LOOSE TUBE OPTICAL FIBER CABLE
Short Description:
OPTICAL FIBER CABLE TECHNICAL STANDARD
PRODUCT DESCRIPTION
OPTICAL FIBER CABLE TECHNICAL STANDARD
General Introduction
  • This standard covers general requirements for loose tube optical fiber cables with fiber counts from 1 to 4 fibers manufactured by RECOIN Telecommunication Electronics Joint Stock Company.
  • RECOIN Joint Stock Company's loose tube optical fiber cables fully comply with the technical requirements of ITU-T G.652D; ITU-T G.657.A1 standards, as well as the specifications of IEC, EIA, and TCVN 8696:2011.
  • The fibers used in the cable are single-mode optical fibers, fully compliant with ITU-T G.657.A1; ITU-T G.652.D recommendations and TCVN 8696:2011.
  • All optical fibers, fiber coatings, buffer tubes, non-conductive filling compounds, jackets, strength members, and hanging wires are continuous, without splices, uniformly of high quality, and free from other defects.
CABLE SYMBOL
1-fiber loose tube cable (G.657.A1 fiber type), Symbol: FTTx-LT-F8G.657.A1-1FO

2-fiber loose tube cable (G.657.A1 fiber type), Symbol: FTTx-LT-F8G.657.A1-2FO

4-fiber loose tube cable (G.657.A1 fiber type), Symbol: FTTx-LT-F8G.657.A1-4FO

1-fiber loose tube cable (G.652.D fiber type), Symbol: FTTx-LT-F8G.652.D-1FO

2-fiber loose tube cable (G.652.D fiber type), Symbol: FTTx-LT-F8G.652.D-2FO

4-fiber loose tube cable (G.652.D fiber type), Symbol: FTTx-LT-F8G.652.D-4FO
Number of Optical FibersAverage Diameter of Subscriber Cable
(mm)		Minimum Bending Radius, (mm)
During InstallationAfter Installation
1/2/44,0 ± 0,210D20D
OD: Outer diameter of cable
TTName Description
1Number of colored optical fibers1FO/2FO/4FO
2Liquid tubeMaterial Polybutylene terephthalate (PBT)
Outer diameter ≥ 1.8 mm
Inner diameter 1.2 mm ± 0.1mm
Filling compound Thixotrophic Jelly Compound
3Suspension wireSteel wire 7 zinc-coated steel strands ( Ф ≥ Ø 0.33mm x 7 strands)
Cable neck size ≥ 0.5×0.5 (mm)
Coating layer PE plastic, thickness ≥ 0.5 mm
4Outer sheathMaterial PE plastic
Average thickness 1.0 mm ± 0.1mm
Reinforcement component Aramid Yarn
Cable Jacket and Reinforcement
  • The outer jacket is made of high-quality PE material, not recycled plastic, containing carbon for UV resistance, suitable antioxidant for oxidative resistance, non-fungal growth, and insulating ability.
  • The cable jacket protects the cable core from mechanical impacts and environmental influences during storage, installation, and operation (water, temperature, chemicals, insect damage, etc.).
  • The cable jacket is smooth, concentric, without joints, cracks, holes; uniformly of high quality (no roughness, bubbles, delamination, cracks, swelling, defects); metal-free; flexible, robust, and easy to strip.
  • The PE jacket tightly hugs the buffer tubes and can be easily separated from the tube elements without affecting the fiber cable quality.
  • Separating the hanging wire from the cable core does not alter the cable core structure or affect the fiber quality.
Fiber Color Coding
Fiber color code follows TIA/EIA-598-A standard as shown in the table below
Number of Optical FibersColor of Optical Fibers
1NA (any color)
2Next color of fiber 1 in the color code table
3Next color of fiber 2 in the color code table
4Next color of fiber 3 in the color code table
Optical Fiber Specifications
Optical and geometric characteristics of single-mode optical fiber according to ITU-T G.652.D and TCVN 8696:2011 recommendations.
Parameter Unit Target Method
Attenuation CoefficientdB/km≤ 0.3 at 1550nmIEC 60793-1-40
≤ 0.4 at 1310nm 1625nm
Dispersion Coefficientps/nm.km≤ 3.5 at 1310nm ≤ 18 at 1550nmIEC 60793-1-42
PMD Coefficientps/km¹/²≤ 0.2IEC 60793-1-42
Zero Dispersion Wavelengthnm1300 ≤ λ₀ ≤ 1324IEC 60793-1-42
Dispersion Slopeps/nm².km≤ 0.092IEC 60793-1-40
Cut-off Wavelengthnmλcc ≤ 1260IEC 60793-1-44
Bending Loss r (radius) = 30mm x 100 turnsdB≤ 0.1 at 1625nmIEC 60793-1-47
Mode Field Diameterμm9.2 ± 0.4 at 1310nmIEC 60793-1-45
Mode Field Eccentricityμm≤ 0.5IEC 60793-1-20
Cladding Diameterμm125 ± 0.7IEC 60793-1-20
Cladding Non-Circularity%≤ 0.7IEC 60793-1-20
Coating Diameterμm245 ± 10 (uncolored) 250 ± 10 (colored)IEC 60793-1-21
Splice Loss IncreasedB0.1IEC 60793-1-40
Fiber Tensile StrengthGpa≥ 0.69IEC 60793-1-30
Optical and geometric characteristics of single-mode optical fiber according to ITU-T G.657.A1 and TCVN 8696:2011 recommendations.
Specification Unit TargetsMethod
Attenuation CoefficientdB/km≤ 0.3 at 1550nm≤ 0.3 at 1490nmIEC 60793-1-40
Dispersion Coefficientps/nm.km≤ 3.5 at 1285nm to 1330nm≤ 18 at 1550nmIEC 60793-1-42
PMD Coefficientps/km¹/²≤ 0.2IEC 60793-1-42
Zero Dispersion Wavelengthnm1300 ≤ λ₀ ≤ 1324IEC 60793-1-42
Dispersion Slopeps/nm².km≤ 0.092IEC 60793-1-40
Cut-off Wavelengthnmλcc ≤ 1260IEC 60793-1-44
Bending LossdB≤ 0.25 at 1550nm≤ 0.1 at 1625nmIEC 60793-1-47
Mode Field Diameterμm8.6 ± 0.4 at 1310nmIEC 60793-1-45
Mode Field Eccentricityμm≤ 0.5IEC 60793-1-20
Cladding Diameterμm125 ± 0.7IEC 60793-1-20
Cladding Non-Circularity%≤ 1.0IEC 60793-1-20
Coating Diameterμm245 ± 5IEC 60793-1-21
Splice Loss IncreasedB0.1IEC 60793-1-40
Fiber Tensile StrengthGpa≥ 0.69IEC 60793-1-30
Primary Coating LayerMaterial resistant to ultraviolet radiation (acrylate), minimizing environmental impact.
Before coloring, the nominal diameter is 245 μm ± 10 μm, after coloring, the nominal diameter is 250 μm ± 10 μm using time-resistant ink.
When splicing, the primary coating layer should be easily removable from the fiber without the need for chemicals and without affecting the fiber.
Physical, Mechanical, and Environmental Properties of Cable
noTEST TEST METHODS AND STANDARDSSTANDARDRESULT
1Tensile StrengthIEC 60794-1-2-E1Drum diameter: ≥ 30D (D= cable diameter) Continuous load test: 500N for 5 minutes.No cable sheath breakage, no fiber breakage, anoenuation increase: ≤ 0.2dB (at wavelengths 1310nm,1490nm,1550nm), wire elongation not exceeding 0.25%
2Compression ResistanceIEC 60794-1-2-E3Test force: 100N/1cm for 1 minute and 50N/1cm for 10 minutes Number of test points: 1No cable sheath breakage, no fiber breakage, anoenuation increase: ≤ 0.2 dB (at wavelengths 1310nm,1490nm,1550nm).
3Impact ResistanceIEC 60794-1-2-E4Hammer height: 100cm; Hammer weight: 0.3kg; Hammer head diameter: 25 mm Number of test points: 25 points (spaced 10cm apart)No cable sheath breakage, no fiber breakage, anoenuation increase: ≤ 0.2 dB (at wavelengths 1310nm,1490nm,1550nm).
4Bending ResistanceIEC 60794-1-2-E6Bending axis diameter: ≥ 20D (D = Cable diameter) Bending angle: ± 90°; Number of cycles: 25 cyclesNo cable sheath breakage, no fiber breakage, anoenuation increase: ≤ 0.2 dB (at wavelengths 1310nm,1490nm,1550nm).
5Twist ResistanceIEC 60794-1-2-E7Twist test length: ≤ 2m; Number of cycles: 10 cycles Twist angle: ± 180°; Axial load 40NNo cable sheath breakage, no fiber breakage, no sheath cracking when viewed through a magnifying glass up to 5 times
6Heat ResistanceIEC 60794-1-2-F1Thermal cycle: 23°C ® -30°C ® +60°C ® 23°C Time at each cycle: 24 hoursAnoenuation increase: ≤ 0.2dB/km (at wavelengths 1310nm, 1490nm, 1550nm).
7Flow Test of Filling CompoundIEC 60794-1-2-E14Test sample length: 0.3m, one end stripped of cable sheath approximately 80mm and hung upside down in the test chamber Test duration: 24h; Test temperature 60°CThe filling compound in the test sample does not flow down; The optical fibers in the loose tube remain in place without falling.
8Water Penetration ResistanceIEC 60794-1-2-F5Test sample length: 3m; Water column height: 1m Test duration: 24 hoursNo water penetration through the test sample
Physical, Mechanical, and Environmental Properties of Cable
  • Maximum tensile force during cable construction (short-term) must be at least 500N.
  • Permissible tensile force during use is greater than 30% of the maximum tensile force during construction.
Specifications Specifications
Maximum allowable load during installation500N
Maximum allowable load during operation400N
Compression resistance≥ 500N/10cm
Temperature range during installation-5°C ~ 65°C
Temperature range during operation-10°C ~ 65°C
Minimum allowable bending radius during installation10 times the cable diameter
Minimum allowable bending radius after installation20 times the cable diameter
Maximum continuous cable length during installation2000m
Maximum continuous cable length during operation2000m
Span and Sag
  • With a span of ≤ 50m and a sag of 1%.
Packaging and Marking
a. Cable marking and length
  • Cable information is marked at each meter length according to IEEE P1222 standard. Additional information can be added as per customer requirements.
Packaging
  • Average length of cable: 3000m
  • Cable is wound on wooden cable drums (with a length of 3000m).
  • After testing, both ends of the cable reel are tightly wrapped to prevent water ingress.
  • The cable drum face is marked with the following information.
  • Manufacturer's Name: RECOIN
  • Cable Type: FTTx-LT-F8 Loose Tube Cable
  • Fiber Count: 1F0/2F0/4F0
  • Customer's Name: VNPT
  • Cable Length: 3000m
  • Manufacture Date: ..............
  • Test Date: ..............
  • Cable Weight: ............kg
  • Total Drum Weight: ...........kg
  • Arrow pointing out cable direction
  • Quality Control Check Mark at Factory Exit
    • Other Characteristics
    • Cable jacket ensures solid protection for cable core (buffer tubes), hanging wire steel twist in installation operation.
    • No protruding steel wire core, cable core when stripping/cutting the hanging wire.
    • Cable service life >= 10 years
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