FIELD: radio engineering, communication.
SUBSTANCE: fibre-optic communication line containing microcables placed in the pipe of underground cable-conduit line, wherein the microcables are pulled inside the microtubes which are grouped into one or several packets. The microtubes are made of high-density polyethylene with the use of an additional means for reducing sliding friction, while longitudinal grooves on the inner surface of the microtubes are used as an additional means for reducing sliding friction, with the formation of protuberances, wherein the depth of the longitudinal grooves is chosen according to the condition: h = (0.05…0.2)δw, where: h is the depth of the longitudinal grooves, δw is the thickness of the microtube wall, while the thickness of the microtube wall is chosen according to the condition: δst = (0.17…0.28) dmc, where dmc is the internal diameter of the microtube.
EFFECT: reduced friction between the microtubes and the pipe walls of the underground cable-conduit line and between the microtubes and the fibre-optic microcables, and between the microtube packets and the pipe of the underground cable-conduit line.
4 cl, 35 dwg, 4 tbl
