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Production » Outdoor cables » Cables for installation in cable ducts, tubes, tunnels » OKL cable

OKL cable

Fiber –optic cable OKL armoured by corrugated steel tape for installation in cable ducts.


OKL cable is designed for installation in cable ducts, tubes, tunnels. OKL with flame retardant jacket 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. Corrugated steel tape armor
  6. Protective jacket
  7. * longitudinal watertightness of the cable is provided by a hydrophobic gel


Loose tube cable. Central strength member made of fiber reinforced plastic (FRP).Polymer tubes and plastic fillers are SZ-stranded around central strength member. Optical fibers are placed inside polymer tubes. Interstice inside and between tubes is filled with hydrophobic filler. Cable core is wrapped by yarns. PET-tape is imposed on the cable core. An armour from a corrugated steel tape is formed around single jacketed cable with outer jacket of high density polyethylene extruded over the armour. Interstice between tape and outer jacket is filled with hydrophobic filler. In case of exclusive standards of fire safety, cable 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. Application of ripcord.
  5. Number of fibers up to 288.


Number of fibers2-2426-4850-9698-144
Number of polymer tubes 6 6 6 6
Number of optical fibers in a tube up to 4 up to 8 up to 16 up to 24
Nominal overall diameter, mm 11,5 12,5 15,5 19,2
Total mass of cable with polyethylene jacket, kg/km 126 148 215 309
Total mass of cable with flame retardant (HF) jacket (kg/km) 154 184 261 367

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 1,5 kN
Crush strength not less than 3 kN/100 mm

Documentation is on request

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