OTD-laying setcomprising blowing-in unit, blowing head, air valve, blowing-in piston, cleaning set, laying table, hose fittings, tube and cable guide sealing cable oiler unit. Cable laying set and OTD-compressed-air blowing-in unit type OTD 70:cable guidance and feeding force via a continuous soft trapezoidal toothed belt with 3 supported guide rollers.