1. CABLE
CONSTRUCTION
1.1
Cross-sectional Drawing of Cable
1.2
Diameter, Composition and Weight
Table 1
No. of Fiber | Nominal Cable Diameter (mm) | Approx. Cable Weight (kg/km) | Minimum Bending Radius
(mm) |
Under Load | No Load |
4-30 | 8.7 | 123.2 -127.8 | 196 | 100 |
1. PHYSICAL /
MECHANICAL / ENVIRONMENTAL PERFORMANCE AND TESTS
1.1 Mechanical
and Environmental Performance of the Cable
The mechanical
and environmental performance of the cable shall be in accordance with Table 2
below. Unless otherwise specified, all attenuation measurements required in
this section shall be performed at 1550nm for single mode fiber
Table 2. The Mechanical and Environmental
Performance of the Cable
ITEMS | TEST METHOD AND ACCEPTANCE CRITERIA |
Tensile Strength | # Test method: IEC 60794-1-2 Method E1 - Mandrel diameter: 20D (D = cable diameter) - Length under tension: ³ 50 m - Max tensile load shall be 185 # Acceptance Criteria - Attenuation increment: £ 0.1 dB - No jacket cracking
and fiber breakage - Graph of elongation(cable and fiber) to the
applied load shall be submitted. |
Compression Test | # Test method: IEC 60794-1-2 Method E3 - Applied load: 1100
N/50 mm - No of points: 1 point # Acceptance Criteria - Attenuation Increment: £ 0.1 dB after completion of the test - No jacket cracking
and fiber breakage |
Impact resistance | # Test method: IEC 60794-1 Method E4 - Height of impact: 1 m - Drop hammer mass: 2
kg - Radius impact
surface: 25 mm - No. of impact per
point: 1 time - No. of impact points:
10 points (100mm interval) # Acceptance Criteria - Attenuation Increment : £ 0.1 dB after completion of the test - No jacket cracking
and fiber breakage |
Repeated Bending | # Test method: IEC 60794-1-2 Method E6 - Sheave diameter: 15D (D = cable diameter) - Flexing speed: Minimum 12 cycles/minute - Applied mass: 3kg - No. of flexing cycles: 50 cycles # Acceptance Criteria - Attenuation Increment: £ 0.1 dB after completion of the test - No jacket cracking and fiber breakage |
Table 2. The Mechanical
and Environmental Performance of the Cable (Continued)
ITEMS | TEST METHOD AND ACCEPTANCE CRITERIA |
Twisted Test | # Test method: IEC 60794-1-2-E7 - Cable length twisted: 2m - No. of twist cycles: 10 cycles - Twist angle: ± 180° # Acceptance Criteria - Attenuation Increment: £ 0.10 dB After the completion of the test - No jacket cracking and fiber breakage |
Temperature Cycling | # Test method: IEC 60794-1-2 Method F1 - Cable length: at least 500m - At least 6 fibers shall be spliced and
tested. - Temperature cycling schedule : 23°C ® -30°C ® 70°C ® -30°C ® 70°C - Soak time at each temperature: 24 hours # Acceptance Criteria - Attenuation increment: £ 0.1 dB/km |
Compound Flow (Drip) | # Test method: IEC 60794-1- Method E14 - Length of specimen: 0.3m * Outer jacket and corrugated steel tape shall
be removed before testing. - Test time: 24 hours - Test temperature: 60°C # Acceptance Criteria - No compound driped from LT - No fibers moved |
Water Penetration | # Test method: IEC 60794-1-2 Method F5 - Length of specimen: 3m * Outer jacket and corrugated steel tape shall
be removed before testing. - Height of pressure head: 3m - Test time: 24 hours # Acceptance Criteria - No leakage through the open cable end |
1.2 Physical Performance of the Cable
Table 3- Physical Performance of the Cable
ITEMS | SPECIFICATION |
Skin Type | HDPE |
Max. Span | 100m |
Max. loading capacity (installation) | ≤ 3.5kN |
Max. loading capacity (working) | ≤ 2.5kN |
Compression resitance | 2000N/10cm |
Temprature Elongation | < 8.2 x 106/0C |
Temperature range | -50C - 700C |
Hummidity range | 1 - 100% |
Max. Electric intensity | 35 kv |
Max. Bend radius before installation | ≥ 20 instalments
diameter |
Min. Bend radius after installation | ≥ 10 instalments
diameter |
Max.Sag down(wind pressure 95daN/m2) | 1.5% |