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The structure underground duct GTYA fiber optic cable is that the single-mode optical fiber is sheathed in a loose tube made of high modulus plastic, and the tube is filled with a water blocking compound. The center of the cable core is a metal steel wire as central strength member to make the fiber high with higher tensile force. A layer of polyethylene needs to be extruded outside the metal reinforced core, and the loose tube (and filler rope) is twisted around the central reinforced core to form a compact and circular cable core, the gaps in the cable core are filled with water blocking fillers.
Dimensions of Cable Constructions
Fiber count | Structure | Fibers per tube | Loose tube diameter (mm) | CSM diameter/pad diameter (mm) | Nominal Thickness of outer jacket (mm) | Cable diameter/ Height (mm) | Cable weight (kg/km) |
4 | 1+5 | 4 | 1.8±0.1 | 1.4/1.4 | 1.4 | 8.5±0.3 | 75 |
6 | 1+5 | 6 | 1.85±0.1 | 1.4/1.4 | 1.4 | 8.5±0.3 | 75 |
8 | 1+5 | 8 | 1.9±0.1 | 1.4/1.4 | 1.4 | 8.5±0.3 | 75 |
12 | 1+5 | 6 | 1.9±0.1 | 1.4/1.4 | 1.4 | 8.5±0.3 | 75 |
24 | 1+5 | 6 | 1.9±0.1 | 1.4/1.4 | 1.4 | 8.5±0.3 | 75 |
36 | 1+6 | 12 | 1.95±0.1 | 1.5/1.5 | 1.6 | 8.8±0.3 | 85 |
48 | 1+5 | 12 | 1.95±0.1 | 1.5/1.5 | 1.6 | 9.3±0.3 | 90 |
60 | 1+5 | 12 | 1.95±0.1 | 1.6/1.6 | 1.6 | 9.3±0.3 | 90 |
72 | 1+6 | 12 | 1.95±0.1 | 2.0/2.0 | 1.6 | 9.6±0.3 | 95 |
96 | 1+8 | 12 | 1.95±0.1 | 1.4/3.2 | 1.6 | 11.5±0.3 | 120 |
144 | 1+12 | 12 | 1.95±0.1 | 2.0/5.7 | 1.8 | 14.2±0.3 | 185 |
216 | 1+6+12 | 12 | 1.95±0.1 | 2.0/2.0 | 1.8 | 14.5±0.3 | 200 |
288 | 1+9+15 | 12 | 1.95±0.1 | 2.0/3.7 | 1.8 | 16.2±0.3 | 240 |