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General characteristics of optical fibre cables

Optical fiber cables general characteristics

Optical fiber cables typically consist of individual optical fibers (formed into ribbons or bundles), central core of multi-module or central tube construction, several layers of armoring and protective sheathing, depending on the application are added to form the cable.
Outdoor cables contain hydrophobic gel and water-blocking elements (threads, ribbons and so on.) ensuring filling of voids in the protective sheathing and inter-module space.

Outer sheathing of Indoor cables and cables for tunnels and collectors is flame-retardant. All kinds of indoor cables have the flame-retardant outer sheathing. The absence of hydrophobic fillers, lower operating temperature range and limited mechanical and environmental protection are the main differences from the outdoor cables.

Operating temperature range:

– Outdoor cables for direct burial

— from minus 40 to + 50°С;

–Outdoor cables installed on the bridges and overpasses

— from minus 50 to + 50°С;

– Outdoor aer ial cables

— from minus 60 to + 70°С;

–Indoor cables

— from minus 10 to + 50°С.

 

Ambient temperature during transportation and storage:

 

– Outdoor cables for direct burial

— from minus 50 to + 50°С;

– Outdoor aerial cables

— from minus 50 to + 50°С;

– Indoor cables

— from minus 10 to + 50°С.

 

Minimal optical fiber cables installation temperature is minus 10°С (cable temp.).

Electrical characteristics:


Electrical isolation resistance value “steel members of the structure– ground (water)” is more than 2000 Mom x km..
Circuit isolation “steel members of the structure – ground (water)” can withstand 20 kV DC voltage either 10 kV AC voltage with 50 Hz frequency during 5 seconds.
Optical fiber cables withstand spread of pulse current of 105 kA (60 mkc).
Outer jacket of the cables for outdoor installation is UV resistant.
Minimum bending radius – 20 external diameters of the cable.
The warranty for optical fiber cables – 2 years from the installation date either 3 years from the shipment date.
The technical lifetime of optical fiber cables including storage time exceeds 25 years, subject to the conditions described in the technical specifications.