OKB type optical communication cable

Cable with armour made of round steel wires or fibreglass bars designed for laying in soils of all groups, including rocky and subject to permafrost deformations, cable ducts, collectors, bridges, overpasses, river crossings and swamps up to 2 m deep, inside buildings and structures, for aerial suspension (when armoured with GRP bars), in operation from minus 60°? to 70°?.
The outer sheath is made of polymer compositions with consideration of application: at cable entry into the premises from polymer compositions not spreading combustion; in other cases - from polyethylene; round steel wires or fibreglass bars; optical modules twisted around the central power element.
Optical characteristics:
Attenuation coefficient of single-mode optical fibres (core/shell dimensions 9/125) at wavelength 1310 nm not more than 0.36 dB/km, at wavelength 1550 nm not more than 0.22 dB/km.
The attenuation coefficient of multimode o...