The structure of the standard figure-eight self-supporting central tube optical cable is that single-mode or multi-mode optical fibers are 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 the loose tube. The loose tube is coated with plastic (wrinkle) steel tape longitudinally. The water blocking tape between the steel tape and the loose tube ensures the compactness of the optical cable and the longitudinal water blocking and is placed parallel to the steel strand. Simultaneously squeeze the figure 8 sheath into a cable.
Color:
Description
Technical data
| No. of cable | 2~8 | 10~12 | 14~24 | ||
| Fiber Model | G.652D | ||||
| Loose Tube | Material | PBT | |||
| Diameter（±0.06）mm | 2.0 | 2.4 | 2.8 | ||
| Thickness（±0.03）mm | 0.32 | 0.35 | 0.4 | ||
| Max.Core NO./Tube | 2~8 | 10~12 | 14~24 | ||
| Water Blocking layer（Material） | Water Blocking Tape | ||||
| Armoring | Material | Steel Tape | |||
| Thickness（±0.03）mm | 0.25 | ||||
| Messenger Wire | Material | Galvanized steel strand | |||
| Size（±0.05）mm | 2.7mm（0.9×7） | ||||
| Web | Material | MDPE | |||
| Size（±0.1）mm | 2.0×3.0 | ||||
| Outer Sheath① | Material | MDPE | |||
| Thickness（±0.1）mm | 1.5 | ||||
| Outer Sheath② | Material | MDPE | |||
| Thickness（±0.1）mm | 1.7 | 1.8 | 1.8 | ||
| Cable Diameter（±0.5）mm | 7.2×15.4 | 7.6×15.8 | 8.0×16.2 | ||
| Cable Wetght（±10）kg | 110 | 115 | 125 | ||
| Min. bending radius | Without Tension | 10.0×Cable-φ | |||
| Under Maximum Tension | 20.0×Cable-φ | ||||
| Temperature range （℃） |
Installation | -20~+60 | |||
| Transport&Storage | -40~+70 | ||||
| Operation | -40~+70 | ||||
Fiber Color
| No. | 1 | 2 | 3 | 4 | 5 | 6 |
| Color |  |
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| No. | 7 | 8 | 9 | 10 | 11 | 12 |
| Color |  |
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| No. | 13 | 14 | 15 | 16 | 17 | 18 |
| Color |  |
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| No. | 19 | 20 | 21 | 22 | 23 | 24 |
| Color |  |
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The properties of single-mode optical fiber (ITU-T Rec. G.652.D)
| Item | Specification |
| Fiber type | Single-mode |
| Fiber material | Doped silica |
| Attenuation coefficient @ 1310 nm @ 1383 nm @ 1550 nm @ 1625 nm |
£ 0.36 dB/km £ 0.32 dB/km £ 0.22 dB/km £ 0.30 dB/km |
| Point discontinuity | £ 0.05 dB |
| Cable cut-off wavelength | £ 1260 nm |
| Zero-dispersion wavelength | 1300 ~ 1324 nm |
| Zero-dispersion slope | £ 0.092 ps/(nm2.km) |
| Chromatic dispersion @ 1288 ~ 1339 nm @ 1271 ~ 1360 nm @ 1550 nm @ 1625 nm |
£3.5 ps/(nm. km) £5.3 ps/(nm. km) £18 ps/(nm. km) £22 ps/(nm. km) |
| PMDQ (Quadrature average*) | £0.2 ps/km1/2 |
| Mode field diameter @ 1310 nm | 9.2±0.4 um |
| Core / Clad concentricity error | £ 0.5 um |
| Cladding diameter | 125.0 ± 0.7 um |
| Cladding non-circularity | £1.0% |
| Primary coating diameter | 245 ± 10 um |
| Proof test level | 100 kpsi (=0.69 Gpa), 1% |
| Temperature dependence 0oC~ +70oC @ 1310 & 1550nm |
£ 0.1 dB/km |
Application:
| NO. | Item | Requirement | |
| 1 | Tensile Rating | Cable installation w/o Messenger | 2700N |
| CableResidual w/o Messenger | 800 N | ||
| 2 | Crush Resistance | Short Term | 1000 (/100mm) |
| Long Term | 300 (/100mm) | ||
Sheath marking
The color of marking is white, but if the remarking is necessary, the white color marking shall be printed newly in a different position.
An occasional unclear of length marking is permitted if both of the neighboring markings are clear.
Both cable ends are sealed with heat shrinkable end caps to prevent water ingress.
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