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Production » Outdoor cables » Cables for direct burial installation » OKP cable

OKP cable

Fiber-optic cable OKP for direct burial installation, reinforced with FRP rods.


Cable is designed for installation in grounds of 1-5 groups (it depends on a construction), ducts, tubes, tunnels in case of high requirements of crush strength and stability to external electromagnetic action. OKP from flame retardant materials is designed for installation according to exclusive standards of fire safety.

  1. Central strength member – fiberglass reinforced plastic rod
  2. Optical fiber
  3. SZ stranded loose tubes filled with hydrophobic gel
  4. Inner jacket
  5. Fiberglass rods armor
  6. Protective jacket
  7. * longitudinal watertightness of the cable is provided by a hydrophobic gel


Loose tube cable. Central strength member is made of fiber reinforced plastic (FRP). Polymer tubes and plastic fillers are SZ-stranded around central strength member. Optical fibers are placed inside loose optical modules. Interstice inside modules and between modules is filled with hydrophobic filler. Cable core is wrapped by aramid yarns. PET-tape is imposed on the cable core. PE – jacket is extruded over the core. An armour from FRP rods is formed around single jacketed cable with jacket of high density polyethylene extruded over the armour. In case of exclusive standards of fire safety outer jacket is made of flame retardant halogen free (HF) compound.

On customer’s request cable design can have following options:

  1. Production of «dry» construction (water blocking yarns instead of hydrophobic filler).
  2. Selection of flame retardant material of outer jacket (halogen-free HF compound or self-extinguishing PE).
  3. Change of the standard color of polymer modules and fibers.
  4. Number of fibers up to 288.


Number of fibers2-3234-4850-9698-144
Number of polymer tubes 6 6 6 6
Number of optical fibers in a tube up to 6 up to 8 up to 16 up to 24
Nominal overall diameter, mm 12,2 12,9 17,2 19,7
Total mass of cable with polyethylene jacket, kg/km 131 147 275 354
Total mass of cable with flame retardant (HF) jacket (kg/km) 166 184 326 414

Operational requirements:

Temperature range of operation, С° -60… +70
Temperature range of installation, С° -10… +50
Transport, storage, С° -50… +50
Minimal bending radius not less than 20 diameters
Lifetime 25 years
Guarantee exploitation 2 years after putting in operation, not more than 2,5 years from shipping date
Tensile strength not less than 3 kN
Crush strength not less than 4 kN/100 mm

Documentation is on request

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