OUTDOOR AERIAL FIBER OPTIC CABLE
---FIG.8 SELF-SUPPORTING CABLE
1. Scope
This technical specification states the structure, mechanical, physical performance and optical
fiber requirements for
fiber optic cable used in telecommunication.
2. Standard
Unless otherwise specified in this specification, all requirements shall be mainly in accordance
with the following standard specifications.
• International Telecommunications Union (ITU-T)
G.650 Definition and Test Methods for the Relevant Parameters of Single-Mode Fibers
G.652 Characteristics of a Zero Dispersion Non-Shifted Single-Mode Optical Fiber Cable
G.655 Characteristics of a Non-Zero Dispersion Shifted Single-Mode Optical Fiber Cable
• International Electrotechnical Commission
IEC 60794-1-1 Optical Fiber Cables, Part 1, Generic Specifications-General
IEC 60794-1-2 Optical Fiber Cables, Part 2, Generic Specifications-Basic optical cable test
procedures
3. Optical Fiber
3.1 General of optical fibers
Unless otherwise specified in this specification, all requirements for optical fiber shall be mainly
in accordance with ITU-T G.652 D standards.
The optical fiber core, with a higher refractive index compared to the cladding, is made of SiO2
(Silicon dioxide) doped with GeO2 (Germanium dioxide). The cladding of
the optical fiber is
made of SiO2. The primary coating is made of an UV-curable acrylate. This make-up protects
the fiber against micro-bending losses and against abrasion.
3.2 Technical parameter of ITU-T G.652 (B1. 3) single-mode optical fiber
Parameter |
Condition |
Specified Value |
Unit |
Optical Characteristics |
Mode Field Diameter (MFD) |
1310nm
1550nm |
9.2±0.4
10.4±0.8 |
µm
µm |
Cut-off Wavelength (λcc) |
|
≤1260 |
nm |
Attenuation Coefficient |
1310nm
1383nm
1550nm |
≤0.35
≤0.34
≤0.22 |
dB/km
dB/km
dB/km |
Macro Bending Loss |
Ф75mm, 100 circles,
at 1550nm |
≤0. 05 |
dB |
Attenuation Non-uniformity |
|
≤0.05 |
dB |
Dispersion Coefficient |
1288~1339nm
1271~1360nm
1550nm |
≤3.5
≤5.3
≤18 |
ps/(nm.km)
ps/(nm.km)
ps/(nm.km) |
Zero Dispersion Wavelength |
|
1300~1324 |
nm |
PMD |
Link value |
≤0. 2 |
ps/km1/2 |
Max Zero Dispersion Slope |
|
≤0.093 |
ps/(nm2.km) |
Group Index of Refraction
(Typical Value) |
1310nm
1550nm |
1.466
1.467 |
|
Geometric Characteristics |
Cladding Diameter |
|
125.0±1.0 |
µm |
Core/Cladding Concentricity Error |
|
≤0.8 |
µm |
Cladding Non-circularity |
|
≤1.0 |
% |
Coating Diameter |
|
245.0±10 |
µm |
Cladding/Coating Concentricity Error |
|
≤12.0 |
µm |
Coating Non-circularity |
|
≤8 |
% |
Diameter of Colored Coating |
|
250.0±15 |
µm |
Mechanical Characteristics |
Curling (Radius) |
|
≥4 |
m |
Proof Stress |
|
≥0.69 |
Gpa |
Coating Strip Force |
Average value
Peak value |
1.0-5.0
1.3-8.9 |
N
N |
Dynamic Stress Corrosion
Susceptibility Parameter (nd Value) |
|
≥20 |
|
4. Optical Fiber Cable
4.1 Cable structure: Fig.8 aerial cable structure (Type: GYFTC8Y-10B1)
- G.652 D fibers
- Central non-metallic strength element
- Loose tubes SZ-stranded
- Cable filling compound
- Self-supporting by stranded steel wire
- MDPE outer sheath
Suitable for: self-supporting aerial installation
4.2 Manufacture process
Coloring of fiber
At first, the fibers should be colored different colors for identification in loose tube.
Loose tube technique
The material of loose tube is PBT(Polybutylene terephthalate). Each loose tube contains fibers,
which are loosely lying in the tube. The tube is filled with a non-hygroscope, non-toxic,
homogenous gel in order to prevent water penetration.
Reverse lay (SZ) stranding cable core
The loose tubes are stranded around the central strength member according to the reverse lay
method, which means
that the direction of stranding will reverse every several stranding pitch.
Polyeste binder is enlaced around
the tube in order to retain them in the proper position.
Cable sheath
Fig.8 self-supporting aerial cable: The outer MDPE is extruded on cable core and stranded steel
wires, the cable outer shape is figure "8".
Sheath shall contain Carbon Black for ultraviolet light protection and shall not promote the
growth of
fungus and shall be free of holes, splits and blisters.
4.3 Fiber and loose tube color code
Fiber color code:
No. |
Color |
NO. |
Color |
NO. |
Color |
NO. |
Color |
1 |
BL- Blue |
 |
2 |
OR- Orange |
 |
3 |
GR- Green |
 |
4 |
BR- Brown |
 |
5 |
GY- Grey |
 |
6 |
WH- White |
 |
7 |
RE- Red |
 |
8 |
BK- Black |
 |
9 |
YE- Yellow |
 |
10 |
PU- Purple |
 |
11 |
PI- Pink |
 |
12 |
AQ- Aqua |
 |
Loose tube color code:
No. |
Color |
NO. |
Color |
NO. |
Color |
NO. |
Color |
1 |
BL- Blue |
|
2 |
OR- Orange |
|
3 |
GR- Green |
|
4 |
BR- Brown |
|
5 |
GY- Grey |
|
6 |
WH- White |
|
7 |
RE- Red |
|
8 |
BK- Black |
|
9 |
YE- Yellow |
|
10 |
PU- Purple |
|
11 |
PI- Pink |
|
12 |
AQ- Aqua |
|
Color-coding of fiber and tube will be clear, and not fade and move in temperature of
working
and installation.
4.4 Fig.8 self-supporting cable
4.4.1 Mechanical and physical parameter of the cable
Item |
Description |
Tensile Strength |
Ultimate Tension Strength (UTS) |
12000N |
Max Working Strength |
8000N |
Crush Resistance |
During Installation |
2000N/100mm |
| During Operation |
800N/100mm |
Temperature Range |
During Installation |
－10～＋50℃ |
| During Operation |
－40～＋70℃ |
Minimum Bending Radius |
During Installation |
20 times of cable diameter |
| During Operation |
10 times of cable diameter |
4.4.2 The section of the cable
4.5 Construction of Fig.8 self-supporting cable
Fig.8 self-supporting cable (Type: GYFTC8Y-10B1)
Item |
Description |
Approx. Cable Diameter |
8.6mm |
Approx. Stranded Steel Wire Sheath Outer Diameter |
5.5mm |
Approx. Cable Weight |
185kg/km |
Messenger Wire |
Material |
Galvanization zinc stranded steel
wires (YB/T 098-1997 Standard) |
Diameter×No.s |
1.3mm×7 |
Central Tensile Element |
Material |
Non-metallic strength element(FRP) |
Diameter |
1.6 mm |
Optical Fiber |
Type |
ITU-T G.652D fibers |
Number |
4~144 |
Tube Filling |
Material |
Tube filling compound |
Loose Tube |
Material |
PBT (Polybutylene terephthalate) |
Outer Diameter |
1.9 mm |
Number |
2~12 |
Cable Filling |
Material |
Cable filling compound |
PE Sheath 1 |
Material |
MDPE with black-carbon |
Thickness |
Nominal: 1.0; Minimum: 0.8mm |
PE Sheath 2 |
Material |
MDPE with black-carbon |
Thickness |
Nominal: 1.8; Minimum: 1.6 mm |
5. Testing Requirements
5.1 Mechanic performance:
Table-1
Item |
Requirement |
Tension |
Test Standard |
IEC 60794-1-2-E1 |
Length of Cable Under Load |
Not less than 50 meters |
Diameter of Mandrel |
Not more than 30x outside diameter of cable |
Load |
See 5.4 Technical parameter of cable |
Load Time |
1 minute |
Tension Rate |
10mm/min |
Test Result |
Additional attenuation: <0.1dB |
No fiber break and no sheath damage |
Impact
Resistance |
Test Standard |
IEC 60794-1-2-E4 |
Pre-Requirement |
Fig.8 self-supporting cable, the messenger wire
shall be removed prior testing |
Impact Energy |
4.4N·m |
Radius of Hammer |
12.5mm |
Length of Cable Under Test |
Not less than 50mm |
Number of Impacts |
Not less than 25 times |
Impact Rate |
Not more than 2 sec/cycle |
Test Result |
Additional attenuation: <0.1dB |
No fiber break and no sheath damage |
Crush |
Test Standard |
IEC 60794-1-2-E3 |
Pre-Requirement |
Fig.8 self-supporting cable, the messenger wire
shall be removed prior testing |
Load |
See 5.4 Technical parameter of cable |
Load Time |
10 min. |
Test Result |
Additional attenuation: <0.1dB |
No fiber break and no sheath damage |
Repeat
Bending |
Test Standard |
IEC 60794-1-2-E8 |
Diameter of Mandrel |
20x out side diameter of cable |
Load |
50N |
Number of Cycles |
Not less than 25 cycles |
Flexing Rate |
Not more than 2 sec/cycle |
Test Result |
Additional attenuation: <0.1dB |
No fiber break and no sheath damage |
Twist |
Test Standard |
IEC 60794-1-2-E7 |
Twist Rate |
Not more than 1min/cycle |
Twist Angle |
±180º |
Number of Cycles |
10 cycles |
Load |
50N |
Test Result |
Additional attenuation: <0.1dB |
No fiber break and no sheath damage |
Cable
Bending |
Test Standard |
IEC 60794-1-2-E11B |
Diameter of Mandrel |
20x out side diameter of cable |
Number of Cycles |
3 |
Test Result |
Additional attenuation: <0.1dB |
No fiber break and no sheath damage |
5.2 Environment performance:
Table-2
Item |
Requirement |
Temperature Cycling |
Testing Method |
IEC 6094-1-2-F1 |
Variation of Temperature |
-40~+60℃ |
Number of Cycles |
2 |
Soak Time |
12 hours |
Test Result |
Additional attenuation: <0.1dB |
No fiber break and no sheath damage |
Water Penetration |
Testing Method |
IEC 60794-1-2-F5 |
Height of Water Column |
1 meter |
Test Time |
24 hours |
Sample Length |
3 meters |
Test Result |
At the end of 1 hour, no water leaks from
the opposite end of the cable |
Compound Drip |
Testing Method |
IEC 60794-1-2-E14 |
Temperature |
+70℃ |
Sample Length |
30cm |
Soak Time |
24 hours |
Test Result |
Weightiness of the cable specimens is
decreased less than or equal to 0.005g. |
6. Cable Marking
Sheath mark
Unless otherwise required the sheath will be marked at intervals of 1m, containing:
(a) Indication in meters
(b) Quantity and type of fibers
(c) Factory name
(d) Date of manufacturing (year)
(e) Other requirements
The marks will be permanent and legible for the duration of the cable life.
The precision of the length indication will be better than 1000m±2m.
7. Delivery Requirementsss
Normal cable factory length: 2000m to 6000m or other required.
All cables will be delivered on drums with protection of both ends of the cable. Each drum have
a waterproof mark, with clear factory name, date, cable type,
cable length in unit gross
weight, cable outer diameter, cable weight and so on and will be provided the length of all
fibers in each drum.
