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Direct Buried Cable
Direct Burried Optical Fiber Cable (DBC-ESP) 4-144 Cores
– SPECIFICATION For Single Mode of steel – tape armored
- CABLE CONSTRUCTION
1.1 Cross-sectional Drawing of Cable
1.2 Diameter, Composition and Weigh
Table 1
| No. of Fiber | Nominal
Cable Diameter (mm) |
Approx. Cable Weight
(kg/km) |
Minimum Bending Radius (mm) | |
| Under Load | No Load | |||
| 4-30 | 11.7 | 160.1-164.7 | 234 | 117 |
| 31-60 | 12.8 | 182.5-185.8 | 294 | 150 |
| 61-72 | 13.5 | 203-205.3 | 270 | 135 |
| 73-96 | 15.1 | 248.8-250.9 | 302 | 151 |
| 97-144 | 19.6 | 347.3-352.1 | 400 | 196 |
- 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 240-500kg. # 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 after completion of the test – Attenuation Increment: £ 0.1 dB – 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: 300 mm – No. of impact per point: 1 time – No. of impact points: 3 points (500mm interval) # Acceptance Criteria after completion of the test – Attenuation Increment : £ 0.1 dB – 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 after completion of the test – Attenuation Increment: £ 0.1 dB – 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 after the completion of the test – Attenuation Increment: £ 0.10 dB – 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: 1m -.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. 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. Bend radius before installation | ≥ 20 instalments diameter |
| Min. Bend radius after installation | ≥ 10 instalments diameter |
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