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Optical Cable Suspension

Short description:

PRODUCT DESCRIPTION

TECHNICAL STANDARDS FOR OPTICAL CABLES

General introduction

This standard includes general optical and structural requirements for suspended optical cables containing 48 and 96 optical fibers manufactured by Recoin Electronics Telecommunications Joint Stock Company.
The optical fiber used is single mode - step refractive index and is made of high quality glass material according to recommendations ITU-T G.652.D and TCVN 8665: 2011
Cable lifespan: ≥ 15 years
Cable types and cable symbols

Wire symbol:

Figure 8 metal-sheathed fiber optic cable 96FO, Symbol: TKL1 – LT8 – 96FO
Figure 8 metal-sheathed hanging fiber optic cable 48FO, Symbol: TKL1 – LT4 – 48FO
Figure 8 non-metallic sheathed fiber optic cable, Symbol: TPKL1 – LT8 – 96FO
Figure 8 non-metallic sheathed fiber optic cable, Symbol: TPKL1 – LT4 – 48FO

2.1.Cable structure

Cross section of cable

Structure description

Tên		Describe
Number of optical fibers		48FO/96FO
Number of optical fibers in 1 loose tube		12FO
Loose Pipe - Materials		PBT (Polybutylene terephthalate)
Loose tube - Outside diameter		≥ 2.0 mm, always round and even
Liquid tube filling compound		Thixotrophic Jelly
Filler tube (if any) - Materials		PE plastic (or equivalent), no recycled plastic used, same size as loose tube, no defects
Central reinforcement component - Materials		FRP (Fiberglass Reinforce with Palstic)
Central reinforcement member - Diameter		≥ 2,0 mm
Waterproof ingredients - Waterproof fibers		Water Blocking Yarn
Waterproof component - Waterproof tape and creates an even roundness for the cable core		Water Blocking Tape
Core braiding method		SZ reversible braid.
Rip cord (Ripcord)		Made of Aramid fibers that are tightly tied together to easily distinguish from other components and ensure it is strong enough to strip the cable sheath. Located under corrugated steel tape for metal cables.
Mechanical protection for metal cables		Corrugated steel tape, ripple height 0.5mm.
Fiber redundancy		Minimum 1% of the cable length at a temperature range of 20°C to 30°C
Outer shell - Materials		Black HDPE plastic
Outer shell - Thickness		2,0 mm ± 0,1mm
Cable hanging wire - Galvanized steel wire		Consists of ≥ 7 galvanized steel strands braided together with diameters:\n- 48FO cable, diameter of each strand ≥ 1.0mm;\n- 96FO cable, diameter of each strand ≥ 1.2mm;
Cable slings - Size and cover of slings		Made of seamless HDPE plastic with cable cover, thickness and size:\n- Sheath thickness: ≥ 1.0mm;\n- Hanging neck height: 2.3mm ± 0.3mm\n- Neck width hanging wire: 2.3mm ± 0.3mm

1. Cable cover and reinforcement

The outer shell is made from 100% new high-quality HDPE material, contains black carbon that can withstand the impact of ultraviolet rays, contains antioxidants, is not capable of growing mold on the shell and has electrical insulating properties. Do not use recycled plastic.

The cable cover protects the cable core from mechanical impacts and external environmental influences during storage, installation and exploitation (water, temperature, chemicals, rodents...).

The cable sheath is guaranteed to be smooth, concentric, without joints, cracks, or holes; Uniform quality (no: rough, porous, contains air bubbles, splits, has blisters, defects, lumps), does not contain metal components, is flexible, sturdy, peels easily , do not stick too tightly to the cable core, causing the loose buffer tube to dent when separating the shell.

Able to withstand high voltage: Minimum 20 kVDC or 10kVACrms with frequency from 50Hz to 60Hz; There is no phenomenon of ignition or cable sheath puncture after 5 minutes of testing.

For metal cables. The corrugated steel tape ensures cable protection against mechanical impacts and is rodent-proof; Using low carbon steel electroplated with chrome with a thickness after corrugated stamping ≥ 0.15mm, and coated with ethylene arcylic copolymer on both sides, coating thickness ≥ 0.04mm. Corrugated steel tape wraps along the entire SZ braided cable core with the overlap of the steel tape being at least 3mm. The outer diameter of the steel tape overlapping part is equal to the outer diameter of the corrugated part.

The cable slings are made of galvanized steel, twisted and covered with HDPE plastic in one piece with the cable sheath. When separating the hanging wire from the cable body, it does not change the cable body structure and affect the cable quality

2. Specify the number and color of liquid tubes and the quantity of loose tubes and filler tubes

1. The color coding of optical fibers and loose tubes complies with TIA/EIA -598-A standard

1.The number, color of liquid tubes, and quantity of loose tubes and filler tubes comply with the provisions in the following table:

Loose tube	Cable core element (loose tube/filled tube)
	TT	1	2	3	4	5	6	7	8
		Blue	Orange	Green	Brown	Grey	White	Red	Black


	Cable core element (loose tube/filled tube)
	TT	1	2	3	4	5	6	7	8

Number of optical fibers	48FO	12	12	12	12	Padded	Padded

	Cable core element (loose tube/filled tube)
	TT	1	2	3	4	5	6	7	8


96FO	12	12	12	12	12	12	12	12

3. Specifications of optical fiber

Optical and geometrical properties of single-mode optical fiber according to ITU-T G.652.D recommendations, coated with UV Cured crylate layer that is resistant to ultraviolet rays and meets the following specifications:

TT	Target name	Standard	Measurement methods
1	Fiber Attenuation Coefficient (Attenuation Coefficent)	≤ 0.35 dB/km\n≤ 0.36 dB/km\n≤ 0.21 dB/km\n≤ 0.22 dB/km	IEC 60793-1-40
2	Dispersion coefficient	≤ 3,5 ps/nm×km ≤ 18 ps/nm×km	IEC 60793-1-42
3	Polarization Mode Dispersion (PMD)	≤ 0,2 ps/	IEC 60793-1-48
4	Wavelength with zero dispersion (λ₀min – λ₀max)	1300nm ≤ λ₀ ≤ 1324nm	IEC 60793-1-42
5	Zere dispersion slope – S₀max	≤ 0,092 ps/nm²×km	IEC 60793-1-40
6	Cut–off wavelength λcc (Cut–off wavelength)	≤ 1260nm	IEC 60793-1-44
7	Loss when bending optical fiber at wavelength 1625nm (Marcro bending loss) with radius r = 30mm × 100 turns	≤ 0,1 dB	IEC 60793-1-47
8	MFD (Mode Field Diameter) mode field diameter at wavelength 1310nm	9,2µm ± 0,5µm	IEC 60793-1-45
9	Core concentricity error	≤ 0,6µm	IEC 60793-1-20
10	Cladding diameter	125µm ± 1,0µm	IEC 60793-1-20
11	Cladding noncircularity	≤ 1 %	IEC 60793-1-20
12	Primary coating diameter	245µm ± 10µm 250µm ± 10µm	IEC 60793-1-21
13	Point Discontinuity increases dramatically at wavelengths 1310nm and 1550nm (Point Discontinuity)	≤ 0,05dB	IEC 60793-1-40
14	Fiber tension	≥ 0,69Gpa (100kpsi)	IEC 60793-1-30
15	Fiber color code	Theo EIA/TIA-598
16	The primary shell uses a material that resists the effects of ultraviolet rays (acrylate), minimizing the impact of the external environment.
17	The primary shell before dyeing has a nominal diameter of 245µm ± 10µm, after dyeing it has a nominal diameter of 250µm ± 10µm using a durable ink over time. When applying, wipe off the gel around the fiber with 90° alcohol without discoloration
18	When welding is performed, the primary shell can be easily separated from the fiber without using chemicals and without affecting the fiber.

4. Physical, mechanical and environmental properties

1	Fiber Attenuation Coefficient (Attenuation Coefficent)	≤ 0,35 dB/km ≤ 0,36 dB/km ≤ 0,21 dB/km ≤ 0,22 dB/km	IEC 60793-1-40
2	Dispersion coefficient	≤ 3,5 ps/nm×km ≤ 18 ps/nm×km	IEC 60793-1-42
3	Polarization Mode Dispersion (PMD)	≤ 0,2 ps/	IEC 60793-1-48
4	Wavelength with zero dispersion (λ₀min – λ₀max)	1300nm ≤ λ₀ ≤ 1324nm	IEC 60793-1-42
5	Zere dispersion slope – S₀max	≤ 0,092 ps/nm²×km	IEC 60793-1-40
6	Cut–off wavelength λcc(Cut–off wavelength)	≤ 1260nm	IEC 60793-1-44
7	Loss when bending optical fiber at wavelength 1625nm (Marcro bending loss) with radius r = 30mm × 100 turns	≤ 0,1 dB	IEC 60793-1-47
8	MFD (Mode Field Diameter) mode field diameter at wavelength 1310nm	9,2µm ± 0,5µm	IEC 60793-1-45
9	Core concentricity error	≤ 0,6µm	IEC 60793-1-20
10	Cladding diameter	125µm ± 1,0µm	IEC 60793-1-20
11	Cladding noncircularity	≤ 1 %	IEC 60793-1-20
12	Primary coating diameter	245µm ± 10µm 250µm ± 10µm	IEC 60793-1-21
13	Point Discontinuity increases dramatically at wavelengths 1310nm and 1550nm (Point Discontinuity)	≤ 0,05dB	IEC 60793-1-40
14	Fiber tension	≥ 0,69Gpa (100kpsi)	IEC 60793-1-30
15	Fiber color code	According to EIA/TIA-598
16	The primary shell uses a material that resists the effects of ultraviolet rays (acrylate), minimizing the impact of the external environment.
17	The primary shell before dyeing has a nominal diameter of 245µm ± 10µm, after dyeing it has a nominal diameter of 250µm ± 10µm using a durable ink over time. When applying, wipe off the gel around the fibers with 90° alcohol without discoloration
18	When welding is performed, the primary shell can be easily separated from the fiber without using chemicals and without affecting the fiber.

5. Mechanical properties and cable installation environment:

TT	Targets	Test methods and standards
1	Ability to withstand tension	IEC 60794-1-2-E1	Roller diameter: ≥ 30D (D = Cable diameter)\nLength of test pulling cable section is ≤ 100m\nTest pulling time is maintained for 10 minutes\nContinuous test load:\n+ Corresponding to the weight of 1km of cable × 1 .2 for metal cable car\n+ Corresponding to the weight of 1km of cable × 1.5 for non-metal cable car
		Result	Fibers are not broken, cable sheath is not cracked.\nIncreased attenuation: ≤ 0.1 dB, elongation ≤ 0.25%
2	Compression resistance	IEC 60794-1-2-E3	Compress the cable between two steel plates, one fixed and one movable 10cm long. The radius of the edge of the mobile steel plate is about 5mm\nRepresentative sample with enough length to install on the machine.\nTest force: corresponding to the weight of 1 km of cable in 10 minutes.\nNumber of test points: 1 point.
		Result	Fibers are not broken, cable sheath is not cracked.\nIncreased attenuation: £ 0.1 dB\nCompression cracks do not pose a danger to cable components.
5.3	shock resist ability	IEC 60794-1-2-E4	Hammer height: 100 cm; Hammer weight: 1.0 kg\nHammer head diameter: 25 mm\nNumber of test points: 25 points (10 cm apart)
		Result	The fiber is not broken, the cable cover is not cracked. Impact traces are considered normal.\nAttenuation gain: £ 0.1 dB
5.4	Ability to withstand bending	IEC 60794-1-2-E6 (hoặc E11)	Bending shaft diameter: ≤ 20D (D = cable diameter)\nBending angle: ± 90°; Speed: 2s/time; Load: 10kg; Number of cycles: 25 cycles
		Result	The fiber is not broken, the cable cover is not cracked.\nIncreased loss: ≤ 0.1 dB."
5.5	Torsion resistance	IEC 60794-1-2-E7	Twist test length: 4m; Number of cycles: 10 cycles.\nHelix angle: ± 180°; Axial load 100N.
		Result	– Fiber is not broken, cable sheath is not cracked.\nIncreased loss: ≤ 0.1 dB;
5.6	Heat resistance	IEC 60794-1-2-F1	Thermal cycle: +23°C ® -30°C ® +65°C ® +23°C\nTest sample length: ≥ 500m\nTest time at each thermal cycle is 24h\nEach specific thermal cycle is as follows following:\n– The starting and ending points are room temperature: 23°C\n– Time from +23°C to -30°C is 3 hours\n– Holding at -30°C is 6 hours \n– Increase from -30°C to +65°C in 6 hours\n– Hold at +65°C in 6 hours\n– Decrease temperature from +65°C to +23°C in 3 hours
		Result	Attenuation gain: < 0.05 dB/km
5.7	Test the flow of the filling compound	IEC 60794-1-2-E14	Test sample length: 0.3 m, one end has the cable sheathed approximately 80mm and hung upside down in the test chamber, the upper end is covered\nTest time: 24 hours;\nTest temperature: 60°C ± 5°C
		Result	The filler in the test sample does not flow or fall out or the contents of the filler leak out < 0.05g.\nThe optical fibers in the loose tube stay in place and do not fall.
5.8	Waterproof ability	IEC 60794-1-2-F5	Sample length: 3m; Water column height: 1m\nTest time: 24 hours at 25 ± 2°C
		Result	Water does not penetrate through the test sample
5.9	Ability to withstand discharge voltage	TCN 68-160:1998	Minimum voltage is 20 kVDC or 10 kVACrms with frequency 50~60Hz for 5 minutes
		Result	The cable cover is not punctured

6. Physical, electromechanical and environmental characteristics of subscriber wires

TT	Specifications	Targets
1	Maximum allowable range	100m
2	Maximum allowable load during installation	2.700N
3	Maximum allowable load when working	900N
4	Temperature range when installed	-5°C ~ +65°C
5	Working temperature range	-10°C ~ +65°C
6	Minimum bend radius when installed	10 times the cable diameter
7	Minimum bend radius after installation	20 times the cable diameter

8. Packing and marking

a.Mark and length of subscriber wire

The subscriber line information is marked at each meter length according to IEEE P1222 standard. Other information is added upon customer request.

10. Đóng gói

Standard length: 4000 m for 48FO cable; 3000 m for 96FO cable

The cable is wound into a wooden cable drum (2 layers for 48FO cable, 3 layers for 96FO cable), each cable segment is placed in a separate cable drum. The diameter of the cable reel (cable drum) is 40 times larger than the cable outer diameter and ensures protection against damage during transportation and loading. Cable drums are single-use.

After completing the test, the two ends of the cable roll are sealed to make it waterproof.

The cable drum cover is made of wooden spokes attached to the cable drum rim with nails and has a protective iron belt.

Manufacturer name: RECOIN

Cable type: FTTx-LT-F8 subscriber line

Number of optical fibers: 1F0/2F0/4F0

Customer name: VNPT

Cable length: 3000m

Date of manufacture: ..............

Test day: ..............

Cable weight: ............kg

Weight of bobbin: ...........kg

Arrows indicate the cable exit direction on both sides of the bobbin

KCS test mark when shipped: includes information on the dB/km loss coefficient of each optical fiber at wavelengths of 1310nm and 1550nm at both ends of the cable.