat Soon Mr Low Yoon Onn Mr Ng Hien Shui Ms Nor Hanita Abdul Ghani/ Ms Zati Izazi Muhamad Zaki/ Mr Abdul Razak Mohamed Noor Mr Lim Cheng Meng Mr Chen Wee Tong/ Ms Raihana Mohd Harith Power Cables Malaysia Sdn Bhd Malaysian Cable Manufacturers Association Central Cables Sdn Bhd Fajar Cables Sdn Bhd FEC Cables (M) Sdn Bhd Federal Power Sdn Bhd Fujikura Federal Cables Sdn Bhd Leader Cable Industry Berhad Olympic Cable Company Sdn Bhd Sindutch Cable Manufacturer Sdn Bhd Tai Sin Electric Cables (M) Sdn Bhd Tenaga Cable Industries Sdn Bhd Tonn Cable Sdn Bhd Universal Cable (M) Berhad STANDARDS MALAYSIA All rights reserved